// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

// types
import { Pool } from "./Pool.sol";
import { AssetData, DebtData } from "./PositionManager.sol";
import { Registry } from "./Registry.sol";
import { RiskModule } from "./RiskModule.sol";
import { IOracle } from "./interfaces/IOracle.sol";

// contracts
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/// @title RiskEngine
contract RiskEngine is Ownable {
    /// @notice Timelock delay to update asset LTVs
    uint256 public constant TIMELOCK_DURATION = 24 * 60 * 60; // 24 hours
    /// @notice Timelock deadline to enforce timely updates
    uint256 public constant TIMELOCK_DEADLINE = 3 * 24 * 60 * 60; // 72 hours
    /// @notice Sentiment Pool registry key hash
    /// @dev keccak(SENTIMENT_POOL_KEY)
    bytes32 public constant SENTIMENT_POOL_KEY = 0x1a99cbf6006db18a0e08427ff11db78f3ea1054bc5b9d48122aae8d206c09728;
    /// @notice Sentiment Risk Module registry key hash
    /// @dev keccak(SENTIMENT_RISK_MODULE_KEY)
    bytes32 public constant SENTIMENT_RISK_MODULE_KEY =
        0x881469d14b8443f6c918bdd0a641e9d7cae2592dc28a4f922a2c4d7ca3d19c77;

    /// @title LtvUpdate
    /// @notice Utility struct to store pending Pool LTV updates
    struct LtvUpdate {
        uint256 ltv;
        uint256 validAfter;
    }

    // Protocol LTV configs:
    // - pool owners are free to configure a different LTV for every asset on their pool
    // - however these custom LTVs must fall within the global protocol limits
    // - the global LTV limits can only be modified by the protocol owner
    // - ltv updates will revert if they fall outside of the protocol bounds

    /// @notice Minimum LTV bound
    uint256 public minLtv;
    /// @notice Maximum LTV bound
    uint256 public maxLtv;

    /// @notice Sentiment Registry
    Registry public registry;
    /// @notice Sentiment Singleton Pool
    Pool public pool;
    /// @notice Sentiment Risk Module
    RiskModule public riskModule;

    /// @dev Asset to Oracle mapping
    mapping(address asset => address oracle) public oracleFor;
    /// @notice Fetch the ltv for a given asset in a pool
    mapping(uint256 poolId => mapping(address asset => uint256 ltv)) public ltvFor;
    /// @notice Fetch pending LTV update details for a given pool and asset pair, if any
    mapping(uint256 poolId => mapping(address asset => LtvUpdate ltvUpdate)) public ltvUpdateFor;
    /// @notice Check if poolA lends to positions that also borrow from poolB
    mapping(uint256 poolA => mapping(uint256 poolB => bool isAllowed)) public isAllowedPair;

    /// @notice Pool address was updated
    event PoolSet(address pool);
    /// @notice Registry address was updated
    event RegistrySet(address registry);
    /// @notice Risk Module address was updated
    event RiskModuleSet(address riskModule);
    /// @notice Protocol LTV bounds were updated
    event LtvBoundsSet(uint256 minLtv, uint256 maxLtv);
    /// @notice Oracle associated with an asset was updated
    event OracleSet(address indexed asset, address oracle);
    /// @notice Pending LTV update was rejected
    event LtvUpdateRejected(uint256 indexed poolId, address indexed asset);
    /// @notice Pending LTV update was accepted
    event LtvUpdateAccepted(uint256 indexed poolId, address indexed asset, uint256 ltv);
    /// @notice LTV update was requested
    event LtvUpdateRequested(uint256 indexed poolId, address indexed asset, LtvUpdate ltvUpdate);
    /// @notice Allowed base pool pair toggled
    event PoolPairToggled(uint256 indexed poolA, uint256 indexed poolB, bool isAllowed);

    /// @notice There is no oracle associated with the given asset
    error RiskEngine_NoOracleFound(address asset);
    /// @notice Proposed LTV is outside of protocol LTV bounds
    error RiskEngine_LtvLimitBreached(uint256 ltv);
    /// @notice There is no pending LTV update for the given Pool-Asset pair
    error RiskEngine_NoLtvUpdate(uint256 poolId, address asset);
    /// @notice Function access is restricted to the owner of the pool
    error RiskEngine_OnlyPoolOwner(uint256 poolId, address sender);
    /// @notice Timelock delay for the pending LTV update has not been completed
    error RiskEngine_LtvUpdateTimelocked(uint256 poolId, address asset);
    /// @notice Timelock deadline for LTV update has passed
    error RiskEngine_LtvUpdateExpired(uint256 poolId, address asset);
    /// @notice Global min ltv cannot be zero
    error RiskEngine_MinLtvTooLow();
    /// @notice Global max ltv must be less than 100%
    error RiskEngine_MaxLtvTooHigh();
    /// @notice Pool LTV for the asset being lent out must be zero
    error RiskEngine_CannotBorrowPoolAsset(uint256 poolId);
    /// @notice Min Ltv is not less than Max Ltv
    error RiskEngine_InvalidLtvLimits(uint256 minLtv, uint256 maxLtv);
    /// @notice Base pool has not been initialized
    error RiskEngine_InvalidBasePool(uint256 poolId);

    /// @param registry_ Sentiment Registry
    /// @param minLtv_ Minimum LTV bound
    /// @param maxLtv_ Maximum LTV bound
    constructor(address registry_, uint256 minLtv_, uint256 maxLtv_) Ownable() {
        if (minLtv_ == 0) revert RiskEngine_MinLtvTooLow();
        if (maxLtv_ >= 1e18) revert RiskEngine_MaxLtvTooHigh();
        if (minLtv_ >= maxLtv_) revert RiskEngine_InvalidLtvLimits(minLtv_, maxLtv_);

        registry = Registry(registry_);
        minLtv = minLtv_;
        maxLtv = maxLtv_;

        emit LtvBoundsSet(minLtv_, maxLtv_);
    }

    /// @notice Fetch and update module addreses from the registry
    function updateFromRegistry() external {
        pool = Pool(registry.addressFor(SENTIMENT_POOL_KEY));
        riskModule = RiskModule(registry.addressFor(SENTIMENT_RISK_MODULE_KEY));
        emit PoolSet(address(pool));
        emit RiskModuleSet(address(riskModule));
    }

    /// @notice Fetch value of given asset amount in ETH
    function getValueInEth(address asset, uint256 amt) public view returns (uint256) {
        if (amt == 0) return 0;
        address oracle = oracleFor[asset];
        if (oracle == address(0)) revert RiskEngine_NoOracleFound(asset);
        return IOracle(oracle).getValueInEth(asset, amt);
    }

    /// @notice Fetch position health factor
    function getPositionHealthFactor(address position) external view returns (uint256) {
        return riskModule.getPositionHealthFactor(position);
    }

    /// @notice Validate liquidator data and value of assets seized
    function validateLiquidation(
        address position,
        DebtData[] calldata debtData,
        AssetData[] calldata assetData
    )
        external
        view
        returns (uint256, uint256, DebtData[] memory, AssetData[] memory)
    {
        return riskModule.validateLiquidation(position, debtData, assetData);
    }

    /// @notice Validate liquidator data for assets to be repaid
    function validateBadDebtLiquidation(
        address position,
        DebtData[] calldata debtData
    )
        external
        view
        returns (DebtData[] memory, AssetData[] memory)
    {
        return riskModule.validateBadDebtLiquidation(position, debtData);
    }

    /// @notice Fetch risk-associated data for a given position
    /// @param position The address of the position to get the risk data for
    /// @return totalAssetValue The total asset value of the position
    /// @return totalDebtValue The total debt value of the position
    /// @return minReqAssetValue The minimum required asset value for the position to be healthy
    function getRiskData(address position) external view returns (uint256, uint256, uint256) {
        return riskModule.getRiskData(position);
    }

    /// @notice Allow poolA to lend against positions that also borrow from poolB
    /// @dev When toggled or untoggled, only applies to future borrows
    function toggleAllowedPoolPair(uint256 poolA, uint256 poolB) external {
        if (pool.ownerOf(poolA) != msg.sender) revert RiskEngine_OnlyPoolOwner(poolA, msg.sender);
        if (pool.ownerOf(poolB) == address(0)) revert RiskEngine_InvalidBasePool(poolB);
        isAllowedPair[poolA][poolB] = !isAllowedPair[poolA][poolB];
        emit PoolPairToggled(poolA, poolB, isAllowedPair[poolA][poolB]);
    }

    /// @notice Propose an LTV update for a given Pool-Asset pair
    /// @dev overwrites any pending or expired updates
    function requestLtvUpdate(uint256 poolId, address asset, uint256 ltv) external {
        if (msg.sender != pool.ownerOf(poolId)) revert RiskEngine_OnlyPoolOwner(poolId, msg.sender);

        // set oracle before ltv so risk modules don't have to explicitly check if an oracle exists
        if (oracleFor[asset] == address(0)) revert RiskEngine_NoOracleFound(asset);

        // ensure new ltv is within global limits. also enforces that an existing ltv cannot be updated to zero
        if (ltv < minLtv || ltv > maxLtv) revert RiskEngine_LtvLimitBreached(ltv);

        // Positions cannot borrow against the same asset that is being lent out
        if (pool.getPoolAssetFor(poolId) == asset) revert RiskEngine_CannotBorrowPoolAsset(poolId);

        LtvUpdate memory ltvUpdate;
        // only modification of previously set ltvs require a timelock
        if (ltvFor[poolId][asset] == 0) ltvUpdate = LtvUpdate({ ltv: ltv, validAfter: block.timestamp });
        else ltvUpdate = LtvUpdate({ ltv: ltv, validAfter: block.timestamp + TIMELOCK_DURATION });

        ltvUpdateFor[poolId][asset] = ltvUpdate;

        emit LtvUpdateRequested(poolId, asset, ltvUpdate);
    }

    /// @notice Apply a pending LTV update
    function acceptLtvUpdate(uint256 poolId, address asset) external {
        if (msg.sender != pool.ownerOf(poolId)) revert RiskEngine_OnlyPoolOwner(poolId, msg.sender);
        if (oracleFor[asset] == address(0)) revert RiskEngine_NoOracleFound(asset);

        LtvUpdate memory ltvUpdate = ltvUpdateFor[poolId][asset];

        // revert if there is no pending update
        if (ltvUpdate.validAfter == 0) revert RiskEngine_NoLtvUpdate(poolId, asset);

        // revert if called before timelock delay has passed
        if (ltvUpdate.validAfter > block.timestamp) revert RiskEngine_LtvUpdateTimelocked(poolId, asset);

        // revert if timelock deadline has passed
        if (block.timestamp > ltvUpdate.validAfter + TIMELOCK_DEADLINE) {
            revert RiskEngine_LtvUpdateExpired(poolId, asset);
        }

        // apply changes
        ltvFor[poolId][asset] = ltvUpdate.ltv;
        delete ltvUpdateFor[poolId][asset];
        emit LtvUpdateAccepted(poolId, asset, ltvUpdate.ltv);
    }

    /// @notice Reject a pending LTV update
    function rejectLtvUpdate(uint256 poolId, address asset) external {
        if (msg.sender != pool.ownerOf(poolId)) revert RiskEngine_OnlyPoolOwner(poolId, msg.sender);

        delete ltvUpdateFor[poolId][asset];

        emit LtvUpdateRejected(poolId, asset);
    }

    /// @notice Set Protocol LTV bounds
    function setLtvBounds(uint256 _minLtv, uint256 _maxLtv) external onlyOwner {
        if (_minLtv == 0) revert RiskEngine_MinLtvTooLow();
        if (_maxLtv >= 1e18) revert RiskEngine_MaxLtvTooHigh();
        if (_minLtv >= _maxLtv) revert RiskEngine_InvalidLtvLimits(_minLtv, _maxLtv);

        minLtv = _minLtv;
        maxLtv = _maxLtv;

        emit LtvBoundsSet(_minLtv, _maxLtv);
    }

    /// @notice Set the oracle address used to price a given asset
    /// @dev Does not support ERC777s, rebasing and fee-on-transfer tokens
    function setOracle(address asset, address oracle) external onlyOwner {
        oracleFor[asset] = oracle;

        emit OracleSet(asset, oracle);
    }

    /// @notice Update the registry associated with this Risk Engine
    function setRegistry(address newRegistry) external onlyOwner {
        registry = Registry(newRegistry);
        emit RegistrySet(newRegistry);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/IERC1967.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967Upgrade is IERC1967 {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/beacon/BeaconProxy.sol)

pragma solidity ^0.8.0;

import "./IBeacon.sol";
import "../Proxy.sol";
import "../ERC1967/ERC1967Upgrade.sol";

/**
 * @dev This contract implements a proxy that gets the implementation address for each call from an {UpgradeableBeacon}.
 *
 * The beacon address is stored in storage slot `uint256(keccak256('eip1967.proxy.beacon')) - 1`, so that it doesn't
 * conflict with the storage layout of the implementation behind the proxy.
 *
 * _Available since v3.4._
 */
contract BeaconProxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the proxy with `beacon`.
     *
     * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon. This
     * will typically be an encoded function call, and allows initializing the storage of the proxy like a Solidity
     * constructor.
     *
     * Requirements:
     *
     * - `beacon` must be a contract with the interface {IBeacon}.
     */
    constructor(address beacon, bytes memory data) payable {
        _upgradeBeaconToAndCall(beacon, data, false);
    }

    /**
     * @dev Returns the current beacon address.
     */
    function _beacon() internal view virtual returns (address) {
        return _getBeacon();
    }

    /**
     * @dev Returns the current implementation address of the associated beacon.
     */
    function _implementation() internal view virtual override returns (address) {
        return IBeacon(_getBeacon()).implementation();
    }

    /**
     * @dev Changes the proxy to use a new beacon. Deprecated: see {_upgradeBeaconToAndCall}.
     *
     * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon.
     *
     * Requirements:
     *
     * - `beacon` must be a contract.
     * - The implementation returned by `beacon` must be a contract.
     */
    function _setBeacon(address beacon, bytes memory data) internal virtual {
        _upgradeBeaconToAndCall(beacon, data, false);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

// types
import { Registry } from "./Registry.sol";
import { RiskEngine } from "./RiskEngine.sol";
import { IOracle } from "./interfaces/IOracle.sol";
import { IRateModel } from "./interfaces/IRateModel.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

// libraries
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";

// contracts
import { ERC6909 } from "./lib/ERC6909.sol";
import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";

/// @title Pool
/// @notice Singleton pool for all pools that superpools lend to and positions borrow from
contract Pool is OwnableUpgradeable, PausableUpgradeable, ERC6909 {
    using Math for uint256;
    using SafeERC20 for IERC20;

    address private constant DEAD_ADDRESS = 0x000000000000000000000000000000000000dEaD;
    /// @notice Maximum amount of deposit shares per base pool
    uint256 public constant MAX_DEPOSIT_SHARES = type(uint112).max;
    /// @notice Maximum amount of borrow shares per base pool
    uint256 public constant MAX_BORROW_SHARES = type(uint112).max;
    /// @notice Minimum amount of initial shares to be burned
    uint256 public constant MIN_BURNED_SHARES = 1_000_000;
    /// @notice Timelock delay for pool rate model modification
    uint256 public constant TIMELOCK_DURATION = 24 * 60 * 60; // 24 hours
    /// @notice Timelock deadline to enforce timely updates
    uint256 public constant TIMELOCK_DEADLINE = 3 * 24 * 60 * 60; // 72 hours
    /// @notice Registry key hash for the Sentiment position manager
    /// @dev keccak(SENTIMENT_POSITION_MANAGER_KEY)
    bytes32 public constant SENTIMENT_POSITION_MANAGER_KEY =
        0xd4927490fbcbcafca716cca8e8c8b7d19cda785679d224b14f15ce2a9a93e148;
    /// @notice Sentiment risk engine registry key
    /// @dev keccak(SENTIMENT_RISK_ENGINE_KEY)
    bytes32 public constant SENTIMENT_RISK_ENGINE_KEY =
        0x5b6696788621a5d6b5e3b02a69896b9dd824ebf1631584f038a393c29b6d7555;

    /// @notice Initial interest fee for pools
    uint256 public defaultInterestFee;
    /// @notice Initial origination fee for pools
    uint256 public defaultOriginationFee;

    /// @notice Sentiment registry
    address public registry;
    /// @notice Sentiment fee receiver
    address public feeRecipient;
    /// @notice Sentiment position manager
    address public positionManager;
    /// @notice Sentiment Risk Engine
    address public riskEngine;

    /// @notice minimum amount that must be borrowed in a single operation
    uint256 public minBorrow; // in eth
    /// @notice minimum debt that a borrower must maintain
    uint256 public minDebt; // in eth

    /// @notice Fetch the owner for a given pool id
    mapping(uint256 poolId => address poolOwner) public ownerOf;
    /// @notice Fetch debt owed by a given position for a particular pool, denominated in borrow shares
    mapping(uint256 poolId => mapping(address position => uint256 borrowShares)) public borrowSharesOf;

    /// @title PoolData
    /// @notice Pool config and state container
    struct PoolData {
        bool isPaused;
        address asset;
        address rateModel;
        uint256 borrowCap;
        uint256 depositCap;
        uint256 lastUpdated;
        uint256 interestFee;
        uint256 originationFee;
        uint256 totalBorrowAssets;
        uint256 totalBorrowShares;
        uint256 totalDepositAssets;
        uint256 totalDepositShares;
    }

    /// @notice Fetch pool config and state for a given pool id
    mapping(uint256 poolId => PoolData data) public poolDataFor;

    /// @title RateModelUpdate
    /// @notice Utility struct to store pending pool rate model updates
    struct RateModelUpdate {
        address rateModel;
        uint256 validAfter;
    }

    /// @notice Fetch pending rate model updates for a given pool id
    mapping(uint256 poolId => RateModelUpdate rateModelUpdate) public rateModelUpdateFor;

    /// @notice Position Manager addresss was updated
    event PositionManagerSet(address positionManager);
    /// @notice Risk Engine address was updated
    event RiskEngineSet(address riskEngine);
    /// @notice Minimum debt amount set
    event MinDebtSet(uint256 minDebt);
    /// @notice Minimum borrow amount set
    event MinBorrowSet(uint256 minBorrow);
    /// @notice Registry address was set
    event RegistrySet(address registry);
    /// @notice Pool fee recipient set
    event FeeRecipientSet(address feeRecipient);
    /// @notice Paused state of a pool was toggled
    event PoolPauseToggled(uint256 poolId, bool paused);
    /// @notice Asset cap for a pool was set
    event PoolCapSet(uint256 indexed poolId, uint256 poolCap);
    /// @notice Borrow debt ceiling for a pool was set
    event BorrowCapSet(uint256 indexed poolId, uint256 borrowCap);
    /// @notice Owner for a pool was set
    event PoolOwnerSet(uint256 indexed poolId, address owner);
    /// @notice Rate model for a pool was updated
    event RateModelUpdated(uint256 indexed poolId, address rateModel);
    /// @notice Interest fee for a pool was updated
    event InterestFeeSet(uint256 indexed poolId, uint256 interestFee);
    /// @notice Origination fee for a pool was updated
    event OriginationFeeSet(uint256 indexed poolId, uint256 originationFee);
    /// @notice Pending rate model update for a pool was rejected
    event RateModelUpdateRejected(uint256 indexed poolId, address rateModel);
    /// @notice Rate model update for a pool was proposed
    event RateModelUpdateRequested(uint256 indexed poolId, address rateModel);
    /// @notice Default interest fee for new pools updated
    event DefaultInterestFeeSet(uint256 defaultInterestFee);
    /// @notice Default origination fee for new pools updated
    event DefaultOriginationFeeSet(uint256 defaultOriginationFee);
    /// @notice New pool was initialized
    event PoolInitialized(uint256 indexed poolId, address indexed owner, address indexed asset);
    /// @notice Assets were deposited to a pool
    event Deposit(address indexed caller, address indexed owner, uint256 assets, uint256 shares);
    /// @notice Debt was repaid from a position to a pool
    event Repay(address indexed position, uint256 indexed poolId, address indexed asset, uint256 amount);
    /// @notice Assets were borrowed from a position to a pool
    event Borrow(address indexed position, uint256 indexed poolId, address indexed asset, uint256 amount);
    /// @notice Assets were withdrawn from a pool
    event Withdraw(
        address indexed caller, address indexed receiver, address indexed owner, uint256 assets, uint256 shares
    );

    /// @notice Given fee value is greater than 100%
    error Pool_FeeTooHigh();
    /// @notice Zero address cannot be the pool owner
    error Pool_ZeroAddressOwner();
    /// @notice Pool is paused
    error Pool_PoolPaused(uint256 poolId);
    /// @notice Total Base Pool shares exceeds MAX_DEPOSIT_SHARES
    error Pool_MaxDepositShares(uint256 poolId);
    /// @notice Total borrow shares exceed MAX_BORROW_SHARES
    error Pool_MaxBorrowShares(uint256 poolId);
    /// @notice Pool borrow cap exceeded
    error Pool_BorrowCapExceeded(uint256 poolId);
    /// @notice Pool deposits exceed asset cap
    error Pool_PoolCapExceeded(uint256 poolId);
    /// @notice No pending rate model update for the pool
    error Pool_NoRateModelUpdate(uint256 poolId);
    /// @notice Attempt to initialize an already existing pool
    error Pool_PoolAlreadyInitialized(uint256 poolId);
    /// @notice Attempt to redeem zero shares worth of assets from the pool
    error Pool_ZeroShareWithdraw(uint256 poolId, uint256 assets);
    /// @notice Attempt to repay zero shares worth of assets to the pool
    error Pool_ZeroSharesRepay(uint256 poolId, uint256 amt);
    /// @notice Attempt to borrow zero shares worth of assets from the pool
    error Pool_ZeroSharesBorrow(uint256 poolId, uint256 amt);
    /// @notice Attempt to deposit zero shares worth of assets to the pool
    error Pool_ZeroSharesDeposit(uint256 poolId, uint256 amt);
    /// @notice Function access restricted only to the pool owner
    error Pool_OnlyPoolOwner(uint256 poolId, address sender);
    /// @notice Function access restricted only to Sentiment Position Manager
    error Pool_OnlyPositionManager(uint256 poolId, address sender);
    /// @notice Insufficient pool liquidity to service borrow
    error Pool_InsufficientBorrowLiquidity(uint256 poolId, uint256 assetsInPool, uint256 assets);
    /// @notice Insufficient pool liquidity to service withdrawal
    error Pool_InsufficientWithdrawLiquidity(uint256 poolId, uint256 assetsInPool, uint256 assets);
    /// @notice Rate model timelock delay has not been completed
    error Pool_TimelockPending(uint256 poolId, uint256 currentTimestamp, uint256 validAfter);
    /// @notice Rate model timelock deadline has passed
    error Pool_TimelockExpired(uint256 poolId, uint256 currentTimestamp, uint256 validAfter);
    /// @notice Rate model was not found in the Sentiment registry
    error Pool_RateModelNotFound(bytes32 rateModelKey);
    /// @notice Borrowed amount is lower than minimum borrow amount
    error Pool_BorrowAmountTooLow(uint256 poolId, address asset, uint256 amt);
    /// @notice Debt is below min debt amount
    error Pool_DebtTooLow(uint256 poolId, address asset, uint256 amt);
    /// @notice No oracle found for pool asset
    error Pool_OracleNotFound(address asset);
    /// @notice Fee recipient must be non-zero
    error Pool_ZeroFeeRecipient();
    /// @notice Pool has zero assets and non-zero shares
    error Pool_ZeroAssetsNonZeroShares(uint256 poolId);
    /// @notice Less than MIN_BURNED_SHARES burned during pool initialization
    error Pool_MinBurnedShares(uint256 shares);

    constructor() {
        _disableInitializers();
    }

    /// @notice Initializer for TransparentUpgradeableProxy
    /// @param owner_ Pool owner
    /// @param registry_ Sentiment Registry
    /// @param feeRecipient_ Sentiment fee receiver
    function initialize(
        address owner_,
        address registry_,
        address feeRecipient_,
        uint256 minDebt_,
        uint256 minBorrow_,
        uint256 defaultInterestFee_,
        uint256 defaultOriginationFee_
    )
        public
        initializer
    {
        _transferOwnership(owner_);

        if (defaultInterestFee_ > 1e18) revert Pool_FeeTooHigh();
        if (defaultOriginationFee_ > 1e18) revert Pool_FeeTooHigh();
        if (feeRecipient_ == address(0)) revert Pool_ZeroFeeRecipient();

        defaultInterestFee = defaultInterestFee_;
        defaultOriginationFee = defaultOriginationFee_;
        registry = registry_;
        feeRecipient = feeRecipient_;
        minBorrow = minBorrow_;
        minDebt = minDebt_;
        updateFromRegistry();
    }

    /// @notice Fetch and update module addreses from the registry
    function updateFromRegistry() public {
        positionManager = Registry(registry).addressFor(SENTIMENT_POSITION_MANAGER_KEY);
        riskEngine = Registry(registry).addressFor(SENTIMENT_RISK_ENGINE_KEY);
        emit PositionManagerSet(positionManager);
        emit RiskEngineSet(riskEngine);
    }

    /// @notice Fetch amount of liquid assets currently held in a given pool
    function getLiquidityOf(uint256 poolId) public view returns (uint256) {
        PoolData storage pool = poolDataFor[poolId];
        uint256 assetsInPool = pool.totalDepositAssets - pool.totalBorrowAssets;
        uint256 totalBalance = IERC20(pool.asset).balanceOf(address(this));
        return (totalBalance > assetsInPool) ? assetsInPool : totalBalance;
    }

    /// @notice Fetch pool asset balance for depositor to a pool
    function getAssetsOf(uint256 poolId, address guy) public view returns (uint256) {
        PoolData storage pool = poolDataFor[poolId];
        (uint256 accruedInterest, uint256 feeShares) = simulateAccrue(pool);
        return _convertToAssets(
            balanceOf[guy][poolId],
            pool.totalDepositAssets + accruedInterest,
            pool.totalDepositShares + feeShares,
            Math.Rounding.Down
        );
    }

    /// @notice Fetch debt owed by a position to a given pool
    function getBorrowsOf(uint256 poolId, address position) public view returns (uint256) {
        PoolData storage pool = poolDataFor[poolId];
        (uint256 accruedInterest,) = simulateAccrue(pool);
        // [ROUND] round up to enable enable complete debt repayment
        return _convertToAssets(
            borrowSharesOf[poolId][position],
            pool.totalBorrowAssets + accruedInterest,
            pool.totalBorrowShares,
            Math.Rounding.Up
        );
    }

    /// @notice Fetch the total amount of assets currently deposited in a pool
    function getTotalAssets(uint256 poolId) public view returns (uint256) {
        PoolData storage pool = poolDataFor[poolId];
        (uint256 accruedInterest,) = simulateAccrue(pool);
        return pool.totalDepositAssets + accruedInterest;
    }

    /// @notice Fetch total amount of debt owed to a given pool id
    function getTotalBorrows(uint256 poolId) public view returns (uint256) {
        PoolData storage pool = poolDataFor[poolId];
        (uint256 accruedInterest,) = simulateAccrue(pool);
        return pool.totalBorrowAssets + accruedInterest;
    }

    /// @notice Fetch current rate model for a given pool id
    function getRateModelFor(uint256 poolId) public view returns (address rateModel) {
        return poolDataFor[poolId].rateModel;
    }

    /// @notice Fetch pool cap for a given pool
    function getPoolCapFor(uint256 poolId) public view returns (uint256) {
        return poolDataFor[poolId].depositCap;
    }

    /// @notice Fetch borrow cap for a given pool
    function getBorrowCapFor(uint256 poolId) public view returns (uint256) {
        return poolDataFor[poolId].borrowCap;
    }

    /// @notice Fetch the debt asset address for a given pool
    function getPoolAssetFor(uint256 poolId) public view returns (address) {
        return poolDataFor[poolId].asset;
    }

    /// @notice Fetch equivalent shares amount for given assets
    function convertToShares(
        uint256 assets,
        uint256 totalAssets,
        uint256 totalShares
    )
        external
        pure
        returns (uint256 shares)
    {
        shares = _convertToShares(assets, totalAssets, totalShares, Math.Rounding.Down);
    }

    function _convertToShares(
        uint256 assets,
        uint256 totalAssets,
        uint256 totalShares,
        Math.Rounding rounding
    )
        internal
        pure
        returns (uint256 shares)
    {
        if (totalAssets == 0) return assets;
        shares = assets.mulDiv(totalShares, totalAssets, rounding);
    }

    /// @notice Fetch equivalent asset amount for given shares
    function convertToAssets(
        uint256 shares,
        uint256 totalAssets,
        uint256 totalShares
    )
        external
        pure
        returns (uint256 assets)
    {
        assets = _convertToAssets(shares, totalAssets, totalShares, Math.Rounding.Down);
    }

    function _convertToAssets(
        uint256 shares,
        uint256 totalAssets,
        uint256 totalShares,
        Math.Rounding rounding
    )
        internal
        pure
        returns (uint256 assets)
    {
        if (totalShares == 0) return shares;
        assets = shares.mulDiv(totalAssets, totalShares, rounding);
    }

    /// @notice Deposit assets to a pool
    /// @param poolId Pool id
    /// @param assets Amount of assets to be deposited
    /// @param receiver Address to deposit assets on behalf of
    /// @return shares Amount of pool deposit shares minted
    function deposit(uint256 poolId, uint256 assets, address receiver) public whenNotPaused returns (uint256 shares) {
        PoolData storage pool = poolDataFor[poolId];

        if (pool.isPaused) revert Pool_PoolPaused(poolId);
        if (pool.totalDepositAssets == 0 && pool.totalDepositShares != 0) revert Pool_ZeroAssetsNonZeroShares(poolId);

        // update state to accrue interest since the last time accrue() was called
        accrue(pool, poolId);

        // Need to transfer before or ERC777s could reenter, or bypass the pool cap
        IERC20(pool.asset).safeTransferFrom(msg.sender, address(this), assets);

        shares = _convertToShares(assets, pool.totalDepositAssets, pool.totalDepositShares, Math.Rounding.Down);
        if (shares == 0) revert Pool_ZeroSharesDeposit(poolId, assets);

        pool.totalDepositAssets += assets;
        pool.totalDepositShares += shares;
        if (pool.totalDepositAssets > pool.depositCap) revert Pool_PoolCapExceeded(poolId);
        if (pool.totalDepositShares > MAX_DEPOSIT_SHARES) revert Pool_MaxDepositShares(poolId);

        _mint(receiver, poolId, shares);

        emit Deposit(msg.sender, receiver, assets, shares);
    }

    /// @notice Withdraw assets from a pool
    /// @param poolId Pool id
    /// @param assets Amount of assets to be redeemed
    /// @param receiver Address that receives redeemed assets
    /// @param owner Address to redeem on behalf of
    /// @return shares Amount of shares redeemed from the pool
    function withdraw(
        uint256 poolId,
        uint256 assets,
        address receiver,
        address owner
    )
        public
        whenNotPaused
        returns (uint256 shares)
    {
        PoolData storage pool = poolDataFor[poolId];
        if (pool.isPaused) revert Pool_PoolPaused(poolId);

        // update state to accrue interest since the last time accrue() was called
        accrue(pool, poolId);

        shares = _convertToShares(assets, pool.totalDepositAssets, pool.totalDepositShares, Math.Rounding.Up);
        // check for rounding error since convertToShares rounds down
        if (shares == 0) revert Pool_ZeroShareWithdraw(poolId, assets);

        if (msg.sender != owner && !isOperator[owner][msg.sender]) {
            uint256 allowed = allowance[owner][msg.sender][poolId];
            if (allowed != type(uint256).max) allowance[owner][msg.sender][poolId] = allowed - shares;
        }

        uint256 maxWithdrawAssets = pool.totalDepositAssets - pool.totalBorrowAssets;
        uint256 totalBalance = IERC20(pool.asset).balanceOf(address(this));
        maxWithdrawAssets = (totalBalance > maxWithdrawAssets) ? maxWithdrawAssets : totalBalance;
        if (maxWithdrawAssets < assets) revert Pool_InsufficientWithdrawLiquidity(poolId, maxWithdrawAssets, assets);

        pool.totalDepositAssets -= assets;
        pool.totalDepositShares -= shares;

        _burn(owner, poolId, shares);

        emit Withdraw(msg.sender, receiver, owner, assets, shares);

        IERC20(pool.asset).safeTransfer(receiver, assets);
    }

    /// @notice Accrue interest and fees for a given pool
    function accrue(uint256 id) external {
        PoolData storage pool = poolDataFor[id];
        accrue(pool, id);
    }

    function simulateAccrue(PoolData storage pool) internal view returns (uint256, uint256) {
        if (block.timestamp == pool.lastUpdated) return (0, 0);

        uint256 interestAccrued = IRateModel(pool.rateModel).getInterestAccrued(
            pool.lastUpdated, pool.totalBorrowAssets, pool.totalDepositAssets
        );

        uint256 interestFee = pool.interestFee;
        if (interestFee == 0) return (interestAccrued, 0);
        // [ROUND] floor fees in favor of pool lenders
        uint256 feeAssets = interestAccrued.mulDiv(pool.interestFee, 1e18);
        // [ROUND] round down in favor of pool lenders
        uint256 feeShares = _convertToShares(
            feeAssets,
            pool.totalDepositAssets + interestAccrued - feeAssets,
            pool.totalDepositShares,
            Math.Rounding.Down
        );

        return (interestAccrued, feeShares);
    }

    /// @dev update pool state to accrue interest since the last time accrue() was called
    function accrue(PoolData storage pool, uint256 id) internal {
        (uint256 interestAccrued, uint256 feeShares) = simulateAccrue(pool);

        if (feeShares != 0) _mint(feeRecipient, id, feeShares);

        // update pool state
        pool.totalDepositShares += feeShares;
        pool.totalBorrowAssets += interestAccrued;
        pool.totalDepositAssets += interestAccrued;

        // store a timestamp for this accrue() call
        // used to compute the pending interest next time accrue() is called
        pool.lastUpdated = block.timestamp;
    }

    /// @notice Mint borrow shares and send borrowed assets to the borrowing position
    /// @param position the position to mint shares to
    /// @param amt the amount of assets to borrow, denominated in notional asset units
    /// @return borrowShares the amount of shares minted
    function borrow(
        uint256 poolId,
        address position,
        uint256 amt
    )
        external
        whenNotPaused
        returns (uint256 borrowShares)
    {
        PoolData storage pool = poolDataFor[poolId];

        if (pool.isPaused) revert Pool_PoolPaused(poolId);

        // revert if the caller is not the position manager
        if (msg.sender != positionManager) revert Pool_OnlyPositionManager(poolId, msg.sender);

        // revert if borrow amount is too low
        if (RiskEngine(riskEngine).getValueInEth(pool.asset, amt) < minBorrow) {
            revert Pool_BorrowAmountTooLow(poolId, pool.asset, amt);
        }

        // update state to accrue interest since the last time accrue() was called
        accrue(pool, poolId);

        // pools cannot share liquidity among themselves, revert if borrow amt exceeds pool liquidity
        uint256 assetsInPool = pool.totalDepositAssets - pool.totalBorrowAssets;
        if (assetsInPool < amt) revert Pool_InsufficientBorrowLiquidity(poolId, assetsInPool, amt);

        // compute borrow shares equivalant for notional borrow amt
        // [ROUND] round up shares minted, to ensure they capture the borrowed amount
        borrowShares = _convertToShares(amt, pool.totalBorrowAssets, pool.totalBorrowShares, Math.Rounding.Up);

        // revert if borrow amt is too small
        if (borrowShares == 0) revert Pool_ZeroSharesBorrow(poolId, amt);

        // check that final debt amount is greater than min debt
        uint256 newBorrowAssets = _convertToAssets(
            borrowSharesOf[poolId][position] + borrowShares,
            pool.totalBorrowAssets + amt,
            pool.totalBorrowShares + borrowShares,
            Math.Rounding.Down
        );
        if (RiskEngine(riskEngine).getValueInEth(pool.asset, newBorrowAssets) < minDebt) {
            revert Pool_DebtTooLow(poolId, pool.asset, newBorrowAssets);
        }

        // update total pool debt, denominated in notional asset units and shares
        pool.totalBorrowAssets += amt;
        pool.totalBorrowShares += borrowShares;
        borrowSharesOf[poolId][position] += borrowShares;

        // total borrow shares and total borrow assets checks
        if (pool.totalBorrowAssets > pool.borrowCap) revert Pool_BorrowCapExceeded(poolId);
        if (pool.totalBorrowShares > MAX_BORROW_SHARES) revert Pool_MaxBorrowShares(poolId);

        // compute origination fee amt
        // [ROUND] origination fee is rounded down, in favor of the borrower
        uint256 fee = amt.mulDiv(pool.originationFee, 1e18);

        address asset = pool.asset;
        // send origination fee to owner
        if (fee > 0) IERC20(asset).safeTransfer(feeRecipient, fee);

        // send borrowed assets to position
        IERC20(asset).safeTransfer(position, amt - fee);

        emit Borrow(position, poolId, asset, amt);
    }

    /// @notice Decrease position debt via repayment of debt and burn borrow shares
    /// @dev Assumes assets have already been sent to the pool
    /// @param position the position for which debt is being repaid
    /// @param amt the notional amount of debt asset repaid
    /// @return remainingShares remaining debt in borrow shares owed by the position
    function repay(
        uint256 poolId,
        address position,
        uint256 amt
    )
        external
        whenNotPaused
        returns (uint256 remainingShares)
    {
        PoolData storage pool = poolDataFor[poolId];

        // the only way to call repay() is through the position manager
        // PositionManager.repay() MUST transfer the assets to be repaid before calling Pool.repay()
        // this function assumes the transfer of assets was completed successfully

        // there is an implicit assumption that assets were transferred in the same txn lest
        // the call to Pool.repay() is not frontrun allowing debt repayment for another position

        // revert if the caller is not the position manager
        if (msg.sender != positionManager) revert Pool_OnlyPositionManager(poolId, msg.sender);

        // update state to accrue interest since the last time accrue() was called
        accrue(pool, poolId);

        // compute borrow shares equivalent to notional asset amt
        // [ROUND] burn fewer borrow shares, to ensure excess debt isn't pushed to others
        uint256 borrowShares = _convertToShares(amt, pool.totalBorrowAssets, pool.totalBorrowShares, Math.Rounding.Down);

        // revert if repaid amt is too small
        if (borrowShares == 0) revert Pool_ZeroSharesRepay(poolId, amt);

        // check that final debt amount is greater than min debt
        remainingShares = borrowSharesOf[poolId][position] - borrowShares;
        if (remainingShares > 0) {
            uint256 newBorrowAssets = _convertToAssets(
                remainingShares, pool.totalBorrowAssets - amt, pool.totalBorrowShares - borrowShares, Math.Rounding.Down
            );
            if (RiskEngine(riskEngine).getValueInEth(pool.asset, newBorrowAssets) < minDebt) {
                revert Pool_DebtTooLow(poolId, pool.asset, newBorrowAssets);
            }
        }

        // update total pool debt, denominated in notional asset units, and shares
        pool.totalBorrowAssets -= amt;
        pool.totalBorrowShares -= borrowShares;

        // update and return remaining position debt, denominated in borrow shares
        borrowSharesOf[poolId][position] = remainingShares;

        emit Repay(position, poolId, pool.asset, amt);

        return remainingShares;
    }

    function rebalanceBadDebt(uint256 poolId, address position) external whenNotPaused {
        PoolData storage pool = poolDataFor[poolId];
        accrue(pool, poolId);

        // revert if the caller is not the position manager
        if (msg.sender != positionManager) revert Pool_OnlyPositionManager(poolId, msg.sender);

        // compute pool and position debt in shares and assets
        uint256 totalBorrowShares = pool.totalBorrowShares;
        uint256 totalBorrowAssets = pool.totalBorrowAssets;
        uint256 borrowShares = borrowSharesOf[poolId][position];
        // [ROUND] round up against lenders
        uint256 borrowAssets = _convertToAssets(borrowShares, totalBorrowAssets, totalBorrowShares, Math.Rounding.Up);

        // rebalance bad debt across lenders
        pool.totalBorrowShares = totalBorrowShares - borrowShares;
        // handle borrowAssets being rounded up to be greater than totalBorrowAssets
        pool.totalBorrowAssets = (totalBorrowAssets > borrowAssets) ? totalBorrowAssets - borrowAssets : 0;
        uint256 totalDepositAssets = pool.totalDepositAssets;
        pool.totalDepositAssets = (totalDepositAssets > borrowAssets) ? totalDepositAssets - borrowAssets : 0;
        borrowSharesOf[poolId][position] = 0;
    }

    /// @notice Initialize a new pool
    /// @param owner Pool owner
    /// @param asset Pool debt asset
    /// @param depositCap Pool asset cap
    /// @param borrowCap Pool debt ceiling
    /// @param rateModelKey Registry key for interest rate model
    /// @return poolId Pool id for initialized pool
    function initializePool(
        address owner,
        address asset,
        bytes32 rateModelKey,
        uint256 depositCap,
        uint256 borrowCap,
        uint256 initialDepositAmt
    )
        external
        whenNotPaused
        returns (uint256 poolId)
    {
        if (owner == address(0)) revert Pool_ZeroAddressOwner();
        if (RiskEngine(riskEngine).oracleFor(asset) == address(0)) revert Pool_OracleNotFound(asset);

        address rateModel = Registry(registry).rateModelFor(rateModelKey);
        if (rateModel == address(0)) revert Pool_RateModelNotFound(rateModelKey);

        poolId = uint256(keccak256(abi.encodePacked(owner, asset, rateModelKey)));
        if (ownerOf[poolId] != address(0)) revert Pool_PoolAlreadyInitialized(poolId);
        ownerOf[poolId] = owner;

        PoolData memory poolData = PoolData({
            isPaused: false,
            asset: asset,
            rateModel: rateModel,
            borrowCap: borrowCap,
            depositCap: depositCap,
            lastUpdated: block.timestamp,
            interestFee: defaultInterestFee,
            originationFee: defaultOriginationFee,
            totalBorrowAssets: 0,
            totalBorrowShares: 0,
            totalDepositAssets: 0,
            totalDepositShares: 0
        });
        poolDataFor[poolId] = poolData;

        // burn initial deposit, assume msg.sender has approved
        uint256 shares = deposit(poolId, initialDepositAmt, DEAD_ADDRESS);
        if (shares < MIN_BURNED_SHARES) revert Pool_MinBurnedShares(shares);

        emit PoolInitialized(poolId, owner, asset);
        emit RateModelUpdated(poolId, rateModel);
        emit PoolCapSet(poolId, depositCap);
        emit BorrowCapSet(poolId, borrowCap);
    }

    /// @notice Toggle paused state for a pool to restrict deposit and borrows
    function togglePause(uint256 poolId) external {
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);
        PoolData storage pool = poolDataFor[poolId];
        pool.isPaused = !pool.isPaused;
        emit PoolPauseToggled(poolId, pool.isPaused);
    }

    /// @notice Pause all pools and functions
    function togglePauseAll() external onlyOwner {
        if (PausableUpgradeable.paused()) PausableUpgradeable._unpause();
        else PausableUpgradeable._pause();
    }

    /// @notice Update pool asset cap to restrict total amount of assets deposited
    function setPoolCap(uint256 poolId, uint256 depositCap) external {
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);
        poolDataFor[poolId].depositCap = depositCap;
        emit PoolCapSet(poolId, depositCap);
    }

    /// @notice Update pool borrow cap to restrict total amount of assets borrowed
    function setBorrowCap(uint256 poolId, uint256 borrowCap) external {
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);
        poolDataFor[poolId].borrowCap = borrowCap;
        emit BorrowCapSet(poolId, borrowCap);
    }

    /// @notice Update base pool owner
    function setPoolOwner(uint256 poolId, address newOwner) external {
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);
        // address(0) cannot own pools since it is used to denote uninitalized pools
        if (newOwner == address(0)) revert Pool_ZeroAddressOwner();
        ownerOf[poolId] = newOwner;
        emit PoolOwnerSet(poolId, newOwner);
    }

    /// @notice Propose a interest rate model update for a pool
    /// @dev overwrites any pending or expired updates
    function requestRateModelUpdate(uint256 poolId, bytes32 rateModelKey) external {
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);

        // store the rateModel instead of the registry key to mitigate issues
        // arising from registry changes taking place between request/accept
        // to pull registry update, call this function with the same key again
        address rateModel = Registry(registry).rateModelFor(rateModelKey);
        if (rateModel == address(0)) revert Pool_RateModelNotFound(rateModelKey);

        RateModelUpdate memory rateModelUpdate =
            RateModelUpdate({ rateModel: rateModel, validAfter: block.timestamp + TIMELOCK_DURATION });

        rateModelUpdateFor[poolId] = rateModelUpdate;

        emit RateModelUpdateRequested(poolId, rateModel);
    }

    /// @notice Apply a pending interest rate model change for a pool
    function acceptRateModelUpdate(uint256 poolId) external {
        accrue(poolDataFor[poolId], poolId); // accrue pending interest using previous rate model
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);
        RateModelUpdate memory rateModelUpdate = rateModelUpdateFor[poolId];

        // revert if there is no update to apply
        if (rateModelUpdate.validAfter == 0) revert Pool_NoRateModelUpdate(poolId);

        // revert if called before timelock delay has passed
        if (block.timestamp < rateModelUpdate.validAfter) {
            revert Pool_TimelockPending(poolId, block.timestamp, rateModelUpdate.validAfter);
        }

        // revert if timelock deadline has passed
        if (block.timestamp > rateModelUpdate.validAfter + TIMELOCK_DEADLINE) {
            revert Pool_TimelockExpired(poolId, block.timestamp, rateModelUpdate.validAfter);
        }

        // apply update
        poolDataFor[poolId].rateModel = rateModelUpdate.rateModel;
        delete rateModelUpdateFor[poolId];
        emit RateModelUpdated(poolId, rateModelUpdate.rateModel);
    }

    /// @notice Reject pending interest rate model update
    function rejectRateModelUpdate(uint256 poolId) external {
        if (msg.sender != ownerOf[poolId]) revert Pool_OnlyPoolOwner(poolId, msg.sender);
        emit RateModelUpdateRejected(poolId, rateModelUpdateFor[poolId].rateModel);
        delete rateModelUpdateFor[poolId];
    }

    /// @notice Set protocol registry address
    /// @param _registry Registry address
    function setRegistry(address _registry) external onlyOwner {
        registry = _registry;
        updateFromRegistry();
        emit RegistrySet(_registry);
    }

    /// @notice Set interest fee for given pool
    /// @param poolId Pool id
    /// @param interestFee New interest fee
    function setInterestFee(uint256 poolId, uint256 interestFee) external onlyOwner {
        if (interestFee > 1e18) revert Pool_FeeTooHigh();
        PoolData storage pool = poolDataFor[poolId];
        accrue(pool, poolId);
        pool.interestFee = interestFee;
        emit InterestFeeSet(poolId, interestFee);
    }

    /// @notice Set origination fee for given pool
    /// @param poolId Pool id
    /// @param originationFee New origination fee
    function setOriginationFee(uint256 poolId, uint256 originationFee) external onlyOwner {
        if (originationFee > 1e18) revert Pool_FeeTooHigh();
        poolDataFor[poolId].originationFee = originationFee;
        emit OriginationFeeSet(poolId, originationFee);
    }

    /// @notice Update the minimum borrow amount
    function setMinBorrow(uint256 newMinBorrow) external onlyOwner {
        minBorrow = newMinBorrow;
        emit MinBorrowSet(newMinBorrow);
    }

    /// @notice Update the min debt amount
    function setMinDebt(uint256 newMinDebt) external onlyOwner {
        minDebt = newMinDebt;
        emit MinDebtSet(newMinDebt);
    }

    function setFeeRecipient(address newFeeRecipient) external onlyOwner {
        if (newFeeRecipient == address(0)) revert Pool_ZeroFeeRecipient();
        feeRecipient = newFeeRecipient;
        emit FeeRecipientSet(newFeeRecipient);
    }

    function setDefaultOriginationFee(uint256 newDefaultOriginationFee) external onlyOwner {
        if (newDefaultOriginationFee > 1e18) revert Pool_FeeTooHigh();
        defaultOriginationFee = newDefaultOriginationFee;
        emit DefaultOriginationFeeSet(newDefaultOriginationFee);
    }

    function setDefaultInterestFee(uint256 newDefaultInterestFee) external onlyOwner {
        if (newDefaultInterestFee > 1e18) revert Pool_FeeTooHigh();
        defaultInterestFee = newDefaultInterestFee;
        emit DefaultInterestFeeSet(newDefaultInterestFee);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import { Pool } from "./Pool.sol";
import { RiskEngine } from "./RiskEngine.sol";
import { IterableSet } from "./lib/IterableSet.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/// @title Position
contract Position {
    using SafeERC20 for IERC20;
    using IterableSet for IterableSet.AddressSet;
    using IterableSet for IterableSet.Uint256Set;

    /// @notice Position implementation version
    uint256 public constant VERSION = 1;
    /// @notice Maximum number of assets that a position can hold at once
    uint256 public constant MAX_ASSETS = 5;
    /// @notice Maximum number of pools that a position can borrow from at once
    uint256 public constant MAX_DEBT_POOLS = 5;

    /// @notice Sentiment Pool
    Pool public immutable POOL;
    /// @notice Sentiment Risk Engine
    RiskEngine public immutable RISK_ENGINE;
    /// @notice Sentiment Position Manager
    address public immutable POSITION_MANAGER;

    /// @dev Iterable uint256 set that stores pool ids with active borrows
    IterableSet.Uint256Set internal debtPools;
    /// @dev Iterable address set that stores assets held by the position
    IterableSet.AddressSet internal positionAssets;

    /// @notice Number of assets held by the position exceeds `MAX_ASSETS`
    error Position_MaxAssetsExceeded(address position);
    /// @notice Number of pools with active borrows exceeds `MAX_DEBT_POOLS`
    error Position_MaxDebtPoolsExceeded(address position);
    /// @notice Exec operation on the position returned false
    error Position_ExecFailed(address position, address target);
    /// @notice Function access restricted to Sentiment Position Manager
    error Position_OnlyPositionManager(address position, address sender);
    /// @notice Invalid base pool pair borrow
    error Position_InvalidPoolPair(uint256 poolA, uint256 poolB);

    /// @param pool Sentiment Singleton Pool
    /// @param positionManager Sentiment Postion Manager
    constructor(address pool, address positionManager, address riskEngine) {
        POOL = Pool(pool);
        POSITION_MANAGER = positionManager;
        RISK_ENGINE = RiskEngine(riskEngine);
    }

    // positions can receive and hold ether to perform external operations.
    // ether is otherwise ignored by the rest of the protocol. it does not count
    // towards the position balance, pools cannot lend ether and it cannot be
    // used as collateral to borrow other assets
    receive() external payable { }

    modifier onlyPositionManager() {
        if (msg.sender != POSITION_MANAGER) revert Position_OnlyPositionManager(address(this), msg.sender);
        _;
    }

    /// @notice Fetch list of pool ids with active borrows to the position
    function getDebtPools() external view returns (uint256[] memory) {
        return debtPools.getElements();
    }

    /// @notice Fetch list of assets currently held by the position
    function getPositionAssets() external view returns (address[] memory) {
        return positionAssets.getElements();
    }

    /// @notice Check if a given asset exists in the position asset set
    /// @dev an asset with zero balance could be in the set until explicitly removed
    function hasAsset(address asset) external view returns (bool) {
        return positionAssets.contains(asset);
    }

    /// @notice Check if a given debt pool exists in the debt pool set
    /// @dev Position.repay() removes the debt pool after complete repayment
    function hasDebt(uint256 poolId) external view returns (bool) {
        return debtPools.contains(poolId);
    }

    /// @notice Approve an external contract to spend funds from the position
    /// @dev The position manager imposes additional checks that the spender is trusted
    function approve(address token, address spender, uint256 amt) external onlyPositionManager {
        // use forceApprove to handle tokens with non-standard return values
        // and tokens that force setting allowance to zero before modification
        IERC20(token).forceApprove(spender, amt);
    }

    /// @notice Transfer assets from a position to a given external address
    /// @dev Any additional checks must be implemented in the position manager
    function transfer(address to, address asset, uint256 amt) external onlyPositionManager {
        // handle tokens with non-standard return values using safeTransfer
        IERC20(asset).safeTransfer(to, amt);
    }

    /// @notice Intereact with external contracts using arbitrary calldata
    /// @dev Target and calldata is validated by the position manager
    function exec(address target, uint256 value, bytes calldata data) external onlyPositionManager {
        (bool success,) = target.call{ value: value }(data);
        if (!success) revert Position_ExecFailed(address(this), target);
    }

    /// @notice Add asset to the list of tokens currently held by the position
    function addToken(address asset) external onlyPositionManager {
        positionAssets.insert(asset);
        if (positionAssets.length() > MAX_ASSETS) revert Position_MaxAssetsExceeded(address(this));
    }

    /// @notice Remove asset from the list of tokens currrently held by the position
    function removeToken(address asset) external onlyPositionManager {
        positionAssets.remove(asset);
    }

    /// @notice Signal that the position has borrowed from a given pool
    /// @dev Position assumes that this is done after debt assets have been transferred and
    ///      Pool.borrow() has already been called
    function borrow(uint256 poolId, uint256) external onlyPositionManager {
        // check if existing debt pools allow co-borrowing with given pool
        uint256[] memory pools = debtPools.getElements();
        uint256 debtPoolsLen = debtPools.length();
        for (uint256 i; i < debtPoolsLen; ++i) {
            if (poolId == pools[i]) continue;
            if (RISK_ENGINE.isAllowedPair(poolId, pools[i]) && RISK_ENGINE.isAllowedPair(pools[i], poolId)) continue;
            revert Position_InvalidPoolPair(poolId, pools[i]);
        }

        // update debt pools set
        debtPools.insert(poolId);
        if (debtPools.length() > MAX_DEBT_POOLS) revert Position_MaxDebtPoolsExceeded(address(this));
    }

    /// @notice Signal that the position has repaid debt to a given pool
    /// @dev Position assumes that this is done after debt assets have been transferred and
    ///      Pool.repay() has been called so the pool can be removed from `debtPools` as needed
    function repay(uint256 poolId, uint256) external onlyPositionManager {
        if (POOL.getBorrowsOf(poolId, address(this)) == 0) debtPools.remove(poolId);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

// types
import { Pool } from "./Pool.sol";
import { Position } from "./Position.sol";
import { Registry } from "./Registry.sol";
import { RiskEngine } from "./RiskEngine.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

// libraries
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";

// contracts
import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import { ReentrancyGuardUpgradeable } from "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import { BeaconProxy } from "@openzeppelin/contracts/proxy/beacon/BeaconProxy.sol";

/// @title DebtData
/// @notice Data struct for position debt to be repaid by the liquidator
struct DebtData {
    // poolId address for debt to be repaid
    uint256 poolId;
    // amount of debt to be repaid by the liquidator
    // position manager assumes that this amount has already been approved
    uint256 amt;
}

/// @title AssetData
/// @notice Data struct for collateral assets to be received by the liquidator
struct AssetData {
    // token address
    address asset;
    // amount of collateral to be received by liquidator
    uint256 amt;
}

/// @title Operation
/// @notice Operation type definitions that can be applied to a position
/// @dev Every operation except NewPosition requires that the caller must be an authz caller or owner
enum Operation {
    NewPosition, // create2 a new position with a given type, no auth needed
    // the following operations require msg.sender to be authorized
    Exec, // execute arbitrary calldata on a position
    Deposit, // Add collateral to a given position
    Transfer, // transfer assets from the position to a external address
    Approve, // allow a spender to transfer assets from a position
    Repay, // decrease position debt
    Borrow, // increase position debt
    AddToken, // upsert collateral asset to position storage
    RemoveToken // remove collateral asset from position storage

}

/// @title Action
/// @notice Generic data struct to create a common data container for all operation types
/// @dev target and data are interpreted in different ways based on the operation type
struct Action {
    // operation type
    Operation op;
    // dynamic bytes data, interepreted differently across operation types
    bytes data;
}

/// @title PositionManager
/// @notice Handles the deployment and use of Positions against the Singleton Pool Contract
contract PositionManager is ReentrancyGuardUpgradeable, OwnableUpgradeable, PausableUpgradeable {
    using Math for uint256;
    using SafeERC20 for IERC20;

    uint256 internal constant WAD = 1e18;
    uint256 internal constant BAD_DEBT_LIQUIDATION_FEE = 0;

    // keccak(SENTIMENT_POOL_KEY)
    bytes32 public constant SENTIMENT_POOL_KEY = 0x1a99cbf6006db18a0e08427ff11db78f3ea1054bc5b9d48122aae8d206c09728;
    // keccak(SENTIMENT_RISK_ENGINE_KEY)
    bytes32 public constant SENTIMENT_RISK_ENGINE_KEY =
        0x5b6696788621a5d6b5e3b02a69896b9dd824ebf1631584f038a393c29b6d7555;
    // keccak(SENTIMENT_POSITION_BEACON_KEY)
    bytes32 public constant SENTIMENT_POSITION_BEACON_KEY =
        0x6e7384c78b0e09fb848f35d00a7b14fc1ad10ae9b10117368146c0e09b6f2fa2;

    /// @notice Sentiment Singleton Pool
    Pool public pool;
    /// @notice Sentiment Registry
    Registry public registry;
    /// @notice Sentiment Risk Engine
    RiskEngine public riskEngine;
    /// @notice Position Beacon
    address public positionBeacon;

    /// @notice Fetch owner for given position
    mapping(address position => address owner) public ownerOf;

    /// @notice Check if a given address is allowed to operate on a particular position
    /// @dev [caller][position] => [isAuthorized] stores if caller is authorized to operate on position
    mapping(address position => mapping(address caller => bool isAuthz)) public isAuth;

    // universe mappings:
    // the following two mappings define the universe of the protocol. this is used to define a
    // subset of the network that a position can freely interact with. isKnownAddress defines
    // recognized addresses. these include assets that a position interacts with and addresses that
    // can approved as spenders' for assets in a position. isKnownFunc defines the exec universe
    // for a function by creating a mapping of particular target-function pairs that can be called
    // by a position.

    /// @notice Check if a given address is recognized by the protocol
    mapping(address asset => bool isAllowed) public isKnownAsset;
    /// @notice Check if a given spender is recognized by the protocol
    mapping(address spender => bool isKnown) public isKnownSpender;
    /// @notice Check if a position can interact with a given target-function pair
    mapping(address target => mapping(bytes4 method => bool isAllowed)) public isKnownFunc;

    /// @notice Pool address was updated
    event PoolSet(address pool);
    /// @notice Position Beacon address was updated
    event BeaconSet(address beacon);
    /// @notice Protocol registry address was updated
    event RegistrySet(address registry);
    /// @notice Risk Engine address was updated
    event RiskEngineSet(address riskEngine);
    /// @notice Position authorization was toggled
    event AuthToggled(address indexed position, address indexed user, bool isAuth);
    /// @notice Known state of an address was toggled
    event ToggleKnownAsset(address indexed asset, bool isAllowed);
    /// @notice Known state of an address was toggled
    event ToggleKnownSpender(address indexed spender, bool isAllowed);
    /// @notice Token was added to a position's asset list
    event AddToken(address indexed position, address indexed caller, address asset);
    /// @notice Known state of a target-function pair was toggled
    event ToggleKnownFunc(address indexed target, bytes4 indexed method, bool isAllowed);
    /// @notice Token was removed from a position's asset list
    event RemoveToken(address indexed position, address indexed caller, address asset);
    /// @notice Position was successfully liquidated
    event Liquidation(address indexed position, address indexed liquidator, address indexed owner);
    /// @notice New position was deployed
    event PositionDeployed(address indexed position, address indexed caller, address indexed owner);
    /// @notice Assets were deposited to a position
    event Deposit(address indexed position, address indexed depositor, address asset, uint256 amount);
    /// @notice Debt was repaid from a position to a pool
    event Repay(address indexed position, address indexed caller, uint256 indexed poolId, uint256 amount);
    /// @notice Assets were borrowed from a pool to a position
    event Borrow(address indexed position, address indexed caller, uint256 indexed poolId, uint256 amount);
    /// @notice An external operation was executed on a position
    event Exec(address indexed position, address indexed caller, address indexed target, bytes4 functionSelector);
    /// @notice Assets were transferred out of a position
    event Transfer(
        address indexed position, address indexed caller, address indexed target, address asset, uint256 amount
    );
    /// @notice Approval was granted for assets belonging to a position
    event Approve(
        address indexed position, address indexed caller, address indexed spender, address asset, uint256 amount
    );

    /// @notice The pool a position is trying to borrow from does not exist
    error PositionManager_UnknownPool(uint256 poolId);
    /// @notice Unknown spenders cannot be granted approval to position assets
    error PositionManager_UnknownSpender(address spender);
    /// @notice Position health check failed
    error PositionManager_HealthCheckFailed(address position);
    /// @notice Attempt to add unrecognized asset to a position's asset list
    error PositionManager_AddUnknownToken(address asset);
    /// @notice Attempt to approve unknown asset
    error PositionManager_ApproveUnknownAsset(address asset);
    /// @notice Attempt to deposit unrecognized asset to position
    error PositionManager_DepositUnknownAsset(address asset);
    /// @notice Attempt to transfer unrecognized asset out of position
    error PositionManager_TransferUnknownAsset(address asset);
    /// @notice Cannot liquidate healthy position
    error PositionManager_LiquidateHealthyPosition(address position);
    /// @notice Function access restricted to position owner only
    error PositionManager_OnlyPositionOwner(address position, address sender);
    /// @notice Unknown target-function selector pair
    error PositionManager_UnknownFuncSelector(address target, bytes4 selector);
    /// @notice Function access restricted to authorozied addresses
    error PositionManager_OnlyPositionAuthorized(address position, address sender);
    /// @notice Predicted position address does not match with deployed address
    error PositionManager_PredictedPositionMismatch(address position, address predicted);

    constructor() {
        _disableInitializers();
    }

    /// @notice Initializer for TransparentUpgradeableProxy
    /// @param owner_ PositionManager Owner
    /// @param registry_ Sentiment Registry
    function initialize(address owner_, address registry_) public initializer {
        ReentrancyGuardUpgradeable.__ReentrancyGuard_init();
        OwnableUpgradeable.__Ownable_init();
        PausableUpgradeable.__Pausable_init();
        _transferOwnership(owner_);

        registry = Registry(registry_);
    }

    /// @notice Fetch and update module addreses from the registry
    function updateFromRegistry() public {
        pool = Pool(registry.addressFor(SENTIMENT_POOL_KEY));
        riskEngine = RiskEngine(registry.addressFor(SENTIMENT_RISK_ENGINE_KEY));
        positionBeacon = registry.addressFor(SENTIMENT_POSITION_BEACON_KEY);
        emit PoolSet(address(pool));
        emit RiskEngineSet(address(riskEngine));
        emit BeaconSet(positionBeacon);
    }

    /// @notice Toggle pause state of the PositionManager
    function togglePause() external onlyOwner {
        if (PausableUpgradeable.paused()) PausableUpgradeable._unpause();
        else PausableUpgradeable._pause();
    }

    /// @notice Authorize a caller other than the owner to operate on a position
    function toggleAuth(address user, address position) external {
        // only account owners are allowed to modify authorizations
        // disables transitive auth operations
        if (msg.sender != ownerOf[position]) revert PositionManager_OnlyPositionOwner(position, msg.sender);

        // update authz status in storage
        isAuth[position][user] = !isAuth[position][user];
        emit AuthToggled(position, user, isAuth[position][user]);
    }

    /// @notice Process a single action on a given position
    /// @param position Position address
    /// @param action Action config
    function process(address position, Action calldata action) external nonReentrant {
        _process(position, action);
        if (riskEngine.getPositionHealthFactor(position) < WAD) revert PositionManager_HealthCheckFailed(position);
    }

    /// @notice Procces a batch of actions on a given position
    /// @dev only one position can be operated on in one txn, including creation
    /// @param position Position address
    /// @param actions List of actions to process
    function processBatch(address position, Action[] calldata actions) external nonReentrant {
        // loop over actions and process them sequentially based on operation
        uint256 actionsLength = actions.length;
        for (uint256 i; i < actionsLength; ++i) {
            _process(position, actions[i]);
        }
        // after all the actions are processed, the position should be within risk thresholds
        if (riskEngine.getPositionHealthFactor(position) < WAD) revert PositionManager_HealthCheckFailed(position);
    }

    function _process(address position, Action calldata action) internal {
        if (action.op == Operation.NewPosition) {
            newPosition(position, action.data);
            return;
        }

        if (!isAuth[position][msg.sender]) revert PositionManager_OnlyPositionAuthorized(position, msg.sender);

        if (action.op == Operation.Exec) exec(position, action.data);
        else if (action.op == Operation.Transfer) transfer(position, action.data);
        else if (action.op == Operation.Deposit) deposit(position, action.data);
        else if (action.op == Operation.Approve) approve(position, action.data);
        else if (action.op == Operation.Repay) repay(position, action.data);
        else if (action.op == Operation.Borrow) borrow(position, action.data);
        else if (action.op == Operation.AddToken) addToken(position, action.data);
        else if (action.op == Operation.RemoveToken) removeToken(position, action.data);
    }

    /// @dev deterministically deploy a new beacon proxy representing a position
    /// @dev the target field in the action is the new owner of the position
    function newPosition(address predictedAddress, bytes calldata data) internal whenNotPaused {
        // data -> abi.encodePacked(address, bytes32)
        // owner -> [:20] owner to create the position on behalf of
        // salt -> [20:52] create2 salt for position
        address owner = address(bytes20(data[0:20]));
        bytes32 salt = bytes32(data[20:52]);

        // hash salt with owner to mitigate positions being frontrun
        salt = keccak256(abi.encodePacked(owner, salt));
        // create2 a new position as a beacon proxy
        address position = address(new BeaconProxy{ salt: salt }(positionBeacon, ""));
        // update position owner
        ownerOf[position] = owner;
        // owner is authzd by default
        isAuth[position][owner] = true;
        // revert if predicted position address does not match deployed address
        if (position != predictedAddress) revert PositionManager_PredictedPositionMismatch(position, predictedAddress);
        emit PositionDeployed(position, msg.sender, owner);
    }

    /// @dev Operate on a position by interaction with external contracts using arbitrary calldata
    function exec(address position, bytes calldata data) internal whenNotPaused {
        // exec data is encodePacked (address, uint256, bytes)
        // target -> [0:20] contract address to be called by the position
        // value -> [20:52] the ether amount to be sent with the call
        // function selector -> [52:56] function selector to be called on the target
        // calldata -> [52:] represents the calldata including the func selector

        address target = address(bytes20(data[:20]));
        uint256 value = uint256(bytes32(data[20:52]));
        bytes4 funcSelector = bytes4(data[52:56]);

        if (!isKnownFunc[target][funcSelector]) revert PositionManager_UnknownFuncSelector(target, funcSelector);

        Position(payable(position)).exec(target, value, data[52:]);
        emit Exec(position, msg.sender, target, funcSelector);
    }

    /// @dev Transfer assets out of a position
    function transfer(address position, bytes calldata data) internal whenNotPaused {
        // data -> abi.encodePacked(address, address, uint256)
        // recipient -> [0:20] address that will receive the transferred tokens
        // asset -> [20:40] address of token to be transferred
        // amt -> [40:72] amount of asset to be transferred
        address recipient = address(bytes20(data[0:20]));
        address asset = address(bytes20(data[20:40]));
        uint256 amt = uint256(bytes32(data[40:72]));

        if (!isKnownAsset[asset]) revert PositionManager_TransferUnknownAsset(asset);

        // if the passed amt is type(uint).max assume transfer of the entire balance
        if (amt == type(uint256).max) amt = IERC20(asset).balanceOf(position);

        Position(payable(position)).transfer(recipient, asset, amt);
        emit Transfer(position, msg.sender, recipient, asset, amt);
    }

    /// @dev Deposit assets from msg.sender to a position
    function deposit(address position, bytes calldata data) internal {
        // data -> abi.encodePacked(address, uint256)
        // asset -> [0:20] address of token to be deposited
        // amt -> [20: 52] amount of asset to be deposited
        address asset = address(bytes20(data[0:20]));
        uint256 amt = uint256(bytes32(data[20:52]));

        // mitigate unknown assets being locked in positions
        if (!isKnownAsset[asset]) revert PositionManager_DepositUnknownAsset(asset);

        IERC20(asset).safeTransferFrom(msg.sender, position, amt);
        emit Deposit(position, msg.sender, asset, amt);
    }

    /// @dev Approve a spender to use assets from a position
    function approve(address position, bytes calldata data) internal {
        // data -> abi.encodePacked(address, address, uint256)
        // spender -> [0:20] address to be approved
        // asset -> [20:40] address of token to be approves
        // amt -> [40:72] amount of asset to be approved
        address spender = address(bytes20(data[0:20]));
        address asset = address(bytes20(data[20:40]));
        uint256 amt = uint256(bytes32(data[40:72]));

        if (!isKnownAsset[asset]) revert PositionManager_ApproveUnknownAsset(asset);
        if (!isKnownSpender[spender]) revert PositionManager_UnknownSpender(spender);

        // if the passed amt is type(uint).max assume approval of the entire balance
        if (amt == type(uint256).max) amt = IERC20(asset).balanceOf(position);

        Position(payable(position)).approve(asset, spender, amt);
        emit Approve(position, msg.sender, spender, asset, amt);
    }

    /// @dev Decrease position debt via repayment. To repay the entire debt set `_amt` to uint.max
    function repay(address position, bytes calldata data) internal {
        // data -> abi.encodePacked(uint256, uint256)
        // poolId -> [0:32] pool that recieves the repaid debt
        // amt -> [32: 64] notional amount to be repaid
        uint256 poolId = uint256(bytes32(data[0:32]));
        uint256 amt = uint256(bytes32(data[32:64]));

        // if the passed amt is type(uint).max assume repayment of the entire debt
        if (amt == type(uint256).max) amt = pool.getBorrowsOf(poolId, position);

        // transfer assets to be repaid from the position to the given pool
        Position(payable(position)).transfer(address(pool), pool.getPoolAssetFor(poolId), amt);

        // trigger pool repayment which assumes successful transfer of repaid assets
        pool.repay(poolId, position, amt);

        // signals repayment to the position and removes the debt pool if completely paid off
        // any checks needed to validate repayment must be implemented in the position
        Position(payable(position)).repay(poolId, amt);
        emit Repay(position, msg.sender, poolId, amt);
    }

    /// @dev Increase position debt via borrowing
    function borrow(address position, bytes calldata data) internal whenNotPaused {
        // data -> abi.encodePacked(uint256, uint256)
        // poolId -> [0:32] pool to borrow from
        // amt -> [32:64] notional amount to be borrowed
        uint256 poolId = uint256(bytes32(data[0:32]));
        uint256 amt = uint256(bytes32(data[32:64]));

        // revert if the given pool does not exist
        if (pool.ownerOf(poolId) == address(0)) revert PositionManager_UnknownPool(poolId);

        // transfer borrowed assets from given pool to position
        // trigger pool borrow and increase debt owed by the position
        pool.borrow(poolId, position, amt);

        // signals a borrow operation without any actual transfer of borrowed assets
        // any checks needed to validate the borrow must be implemented in the position
        Position(payable(position)).borrow(poolId, amt);
        emit Borrow(position, msg.sender, poolId, amt);
    }

    /// @dev Add a token address to the set of position assets
    function addToken(address position, bytes calldata data) internal {
        // data -> abi.encodePacked(address)
        // asset -> [0:20] address of asset to be registered as collateral
        address asset = address(bytes20(data[0:20]));

        // avoid interactions with unknown assets
        if (!isKnownAsset[asset]) revert PositionManager_AddUnknownToken(asset);

        Position(payable(position)).addToken(asset); // validation should be in the position contract
        emit AddToken(position, msg.sender, asset);
    }

    /// @dev Remove a token address from the set of position assets
    function removeToken(address position, bytes calldata data) internal whenNotPaused {
        // data -> abi.encodePacked(address)
        // asset -> address of asset to be deregistered as collateral
        address asset = address(bytes20(data[0:20]));
        Position(payable(position)).removeToken(asset);
        emit RemoveToken(position, msg.sender, asset);
    }

    /// @notice Liquidate an unhealthy position
    /// @param position Position address
    /// @param debtData DebtData object for debts to be repaid
    /// @param assetData AssetData object for assets to be seized
    /// @dev DebtData must be sorted by poolId, AssetData must be sorted by asset (ascending)
    function liquidate(
        address position,
        DebtData[] calldata debtData,
        AssetData[] calldata assetData
    )
        external
        nonReentrant
    {
        (uint256 prevHealthFactor, uint256 liqFee, DebtData[] memory repayData, AssetData[] memory seizeData) =
            riskEngine.validateLiquidation(position, debtData, assetData);

        // liquidate
        _transferAssetsToLiquidator(position, liqFee, seizeData);
        _repayPositionDebt(position, repayData);

        // verify that position health improves
        uint256 healthFactor = riskEngine.getPositionHealthFactor(position);
        if (healthFactor <= prevHealthFactor) revert PositionManager_HealthCheckFailed(position);

        emit Liquidation(position, msg.sender, ownerOf[position]);
    }

    /// @notice Liquidate a position with bad debt
    /// @dev Bad debt positions cannot be liquidated partially
    function liquidateBadDebt(address position, DebtData[] calldata debtData) external nonReentrant {
        (DebtData[] memory repayData, AssetData[] memory seizeData) =
            riskEngine.validateBadDebtLiquidation(position, debtData);

        // liquidator repays some of the bad debt, and receives all of the position assets
        _transferAssetsToLiquidator(position, BAD_DEBT_LIQUIDATION_FEE, seizeData); // zero protocol fee
        _repayPositionDebt(position, repayData);

        // settle remaining bad debt for the given position
        uint256[] memory debtPools = Position(payable(position)).getDebtPools();
        uint256 debtPoolsLength = debtPools.length;
        for (uint256 i; i < debtPoolsLength; ++i) {
            pool.rebalanceBadDebt(debtPools[i], position);
            Position(payable(position)).repay(debtPools[i], type(uint256).max);
        }
    }

    function _transferAssetsToLiquidator(
        address position,
        uint256 liquidationFee,
        AssetData[] memory assetData
    )
        internal
    {
        // transfer position assets to the liquidator and accrue protocol liquidation fees
        uint256 assetDataLength = assetData.length;
        for (uint256 i; i < assetDataLength; ++i) {
            uint256 feeAssets;
            if (liquidationFee > 0) {
                feeAssets = liquidationFee.mulDiv(assetData[i].amt, WAD); // compute fee assets
                Position(payable(position)).transfer(owner(), assetData[i].asset, feeAssets); // transfer fee assets
            }
            // transfer assets to the liquidator
            Position(payable(position)).transfer(msg.sender, assetData[i].asset, assetData[i].amt - feeAssets);
        }
    }

    function _repayPositionDebt(address position, DebtData[] memory debtData) internal {
        // sequentially repay position debts
        // assumes the position manager is approved to pull assets from the liquidator
        uint256 debtDataLength = debtData.length;
        for (uint256 i; i < debtDataLength; ++i) {
            uint256 poolId = debtData[i].poolId;
            address poolAsset = pool.getPoolAssetFor(poolId);
            uint256 amt = debtData[i].amt;
            // transfer debt asset from the liquidator to the pool
            IERC20(poolAsset).safeTransferFrom(msg.sender, address(pool), amt);
            // trigger pool repayment which assumes successful transfer of repaid assets
            pool.repay(poolId, position, amt);
            // update position to reflect repayment of debt by liquidator
            Position(payable(position)).repay(poolId, amt);
        }
    }

    /// @notice Set the protocol registry address
    function setRegistry(address _registry) external onlyOwner {
        registry = Registry(_registry);
        updateFromRegistry();
        emit RegistrySet(_registry);
    }

    /// @notice Toggle asset inclusion in the known asset universe
    function toggleKnownAsset(address asset) external onlyOwner {
        isKnownAsset[asset] = !isKnownAsset[asset];
        emit ToggleKnownAsset(asset, isKnownAsset[asset]);
    }

    /// @notice Toggle spender inclusion in the known spender universe
    function toggleKnownSpender(address spender) external onlyOwner {
        isKnownSpender[spender] = !isKnownSpender[spender];
        emit ToggleKnownSpender(spender, isKnownSpender[spender]);
    }

    /// @notice Toggle target-function pair inclusion in the known function universe
    function toggleKnownFunc(address target, bytes4 method) external onlyOwner {
        isKnownFunc[target][method] = !isKnownFunc[target][method];
        emit ToggleKnownFunc(target, method, isKnownFunc[target][method]);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/*//////////////////////////////////////////////////////////////
                            Registry
//////////////////////////////////////////////////////////////*/

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/// @title Registry
contract Registry is Ownable {
    /// @notice Registry address for a given key hash updated
    event AddressSet(bytes32 indexed key, address addr);
    /// @notice Rate model address for a given key hash updated
    event RateModelSet(bytes32 indexed key, address addr);

    /// @notice Fetch module address for a given key hash
    mapping(bytes32 key => address addr) public addressFor;
    /// @notice Fetch rate model address for a given key hash
    mapping(bytes32 key => address rateModel) public rateModelFor;

    constructor() Ownable() { }

    /// @notice Update module address for a given key hash
    /// @param key Registry key hash
    /// @param addr Updated module address for the key hash
    function setAddress(bytes32 key, address addr) external onlyOwner {
        addressFor[key] = addr;
        emit AddressSet(key, addr);
    }

    /// @notice Update rate model address for a given key hash
    /// @param key Registry key hash
    /// @param rateModel Updated rate model address for the key hash
    function setRateModel(bytes32 key, address rateModel) external onlyOwner {
        rateModelFor[key] = rateModel;
        emit RateModelSet(key, rateModel);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

// types
import { Pool } from "./Pool.sol";
import { Position } from "./Position.sol";
import { AssetData, DebtData } from "./PositionManager.sol";
import { Registry } from "./Registry.sol";
import { RiskEngine } from "./RiskEngine.sol";
import { IOracle } from "./interfaces/IOracle.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

// libraries
import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";

/// @title RiskModule
contract RiskModule {
    using Math for uint256;

    uint256 internal constant WAD = 1e18;
    /// @notice Sentiment Registry Pool registry key hash
    /// @dev keccak(SENTIMENT_POOL_KEY)
    bytes32 public constant SENTIMENT_POOL_KEY = 0x1a99cbf6006db18a0e08427ff11db78f3ea1054bc5b9d48122aae8d206c09728;
    /// @notice Sentiment Risk Engine registry key hash
    /// @dev keccak(SENTIMENT_RISK_ENGINE_KEY)
    bytes32 public constant SENTIMENT_RISK_ENGINE_KEY =
        0x5b6696788621a5d6b5e3b02a69896b9dd824ebf1631584f038a393c29b6d7555;

    /// @notice Protocol liquidation fee, out of 1e18
    uint256 public immutable LIQUIDATION_FEE;
    /// @notice The discount on assets when liquidating, out of 1e18
    uint256 public immutable LIQUIDATION_DISCOUNT;
    /// @notice The updateable registry as a part of the 2step initialization process
    Registry public immutable REGISTRY;
    /// @notice Sentiment Singleton Pool
    Pool public pool;
    /// @notice Sentiment Risk Engine
    RiskEngine public riskEngine;

    /// @notice Pool address was updated
    event PoolSet(address pool);
    /// @notice Risk Engine address was updated
    event RiskEngineSet(address riskEngine);

    /// @notice Value of assets seized by the liquidator exceeds liquidation discount
    error RiskModule_SeizedTooMuch(uint256 seizedValue, uint256 maxSeizedValue);
    /// @notice Position contains an asset that is not supported by a pool that it borrows from
    error RiskModule_UnsupportedAsset(address position, uint256 poolId, address asset);
    /// @notice Minimum assets required in a position with non-zero debt cannot be zero
    error RiskModule_ZeroMinReqAssets();
    /// @notice Cannot liquidate healthy positions
    error RiskModule_LiquidateHealthyPosition(address position);
    /// @notice Position does not have any bad debt
    error RiskModule_NoBadDebt(address position);
    /// @notice Seized asset does not belong to to the position's asset list
    error RiskModule_SeizeInvalidAsset(address position, address asset);
    /// @notice Liquidation DebtData is invalid
    error RiskModule_InvalidDebtData(uint256 poolId);
    /// @notice Liquidation AssetData is invalid
    error RiskModule_InvalidAssetData(address asset);

    /// @notice Constructor for Risk Module, which should be registered with the RiskEngine
    /// @param registry_ The address of the registry contract
    /// @param liquidationDiscount_ The discount on assets when liquidating, out of 1e18
    constructor(address registry_, uint256 liquidationDiscount_, uint256 liquidationFee_) {
        REGISTRY = Registry(registry_);
        LIQUIDATION_DISCOUNT = liquidationDiscount_;
        LIQUIDATION_FEE = liquidationFee_;
    }

    /// @notice Updates the pool and risk engine from the registry
    function updateFromRegistry() external {
        pool = Pool(REGISTRY.addressFor(SENTIMENT_POOL_KEY));
        riskEngine = RiskEngine(REGISTRY.addressFor(SENTIMENT_RISK_ENGINE_KEY));
        emit PoolSet(address(pool));
        emit RiskEngineSet(address(riskEngine));
    }

    /// @notice Fetch position health factor
    function getPositionHealthFactor(address position) public view returns (uint256) {
        // a position can have multiple states:
        // 1. (zero debt, zero assets) -> max health
        // 2. (zero debt, non-zero assets) -> max health
        // 3. (non-zero debt, zero assets) -> invalid state, zero health
        // 4. (non-zero debt, non-zero assets) AND (debt > assets) -> bad debt, zero health
        // 5. (non-zero debt, non-zero assets) AND (assets >= debt) -> determined by weighted ltv

        (uint256 totalAssets, uint256 totalDebt, uint256 weightedLtv) = getRiskData(position);
        if (totalDebt == 0) return type(uint256).max; // (zero debt, zero assets) AND (zero debt, non-zero assets)
        if (totalDebt > totalAssets) return 0; // (non-zero debt, zero assets) AND bad debt
        return weightedLtv.mulDiv(totalAssets, totalDebt); // (non-zero debt, non-zero assets) AND no bad debt
    }

    /// @notice Fetch risk data for a position - total assets and debt in ETH, and its weighted LTV
    /// @dev weightedLtv is zero if either total assets or total debt is zero
    function getRiskData(address position) public view returns (uint256, uint256, uint256) {
        (uint256 totalDebt, uint256[] memory debtPools, uint256[] memory debtValue) = getDebtData(position);
        (uint256 totalAssets, address[] memory positionAssets, uint256[] memory assetValue) = getAssetData(position);
        uint256 weightedLtv =
            _getWeightedLtv(position, totalDebt, debtPools, debtValue, totalAssets, positionAssets, assetValue);
        return (totalAssets, totalDebt, weightedLtv);
    }

    /// @notice Fetch debt data for position - total debt in ETH, active debt pools, and debt for each pool in ETH
    function getDebtData(address position) public view returns (uint256, uint256[] memory, uint256[] memory) {
        uint256 totalDebt;
        uint256[] memory debtPools = Position(payable(position)).getDebtPools();
        uint256[] memory debtValue = new uint256[](debtPools.length);

        uint256 debtPoolsLength = debtPools.length;
        for (uint256 i; i < debtPoolsLength; ++i) {
            address poolAsset = pool.getPoolAssetFor(debtPools[i]);
            uint256 borrowAmt = pool.getBorrowsOf(debtPools[i], position);
            uint256 debtInEth = riskEngine.getValueInEth(poolAsset, borrowAmt);
            debtValue[i] = debtInEth;
            totalDebt += debtInEth;
        }
        return (totalDebt, debtPools, debtValue);
    }

    /// @notice Fetch asset data for a position - total assets in ETH, position assets, and value of each asset in ETH
    function getAssetData(address position) public view returns (uint256, address[] memory, uint256[] memory) {
        uint256 totalAssets;
        address[] memory positionAssets = Position(payable(position)).getPositionAssets();
        uint256 positionAssetsLength = positionAssets.length;
        uint256[] memory assetValue = new uint256[](positionAssetsLength);

        for (uint256 i; i < positionAssetsLength; ++i) {
            uint256 amt = IERC20(positionAssets[i]).balanceOf(position);
            uint256 assetsInEth = riskEngine.getValueInEth(positionAssets[i], amt);
            assetValue[i] = assetsInEth;
            totalAssets += assetsInEth;
        }
        return (totalAssets, positionAssets, assetValue);
    }

    /// @notice Fetch weighted Ltv for a position
    function getWeightedLtv(address position) public view returns (uint256) {
        (uint256 totalDebt, uint256[] memory debtPools, uint256[] memory debtValue) = getDebtData(position);
        (uint256 totalAssets, address[] memory positionAssets, uint256[] memory assetValue) = getAssetData(position);
        return _getWeightedLtv(position, totalDebt, debtPools, debtValue, totalAssets, positionAssets, assetValue);
    }

    function _getWeightedLtv(
        address position,
        uint256 totalDebt,
        uint256[] memory debtPools,
        uint256[] memory debtValue,
        uint256 totalAssets,
        address[] memory positionAssets,
        uint256[] memory assetValue
    )
        internal
        view
        returns (uint256 weightedLtv)
    {
        // handle empty, zero-debt, bad debt, and invalid position states
        if (totalDebt == 0 || totalAssets == 0 || totalDebt > totalAssets) return 0;

        uint256 debtPoolsLen = debtPools.length;
        uint256 positionAssetsLen = positionAssets.length;
        // O(debtPools.length * positionAssets.length)
        for (uint256 i; i < debtPoolsLen; ++i) {
            for (uint256 j; j < positionAssetsLen; ++j) {
                uint256 ltv = riskEngine.ltvFor(debtPools[i], positionAssets[j]);
                // every position asset must have a non-zero ltv in every debt pool
                if (ltv == 0) revert RiskModule_UnsupportedAsset(position, debtPools[i], positionAssets[j]);
                // ltv is weighted over two dimensions - proportion of debt value owed to a pool as a share of the
                // total position debt and proportion of position asset value as a share of total position value
                weightedLtv += debtValue[i].mulDiv(assetValue[j], WAD).mulDiv(ltv, WAD);
            }
        }
        weightedLtv = weightedLtv.mulDiv(WAD, totalAssets).mulDiv(WAD, totalDebt);
    }

    /// @notice Used to validate liquidator data and value of assets seized
    /// @param position Position being liquidated
    /// @param debtData The debt data for the position
    /// @param assetData The asset data for the position
    function validateLiquidation(
        address position,
        DebtData[] calldata debtData,
        AssetData[] calldata assetData
    )
        external
        view
        returns (uint256, uint256, DebtData[] memory, AssetData[] memory)
    {
        // ensure position is unhealthy
        uint256 healthFactor = getPositionHealthFactor(position);
        if (healthFactor >= WAD) revert RiskModule_LiquidateHealthyPosition(position);

        // parse data for repayment and seizure
        (uint256 totalRepayValue, DebtData[] memory repayData) = _getRepayData(position, debtData);
        (uint256 totalSeizeValue, AssetData[] memory seizeData) = _getSeizeData(position, assetData);

        // verify liquidator does not seize too much
        uint256 maxSeizeValue = totalRepayValue.mulDiv(1e18, (1e18 - LIQUIDATION_DISCOUNT));
        if (totalSeizeValue > maxSeizeValue) revert RiskModule_SeizedTooMuch(totalSeizeValue, maxSeizeValue);

        // compute protocol liquidation fee as a portion of liquidator profit, if any
        uint256 liqFee;
        if (totalSeizeValue > totalRepayValue) {
            liqFee = (totalSeizeValue - totalRepayValue).mulDiv(LIQUIDATION_FEE, totalSeizeValue);
        }

        return (healthFactor, liqFee, repayData, seizeData);
    }

    /// @notice validate bad debt liquidation call
    /// @dev Positions with bad debt cannot be partially liquidated
    function validateBadDebtLiquidation(
        address position,
        DebtData[] calldata debtData
    )
        external
        view
        returns (DebtData[] memory, AssetData[] memory)
    {
        // verify position has bad debt
        (uint256 totalAssetValue, uint256 totalDebtValue,) = getRiskData(position);
        if (totalAssetValue >= totalDebtValue) revert RiskModule_NoBadDebt(position);

        // parse repayment data
        (uint256 totalRepayValue, DebtData[] memory repayData) = _getRepayData(position, debtData);

        // verify that liquidator repays enough to seize all position assets
        uint256 maxSeizeValue = totalRepayValue.mulDiv(1e18, (1e18 - LIQUIDATION_DISCOUNT));
        if (totalAssetValue > maxSeizeValue) revert RiskModule_SeizedTooMuch(totalAssetValue, maxSeizeValue);

        // generate asset seizure data - since bad debt liquidations are not partial, all assets are seized
        AssetData[] memory seizeData = _getBadDebtSeizeData(position);

        return (repayData, seizeData);
    }

    function _getRepayData(
        address position,
        DebtData[] calldata debtData
    )
        internal
        view
        returns (uint256 totalRepayValue, DebtData[] memory repayData)
    {
        _validateDebtData(position, debtData);
        uint256 debtDataLen = debtData.length;
        repayData = debtData; // copy debtData and replace all type(uint).max with repay amounts
        for (uint256 i; i < debtDataLen; ++i) {
            uint256 poolId = repayData[i].poolId;
            uint256 repayAmt = repayData[i].amt;
            if (repayAmt == type(uint256).max) {
                repayAmt = pool.getBorrowsOf(poolId, position);
                repayData[i].amt = repayAmt;
            }
            totalRepayValue += riskEngine.getValueInEth(pool.getPoolAssetFor(poolId), repayAmt);
        }
    }

    function _getSeizeData(
        address position,
        AssetData[] calldata assetData
    )
        internal
        view
        returns (uint256 totalSeizeValue, AssetData[] memory seizeData)
    {
        _validateAssetData(position, assetData);
        uint256 assetDataLen = assetData.length;
        seizeData = assetData; // copy assetData and replace all type(uint).max with position asset balances
        for (uint256 i; i < assetDataLen; ++i) {
            address asset = seizeData[i].asset;
            // ensure assetData[i] is in the position asset list
            if (Position(payable(position)).hasAsset(asset) == false) {
                revert RiskModule_SeizeInvalidAsset(position, asset);
            }
            uint256 seizeAmt = seizeData[i].amt;
            if (seizeAmt == type(uint256).max) {
                seizeAmt = IERC20(asset).balanceOf(position);
                seizeData[i].amt = seizeAmt;
            }
            totalSeizeValue += riskEngine.getValueInEth(asset, seizeAmt);
        }
    }

    // since bad debt liquidations cannot be partial, all position assets are seized
    function _getBadDebtSeizeData(address position) internal view returns (AssetData[] memory) {
        address[] memory positionAssets = Position(payable(position)).getPositionAssets();
        uint256 positionAssetsLength = positionAssets.length;
        AssetData[] memory seizeData = new AssetData[](positionAssets.length);

        for (uint256 i; i < positionAssetsLength; ++i) {
            address asset = positionAssets[i];
            uint256 amt = IERC20(positionAssets[i]).balanceOf(position);
            seizeData[i] = AssetData({ asset: asset, amt: amt });
        }
        return seizeData;
    }

    // ensure DebtData has no duplicates by enforcing an ascending order of poolIds
    // ensure repaid pools are in the debt array for the position
    function _validateDebtData(address position, DebtData[] memory debtData) internal view {
        uint256 debtDataLen = debtData.length;
        if (debtDataLen == 0) return;

        uint256 lastPoolId = debtData[0].poolId;
        if (Position(payable(position)).hasDebt(lastPoolId) == false) revert RiskModule_InvalidDebtData(lastPoolId);

        for (uint256 i = 1; i < debtDataLen; ++i) {
            uint256 poolId = debtData[i].poolId;
            if (poolId <= lastPoolId) revert RiskModule_InvalidDebtData(poolId);
            if (Position(payable(position)).hasDebt(poolId) == false) revert RiskModule_InvalidDebtData(poolId);
            lastPoolId = poolId;
        }
    }

    // ensure assetData has no duplicates by enforcing an ascending order of assets
    // ensure seized assets are in the assets array for the position
    function _validateAssetData(address position, AssetData[] memory assetData) internal view {
        uint256 assetDataLen = assetData.length;
        if (assetDataLen == 0) return;

        address lastAsset = assetData[0].asset;
        if (Position(payable(position)).hasAsset(lastAsset) == false) revert RiskModule_InvalidAssetData(lastAsset);

        for (uint256 i = 1; i < assetDataLen; ++i) {
            address asset = assetData[i].asset;
            if (asset <= lastAsset) revert RiskModule_InvalidAssetData(asset);
            if (Position(payable(position)).hasAsset(asset) == false) revert RiskModule_InvalidAssetData(asset);
            lastAsset = asset;
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/*//////////////////////////////////////////////////////////////
                            IOracle
//////////////////////////////////////////////////////////////*/

/// @title IOracle
/// @notice Common interface for all oracle implementations
interface IOracle {
    /// @notice Compute the equivalent ETH value for a given amount of a particular asset
    /// @param asset Address of the asset to be priced
    /// @param amt Amount of the given asset to be priced
    /// @return valueInEth Equivalent ETH value for the given asset and amount, scaled by 18 decimals
    function getValueInEth(address asset, uint256 amt) external view returns (uint256 valueInEth);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/*//////////////////////////////////////////////////////////////
                            IRateModel
//////////////////////////////////////////////////////////////*/

/// @title IRateModel
/// @notice Common interface for all rate model implementations
interface IRateModel {
    /// @notice Compute the amount of interest accrued since the last interest update
    /// @param lastUpdated Timestamp of the last interest update
    /// @param totalBorrows Total amount of assets borrowed from the pool
    /// @param totalAssets Total amount of assets controlled by the pool
    /// @return interestAccrued Amount of interest accrued since the last interest update
    ///         denominated in terms of the given asset
    function getInterestAccrued(
        uint256 lastUpdated,
        uint256 totalBorrows,
        uint256 totalAssets
    )
        external
        view
        returns (uint256 interestAccrued);

    /// @notice Fetch the instantaneous borrow interest rate for a given pool state
    /// @param totalBorrows Total amount of assets borrowed from the pool
    /// @param totalAssets Total amount of assets controlled by the pool
    /// @return interestRate Instantaneous interest rate for the given pool state, scaled by 18 decimals
    function getInterestRate(uint256 totalBorrows, uint256 totalAssets) external view returns (uint256 interestRate);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

/// @title ERC6909
/// @notice Minimalist and gas efficient standard ERC6909 implementation.
/// @dev Forked from solmate with modified approval flows
abstract contract ERC6909 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event OperatorSet(address indexed owner, address indexed operator, bool approved);

    event Approval(address indexed owner, address indexed spender, uint256 indexed id, uint256 amount);

    event Transfer(address caller, address indexed from, address indexed to, uint256 indexed id, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                             ERC6909 STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(address owner => mapping(address operator => bool operatorStatus)) public isOperator;

    mapping(address owner => mapping(uint256 id => uint256 balance)) public balanceOf;

    mapping(address owner => mapping(address spender => mapping(uint256 id => uint256 allowance))) public allowance;

    /*//////////////////////////////////////////////////////////////
                              ERC6909 LOGIC
    //////////////////////////////////////////////////////////////*/

    function transfer(address receiver, uint256 id, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender][id] -= amount;

        balanceOf[receiver][id] += amount;

        emit Transfer(msg.sender, msg.sender, receiver, id, amount);

        return true;
    }

    function transferFrom(address sender, address receiver, uint256 id, uint256 amount) public virtual returns (bool) {
        if (msg.sender != sender && !isOperator[sender][msg.sender]) {
            uint256 allowed = allowance[sender][msg.sender][id];
            if (allowed != type(uint256).max) allowance[sender][msg.sender][id] = allowed - amount;
        }

        balanceOf[sender][id] -= amount;

        balanceOf[receiver][id] += amount;

        emit Transfer(msg.sender, sender, receiver, id, amount);

        return true;
    }

    function approve(address spender, uint256 id, uint256 amount) public virtual returns (bool) {
        _approve(spender, id, amount);

        return true;
    }

    function increaseAllowance(address spender, uint256 id, uint256 value) public virtual returns (bool) {
        _approve(spender, id, allowance[msg.sender][spender][id] + value);

        return true;
    }

    function decreaseAllowance(address spender, uint256 id, uint256 value) public virtual returns (bool) {
        _approve(spender, id, allowance[msg.sender][spender][id] - value);

        return true;
    }

    function setOperator(address operator, bool approved) public virtual returns (bool) {
        isOperator[msg.sender][operator] = approved;

        emit OperatorSet(msg.sender, operator, approved);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == 0x01ffc9a7 // ERC165 Interface ID for ERC165
            || interfaceId == 0x0f632fb3; // ERC165 Interface ID for ERC6909
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address receiver, uint256 id, uint256 amount) internal virtual {
        balanceOf[receiver][id] += amount;

        emit Transfer(msg.sender, address(0), receiver, id, amount);
    }

    function _burn(address sender, uint256 id, uint256 amount) internal virtual {
        balanceOf[sender][id] -= amount;

        emit Transfer(msg.sender, sender, address(0), id, amount);
    }

    function _approve(address spender, uint256 id, uint256 amount) internal virtual {
        allowance[msg.sender][spender][id] = amount;

        emit Approval(msg.sender, spender, id, amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/*//////////////////////////////////////////////////////////////
                            IterableSet
//////////////////////////////////////////////////////////////*/

/// @title IterableSet
/// @notice Iterable set library for address and uint256 types
library IterableSet {
    /*//////////////////////////////////////////////////////////////
                             Address Set
    //////////////////////////////////////////////////////////////*/

    /// @title AddressSet
    /// @notice Storage struct for iterable address set
    struct AddressSet {
        address[] elements; // list of elements in the set
        // idxOf indexing scheme:
        // idxOf[element] = index of key in self.elements + 1 OR in other words
        // idxOf[element] = one-indexed location of a particular element in self.elements
        // idxOf[element] = 0 denotes that an element is not present in the set
        mapping(address elem => uint256 idx) idxOf;
    }

    /// @notice Check if the set contains a given element
    function contains(AddressSet storage self, address elem) internal view returns (bool) {
        return self.idxOf[elem] > 0; // idxOf[element] = 0 denotes that element is not in the set
    }

    /// @notice Fetch element from set by index
    /// @dev Zero-indexed query to the elements array. Set does not preserve order after removals
    function getByIdx(AddressSet storage self, uint256 idx) internal view returns (address) {
        return self.elements[idx];
    }

    /// @notice Fetch all elements in the set
    /// @dev Set does not preserve order after removals
    function getElements(AddressSet storage self) internal view returns (address[] memory) {
        return self.elements;
    }

    /// @notice Fetch the number of elements in the set
    function length(AddressSet storage self) internal view returns (uint256) {
        return self.elements.length;
    }

    // insertion: the element is pushed to the end of self.elements and idxOf is updated accordingly

    /// @notice Insert an element into the set
    /// @dev No-op if element already exists
    function insert(AddressSet storage self, address elem) internal {
        if (self.idxOf[elem] != 0) return; // no-op if element is already in the set
        self.elements.push(elem);
        self.idxOf[elem] = self.elements.length;
    }

    // removal: replace it with the current last element, update idxOf and call pop()
    // if the element to be removed is the last element, simply update idxOf and call pop()

    /// @notice Remove element from set
    /// @dev No-op if element is not in the set
    function remove(AddressSet storage self, address elem) internal {
        if (self.idxOf[elem] == 0) return; // no-op if element is not in the set

        uint256 toRemoveIdx = self.idxOf[elem] - 1; // idx of element to be removed
        uint256 len = self.elements.length;

        // if element to be removed is not at the end, replace it with the last element
        if (toRemoveIdx != len - 1) {
            address lastElem = self.elements[len - 1];
            self.elements[toRemoveIdx] = lastElem;
            self.idxOf[lastElem] = toRemoveIdx + 1; // idxOf mapping is 1-indexed
        }

        self.idxOf[elem] = 0; // idxOf[elem] = 0 denotes that it is no longer in the set
        self.elements.pop(); // pop self.elements array effectively deleting elem
    }

    /*//////////////////////////////////////////////////////////////
                             Uint256 Set
    //////////////////////////////////////////////////////////////*/

    /// @title Uint256Set
    /// @notice Storage struct for iterable uint256 set
    struct Uint256Set {
        uint256[] elements; // list of elements in the set
        // idxOf indexing scheme:
        // idxOf[element] = index of key in self.elements + 1 OR in other words
        // idxOf[element] = one-indexed location of a particular element in self.elements
        // idxOf[element] = 0, if element is not present in the set
        mapping(uint256 elem => uint256 idx) idxOf;
    }

    /// @notice Check if the set contains a give element
    function contains(Uint256Set storage self, uint256 elem) internal view returns (bool) {
        return self.idxOf[elem] > 0; // idxOf[element] = 0 denotes that element is not in the set
    }

    /// @notice Fetch element from set by index
    /// @dev Zero-indexed query to the elements array. Set does not preserve order after removals
    function getByIdx(Uint256Set storage self, uint256 idx) internal view returns (uint256) {
        return self.elements[idx];
    }

    /// @notice Fetch all elements in the set
    /// @dev Set does not preserve order after removals
    function getElements(Uint256Set storage self) internal view returns (uint256[] memory) {
        return self.elements;
    }

    /// @notice Fetch the number of elements in the set
    function length(Uint256Set storage self) internal view returns (uint256) {
        return self.elements.length;
    }

    // insertion: the element is pushed to the end of self.elements and idxOf is updated accordingly

    /// @notice Insert an element into the set
    /// @dev No-op if element already exists
    function insert(Uint256Set storage self, uint256 elem) internal {
        if (self.idxOf[elem] != 0) return; // no-op if element is already in the set
        self.elements.push(elem);
        self.idxOf[elem] = self.elements.length;
    }

    // removal: replace it with the current last element, update idxOf and call pop()
    // if the element to be removed is the last element, simply update idxOf and call pop()

    /// @notice Remove element from set
    /// @dev No-op if element does not exist
    function remove(Uint256Set storage self, uint256 elem) internal {
        if (self.idxOf[elem] == 0) return; // no-op if element is not in the set

        uint256 toRemoveIdx = self.idxOf[elem] - 1; // idx of element to be removed
        uint256 len = self.elements.length;

        // if element to be removed is not at the end, replace it with the last element
        if (toRemoveIdx != len - 1) {
            uint256 lastElem = self.elements[len - 1];
            self.elements[toRemoveIdx] = lastElem;
            self.idxOf[lastElem] = toRemoveIdx + 1; // idxOf mapping is 1-indexed
        }

        self.idxOf[elem] = 0; // idxOf[elem] = 0 denotes that it is no longer in the set
        self.elements.pop(); // pop self.elements array effectively deleting elem
    }
}

{
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "appendCBOR": false,
    "bytecodeHash": "none",
    "useLiteralContent": false
  },
  "optimizer": {
    "details": {
      "constantOptimizer": true,
      "yul": true,
      "yulDetails": {
        "stackAllocation": true
      }
    },
    "enabled": true,
    "runs": 1024
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "@redstone-oracles-monorepo/=lib/redstone-oracles-monorepo/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "ds-test/=lib/openzeppelin-contracts-upgradeable/lib/forge-std/lib/ds-test/src/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "redstone-oracles-monorepo/=lib/redstone-oracles-monorepo/"
  ],
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"registry_","type":"address"},{"internalType":"uint256","name":"minLtv_","type":"uint256"},{"internalType":"uint256","name":"maxLtv_","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"}],"name":"RiskEngine_CannotBorrowPoolAsset","type":"error"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"}],"name":"RiskEngine_InvalidBasePool","type":"error"},{"inputs":[{"internalType":"uint256","name":"minLtv","type":"uint256"},{"internalType":"uint256","name":"maxLtv","type":"uint256"}],"name":"RiskEngine_InvalidLtvLimits","type":"error"},{"inputs":[{"internalType":"uint256","name":"ltv","type":"uint256"}],"name":"RiskEngine_LtvLimitBreached","type":"error"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"RiskEngine_LtvUpdateExpired","type":"error"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"RiskEngine_LtvUpdateTimelocked","type":"error"},{"inputs":[],"name":"RiskEngine_MaxLtvTooHigh","type":"error"},{"inputs":[],"name":"RiskEngine_MinLtvTooLow","type":"error"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"RiskEngine_NoLtvUpdate","type":"error"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"RiskEngine_NoOracleFound","type":"error"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"sender","type":"address"}],"name":"RiskEngine_OnlyPoolOwner","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"minLtv","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maxLtv","type":"uint256"}],"name":"LtvBoundsSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":false,"internalType":"uint256","name":"ltv","type":"uint256"}],"name":"LtvUpdateAccepted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":true,"internalType":"address","name":"asset","type":"address"}],"name":"LtvUpdateRejected","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"components":[{"internalType":"uint256","name":"ltv","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"}],"indexed":false,"internalType":"struct RiskEngine.LtvUpdate","name":"ltvUpdate","type":"tuple"}],"name":"LtvUpdateRequested","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":false,"internalType":"address","name":"oracle","type":"address"}],"name":"OracleSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolA","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"poolB","type":"uint256"},{"indexed":false,"internalType":"bool","name":"isAllowed","type":"bool"}],"name":"PoolPairToggled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"pool","type":"address"}],"name":"PoolSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"registry","type":"address"}],"name":"RegistrySet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"riskModule","type":"address"}],"name":"RiskModuleSet","type":"event"},{"inputs":[],"name":"SENTIMENT_POOL_KEY","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SENTIMENT_RISK_MODULE_KEY","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TIMELOCK_DEADLINE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TIMELOCK_DURATION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"acceptLtvUpdate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"position","type":"address"}],"name":"getPositionHealthFactor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"position","type":"address"}],"name":"getRiskData","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amt","type":"uint256"}],"name":"getValueInEth","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"poolA","type":"uint256"},{"internalType":"uint256","name":"poolB","type":"uint256"}],"name":"isAllowedPair","outputs":[{"internalType":"bool","name":"isAllowed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"ltvFor","outputs":[{"internalType":"uint256","name":"ltv","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"ltvUpdateFor","outputs":[{"internalType":"uint256","name":"ltv","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxLtv","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minLtv","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"oracleFor","outputs":[{"internalType":"address","name":"oracle","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pool","outputs":[{"internalType":"contract Pool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"contract Registry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"}],"name":"rejectLtvUpdate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"ltv","type":"uint256"}],"name":"requestLtvUpdate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"riskModule","outputs":[{"internalType":"contract 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DebtData[]","name":"debtData","type":"tuple[]"}],"name":"validateBadDebtLiquidation","outputs":[{"components":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"uint256","name":"amt","type":"uint256"}],"internalType":"struct DebtData[]","name":"","type":"tuple[]"},{"components":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amt","type":"uint256"}],"internalType":"struct AssetData[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"position","type":"address"},{"components":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"uint256","name":"amt","type":"uint256"}],"internalType":"struct DebtData[]","name":"debtData","type":"tuple[]"},{"components":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amt","type":"uint256"}],"internalType":"struct AssetData[]","name":"assetData","type":"tuple[]"}],"name":"validateLiquidation","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"components":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"uint256","name":"amt","type":"uint256"}],"internalType":"struct DebtData[]","name":"","type":"tuple[]"},{"components":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amt","type":"uint256"}],"internalType":"struct AssetData[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"}]

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