// SPDX-License-Identifier: SEE LICENSE IN LICENSE
pragma solidity ^0.8.19;

import {IPChainlinkOracleEssential} from "../../interfaces/IPChainlinkOracleEssential.sol";

contract PendleSparkLinearDiscountOracle is IPChainlinkOracleEssential {
    uint256 private constant SECONDS_PER_YEAR = 365 days;
    uint256 private constant ONE = 1e18;

    address public immutable PT;
    uint256 public immutable maturity;
    uint256 public immutable baseDiscountPerYear; // 100% = 1e18

    constructor(address _pt, uint256 _baseDiscountPerYear) {
        require(_baseDiscountPerYear <= 1e18, "invalid discount");
        require(_pt != address(0), "zero address");

        PT = _pt;
        maturity = PTExpiry(PT).expiry();
        baseDiscountPerYear = _baseDiscountPerYear;
    }

    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        uint256 timeLeft = (maturity > block.timestamp) ? maturity - block.timestamp : 0;
        uint256 discount = getDiscount(timeLeft);

        require(discount <= ONE, "discount overflow");

        return (0, int256(ONE - discount), 0, 0, 0);
    }

    function decimals() external pure returns (uint8) {
        return 18;
    }

    function getDiscount(uint256 timeLeft) public view returns (uint256) {
        return (timeLeft * baseDiscountPerYear) / SECONDS_PER_YEAR;
    }
}

interface PTExpiry {
    function expiry() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IPChainlinkOracleEssential {
    function decimals() external view returns (uint8);

    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}

{
  "remappings": [
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    "node_modules/@layerzerolabs/oapp-evm/:@openzeppelin/=node_modules/@openzeppelin/",
    "node_modules/@layerzerolabs/oft-evm/:@openzeppelin/=node_modules/@openzeppelin/",
    "node_modules/@layerzerolabs/:@openzeppelin/=node_modules/@openzeppelin-v5/",
    "@axelar-network/=node_modules/@axelar-network/",
    "@chainlink/=node_modules/@chainlink/",
    "@openzeppelin/contracts/=node_modules/@openzeppelin/contracts/",
    "@openzeppelin/contracts-upgradeable/=node_modules/@openzeppelin/contracts-upgradeable/",
    "@openzeppelin-v5/contracts/=node_modules/@openzeppelin-v5/contracts/",
    "@openzeppelin-v5/contracts-upgradeable/=node_modules/@openzeppelin-v5/contracts-upgradeable/",
    "@prb/test/=node_modules/@prb/test/",
    "forge-std/=node_modules/forge-std/",
    "@eth-optimism/=node_modules/@eth-optimism/",
    "@layerzerolabs/=node_modules/@layerzerolabs/",
    "ds-test/=lib/surl/lib/forge-std/lib/ds-test/src/",
    "@pendle/core-v2/=lib/pendle-core-v2/",
    "pendle-sy/=lib/pendle-sy/contracts/",
    "hardhat-deploy/=node_modules/hardhat-deploy/",
    "solidity-bytes-utils/=node_modules/solidity-bytes-utils/",
    "solidity-stringutils/=lib/surl/lib/solidity-stringutils/src/",
    "surl/=lib/surl/src/",
    "pendle-core-v2/=lib/pendle-core-v2/contracts/",
    "pendle-core-v3/=lib/pendle-core-v3/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": true,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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