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

contract PendleSparkLinearDiscountOracle {
    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);
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_pt","type":"address"},{"internalType":"uint256","name":"_baseDiscountPerYear","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"PT","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseDiscountPerYear","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"timeLeft","type":"uint256"}],"name":"getDiscount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maturity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000004d4062bad41e03b1cdee4c06263f96eb8183234100000000000000000000000000000000000000000000000002c68af0bb140000

-----Decoded View---------------
Arg [0] : _pt (address): 0x4D4062bAD41E03b1cdee4C06263F96EB81832341
Arg [1] : _baseDiscountPerYear (uint256): 200000000000000000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000004d4062bad41e03b1cdee4c06263f96eb81832341
Arg [1] : 00000000000000000000000000000000000000000000000002c68af0bb140000