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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "src/interfaces/IChainlinkFeed.sol";

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

/// @title FeedSwitch for Pendle PT tokens
/// @notice A contract to switch between feeds after a timelock period
/// @dev The switch can only be initiated by the guardian and will be effective after the timelock period has passed, can only be done before maturity.
/// If the switch is initiated but not yet effective, it can be cancelled by the guardian without timelock period.
/// The feed will default to the afterMaturityFeed if the maturity has passed.
/// The guardian can initiate the switch again to the previous feed multiple times.
contract FeedSwitch {
    error NotGuardian();
    error FeedDecimalsMismatch();
    error MaturityInPast();
    error MaturityPassed();

    address public immutable guardian;
    IChainlinkFeed public immutable initialFeed;
    IChainlinkFeed public immutable beforeMaturityFeed;
    IChainlinkFeed public immutable afterMaturityFeed;
    uint256 public immutable maturity;
    uint256 public immutable timelockPeriod;

    IChainlinkFeed public feed;
    IChainlinkFeed public previousFeed;

    uint256 public switchCompletedAt;

    event FeedSwitchInitiated(address indexed newFeed);

    constructor(
        address _feed,
        address _beforeMaturityFeed,
        address _afterMaturityFeed,
        uint256 _timelockPeriod,
        address _pendlePT,
        address _guardian
    ) {
        feed = IChainlinkFeed(_feed);
        initialFeed = IChainlinkFeed(_feed);
        beforeMaturityFeed = IChainlinkFeed(_beforeMaturityFeed);
        afterMaturityFeed = IChainlinkFeed(_afterMaturityFeed);
        if (
            beforeMaturityFeed.decimals() != 18 ||
            afterMaturityFeed.decimals() != 18 ||
            feed.decimals() != 18
        ) revert FeedDecimalsMismatch();

        timelockPeriod = _timelockPeriod;
        maturity = IPendlePT(_pendlePT).expiry();
        if (maturity <= block.timestamp) revert MaturityInPast();

        guardian = _guardian;
    }

    /// @notice Initiate the feed switch, entering the timelock period
    /// @dev Can only be called by the guardian and can be done before maturity, after that, the feed will return afterMaturityFeed data
    function initiateFeedSwitch() external {
        if (msg.sender != guardian) revert NotGuardian();
        if (block.timestamp >= maturity) revert MaturityPassed();

        if (switchCompletedAt < block.timestamp) {
            switchCompletedAt = block.timestamp + timelockPeriod;
        } else switchCompletedAt = 0;

        if (address(feed) == address(initialFeed)) {
            feed = beforeMaturityFeed;
            previousFeed = initialFeed;
        } else {
            feed = initialFeed;
            previousFeed = beforeMaturityFeed;
        }

        emit FeedSwitchInitiated(address(feed));
    }

    /// @notice Get the current feed data
    /// @return roundId The round ID
    /// @return price The price of the asset
    /// @return startedAt The timestamp of the start of the round
    /// @return updatedAt The timestamp of the last update
    /// @return answeredInRound The round ID in which the price was answered
    function latestRoundData()
        public
        view
        returns (
            uint80 roundId,
            int256 price,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        )
    {
        if (block.timestamp >= maturity) {
            return afterMaturityFeed.latestRoundData();
        } else if (block.timestamp >= switchCompletedAt) {
            return feed.latestRoundData();
        } else {
            return previousFeed.latestRoundData();
        }
    }

    /// @notice Get the latest price of the asset
    /// @return price The price of the asset
    function latestAnswer() external view returns (int256) {
        (, int256 latestPrice, , , ) = latestRoundData();
        return latestPrice;
    }

    /// @notice Get the number of decimals of the feed
    /// @return decimals The number of decimals
    function decimals() external pure returns (uint8) {
        return 18;
    }

    /// @notice Check if the feed switch is queued
    /// @dev If not queued, will return false and 0 as time left
    /// @return isQueued Whether the feed switch is queued
    /// @return timeLeft The time left for the switch to be effective
    function isFeedSwitchQueued() external view returns (bool, uint256) {
        bool isQueued = switchCompletedAt > 0 &&
            block.timestamp < switchCompletedAt;
        if (!isQueued) return (false, 0);
        else return (isQueued, switchCompletedAt - block.timestamp);
    }
}

pragma solidity ^0.8.13;

interface IChainlinkFeed {
    function aggregator() external view returns (address aggregator);

    function decimals() external view returns (uint8 decimals);

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

    function latestAnswer() external view returns (int256 price);

    function description() external view returns (string memory description);
}

interface IChainlinkBasePriceFeed is IChainlinkFeed {
    function assetToUsd() external view returns (IChainlinkFeed);

    function assetToUsdFallback() external view returns (IChainlinkFeed);

    function assetToUsdHeartbeat() external view returns (uint256 heartbeat);
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solmate/=lib/solmate/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_feed","type":"address"},{"internalType":"address","name":"_beforeMaturityFeed","type":"address"},{"internalType":"address","name":"_afterMaturityFeed","type":"address"},{"internalType":"uint256","name":"_timelockPeriod","type":"uint256"},{"internalType":"address","name":"_pendlePT","type":"address"},{"internalType":"address","name":"_guardian","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"FeedDecimalsMismatch","type":"error"},{"inputs":[],"name":"MaturityInPast","type":"error"},{"inputs":[],"name":"MaturityPassed","type":"error"},{"inputs":[],"name":"NotGuardian","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newFeed","type":"address"}],"name":"FeedSwitchInitiated","type":"event"},{"inputs":[],"name":"afterMaturityFeed","outputs":[{"internalType":"contract IChainlinkFeed","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"beforeMaturityFeed","outputs":[{"internalType":"contract IChainlinkFeed","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"feed","outputs":[{"internalType":"contract IChainlinkFeed","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"guardian","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"initialFeed","outputs":[{"internalType":"contract IChainlinkFeed","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"initiateFeedSwitch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isFeedSwitchQueued","outputs":[{"internalType":"bool","name":"","type":"bool"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"price","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"},{"inputs":[],"name":"previousFeed","outputs":[{"internalType":"contract IChainlinkFeed","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"switchCompletedAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"timelockPeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000005cb542eb054f81b8fa1760c077f44aa80271c75d0000000000000000000000006277cb27232f35c75d3d908b26f3670e7d167400000000000000000000000000b3c1d801a02d88adc96a294123c2daa382345058000000000000000000000000000000000000000000000000000000000000fd20000000000000000000000000e00bd3df25fb187d6abbb620b3dfd19839947b81000000000000000000000000e3ed95e130ad9e15643f5a5f232a3dae980784cd

-----Decoded View---------------
Arg [0] : _feed (address): 0x5CB542EB054f81b8Fa1760c077f44AA80271c75D
Arg [1] : _beforeMaturityFeed (address): 0x6277cB27232F35C75D3d908b26F3670e7d167400
Arg [2] : _afterMaturityFeed (address): 0xB3C1D801A02d88adC96A294123c2Daa382345058
Arg [3] : _timelockPeriod (uint256): 64800
Arg [4] : _pendlePT (address): 0xE00bd3Df25fb187d6ABBB620b3dfd19839947b81
Arg [5] : _guardian (address): 0xE3eD95e130ad9E15643f5A5f232a3daE980784cd

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000005cb542eb054f81b8fa1760c077f44aa80271c75d
Arg [1] : 0000000000000000000000006277cb27232f35c75d3d908b26f3670e7d167400
Arg [2] : 000000000000000000000000b3c1d801a02d88adc96a294123c2daa382345058
Arg [3] : 000000000000000000000000000000000000000000000000000000000000fd20
Arg [4] : 000000000000000000000000e00bd3df25fb187d6abbb620b3dfd19839947b81
Arg [5] : 000000000000000000000000e3ed95e130ad9e15643f5a5f232a3dae980784cd