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// SPDX-License-Identifier: ISC
pragma solidity ^0.8.20;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ========================== FxsDualOracle ===========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

// ====================================================================

import { Timelock2Step } from "frax-std/access-control/v1/Timelock2Step.sol";
import { ITimelock2Step } from "frax-std/access-control/v1/interfaces/ITimelock2Step.sol";
import { ChainlinkOracleWithMaxDelay, ConstructorParams as ChainlinkOracleWithMaxDelayParams } from "../abstracts/ChainlinkOracleWithMaxDelay.sol";
import { DualOracleBase, ConstructorParams as DualOracleBaseParams } from "../DualOracleBase.sol";
import { FraxSwapTwapOracle, ConstructorParams as FraxSwapOracleParams } from "../abstracts/FraxSwapTwapPriceOracle.sol";
import "interfaces/IDualOracle.sol";

struct ConstructorParams {
    address fraxswapPair;
    uint32 twapDuration;
    address fxsErc20;
    address fxsRedstoneFeed;
    uint256 maximumOracleDelay;
    address timelockAddress;
}

/// @title FrxEthDualOracle
contract FxsDualOracle is DualOracleBase, Timelock2Step, FraxSwapTwapOracle, ChainlinkOracleWithMaxDelay {
    address public immutable FXS_ERC20;

    constructor(
        ConstructorParams memory _params
    )
        DualOracleBase(
            DualOracleBaseParams({
                baseToken0: address(840),
                baseToken0Decimals: 18,
                quoteToken0: _params.fxsErc20,
                quoteToken0Decimals: 18,
                baseToken1: address(840),
                baseToken1Decimals: 18,
                quoteToken1: _params.fxsErc20,
                quoteToken1Decimals: 18
            })
        )
        Timelock2Step()
        ChainlinkOracleWithMaxDelay(
            ChainlinkOracleWithMaxDelayParams({
                chainlinkFeedAddress: _params.fxsRedstoneFeed,
                maximumOracleDelay: _params.maximumOracleDelay
            })
        )
        FraxSwapTwapOracle(
            FraxSwapOracleParams({
                fraxswapPair: _params.fraxswapPair,
                toQuote: _params.fxsErc20,
                twapDuration: _params.twapDuration
            })
        )
    {
        _setTimelock({ _newTimelock: _params.timelockAddress });
        _registerInterface({ interfaceId: type(IDualOracle).interfaceId });
        _registerInterface({ interfaceId: type(ITimelock2Step).interfaceId });

        FXS_ERC20 = _params.fxsErc20;
    }

    // ====================================================================
    // View Helpers
    // ====================================================================

    function name() external pure returns (string memory) {
        return "FXS RedStone Dual Oracle + TWAP";
    }

    // ====================================================================
    // Configuration Setters
    // ====================================================================

    /// @notice The ```setMaximumOracleDelay``` function set the max oracle delay for the Fxs/USD Redstone oracle
    /// @dev Requires msg.sender to be the timelock address
    /// @param _newMaxOracleDelay The new max oracle delay
    function setMaximumOracleDelay(uint256 _newMaxOracleDelay) external override {
        _requireTimelock();
        _setMaximumOracleDelay({ _newMaxOracleDelay: _newMaxOracleDelay });
    }

    /// @notice The ```setTwapDurationFraxSwap``` function set the twap duration for the FraxSwap Twap Oracle
    /// @dev Requiores msg.sender to be the timelock address
    /// @param _newTwapDuration The new twap duration
    function setTwapDurationFraxSwap(uint32 _newTwapDuration) external override {
        _requireTimelock();
        _setTwapDurationFraxSwap({ _newTwapDuration: _newTwapDuration });
    }

    // ====================================================================
    // Price Functions
    // ====================================================================

    /// @notice The ```getFxsPerUsdRedStone``` function returns the amount of fxs per 1 USD
    /// @return _isBadData Whether the data returned from the oracle is stale
    /// @return _fxsPerUsd The amount of fxs per unit of USD
    function getFxsPerUsdRedStone() public view returns (bool _isBadData, uint256 _fxsPerUsd) {
        (bool isBadData, , uint256 usdPerFxs) = _getChainlinkPrice();
        _isBadData = isBadData;
        _fxsPerUsd = (CHAINLINK_FEED_PRECISION * ORACLE_PRECISION) / usdPerFxs;
    }

    /// @notice The ```getPricesNormalized``` function returns the normalized prices in human readable form
    /// @return _isBadDataNormal If the Redstone oracle is stale
    /// @return _priceLowNormal The normalized low price
    /// @return _priceHighNormal The normalized high price
    function getPricesNormalized()
        external
        view
        returns (bool _isBadDataNormal, uint256 _priceLowNormal, uint256 _priceHighNormal)
    {
        (bool _isBadData, uint256 _priceLow, uint256 _priceHigh) = _getPrices();
        _isBadDataNormal = _isBadData;

        _priceLowNormal = NORMALIZATION_0 > 0
            ? _priceLow * 10 ** uint256(NORMALIZATION_0)
            : _priceLow / 10 ** (uint256(-NORMALIZATION_0));

        _priceHighNormal = NORMALIZATION_1 > 0
            ? _priceHigh * 10 ** uint256(NORMALIZATION_1)
            : _priceHigh / 10 ** (uint256(-NORMALIZATION_1));
    }

    function _getPrices() internal view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh) {
        (bool isBadData, uint256 _fxsPerUsdRedStone) = getFxsPerUsdRedStone();

        uint256 _fraxPerFxsTwap = _getTwapFraxSwapPair();
        uint256 _fxsPerFraxTwap = (ORACLE_PRECISION ** 2) / _fraxPerFxsTwap;

        _isBadData = isBadData;
        _priceLow = _fxsPerFraxTwap < _fxsPerUsdRedStone ? _fxsPerFraxTwap : _fxsPerUsdRedStone;
        _priceHigh = _fxsPerUsdRedStone > _fxsPerFraxTwap ? _fxsPerUsdRedStone : _fxsPerFraxTwap;
    }

    /// @notice The ```getPrices``` function is intended to return two prices from different oracles
    /// @return _isBadData is true when data is stale or otherwise bad
    /// @return _priceLow is the lower of the two prices
    /// @return _priceHigh is the higher of the two prices
    function getPrices() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh) {
        return _getPrices();
    }
}

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

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ========================== Timelock2Step ===========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

// Primary Author
// Drake Evans: https://github.com/DrakeEvans

// Reviewers
// Dennis: https://github.com/denett

// ====================================================================

/// @title Timelock2Step
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @dev Inspired by the OpenZeppelin's Ownable2Step contract
/// @notice  An abstract contract which contains 2-step transfer and renounce logic for a timelock address
abstract contract Timelock2Step {
    /// @notice The pending timelock address
    address public pendingTimelockAddress;

    /// @notice The current timelock address
    address public timelockAddress;

    constructor() {
        timelockAddress = msg.sender;
    }

    /// @notice Emitted when timelock is transferred
    error OnlyTimelock();

    /// @notice Emitted when pending timelock is transferred
    error OnlyPendingTimelock();

    /// @notice The ```TimelockTransferStarted``` event is emitted when the timelock transfer is initiated
    /// @param previousTimelock The address of the previous timelock
    /// @param newTimelock The address of the new timelock
    event TimelockTransferStarted(address indexed previousTimelock, address indexed newTimelock);

    /// @notice The ```TimelockTransferred``` event is emitted when the timelock transfer is completed
    /// @param previousTimelock The address of the previous timelock
    /// @param newTimelock The address of the new timelock
    event TimelockTransferred(address indexed previousTimelock, address indexed newTimelock);

    /// @notice The ```_isSenderTimelock``` function checks if msg.sender is current timelock address
    /// @return Whether or not msg.sender is current timelock address
    function _isSenderTimelock() internal view returns (bool) {
        return msg.sender == timelockAddress;
    }

    /// @notice The ```_requireTimelock``` function reverts if msg.sender is not current timelock address
    function _requireTimelock() internal view {
        if (msg.sender != timelockAddress) revert OnlyTimelock();
    }

    /// @notice The ```_isSenderPendingTimelock``` function checks if msg.sender is pending timelock address
    /// @return Whether or not msg.sender is pending timelock address
    function _isSenderPendingTimelock() internal view returns (bool) {
        return msg.sender == pendingTimelockAddress;
    }

    /// @notice The ```_requirePendingTimelock``` function reverts if msg.sender is not pending timelock address
    function _requirePendingTimelock() internal view {
        if (msg.sender != pendingTimelockAddress) revert OnlyPendingTimelock();
    }

    /// @notice The ```_transferTimelock``` function initiates the timelock transfer
    /// @dev This function is to be implemented by a public function
    /// @param _newTimelock The address of the nominated (pending) timelock
    function _transferTimelock(address _newTimelock) internal {
        pendingTimelockAddress = _newTimelock;
        emit TimelockTransferStarted(timelockAddress, _newTimelock);
    }

    /// @notice The ```_acceptTransferTimelock``` function completes the timelock transfer
    /// @dev This function is to be implemented by a public function
    function _acceptTransferTimelock() internal {
        pendingTimelockAddress = address(0);
        _setTimelock(msg.sender);
    }

    /// @notice The ```_setTimelock``` function sets the timelock address
    /// @dev This function is to be implemented by a public function
    /// @param _newTimelock The address of the new timelock
    function _setTimelock(address _newTimelock) internal {
        emit TimelockTransferred(timelockAddress, _newTimelock);
        timelockAddress = _newTimelock;
    }

    /// @notice The ```transferTimelock``` function initiates the timelock transfer
    /// @dev Must be called by the current timelock
    /// @param _newTimelock The address of the nominated (pending) timelock
    function transferTimelock(address _newTimelock) external virtual {
        _requireTimelock();
        _transferTimelock(_newTimelock);
    }

    /// @notice The ```acceptTransferTimelock``` function completes the timelock transfer
    /// @dev Must be called by the pending timelock
    function acceptTransferTimelock() external virtual {
        _requirePendingTimelock();
        _acceptTransferTimelock();
    }

    /// @notice The ```renounceTimelock``` function renounces the timelock after setting pending timelock to current timelock
    /// @dev Pending timelock must be set to current timelock before renouncing, creating a 2-step renounce process
    function renounceTimelock() external virtual {
        _requireTimelock();
        _requirePendingTimelock();
        _transferTimelock(address(0));
        _setTimelock(address(0));
    }
}

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

interface ITimelock2Step {
    event TimelockTransferStarted(address indexed previousTimelock, address indexed newTimelock);
    event TimelockTransferred(address indexed previousTimelock, address indexed newTimelock);

    function acceptTransferTimelock() external;

    function pendingTimelockAddress() external view returns (address);

    function renounceTimelock() external;

    function timelockAddress() external view returns (address);

    function transferTimelock(address _newTimelock) external;
}

// SPDX-License-Identifier: ISC
pragma solidity ^0.8.20;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// =================== ChainlinkOracleWithMaxDelay ====================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

// Author
// Drake Evans: https://github.com/DrakeEvans

// Reviewers
// Dennis: https://github.com/denett

// ====================================================================

import { AggregatorV3Interface } from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import { ERC165Storage } from "src/contracts/utils/ERC165Storage.sol";
import { IChainlinkOracleWithMaxDelay } from "interfaces/oracles/abstracts/IChainlinkOracleWithMaxDelay.sol";

struct ConstructorParams {
    address chainlinkFeedAddress;
    uint256 maximumOracleDelay;
}

/// @title ChainlinkOracleWithMaxDelay
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice  An abstract oracle for getting prices from Chainlink
abstract contract ChainlinkOracleWithMaxDelay is ERC165Storage, IChainlinkOracleWithMaxDelay {
    /// @notice Chainlink aggregator
    address public immutable CHAINLINK_FEED_ADDRESS;

    /// @notice Decimals of ETH/USD chainlink feed
    uint8 public immutable CHAINLINK_FEED_DECIMALS;

    /// @notice Precision of ETH/USD chainlink feed
    uint256 public immutable CHAINLINK_FEED_PRECISION;

    /// @notice Maximum delay of Chainlink data, after which it is considered stale
    uint256 public maximumOracleDelay;

    constructor(ConstructorParams memory _params) {
        _registerInterface({ interfaceId: type(IChainlinkOracleWithMaxDelay).interfaceId });

        CHAINLINK_FEED_ADDRESS = _params.chainlinkFeedAddress;
        CHAINLINK_FEED_DECIMALS = AggregatorV3Interface(CHAINLINK_FEED_ADDRESS).decimals();
        CHAINLINK_FEED_PRECISION = 10 ** uint256(CHAINLINK_FEED_DECIMALS);
        maximumOracleDelay = _params.maximumOracleDelay;
    }

    /// @notice The ```SetMaximumOracleDelay``` event is emitted when the max oracle delay is set
    /// @param oldMaxOracleDelay The old max oracle delay
    /// @param newMaxOracleDelay The new max oracle delay
    event SetMaximumOracleDelay(uint256 oldMaxOracleDelay, uint256 newMaxOracleDelay);

    /// @notice The ```_setMaximumOracleDelay``` function sets the max oracle delay to determine if Chainlink data is stale
    /// @param _newMaxOracleDelay The new max oracle delay
    function _setMaximumOracleDelay(uint256 _newMaxOracleDelay) internal {
        emit SetMaximumOracleDelay({ oldMaxOracleDelay: maximumOracleDelay, newMaxOracleDelay: _newMaxOracleDelay });
        maximumOracleDelay = _newMaxOracleDelay;
    }

    function setMaximumOracleDelay(uint256 _newMaxOracleDelay) external virtual;

    function _getChainlinkPrice() internal view returns (bool _isBadData, uint256 _updatedAt, uint256 _price) {
        (, int256 _answer, , uint256 _chainlinkUpdatedAt, ) = AggregatorV3Interface(CHAINLINK_FEED_ADDRESS)
            .latestRoundData();

        // If data is stale or negative, set bad data to true and return
        _isBadData = _answer <= 0 || ((block.timestamp - _chainlinkUpdatedAt) > maximumOracleDelay);
        _updatedAt = _chainlinkUpdatedAt;
        _price = uint256(_answer);
    }

    /// @notice The ```getChainlinkPrice``` function returns the chainlink price and the timestamp of the last update
    /// @dev Uses the same prevision as the chainlink feed, virtual so it can be overridden
    /// @return _isBadData True if the data is stale or negative
    /// @return _updatedAt The timestamp of the last update
    /// @return _price The price
    function getChainlinkPrice() external view virtual returns (bool _isBadData, uint256 _updatedAt, uint256 _price) {
        return _getChainlinkPrice();
    }
}

// SPDX-License-Identifier: ISC
pragma solidity ^0.8.20;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ========================== DualOracleBase ==========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

// Author
// Drake Evans: https://github.com/DrakeEvans

// ====================================================================

import "interfaces/IDualOracle.sol";

struct ConstructorParams {
    address baseToken0;
    uint8 baseToken0Decimals;
    address quoteToken0;
    uint8 quoteToken0Decimals;
    address baseToken1;
    uint8 baseToken1Decimals;
    address quoteToken1;
    uint8 quoteToken1Decimals;
}

/// @title DualOracleBase
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice  Base Contract for Frax Dual Oracles
abstract contract DualOracleBase is IDualOracle {
    /// @notice The precision of the oracle
    uint256 public constant ORACLE_PRECISION = 1e18;

    /// @notice The first quote token
    address public immutable QUOTE_TOKEN_0;

    /// @notice The first quote token decimals
    uint256 public immutable QUOTE_TOKEN_0_DECIMALS;

    /// @notice The second quote token
    address public immutable QUOTE_TOKEN_1;

    /// @notice The second quote token decimals
    uint256 public immutable QUOTE_TOKEN_1_DECIMALS;

    /// @notice The first base token
    address public immutable BASE_TOKEN_0;

    /// @notice The first base token decimals
    uint256 public immutable BASE_TOKEN_0_DECIMALS;

    /// @notice The second base token
    address public immutable BASE_TOKEN_1;

    /// @notice The second base token decimals
    uint256 public immutable BASE_TOKEN_1_DECIMALS;

    /// @notice The first normalization factor which accounts for different decimals across ERC20s
    /// @dev Normalization = quoteTokenDecimals - baseTokenDecimals
    int256 public immutable NORMALIZATION_0;

    /// @notice The second normalization factor which accounts for different decimals across ERC20s
    /// @dev Normalization = quoteTokenDecimals - baseTokenDecimals
    int256 public immutable NORMALIZATION_1;

    constructor(ConstructorParams memory _params) {
        QUOTE_TOKEN_0 = _params.quoteToken0;
        QUOTE_TOKEN_0_DECIMALS = _params.quoteToken0Decimals;
        QUOTE_TOKEN_1 = _params.quoteToken1;
        QUOTE_TOKEN_1_DECIMALS = _params.quoteToken1Decimals;
        BASE_TOKEN_0 = _params.baseToken0;
        BASE_TOKEN_0_DECIMALS = _params.baseToken0Decimals;
        BASE_TOKEN_1 = _params.baseToken1;
        BASE_TOKEN_1_DECIMALS = _params.baseToken1Decimals;
        NORMALIZATION_0 = int256(QUOTE_TOKEN_0_DECIMALS) - int256(BASE_TOKEN_0_DECIMALS);
        NORMALIZATION_1 = int256(QUOTE_TOKEN_1_DECIMALS) - int256(BASE_TOKEN_1_DECIMALS);
    }

    // ====================================================================
    // View Helpers
    // ====================================================================

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

// SPDX-License-Identifier: ISC
pragma solidity ^0.8.20;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ======================= FraxswapTwapOracle =========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

// ====================================================================

import { ERC165Storage } from "src/contracts/utils/ERC165Storage.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { IFraxswapPair } from "dev-fraxswap/src/contracts/core/interfaces/IFraxswapPair.sol";
import { UQ112x112 } from "src/contracts/utils/UQ112x112.sol";

struct ConstructorParams {
    address fraxswapPair;
    address toQuote;
    uint32 twapDuration;
}

/// @title FraxSwapTwapOracle
/// @notice Will fetch the twap price of the quote asset denominated in the base token
/// @notice Only intended to work for pairs in which both of the assets have 18 decimals
abstract contract FraxSwapTwapOracle is ERC165Storage {
    /// @notice Fraxswap Pair to source twap
    IFraxswapPair public immutable FRAXSWAP_PAIR;

    /// @notice The token in the fraxswap pair which the price of the base token is denominated in
    address public FRAXSWAP_BASE_TOKEN;

    /// @notice The token in the fraxswap pair which we would like the twap of
    address public FRAXSWAP_QUOTE_TOKEN;

    /// @notice The duration of the time wieghted moving average is
    uint32 public twapDuration;

    /// @notice flow control to perform the operation on token0|token1 accounting
    bool isToken0;

    using UQ112x112 for uint224;

    constructor(ConstructorParams memory _params) {
        // Fraxswap Oracle Config
        FRAXSWAP_PAIR = IFraxswapPair(_params.fraxswapPair);
        twapDuration = _params.twapDuration;
        address token0 = FRAXSWAP_PAIR.token0();
        address token1 = FRAXSWAP_PAIR.token1();

        if (token0 == _params.toQuote) {
            isToken0 = true;
            FRAXSWAP_QUOTE_TOKEN = _params.toQuote;
            FRAXSWAP_BASE_TOKEN = token1;
        } else if (token1 == _params.toQuote) {
            // isToken0 initalizes to false
            FRAXSWAP_QUOTE_TOKEN = _params.toQuote;
            FRAXSWAP_BASE_TOKEN = token0;
        } else {
            revert TokenNotInPair();
        }

        // Sanity check tokens
        if (FRAXSWAP_PAIR.getTWAPHistoryLength() < 5) revert PairNotOldEnough();
        if (IERC20Metadata(token0).decimals() != 18) revert WrongDecimals();
        if (IERC20Metadata(token1).decimals() != 18) revert WrongDecimals();
    }

    // ====================================================================
    // Post Construction Setters
    // ====================================================================

    function setTwapDurationFraxSwap(uint32 _newTwapDuration) external virtual;

    /// @notice The ```_setTwapDurationFraxSwap``` function is called to modify the twap duration post deployment
    /// @dev Contains no access control
    /// @param _newTwapDuration The new twap duration to set
    function _setTwapDurationFraxSwap(uint32 _newTwapDuration) internal {
        emit NewTwapDurationSet(twapDuration, _newTwapDuration);
        twapDuration = _newTwapDuration;
    }

    // ====================================================================
    // Twap Pricinge Function
    // ====================================================================

    /// @notice The ```_getTwapFraxSwapPair``` function is called to get the twap of the fraxswap pair
    /// @return _basePerQuote returns the amount of base token per quote token
    function _getTwapFraxSwapPair() public view virtual returns (uint256 _basePerQuote) {
        uint256 len = FRAXSWAP_PAIR.getTWAPHistoryLength();
        IFraxswapPair.TWAPObservation memory obsCurrent = FRAXSWAP_PAIR.TWAPObservationHistory(len - 1);

        // Update last observation up to the current block
        if (obsCurrent.timestamp < block.timestamp) {
            // Update the reserves
            (uint112 _reserve0, uint112 _reserve1, ) = FRAXSWAP_PAIR.getReserves();
            uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
            // Get the latest observed prices
            unchecked {
                uint32 timeElapsed = blockTimestamp - uint32(obsCurrent.timestamp);
                obsCurrent.price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
                obsCurrent.price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
                obsCurrent.timestamp = blockTimestamp;
            }
        }

        IFraxswapPair.TWAPObservation memory obsLast;

        uint256 j;
        // Cannot be > 1 obs per second and > 1 block per second
        for (uint256 i = twapDuration / 40; i < twapDuration; i += twapDuration / 20) {
            obsLast = FRAXSWAP_PAIR.TWAPObservationHistory(len - (1 + i));
            unchecked {
                if ((obsCurrent.timestamp - obsLast.timestamp) < twapDuration) {
                    j = i;
                } else {
                    break;
                }
            }
        }
        for (j; j < len; j++) {
            obsLast = FRAXSWAP_PAIR.TWAPObservationHistory(len - (1 + j));
            unchecked {
                if ((obsCurrent.timestamp - obsLast.timestamp) > twapDuration) break;
            }
        }
        if (isToken0) {
            uint256 encoded;
            unchecked {
                encoded =
                    (obsCurrent.price0CumulativeLast - obsLast.price0CumulativeLast) /
                    uint32(obsCurrent.timestamp - obsLast.timestamp);
            }
            _basePerQuote = decode112with18(encoded);
        } else {
            uint256 encoded;
            unchecked {
                encoded =
                    (obsCurrent.price1CumulativeLast - obsLast.price1CumulativeLast) /
                    uint32(obsCurrent.timestamp - obsLast.timestamp);
            }
            _basePerQuote = decode112with18(encoded);
        }
    }

    // ====================================================================
    // Math Utilities
    // ====================================================================

    // Inspired by https://gist.github.com/alexroan/629172728f82cb5c88554896163b35a0#file-uniswapanchoredview-sol-L24
    // decode a uq112x112 into a uint with 18 decimals of precision
    function decode112with18(uint256 valToDecode) internal pure returns (uint256) {
        // we only have 256 - 224 = 32 bits to spare, so scaling up by ~60 bits is dangerous
        // instead, get close to:
        //  (x * 1e18) >> 112
        // without risk of overflowing, e.g.:
        //  (x) / 2 ** (112 - lg(1e18))
        return valToDecode / 5_192_296_858_534_827;
    }

    event NewTwapDurationSet(uint32 oldDuration, uint32 newDuration);

    error TokenNotInPair();
    error WrongDecimals();
    error PairNotOldEnough();
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.20;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IDualOracle is IERC165 {
    function ORACLE_PRECISION() external view returns (uint256);

    function BASE_TOKEN_0() external view returns (address);

    function BASE_TOKEN_0_DECIMALS() external view returns (uint256);

    function BASE_TOKEN_1() external view returns (address);

    function BASE_TOKEN_1_DECIMALS() external view returns (uint256);

    function decimals() external view returns (uint8);

    function getPricesNormalized() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh);

    function getPrices() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh);

    function name() external view returns (string memory);

    function NORMALIZATION_0() external view returns (int256);

    function NORMALIZATION_1() external view returns (int256);

    function QUOTE_TOKEN_0() external view returns (address);

    function QUOTE_TOKEN_0_DECIMALS() external view returns (uint256);

    function QUOTE_TOKEN_1() external view returns (address);

    function QUOTE_TOKEN_1_DECIMALS() external view returns (uint256);
}

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

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

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

  function version() external view returns (uint256);

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165Storage.sol)
pragma solidity ^0.8.0;

import { ERC165 } from "@openzeppelin/contracts/utils/introspection/ERC165.sol";

/**
 * @dev Storage based implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165Storage is ERC165 {
    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return super.supportsInterface(interfaceId) || _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.20;

import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IChainlinkOracleWithMaxDelay is IERC165 {
    event SetMaximumOracleDelay(address oracle, uint256 oldMaxOracleDelay, uint256 newMaxOracleDelay);

    function CHAINLINK_FEED_ADDRESS() external view returns (address);

    function CHAINLINK_FEED_DECIMALS() external view returns (uint8);

    function CHAINLINK_FEED_PRECISION() external view returns (uint256);

    function getChainlinkPrice() external view returns (bool _isBadData, uint256 _updatedAt, uint256 _usdPerEth);

    function maximumOracleDelay() external view returns (uint256);

    function setMaximumOracleDelay(uint256 _newMaxOracleDelay) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.0;

import { IUniswapV2Pair } from "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";

/// @dev Fraxswap LP Pair Interface
interface IFraxswapPair is IUniswapV2Pair {
    // TWAMM
    struct TWAPObservation {
        uint256 timestamp;
        uint256 price0CumulativeLast;
        uint256 price1CumulativeLast;
    }

    function TWAPObservationHistory(uint256 index) external view returns (TWAPObservation memory);

    event LongTermSwap0To1(address indexed addr, uint256 orderId, uint256 amount0In, uint256 numberOfTimeIntervals);
    event LongTermSwap1To0(address indexed addr, uint256 orderId, uint256 amount1In, uint256 numberOfTimeIntervals);
    event CancelLongTermOrder(
        address indexed addr,
        uint256 orderId,
        address sellToken,
        uint256 unsoldAmount,
        address buyToken,
        uint256 purchasedAmount
    );
    event WithdrawProceedsFromLongTermOrder(
        address indexed addr,
        uint256 orderId,
        address indexed proceedToken,
        uint256 proceeds,
        bool orderExpired
    );

    function fee() external view returns (uint256);

    function longTermSwapFrom0To1(uint256 amount0In, uint256 numberOfTimeIntervals) external returns (uint256 orderId);
    function longTermSwapFrom1To0(uint256 amount1In, uint256 numberOfTimeIntervals) external returns (uint256 orderId);
    function cancelLongTermSwap(uint256 orderId) external;
    function withdrawProceedsFromLongTermSwap(
        uint256 orderId
    ) external returns (bool is_expired, address rewardTkn, uint256 totalReward);
    function executeVirtualOrders(uint256 blockTimestamp) external;

    function getAmountOut(uint256 amountIn, address tokenIn) external view returns (uint256);
    function getAmountIn(uint256 amountOut, address tokenOut) external view returns (uint256);

    function orderTimeInterval() external returns (uint256);
    function getTWAPHistoryLength() external view returns (uint256);
    function getTwammReserves()
        external
        view
        returns (
            uint112 _reserve0,
            uint112 _reserve1,
            uint32 _blockTimestampLast,
            uint112 _twammReserve0,
            uint112 _twammReserve1,
            uint256 _fee
        );
    function getReserveAfterTwamm(
        uint256 blockTimestamp
    )
        external
        view
        returns (
            uint112 _reserve0,
            uint112 _reserve1,
            uint256 lastVirtualOrderTimestamp,
            uint112 _twammReserve0,
            uint112 _twammReserve1
        );
    function getNextOrderID() external view returns (uint256);
    function getOrderIDsForUser(address user) external view returns (uint256[] memory);
    function getOrderIDsForUserLength(address user) external view returns (uint256);
    function twammUpToDate() external view returns (bool);
    function getTwammState()
        external
        view
        returns (
            uint256 token0Rate,
            uint256 token1Rate,
            uint256 lastVirtualOrderTimestamp,
            uint256 orderTimeInterval_rtn,
            uint256 rewardFactorPool0,
            uint256 rewardFactorPool1
        );
    function getTwammSalesRateEnding(
        uint256 _blockTimestamp
    ) external view returns (uint256 orderPool0SalesRateEnding, uint256 orderPool1SalesRateEnding);
    function getTwammRewardFactor(
        uint256 _blockTimestamp
    ) external view returns (uint256 rewardFactorPool0AtTimestamp, uint256 rewardFactorPool1AtTimestamp);
    function getTwammOrder(
        uint256 orderId
    )
        external
        view
        returns (
            uint256 id,
            uint256 creationTimestamp,
            uint256 expirationTimestamp,
            uint256 saleRate,
            address owner,
            address sellTokenAddr,
            address buyTokenAddr
        );
    function getTwammOrderProceedsView(
        uint256 orderId,
        uint256 blockTimestamp
    ) external view returns (bool orderExpired, uint256 totalReward);
    function getTwammOrderProceeds(uint256 orderId) external returns (bool orderExpired, uint256 totalReward);

    function togglePauseNewSwaps() external;
}

// SPDX-License-Identifier: ISC
pragma solidity >=0.8.0;
// File contracts/Fraxswap/core/libraries/UQ112x112.sol

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2 ** 112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

{
  "remappings": [
    "ds-test/=node_modules/ds-test/src/",
    "forge-std/=node_modules/forge-std/src/",
    "frax-std/=node_modules/frax-standard-solidity/src/",
    "script/=src/script/",
    "src/=src/",
    "test/=src/test/",
    "interfaces/=src/contracts/interfaces/",
    "arbitrum/=node_modules/@arbitrum/",
    "rlp/=node_modules/solidity-rlp/contracts/",
    "@solmate/=node_modules/@rari-capital/solmate/src/",
    "@arbitrum/=node_modules/@arbitrum/",
    "@chainlink/=node_modules/@chainlink/",
    "@mean-finance/=node_modules/@mean-finance/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@rari-capital/=node_modules/@rari-capital/",
    "@uniswap/=node_modules/@uniswap/",
    "dev-fraxswap/=node_modules/dev-fraxswap/",
    "frax-standard-solidity/=node_modules/frax-standard-solidity/",
    "prb-math/=node_modules/prb-math/",
    "solidity-bytes-utils/=node_modules/solidity-bytes-utils/",
    "solidity-rlp/=node_modules/solidity-rlp/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000b4da8da10fff1f6127ab71395053aa1d499b503f0000000000000000000000000000000000000000000000000000000000000f3c000000000000000000000000fc00000000000000000000000000000000000002000000000000000000000000bf228a9131ab3bb8ca8c7a4ad574932253d99cd10000000000000000000000000000000000000000000000000000000000000f3c000000000000000000000000c16068d1ca7e24e20e56bb70af4d00d92aa4f0b2

-----Decoded View---------------
Arg [0] : _params (tuple): 
     Arg [1] : fraxswapPair (address): 0xb4dA8dA10ffF1F6127ab71395053Aa1d499b503F
     Arg [2] : twapDuration (uint32): 3900
     Arg [3] : fxsErc20 (address): 0xFc00000000000000000000000000000000000002
     Arg [4] : fxsRedstoneFeed (address): 0xbf228a9131AB3BB8ca8C7a4Ad574932253D99Cd1
     Arg [5] : maximumOracleDelay (uint256): 3900
     Arg [6] : timelockAddress (address): 0xc16068d1ca7E24E20e56bB70af4D00D92AA4f0b2


-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000b4da8da10fff1f6127ab71395053aa1d499b503f
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000f3c
Arg [2] : 000000000000000000000000fc00000000000000000000000000000000000002
Arg [3] : 000000000000000000000000bf228a9131ab3bb8ca8c7a4ad574932253d99cd1
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000f3c
Arg [5] : 000000000000000000000000c16068d1ca7e24e20e56bb70af4d00d92aa4f0b2