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// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.21;

import { ERC4626 } from "@solmate/mixins/ERC4626.sol";
import { SafeTransferLib } from "@solmate/utils/SafeTransferLib.sol";
import { ERC20 } from "@solmate/tokens/ERC20.sol";
import { Math } from "src/utils/Math.sol";
import { Owned } from "@solmate/auth/Owned.sol";
import { AutomationCompatibleInterface } from "@chainlink/contracts/src/v0.8/interfaces/AutomationCompatibleInterface.sol";
import { IRegistrar } from "src/interfaces/external/Chainlink/IRegistrar.sol";
import { IRegistry } from "src/interfaces/external/Chainlink/IRegistry.sol";
import { IChainlinkAggregator } from "src/interfaces/external/IChainlinkAggregator.sol";

contract ERC4626SharePriceOracle is AutomationCompatibleInterface {
    using Math for uint256;
    using SafeTransferLib for ERC20;

    // ========================================= STRUCTS =========================================

    struct Observation {
        uint64 timestamp;
        uint192 cumulative;
    }

    /**
     * @notice Use a struct for constructor args so we do not encounter stack too deep errors.
     */
    struct ConstructorArgs {
        ERC4626 _target;
        uint64 _heartbeat;
        uint64 _deviationTrigger;
        uint64 _gracePeriod;
        uint16 _observationsToUse;
        address _automationRegistry;
        address _automationRegistrar;
        address _automationAdmin;
        address _link;
        uint216 _startingAnswer;
        uint256 _allowedAnswerChangeLower;
        uint256 _allowedAnswerChangeUpper;
        address _sequencerUptimeFeed;
        uint64 _sequencerGracePeriod;
    }

    // ========================================= CONSTANTS =========================================
    /**
     * @notice Gas Limit to use for Upkeep created in `initialize`.
     * @dev Should be fairly constant between networks, but 50_000 is a safe limit in
     *      most situations.
     */
    uint32 public constant UPKEEP_GAS_LIMIT = 50_000;

    /**
     * @notice Decimals used to scale share price for internal calculations.
     */
    uint8 public constant decimals = 18;

    // ========================================= GLOBAL STATE =========================================
    /**
     * @notice The latest stored onchain answer.
     */
    uint216 public answer;

    /**
     * @notice Stores the index of observations with the pending Observation.
     */
    uint16 public currentIndex;

    /**
     * @notice The length of the observations array.
     * @dev `observations` will never change its length once set in the constructor.
     *      By saving this value here, we can take advantage of variable packing to make reads cheaper.
     * @dev This is not immutable to make it easier in the future to create oracles that can expand their observations.
     */
    uint16 public observationsLength;

    /**
     * @notice Triggered when answer provided by Chainlink Automation is extreme.
     * @dev true: No further upkeeps are allowed, `getLatest` and `getLatestAnswer` will return true error bools.
     *      false: Continue as normal.
     */
    bool public killSwitch;

    /**
     * @notice Stores the observations this contract uses to derive a
     *         time weighted average answer.
     */
    Observation[] public observations;

    /**
     * @notice The Automation V2 Forwarder address for this contract.
     */
    address public automationForwarder;

    /**
     * @notice keccak256 hash of the parameters used to create this upkeep.
     * @dev Only set if `initialize` leads to a pending upkeep.
     */
    bytes32 public pendingUpkeepParamHash;

    //============================== ERRORS ===============================

    error ERC4626SharePriceOracle__OnlyCallableByAutomationForwarder();
    error ERC4626SharePriceOracle__StalePerformData();
    error ERC4626SharePriceOracle__CumulativeTooLarge();
    error ERC4626SharePriceOracle__NoUpkeepConditionMet();
    error ERC4626SharePriceOracle__SharePriceTooLarge();
    error ERC4626SharePriceOracle__FuturePerformData();
    error ERC4626SharePriceOracle__ContractKillSwitch();
    error ERC4626SharePriceOracle__AlreadyInitialized();
    error ERC4626SharePriceOracle__ParamHashDiffers();
    error ERC4626SharePriceOracle__NoPendingUpkeepToHandle();

    //============================== EVENTS ===============================

    /**
     * @notice Emitted when performUpkeep is ran.
     * @param timeUpdated the time the answer was updated on chain
     * @param timeAnswerCalculated the time the answer was calculated in checkUpkeep
     * @param latestAnswer the new answer
     * @param timeWeightedAverageAnswer the new time weighted average answer
     * @param isNotSafeToUse bool
     *                       if true: `timeWeightedAverageAnswer` is illogical, use `latestAnswer`
     *                       if false: use `timeWeightedAverageAnswer`
     */
    event OracleUpdated(
        uint256 timeUpdated,
        uint256 timeAnswerCalculated,
        uint256 latestAnswer,
        uint256 timeWeightedAverageAnswer,
        bool isNotSafeToUse
    );

    /**
     * @notice Emitted when the oracles kill switch is activated.
     * @dev If this happens, then the proposed performData lead to extremely volatile share price,
     *      so we need to investigate why that happened, mitigate it, then launch a new share price oracle.
     */
    event KillSwitchActivated(uint256 reportedAnswer, uint256 minAnswer, uint256 maxAnswer);

    /**
     * @notice Emitted when the upkeep is registered.
     */
    event UpkeepRegistered(uint256 upkeepId, address forwarder);

    /**
     * @notice Emitted when a upkeep registration is left pending.
     */
    event UpkeepPending(bytes32 upkeepParamHash);

    //============================== IMMUTABLES ===============================

    /**
     * @notice Determines the minimum time for each observation, and is used to determine if an
     *         answer is stale.
     */
    uint64 public immutable heartbeat;

    /**
     * @notice Used to enforce that the summation of each observations delay used in
     *         a time weighed average calculation is less than the gracePeriod.
     * @dev Example: Using a 3 day TWAA with 1 hour grace period.
     *      When calculating the TWAA, the total time delta for completed observations must be greater than 3 days but less than
     *      3 days + 1hr. So one observation could be delayed 1 hr, or two observations could be
     *      delayed 30 min each.
     */
    uint64 public immutable gracePeriod;

    /**
     * @notice Number between 0 -> 10_000 that determines how far off the last saved answer
     *         can deviate from the current answer.
     * @dev This value should be reflective of the vaults expected maximum percent share
     *      price change during a heartbeat duration.
     * @dev
     *    -1_000 == 10%
     *    -100 == 1%
     *    -10 == 0.1%
     *    -1 == 0.01% or 1 bps
     */
    uint64 public immutable deviationTrigger;

    /**
     * @notice One share of target vault.
     */
    uint256 public immutable ONE_SHARE;

    /**
     * @notice The admin address for the Automation Upkeep.
     */
    address public immutable automationAdmin;

    /**
     * @notice Chainlink's Automation Registry contract address.
     * @notice For mainnet use 0x6593c7De001fC8542bB1703532EE1E5aA0D458fD.
     */
    address public immutable automationRegistry;

    /**
     * @notice Chainlink's Automation Registrar contract address.
     * @notice For mainnet use 0x6B0B234fB2f380309D47A7E9391E29E9a179395a.
     */
    address public immutable automationRegistrar;

    /**
     * @notice Link Token.
     * @notice For mainnet use 0x514910771AF9Ca656af840dff83E8264EcF986CA.
     */
    ERC20 public immutable link;

    /**
     * @notice ERC4626 target vault this contract is an oracle for.
     */
    ERC4626 public immutable target;

    /**
     * @notice Target vault decimals.
     */
    uint8 public immutable targetDecimals;

    /**
     * @notice Multiplier with 4 decimals that determines the acceptable lower band
     *         for a performUpkeep answer.
     */
    uint256 public immutable allowedAnswerChangeLower;

    /**
     * @notice Multiplier with 4 decimals that determines the acceptable upper band
     *         for a performUpkeep answer.
     */
    uint256 public immutable allowedAnswerChangeUpper;

    /**
     * @notice Address for the networks sequencer uptime feed.
     * @dev For oracles that do not rely on a sequencer being up, use address(0).
     */
    IChainlinkAggregator internal immutable sequencerUptimeFeed;

    /**
     * @notice The grace period to enforce after a sequencer comes back online.
     * @dev Calls to `getLatest` and `getLatestAnswer` will return a true for
     *      `isNotSafeToUse` if the sequencer is down, or if the time since the
     *      sequencer went back online is less than `sequencerGracePeriod`.
     */
    uint64 public immutable sequencerGracePeriod;

    /**
     * @notice TWAA Minimum Duration = `_observationsToUse` * `_heartbeat`.
     * @notice TWAA Maximum Duration = `_observationsToUse` * `_heartbeat` + `gracePeriod` + `_heartbeat`.
     * @notice TWAA calculations will use the current pending observation, and then `_observationsToUse` observations.
     */
    constructor(ConstructorArgs memory args) {
        target = args._target;
        targetDecimals = target.decimals();
        ONE_SHARE = 10 ** targetDecimals;
        heartbeat = args._heartbeat;
        deviationTrigger = args._deviationTrigger;
        gracePeriod = args._gracePeriod;
        // Add 1 to observations to use.
        args._observationsToUse = args._observationsToUse + 1;
        observationsLength = args._observationsToUse;

        // Grow Observations array to required length, and fill it with observations that use 1 for timestamp and cumulative.
        // That way the initial upkeeps won't need to change state from 0 which is more expensive.
        for (uint256 i; i < args._observationsToUse; ++i)
            observations.push(Observation({ timestamp: 1, cumulative: 1 }));

        // Set to args._startingAnswer so slot is dirty for first upkeep, and does not trigger kill switch.
        answer = args._startingAnswer;

        if (args._allowedAnswerChangeLower > 1e4) revert("Illogical Lower");
        allowedAnswerChangeLower = args._allowedAnswerChangeLower;
        if (args._allowedAnswerChangeUpper < 1e4) revert("Illogical Upper");
        allowedAnswerChangeUpper = args._allowedAnswerChangeUpper;

        automationRegistry = args._automationRegistry;
        automationRegistrar = args._automationRegistrar;
        automationAdmin = args._automationAdmin;
        link = ERC20(args._link);
        sequencerUptimeFeed = IChainlinkAggregator(args._sequencerUptimeFeed);
        sequencerGracePeriod = args._sequencerGracePeriod;
    }

    //============================== INITIALIZATION ===============================

    /**
     * @notice Should be called after contract creation.
     * @dev Creates a Chainlink Automation Upkeep, and set the `automationForwarder` address.
     */
    function initialize(uint96 initialUpkeepFunds) external {
        // This function is only callable once.
        if (automationForwarder != address(0) || pendingUpkeepParamHash != bytes32(0))
            revert ERC4626SharePriceOracle__AlreadyInitialized();

        link.safeTransferFrom(msg.sender, address(this), initialUpkeepFunds);

        // Create the upkeep.
        IRegistrar registrar = IRegistrar(automationRegistrar);
        IRegistry registry = IRegistry(automationRegistry);
        IRegistrar.RegistrationParams memory params = IRegistrar.RegistrationParams({
            name: string.concat(target.name(), " Share Price Oracle"),
            encryptedEmail: hex"",
            upkeepContract: address(this),
            gasLimit: UPKEEP_GAS_LIMIT,
            adminAddress: automationAdmin,
            triggerType: 0,
            checkData: hex"",
            triggerConfig: hex"",
            offchainConfig: hex"",
            amount: initialUpkeepFunds
        });

        link.safeApprove(automationRegistrar, initialUpkeepFunds);
        uint256 upkeepID = registrar.registerUpkeep(params);
        if (upkeepID > 0) {
            // Upkeep was successfully registered.
            address forwarder = registry.getForwarder(upkeepID);
            automationForwarder = forwarder;
            emit UpkeepRegistered(upkeepID, forwarder);
        } else {
            // Upkeep is pending.
            bytes32 paramHash = keccak256(
                abi.encode(
                    params.upkeepContract,
                    params.gasLimit,
                    params.adminAddress,
                    params.triggerType,
                    params.checkData,
                    params.offchainConfig
                )
            );
            pendingUpkeepParamHash = paramHash;
            emit UpkeepPending(paramHash);
        }
    }

    /**
     * @notice Finish setting forwarder address if `initialize` did not get an auto-approved upkeep.
     */
    function handlePendingUpkeep(uint256 _upkeepId) external {
        if (pendingUpkeepParamHash == bytes32(0) || automationForwarder != address(0))
            revert ERC4626SharePriceOracle__NoPendingUpkeepToHandle();

        IRegistry registry = IRegistry(automationRegistry);

        IRegistry.UpkeepInfo memory upkeepInfo = registry.getUpkeep(_upkeepId);
        // Build the param hash using upkeepInfo.
        // The upkeep id has 16 bytes of entropy, that need to be shifted out(16*8=128).
        // Then take the resulting number and only take the last byte of it to get the trigger type.
        uint8 triggerType = uint8(_upkeepId >> 128);
        bytes32 proposedParamHash = keccak256(
            abi.encode(
                upkeepInfo.target,
                upkeepInfo.executeGas,
                upkeepInfo.admin,
                triggerType,
                upkeepInfo.checkData,
                upkeepInfo.offchainConfig
            )
        );
        if (pendingUpkeepParamHash != proposedParamHash) revert ERC4626SharePriceOracle__ParamHashDiffers();

        // Hashes match, so finish initialization.
        address forwarder = registry.getForwarder(_upkeepId);
        automationForwarder = forwarder;
        emit UpkeepRegistered(_upkeepId, forwarder);
    }

    //============================== CHAINLINK AUTOMATION ===============================

    /**
     * @notice Leverages Automation V2 secure offchain computation to run expensive share price calculations offchain,
     *         then inject them onchain using `performUpkeep`.
     */
    function checkUpkeep(bytes calldata) external view returns (bool upkeepNeeded, bytes memory performData) {
        // Get target share price.
        uint216 sharePrice = _getTargetSharePrice();
        // Read state from one slot.
        uint256 _answer = answer;
        uint16 _currentIndex = currentIndex;
        uint16 _observationsLength = observationsLength;
        bool _killSwitch = killSwitch;

        if (!_killSwitch) {
            // See if we need to update because answer is stale or outside deviation.
            // Time since answer was last updated.
            uint256 timeDeltaCurrentAnswer = block.timestamp - observations[_currentIndex].timestamp;
            uint256 timeDeltaSincePreviousObservation = block.timestamp -
                observations[_getPreviousIndex(_currentIndex, _observationsLength)].timestamp;
            uint64 _heartbeat = heartbeat;

            if (
                timeDeltaCurrentAnswer >= _heartbeat ||
                timeDeltaSincePreviousObservation >= _heartbeat ||
                sharePrice > _answer.mulDivDown(1e4 + deviationTrigger, 1e4) ||
                sharePrice < _answer.mulDivDown(1e4 - deviationTrigger, 1e4)
            ) {
                // We need to update answer.
                upkeepNeeded = true;
                performData = abi.encode(sharePrice, uint64(block.timestamp));
            }
        } // else no upkeep is needed
    }

    /**
     * @notice Save answer on chain, and update observations if needed.
     */
    function performUpkeep(bytes calldata performData) external {
        if (msg.sender != automationForwarder) revert ERC4626SharePriceOracle__OnlyCallableByAutomationForwarder();
        (uint216 sharePrice, uint64 currentTime) = abi.decode(performData, (uint216, uint64));

        // Verify atleast one of the upkeep conditions was met.
        bool upkeepConditionMet;

        // Read state from one slot.
        uint256 _answer = answer;
        uint16 _currentIndex = currentIndex;
        uint16 _observationsLength = observationsLength;
        bool _killSwitch = killSwitch;

        if (_killSwitch) revert ERC4626SharePriceOracle__ContractKillSwitch();

        // See if kill switch should be activated based on change between answers.
        if (_checkIfKillSwitchShouldBeTriggered(sharePrice, _answer)) return;

        // See if we are upkeeping because of deviation.
        if (
            sharePrice > uint256(_answer).mulDivDown(1e4 + deviationTrigger, 1e4) ||
            sharePrice < uint256(_answer).mulDivDown(1e4 - deviationTrigger, 1e4)
        ) upkeepConditionMet = true;

        // Update answer.
        answer = sharePrice;

        // Update current observation.
        Observation storage currentObservation = observations[_currentIndex];
        // Make sure time is larger than previous time.
        if (currentTime <= currentObservation.timestamp) revert ERC4626SharePriceOracle__StalePerformData();

        // Make sure time is not in the future.
        if (currentTime > block.timestamp) revert ERC4626SharePriceOracle__FuturePerformData();

        // See if we are updating because of staleness.
        uint256 timeDelta = currentTime - currentObservation.timestamp;
        if (timeDelta >= heartbeat) upkeepConditionMet = true;

        // Use the old answer to calculate cumulative.
        uint256 currentCumulative = currentObservation.cumulative + (_answer * timeDelta);
        if (currentCumulative > type(uint192).max) revert ERC4626SharePriceOracle__CumulativeTooLarge();
        currentObservation.cumulative = uint192(currentCumulative);
        currentObservation.timestamp = currentTime;

        uint256 timeDeltaSincePreviousObservation = currentTime -
            observations[_getPreviousIndex(_currentIndex, _observationsLength)].timestamp;
        // See if we need to advance to the next cumulative.
        if (timeDeltaSincePreviousObservation >= heartbeat) {
            uint16 nextIndex = _getNextIndex(_currentIndex, _observationsLength);
            currentIndex = nextIndex;
            // Update memory variable for event.
            _currentIndex = nextIndex;
            // Update newest cumulative.
            Observation storage newObservation = observations[nextIndex];
            newObservation.cumulative = uint192(currentCumulative);
            newObservation.timestamp = currentTime;
            upkeepConditionMet = true;
        }

        if (!upkeepConditionMet) revert ERC4626SharePriceOracle__NoUpkeepConditionMet();

        (uint256 timeWeightedAverageAnswer, bool isNotSafeToUse) = _getTimeWeightedAverageAnswer(
            sharePrice,
            _currentIndex,
            _observationsLength
        );

        // See if kill switch should be activated based on change between proposed answer and time weighted average answer.
        if (!isNotSafeToUse && _checkIfKillSwitchShouldBeTriggered(sharePrice, timeWeightedAverageAnswer)) return;
        emit OracleUpdated(block.timestamp, currentTime, sharePrice, timeWeightedAverageAnswer, isNotSafeToUse);
    }

    //============================== ORACLE VIEW FUNCTIONS ===============================

    /**
     * @notice Get the latest answer, time weighted average answer, and bool indicating whether they can be safely used.
     */
    function getLatest() external view returns (uint256 ans, uint256 timeWeightedAverageAnswer, bool notSafeToUse) {
        // Read state from one slot.
        ans = answer;
        uint16 _currentIndex = currentIndex;
        uint16 _observationsLength = observationsLength;
        bool _killSwitch = killSwitch;

        if (_killSwitch) return (0, 0, true);
        if (_checkSequencer()) return (0, 0, true);

        // Check if answer is stale, if so set notSafeToUse to true, and return.
        uint256 timeDeltaSinceLastUpdated = block.timestamp - observations[currentIndex].timestamp;
        // Note add in the grace period here, because it can take time for the upkeep TX to go through.
        if (timeDeltaSinceLastUpdated > (heartbeat + gracePeriod)) return (0, 0, true);

        (timeWeightedAverageAnswer, notSafeToUse) = _getTimeWeightedAverageAnswer(
            ans,
            _currentIndex,
            _observationsLength
        );
        if (notSafeToUse) return (0, 0, true);
    }

    /**
     * @notice Get the latest answer, and bool indicating whether answer is safe to use or not.
     */
    function getLatestAnswer() external view returns (uint256, bool) {
        uint256 _answer = answer;
        bool _killSwitch = killSwitch;

        if (_killSwitch) return (0, true);
        if (_checkSequencer()) return (0, true);

        // Check if answer is stale, if so set notSafeToUse to true, and return.
        uint256 timeDeltaSinceLastUpdated = block.timestamp - observations[currentIndex].timestamp;
        // Note add in the grace period here, because it can take time for the upkeep TX to go through.
        if (timeDeltaSinceLastUpdated > (heartbeat + gracePeriod)) return (0, true);

        return (_answer, false);
    }

    //============================== INTERNAL HELPER FUNCTIONS ===============================

    /**
     * @notice Get the next index of observations array.
     */
    function _getNextIndex(uint16 _currentIndex, uint16 _length) internal pure returns (uint16 nextIndex) {
        nextIndex = (_currentIndex == _length - 1) ? 0 : _currentIndex + 1;
    }

    /**
     * @notice Get the previous index of observations array.
     */
    function _getPreviousIndex(uint16 _currentIndex, uint16 _length) internal pure returns (uint16 previousIndex) {
        previousIndex = (_currentIndex == 0) ? _length - 1 : _currentIndex - 1;
    }

    /**
     * @notice Use observations to get the time weighted average answer.
     */
    function _getTimeWeightedAverageAnswer(
        uint256 _answer,
        uint16 _currentIndex,
        uint16 _observationsLength
    ) internal view returns (uint256 timeWeightedAverageAnswer, bool notSafeToUse) {
        // Read observations from storage.
        Observation memory mostRecentlyCompletedObservation = observations[
            _getPreviousIndex(_currentIndex, _observationsLength)
        ];
        Observation memory oldestObservation = observations[_getNextIndex(_currentIndex, _observationsLength)];

        // Data is not set.
        if (oldestObservation.timestamp == 1) return (0, true);

        // Make sure that the old observations we are using are not too stale.
        uint256 timeDelta = mostRecentlyCompletedObservation.timestamp - oldestObservation.timestamp;
        /// @dev use _length - 2 because
        /// remove 1 because observations array stores the current pending observation.
        /// remove 1 because we are really interested in the time between observations.
        uint256 minDuration = heartbeat * (_observationsLength - 2);
        uint256 maxDuration = minDuration + gracePeriod;
        // Data is too new
        if (timeDelta < minDuration) return (0, true);
        // Data is too old
        if (timeDelta > maxDuration) return (0, true);

        Observation memory latestObservation = observations[_currentIndex];
        uint192 latestCumulative = latestObservation.cumulative +
            uint192((_answer * (block.timestamp - latestObservation.timestamp)));

        timeWeightedAverageAnswer =
            (latestCumulative - oldestObservation.cumulative) /
            (block.timestamp - oldestObservation.timestamp);
    }

    /**
     * @notice Get the target ERC4626's share price using totalAssets, and totalSupply.
     */
    function _getTargetSharePrice() internal view returns (uint216 sharePrice) {
        uint256 totalShares = target.totalSupply();
        // Get total Assets but scale it up to decimals decimals of precision.
        uint256 totalAssets = target.totalAssets().changeDecimals(targetDecimals, decimals);

        if (totalShares == 0) return 0;

        uint256 _sharePrice = ONE_SHARE.mulDivDown(totalAssets, totalShares);

        if (_sharePrice > type(uint216).max) revert ERC4626SharePriceOracle__SharePriceTooLarge();
        sharePrice = uint216(_sharePrice);
    }

    /**
     * @notice Activate the kill switch if `proposedAnswer` is extreme when compared to `answerToCompareAgainst`
     * @return bool indicating whether calling function should immediately exit or not.
     */
    function _checkIfKillSwitchShouldBeTriggered(
        uint256 proposedAnswer,
        uint256 answerToCompareAgainst
    ) internal returns (bool) {
        if (
            proposedAnswer < answerToCompareAgainst.mulDivDown(allowedAnswerChangeLower, 1e4) ||
            proposedAnswer > answerToCompareAgainst.mulDivDown(allowedAnswerChangeUpper, 1e4)
        ) {
            killSwitch = true;
            emit KillSwitchActivated(
                proposedAnswer,
                answerToCompareAgainst.mulDivDown(allowedAnswerChangeLower, 1e4),
                answerToCompareAgainst.mulDivDown(allowedAnswerChangeUpper, 1e4)
            );
            return true;
        }
        return false;
    }

    /**
     * @notice Checks if the sequencer is down, or if the grace period is not met.
     * @return bool indicating if the sequencer has a problem
     */
    function _checkSequencer() internal view returns (bool) {
        if (address(sequencerUptimeFeed) != address(0)) {
            (, int256 sequencerAnswer, uint256 startedAt, , ) = sequencerUptimeFeed.latestRoundData();

            // This check should make TXs from L1 to L2 revert if someone tried interacting with the cellar while the sequencer is down.
            // Answer == 0: Sequencer is up
            // Answer == 1: Sequencer is down
            if (sequencerAnswer == 1) {
                return true;
            }

            // Make sure the grace period has passed after the
            // sequencer is back up.
            uint256 timeSinceUp = block.timestamp - startedAt;
            if (timeSinceUp <= sequencerGracePeriod) {
                return true;
            }
        }

        // If we made it this far, the sequencer is fine, and or it is not set.
        return false;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";
import {SafeTransferLib} from "../utils/SafeTransferLib.sol";
import {FixedPointMathLib} from "../utils/FixedPointMathLib.sol";

/// @notice Minimal ERC4626 tokenized Vault implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/mixins/ERC4626.sol)
abstract contract ERC4626 is ERC20 {
    using SafeTransferLib for ERC20;
    using FixedPointMathLib for uint256;

    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Deposit(address indexed caller, address indexed owner, uint256 assets, uint256 shares);

    event Withdraw(
        address indexed caller,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /*//////////////////////////////////////////////////////////////
                               IMMUTABLES
    //////////////////////////////////////////////////////////////*/

    ERC20 public immutable asset;

    constructor(
        ERC20 _asset,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol, _asset.decimals()) {
        asset = _asset;
    }

    /*//////////////////////////////////////////////////////////////
                        DEPOSIT/WITHDRAWAL LOGIC
    //////////////////////////////////////////////////////////////*/

    function deposit(uint256 assets, address receiver) public virtual returns (uint256 shares) {
        // Check for rounding error since we round down in previewDeposit.
        require((shares = previewDeposit(assets)) != 0, "ZERO_SHARES");

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assets);

        _mint(receiver, shares);

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

        afterDeposit(assets, shares);
    }

    function mint(uint256 shares, address receiver) public virtual returns (uint256 assets) {
        assets = previewMint(shares); // No need to check for rounding error, previewMint rounds up.

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assets);

        _mint(receiver, shares);

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

        afterDeposit(assets, shares);
    }

    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) public virtual returns (uint256 shares) {
        shares = previewWithdraw(assets); // No need to check for rounding error, previewWithdraw rounds up.

        if (msg.sender != owner) {
            uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals.

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

        beforeWithdraw(assets, shares);

        _burn(owner, shares);

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

        asset.safeTransfer(receiver, assets);
    }

    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) public virtual returns (uint256 assets) {
        if (msg.sender != owner) {
            uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals.

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

        // Check for rounding error since we round down in previewRedeem.
        require((assets = previewRedeem(shares)) != 0, "ZERO_ASSETS");

        beforeWithdraw(assets, shares);

        _burn(owner, shares);

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

        asset.safeTransfer(receiver, assets);
    }

    /*//////////////////////////////////////////////////////////////
                            ACCOUNTING LOGIC
    //////////////////////////////////////////////////////////////*/

    function totalAssets() public view virtual returns (uint256);

    function convertToShares(uint256 assets) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? assets : assets.mulDivDown(supply, totalAssets());
    }

    function convertToAssets(uint256 shares) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? shares : shares.mulDivDown(totalAssets(), supply);
    }

    function previewDeposit(uint256 assets) public view virtual returns (uint256) {
        return convertToShares(assets);
    }

    function previewMint(uint256 shares) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? shares : shares.mulDivUp(totalAssets(), supply);
    }

    function previewWithdraw(uint256 assets) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? assets : assets.mulDivUp(supply, totalAssets());
    }

    function previewRedeem(uint256 shares) public view virtual returns (uint256) {
        return convertToAssets(shares);
    }

    /*//////////////////////////////////////////////////////////////
                     DEPOSIT/WITHDRAWAL LIMIT LOGIC
    //////////////////////////////////////////////////////////////*/

    function maxDeposit(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    function maxMint(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    function maxWithdraw(address owner) public view virtual returns (uint256) {
        return convertToAssets(balanceOf[owner]);
    }

    function maxRedeem(address owner) public view virtual returns (uint256) {
        return balanceOf[owner];
    }

    /*//////////////////////////////////////////////////////////////
                          INTERNAL HOOKS LOGIC
    //////////////////////////////////////////////////////////////*/

    function beforeWithdraw(uint256 assets, uint256 shares) internal virtual {}

    function afterDeposit(uint256 assets, uint256 shares) internal virtual {}
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

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

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

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

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

        return true;
    }

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

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

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

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

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

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.21;

library Math {
    /**
     * @notice Substract with a floor of 0 for the result.
     */
    function subMinZero(uint256 x, uint256 y) internal pure returns (uint256) {
        return x > y ? x - y : 0;
    }

    /**
     * @notice Used to change the decimals of precision used for an amount.
     */
    function changeDecimals(uint256 amount, uint8 fromDecimals, uint8 toDecimals) internal pure returns (uint256) {
        if (fromDecimals == toDecimals) {
            return amount;
        } else if (fromDecimals < toDecimals) {
            return amount * 10 ** (toDecimals - fromDecimals);
        } else {
            return amount / 10 ** (fromDecimals - toDecimals);
        }
    }

    // ===================================== OPENZEPPELIN'S MATH =====================================

    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    // ================================= SOLMATE's FIXEDPOINTMATHLIB =================================

    uint256 public constant WAD = 1e18; // The scalar of ETH and most ERC20s.

    function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down.
    }

    function mulDivDown(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 z) {
        assembly {
            // Store x * y in z for now.
            z := mul(x, y)

            // Equivalent to require(denominator != 0 && (x == 0 || (x * y) / x == y))
            if iszero(and(iszero(iszero(denominator)), or(iszero(x), eq(div(z, x), y)))) {
                revert(0, 0)
            }

            // Divide z by the denominator.
            z := div(z, denominator)
        }
    }

    function mulDivUp(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 z) {
        assembly {
            // Store x * y in z for now.
            z := mul(x, y)

            // Equivalent to require(denominator != 0 && (x == 0 || (x * y) / x == y))
            if iszero(and(iszero(iszero(denominator)), or(iszero(x), eq(div(z, x), y)))) {
                revert(0, 0)
            }

            // First, divide z - 1 by the denominator and add 1.
            // We allow z - 1 to underflow if z is 0, because we multiply the
            // end result by 0 if z is zero, ensuring we return 0 if z is zero.
            z := mul(iszero(iszero(z)), add(div(sub(z, 1), denominator), 1))
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Simple single owner authorization mixin.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Owned.sol)
abstract contract Owned {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

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

    /*//////////////////////////////////////////////////////////////
                            OWNERSHIP STORAGE
    //////////////////////////////////////////////////////////////*/

    address public owner;

    modifier onlyOwner() virtual {
        require(msg.sender == owner, "UNAUTHORIZED");

        _;
    }

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(address _owner) {
        owner = _owner;

        emit OwnershipTransferred(address(0), _owner);
    }

    /*//////////////////////////////////////////////////////////////
                             OWNERSHIP LOGIC
    //////////////////////////////////////////////////////////////*/

    function transferOwnership(address newOwner) public virtual onlyOwner {
        owner = newOwner;

        emit OwnershipTransferred(msg.sender, newOwner);
    }
}

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

interface AutomationCompatibleInterface {
  /**
   * @notice method that is simulated by the keepers to see if any work actually
   * needs to be performed. This method does does not actually need to be
   * executable, and since it is only ever simulated it can consume lots of gas.
   * @dev To ensure that it is never called, you may want to add the
   * cannotExecute modifier from KeeperBase to your implementation of this
   * method.
   * @param checkData specified in the upkeep registration so it is always the
   * same for a registered upkeep. This can easily be broken down into specific
   * arguments using `abi.decode`, so multiple upkeeps can be registered on the
   * same contract and easily differentiated by the contract.
   * @return upkeepNeeded boolean to indicate whether the keeper should call
   * performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if
   * upkeep is needed. If you would like to encode data to decode later, try
   * `abi.encode`.
   */
  function checkUpkeep(bytes calldata checkData) external returns (bool upkeepNeeded, bytes memory performData);

  /**
   * @notice method that is actually executed by the keepers, via the registry.
   * The data returned by the checkUpkeep simulation will be passed into
   * this method to actually be executed.
   * @dev The input to this method should not be trusted, and the caller of the
   * method should not even be restricted to any single registry. Anyone should
   * be able call it, and the input should be validated, there is no guarantee
   * that the data passed in is the performData returned from checkUpkeep. This
   * could happen due to malicious keepers, racing keepers, or simply a state
   * change while the performUpkeep transaction is waiting for confirmation.
   * Always validate the data passed in.
   * @param performData is the data which was passed back from the checkData
   * simulation. If it is encoded, it can easily be decoded into other types by
   * calling `abi.decode`. This data should not be trusted, and should be
   * validated against the contract's current state.
   */
  function performUpkeep(bytes calldata performData) external;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.21;

interface IRegistrar {
    struct RegistrationParams {
        string name;
        bytes encryptedEmail;
        address upkeepContract;
        uint32 gasLimit;
        address adminAddress;
        uint8 triggerType;
        bytes checkData;
        bytes triggerConfig;
        bytes offchainConfig;
        uint96 amount;
    }

    enum AutoApproveType {
        DISABLED,
        ENABLED_SENDER_ALLOWLIST,
        ENABLED_ALL
    }

    function registerUpkeep(RegistrationParams calldata requestParams) external returns (uint256 id);

    function setTriggerConfig(
        uint8 triggerType,
        AutoApproveType autoApproveType,
        uint32 autoApproveMaxAllowed
    ) external;

    function owner() external view returns (address);

    function approve(
        string memory name,
        address upkeepContract,
        uint32 gasLimit,
        address adminAddress,
        uint8 triggerType,
        bytes calldata checkData,
        bytes memory triggerConfig,
        bytes calldata offchainConfig,
        bytes32 hash
    ) external;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.21;

interface IRegistry {
    struct UpkeepInfo {
        address target;
        uint32 executeGas;
        bytes checkData;
        uint96 balance;
        address admin;
        uint64 maxValidBlocknumber;
        uint32 lastPerformBlockNumber;
        uint96 amountSpent;
        bool paused;
        bytes offchainConfig;
    }

    function getForwarder(uint256 upkeepID) external view returns (address forwarder);

    function getUpkeep(uint256 id) external view returns (UpkeepInfo memory upkeepInfo);
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.21;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV2V3Interface.sol";

interface IChainlinkAggregator is AggregatorV2V3Interface {
    function maxAnswer() external view returns (int192);

    function minAnswer() external view returns (int192);

    function aggregator() external view returns (address);
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Arithmetic library with operations for fixed-point numbers.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol)
/// @author Inspired by USM (https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol)
library FixedPointMathLib {
    /*//////////////////////////////////////////////////////////////
                    SIMPLIFIED FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    uint256 internal constant MAX_UINT256 = 2**256 - 1;

    uint256 internal constant WAD = 1e18; // The scalar of ETH and most ERC20s.

    function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down.
    }

    function mulWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, y, WAD); // Equivalent to (x * y) / WAD rounded up.
    }

    function divWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, WAD, y); // Equivalent to (x * WAD) / y rounded down.
    }

    function divWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, WAD, y); // Equivalent to (x * WAD) / y rounded up.
    }

    /*//////////////////////////////////////////////////////////////
                    LOW LEVEL FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function mulDivDown(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // Divide x * y by the denominator.
            z := div(mul(x, y), denominator)
        }
    }

    function mulDivUp(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // If x * y modulo the denominator is strictly greater than 0,
            // 1 is added to round up the division of x * y by the denominator.
            z := add(gt(mod(mul(x, y), denominator), 0), div(mul(x, y), denominator))
        }
    }

    function rpow(
        uint256 x,
        uint256 n,
        uint256 scalar
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            switch x
            case 0 {
                switch n
                case 0 {
                    // 0 ** 0 = 1
                    z := scalar
                }
                default {
                    // 0 ** n = 0
                    z := 0
                }
            }
            default {
                switch mod(n, 2)
                case 0 {
                    // If n is even, store scalar in z for now.
                    z := scalar
                }
                default {
                    // If n is odd, store x in z for now.
                    z := x
                }

                // Shifting right by 1 is like dividing by 2.
                let half := shr(1, scalar)

                for {
                    // Shift n right by 1 before looping to halve it.
                    n := shr(1, n)
                } n {
                    // Shift n right by 1 each iteration to halve it.
                    n := shr(1, n)
                } {
                    // Revert immediately if x ** 2 would overflow.
                    // Equivalent to iszero(eq(div(xx, x), x)) here.
                    if shr(128, x) {
                        revert(0, 0)
                    }

                    // Store x squared.
                    let xx := mul(x, x)

                    // Round to the nearest number.
                    let xxRound := add(xx, half)

                    // Revert if xx + half overflowed.
                    if lt(xxRound, xx) {
                        revert(0, 0)
                    }

                    // Set x to scaled xxRound.
                    x := div(xxRound, scalar)

                    // If n is even:
                    if mod(n, 2) {
                        // Compute z * x.
                        let zx := mul(z, x)

                        // If z * x overflowed:
                        if iszero(eq(div(zx, x), z)) {
                            // Revert if x is non-zero.
                            if iszero(iszero(x)) {
                                revert(0, 0)
                            }
                        }

                        // Round to the nearest number.
                        let zxRound := add(zx, half)

                        // Revert if zx + half overflowed.
                        if lt(zxRound, zx) {
                            revert(0, 0)
                        }

                        // Return properly scaled zxRound.
                        z := div(zxRound, scalar)
                    }
                }
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                        GENERAL NUMBER UTILITIES
    //////////////////////////////////////////////////////////////*/

    function sqrt(uint256 x) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            let y := x // We start y at x, which will help us make our initial estimate.

            z := 181 // The "correct" value is 1, but this saves a multiplication later.

            // This segment is to get a reasonable initial estimate for the Babylonian method. With a bad
            // start, the correct # of bits increases ~linearly each iteration instead of ~quadratically.

            // We check y >= 2^(k + 8) but shift right by k bits
            // each branch to ensure that if x >= 256, then y >= 256.
            if iszero(lt(y, 0x10000000000000000000000000000000000)) {
                y := shr(128, y)
                z := shl(64, z)
            }
            if iszero(lt(y, 0x1000000000000000000)) {
                y := shr(64, y)
                z := shl(32, z)
            }
            if iszero(lt(y, 0x10000000000)) {
                y := shr(32, y)
                z := shl(16, z)
            }
            if iszero(lt(y, 0x1000000)) {
                y := shr(16, y)
                z := shl(8, z)
            }

            // Goal was to get z*z*y within a small factor of x. More iterations could
            // get y in a tighter range. Currently, we will have y in [256, 256*2^16).
            // We ensured y >= 256 so that the relative difference between y and y+1 is small.
            // That's not possible if x < 256 but we can just verify those cases exhaustively.

            // Now, z*z*y <= x < z*z*(y+1), and y <= 2^(16+8), and either y >= 256, or x < 256.
            // Correctness can be checked exhaustively for x < 256, so we assume y >= 256.
            // Then z*sqrt(y) is within sqrt(257)/sqrt(256) of sqrt(x), or about 20bps.

            // For s in the range [1/256, 256], the estimate f(s) = (181/1024) * (s+1) is in the range
            // (1/2.84 * sqrt(s), 2.84 * sqrt(s)), with largest error when s = 1 and when s = 256 or 1/256.

            // Since y is in [256, 256*2^16), let a = y/65536, so that a is in [1/256, 256). Then we can estimate
            // sqrt(y) using sqrt(65536) * 181/1024 * (a + 1) = 181/4 * (y + 65536)/65536 = 181 * (y + 65536)/2^18.

            // There is no overflow risk here since y < 2^136 after the first branch above.
            z := shr(18, mul(z, add(y, 65536))) // A mul() is saved from starting z at 181.

            // Given the worst case multiplicative error of 2.84 above, 7 iterations should be enough.
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))

            // If x+1 is a perfect square, the Babylonian method cycles between
            // floor(sqrt(x)) and ceil(sqrt(x)). This statement ensures we return floor.
            // See: https://en.wikipedia.org/wiki/Integer_square_root#Using_only_integer_division
            // Since the ceil is rare, we save gas on the assignment and repeat division in the rare case.
            // If you don't care whether the floor or ceil square root is returned, you can remove this statement.
            z := sub(z, lt(div(x, z), z))
        }
    }

    function unsafeMod(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Mod x by y. Note this will return
            // 0 instead of reverting if y is zero.
            z := mod(x, y)
        }
    }

    function unsafeDiv(uint256 x, uint256 y) internal pure returns (uint256 r) {
        /// @solidity memory-safe-assembly
        assembly {
            // Divide x by y. Note this will return
            // 0 instead of reverting if y is zero.
            r := div(x, y)
        }
    }

    function unsafeDivUp(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Add 1 to x * y if x % y > 0. Note this will
            // return 0 instead of reverting if y is zero.
            z := add(gt(mod(x, y), 0), div(x, y))
        }
    }
}

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

import "./AggregatorInterface.sol";
import "./AggregatorV3Interface.sol";

interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface {}

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

interface AggregatorInterface {
  function latestAnswer() external view returns (int256);

  function latestTimestamp() external view returns (uint256);

  function latestRound() external view returns (uint256);

  function getAnswer(uint256 roundId) external view returns (int256);

  function getTimestamp(uint256 roundId) external view returns (uint256);

  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);

  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

// 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
    );
}

{
  "remappings": [
    "@solmate/=lib/solmate/src/",
    "@forge-std/=lib/forge-std/src/",
    "@ds-test/=lib/forge-std/lib/ds-test/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "@uniswap/v3-periphery/=lib/v3-periphery/",
    "@uniswap/v3-core/=lib/v3-core/",
    "@chainlink/=lib/chainlink/",
    "@uniswapV3P/=lib/v3-periphery/contracts/",
    "@uniswapV3C/=lib/v3-core/contracts/",
    "@balancer/=lib/balancer-v2-monorepo/pkg/",
    "@ccip/=lib/ccip/",
    "@balancer-labs/=lib/balancer-v2-monorepo/../../node_modules/@balancer-labs/",
    "axelar-gmp-sdk-solidity/=lib/axelar-gmp-sdk-solidity/contracts/",
    "balancer-v2-monorepo/=lib/balancer-v2-monorepo/",
    "ccip/=lib/ccip/contracts/",
    "chainlink/=lib/chainlink/integration-tests/contracts/ethereum/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "pendle-core-v2-public/=lib/pendle-core-v2-public/contracts/",
    "solmate/=lib/solmate/src/",
    "v3-core/=lib/v3-core/contracts/",
    "v3-periphery/=lib/v3-periphery/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ERC4626","name":"_target","type":"address"},{"internalType":"uint64","name":"_heartbeat","type":"uint64"},{"internalType":"uint64","name":"_deviationTrigger","type":"uint64"},{"internalType":"uint64","name":"_gracePeriod","type":"uint64"},{"internalType":"uint16","name":"_observationsToUse","type":"uint16"},{"internalType":"address","name":"_automationRegistry","type":"address"},{"internalType":"address","name":"_automationRegistrar","type":"address"},{"internalType":"address","name":"_automationAdmin","type":"address"},{"internalType":"address","name":"_link","type":"address"},{"internalType":"uint216","name":"_startingAnswer","type":"uint216"},{"internalType":"uint256","name":"_allowedAnswerChangeLower","type":"uint256"},{"internalType":"uint256","name":"_allowedAnswerChangeUpper","type":"uint256"},{"internalType":"address","name":"_sequencerUptimeFeed","type":"address"},{"internalType":"uint64","name":"_sequencerGracePeriod","type":"uint64"}],"internalType":"struct ERC4626SharePriceOracle.ConstructorArgs","name":"args","type":"tuple"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ERC4626SharePriceOracle__AlreadyInitialized","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__ContractKillSwitch","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__CumulativeTooLarge","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__FuturePerformData","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__NoPendingUpkeepToHandle","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__NoUpkeepConditionMet","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__OnlyCallableByAutomationForwarder","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__ParamHashDiffers","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__SharePriceTooLarge","type":"error"},{"inputs":[],"name":"ERC4626SharePriceOracle__StalePerformData","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"reportedAnswer","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minAnswer","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maxAnswer","type":"uint256"}],"name":"KillSwitchActivated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"timeUpdated","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timeAnswerCalculated","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"latestAnswer","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timeWeightedAverageAnswer","type":"uint256"},{"indexed":false,"internalType":"bool","name":"isNotSafeToUse","type":"bool"}],"name":"OracleUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"upkeepParamHash","type":"bytes32"}],"name":"UpkeepPending","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"upkeepId","type":"uint256"},{"indexed":false,"internalType":"address","name":"forwarder","type":"address"}],"name":"UpkeepRegistered","type":"event"},{"inputs":[],"name":"ONE_SHARE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"UPKEEP_GAS_LIMIT","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"allowedAnswerChangeLower","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"allowedAnswerChangeUpper","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"answer","outputs":[{"internalType":"uint216","name":"","type":"uint216"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"automationAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"automationForwarder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"automationRegistrar","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"automationRegistry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"checkUpkeep","outputs":[{"internalType":"bool","name":"upkeepNeeded","type":"bool"},{"internalType":"bytes","name":"performData","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentIndex","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"deviationTrigger","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLatest","outputs":[{"internalType":"uint256","name":"ans","type":"uint256"},{"internalType":"uint256","name":"timeWeightedAverageAnswer","type":"uint256"},{"internalType":"bool","name":"notSafeToUse","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLatestAnswer","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gracePeriod","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_upkeepId","type":"uint256"}],"name":"handlePendingUpkeep","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"heartbeat","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint96","name":"initialUpkeepFunds","type":"uint96"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"killSwitch","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"link","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"observations","outputs":[{"internalType":"uint64","name":"timestamp","type":"uint64"},{"internalType":"uint192","name":"cumulative","type":"uint192"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"observationsLength","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingUpkeepParamHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"performData","type":"bytes"}],"name":"performUpkeep","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"sequencerGracePeriod","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"target","outputs":[{"internalType":"contract ERC4626","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"targetDecimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"}]

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

-----Decoded View---------------
Arg [0] : args (tuple): 
     Arg [1] : _target (address): 0xeA1A6307D9b18F8d1cbf1c3Dd6aad8416C06a221
     Arg [2] : _heartbeat (uint64): 86400
     Arg [3] : _deviationTrigger (uint64): 50
     Arg [4] : _gracePeriod (uint64): 28800
     Arg [5] : _observationsToUse (uint16): 6
     Arg [6] : _automationRegistry (address): 0x6593c7De001fC8542bB1703532EE1E5aA0D458fD
     Arg [7] : _automationRegistrar (address): 0x6B0B234fB2f380309D47A7E9391E29E9a179395a
     Arg [8] : _automationAdmin (address): 0x2322ba43eFF1542b6A7bAeD35e66099Ea0d12Bd1
     Arg [9] : _link (address): 0x514910771AF9Ca656af840dff83E8264EcF986CA
     Arg [10] : _startingAnswer (uint216): 1000000000000000000
     Arg [11] : _allowedAnswerChangeLower (uint256): 7500
     Arg [12] : _allowedAnswerChangeUpper (uint256): 12500
     Arg [13] : _sequencerUptimeFeed (address): 0x0000000000000000000000000000000000000000
     Arg [14] : _sequencerGracePeriod (uint64): 0


-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 000000000000000000000000ea1a6307d9b18f8d1cbf1c3dd6aad8416c06a221
Arg [1] : 0000000000000000000000000000000000000000000000000000000000015180
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000032
Arg [3] : 0000000000000000000000000000000000000000000000000000000000007080
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [5] : 0000000000000000000000006593c7de001fc8542bb1703532ee1e5aa0d458fd
Arg [6] : 0000000000000000000000006b0b234fb2f380309d47a7e9391e29e9a179395a
Arg [7] : 0000000000000000000000002322ba43eff1542b6a7baed35e66099ea0d12bd1
Arg [8] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca
Arg [9] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000001d4c
Arg [11] : 00000000000000000000000000000000000000000000000000000000000030d4
Arg [12] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000000