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// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.23;

import { IERC20 } from "oz/interfaces/IERC20.sol";
import { IERC4626 } from "interfaces/external/IERC4626.sol";
import { SafeERC20 } from "oz/token/ERC20/utils/SafeERC20.sol";
import { SafeCast } from "oz/utils/math/SafeCast.sol";

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

import { AccessControl, IAccessControlManager } from "../utils/AccessControl.sol";
import "../utils/Constants.sol";
import "../utils/Errors.sol";

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

struct CollatParams {
    // Vault associated to the collateral
    address vault;
    // Target exposure to the collateral asset used in the vault
    uint64 targetExposure;
    // Maximum exposure within the Transmuter to the vault asset
    uint64 maxExposureYieldAsset;
    // Minimum exposure within the Transmuter to the vault asset
    uint64 minExposureYieldAsset;
    // Whether limit exposures should be overriden or read onchain through the Transmuter
    // This value should be 1 to override exposures or 2 if these shouldn't be overriden
    uint64 overrideExposures;
}

/// @title Harvester
/// @author Angle Labs, Inc.
/// @dev Contract for anyone to permissionlessly adjust the reserves of Angle Transmuter through
/// the RebalancerFlashloan contract
contract Harvester is AccessControl {
    using SafeERC20 for IERC20;
    using SafeCast for uint256;

    /// @notice Reference to the `transmuter` implementation this contract aims at rebalancing
    ITransmuter public immutable TRANSMUTER;
    /// @notice Permissioned rebalancer contract
    RebalancerFlashloan public rebalancer;
    /// @notice Max slippage when dealing with the Transmuter
    uint96 public maxSlippage;
    /// @notice Data associated to a collateral
    mapping(address => CollatParams) public collateralData;

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                    INITIALIZATION                                                  
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    constructor(
        address _rebalancer,
        address vault,
        uint64 targetExposure,
        uint64 overrideExposures,
        uint64 maxExposureYieldAsset,
        uint64 minExposureYieldAsset,
        uint96 _maxSlippage
    ) {
        ITransmuter transmuter = RebalancerFlashloan(_rebalancer).TRANSMUTER();
        TRANSMUTER = transmuter;
        rebalancer = RebalancerFlashloan(_rebalancer);
        accessControlManager = IAccessControlManager(transmuter.accessControlManager());
        _setCollateralData(vault, targetExposure, minExposureYieldAsset, maxExposureYieldAsset, overrideExposures);
        _setMaxSlippage(_maxSlippage);
    }

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                        HARVEST                                                     
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Invests or divests from the yield asset associated to `collateral` based on the current exposure to this
    /// collateral
    /// @dev This transaction either reduces the exposure to `collateral` in the Transmuter or frees up some collateral
    /// that can then be used for people looking to burn stablecoins
    /// @dev Due to potential transaction fees within the Transmuter, this function doesn't exactly bring `collateral`
    /// to the target exposure
    /// @dev The `harvest` possibility shouldn't be implemented for assets with a manipulable price (like ERC4626)
    /// contracts on which the `previewRedeem` values can be easily moved by creating a loss or a profit
    function harvest(address collateral) external {
        (uint256 stablecoinsFromCollateral, uint256 stablecoinsIssued) = TRANSMUTER.getIssuedByCollateral(collateral);
        CollatParams memory collatInfo = collateralData[collateral];
        (uint256 stablecoinsFromVault, ) = TRANSMUTER.getIssuedByCollateral(collatInfo.vault);
        uint8 increase;
        uint256 amount;
        uint256 targetExposureScaled = collatInfo.targetExposure * stablecoinsIssued;
        if (stablecoinsFromCollateral * 1e9 > targetExposureScaled) {
            // Need to increase exposure to yield bearing asset
            increase = 1;
            amount = stablecoinsFromCollateral - targetExposureScaled / 1e9;
            uint256 maxValueScaled = collatInfo.maxExposureYieldAsset * stablecoinsIssued;
            // These checks assume that there are no transaction fees on the stablecoin->collateral conversion and so
            // it's still possible that exposure goes above the max exposure in some rare cases
            if (stablecoinsFromVault * 1e9 > maxValueScaled) amount = 0;
            else if ((stablecoinsFromVault + amount) * 1e9 > maxValueScaled)
                amount = maxValueScaled / 1e9 - stablecoinsFromVault;
        } else {
            // In this case, exposure after the operation might remain slightly below the targetExposure as less
            // collateral may be obtained by burning stablecoins for the yield asset and unwrapping it
            amount = targetExposureScaled / 1e9 - stablecoinsFromCollateral;
            uint256 minValueScaled = collatInfo.minExposureYieldAsset * stablecoinsIssued;
            if (stablecoinsFromVault * 1e9 < minValueScaled) amount = 0;
            else if (stablecoinsFromVault * 1e9 < minValueScaled + amount * 1e9)
                amount = stablecoinsFromVault - minValueScaled / 1e9;
        }
        if (amount > 0) {
            try TRANSMUTER.updateOracle(collatInfo.vault) {} catch {}

            rebalancer.adjustYieldExposure(
                amount,
                increase,
                collateral,
                collatInfo.vault,
                (amount * (1e9 - maxSlippage)) / 1e9
            );
        }
    }

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                        SETTERS                                                     
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    function setRebalancer(address _newRebalancer) external onlyGuardian {
        if (_newRebalancer == address(0)) revert ZeroAddress();
        rebalancer = RebalancerFlashloan(_newRebalancer);
    }

    /// @dev This function shouldn't be called for a vault (e.g an ERC4626 token) which price can be easily moved
    /// by creating a loss or a profit, at the risk of depleting the reserves available in the Rebalancer
    function setCollateralData(
        address vault,
        uint64 targetExposure,
        uint64 minExposureYieldAsset,
        uint64 maxExposureYieldAsset,
        uint64 overrideExposures
    ) external onlyGuardian {
        _setCollateralData(vault, targetExposure, minExposureYieldAsset, maxExposureYieldAsset, overrideExposures);
    }

    function setMaxSlippage(uint96 _maxSlippage) external onlyGuardian {
        _setMaxSlippage(_maxSlippage);
    }

    function updateLimitExposuresYieldAsset(address collateral) external {
        CollatParams storage collatInfo = collateralData[collateral];
        if (collatInfo.overrideExposures == 2) _updateLimitExposuresYieldAsset(collatInfo);
    }

    function _setMaxSlippage(uint96 _maxSlippage) internal {
        if (_maxSlippage > 1e9) revert InvalidParam();
        maxSlippage = _maxSlippage;
    }

    function _setCollateralData(
        address vault,
        uint64 targetExposure,
        uint64 minExposureYieldAsset,
        uint64 maxExposureYieldAsset,
        uint64 overrideExposures
    ) internal {
        address collateral = address(IERC4626(vault).asset());
        CollatParams storage collatInfo = collateralData[collateral];
        collatInfo.vault = vault;
        if (targetExposure >= 1e9) revert InvalidParam();
        collatInfo.targetExposure = targetExposure;
        collatInfo.overrideExposures = overrideExposures;
        if (overrideExposures == 1) {
            if (maxExposureYieldAsset >= 1e9 || minExposureYieldAsset >= maxExposureYieldAsset) revert InvalidParam();
            collatInfo.maxExposureYieldAsset = maxExposureYieldAsset;
            collatInfo.minExposureYieldAsset = minExposureYieldAsset;
        } else {
            collatInfo.overrideExposures = 2;
            _updateLimitExposuresYieldAsset(collatInfo);
        }
    }

    function _updateLimitExposuresYieldAsset(CollatParams storage collatInfo) internal {
        uint64[] memory xFeeMint;
        (xFeeMint, ) = TRANSMUTER.getCollateralMintFees(collatInfo.vault);
        uint256 length = xFeeMint.length;
        if (length <= 1) collatInfo.maxExposureYieldAsset = 1e9;
        else collatInfo.maxExposureYieldAsset = xFeeMint[length - 2];

        uint64[] memory xFeeBurn;
        (xFeeBurn, ) = TRANSMUTER.getCollateralBurnFees(collatInfo.vault);
        length = xFeeBurn.length;
        if (length <= 1) collatInfo.minExposureYieldAsset = 0;
        else collatInfo.minExposureYieldAsset = xFeeBurn[length - 2];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: GPL-3.0

// OpenZeppelin Contracts (last updated v4.7.0) (interfaces/IERC4626.sol)

pragma solidity >=0.5.0;

/// @notice ERC4626 interface
/// @author OpenZeppelin
/// @dev In this implementation, the interface only contains the functions that the IERC4626 interface adds on top of
/// the IERC20 interface
interface IERC4626 {
    /**
     * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
     *
     * - MUST be an ERC-20 token contract.
     * - MUST NOT revert.
     */
    function asset() external view returns (address assetTokenAddress);

    /**
     * @dev Returns the total amount of the underlying asset that is “managed” by Vault.
     *
     * - SHOULD include any compounding that occurs from yield.
     * - MUST be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT revert.
     */
    function totalAssets() external view returns (uint256 totalManagedAssets);

    /**
     * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToShares(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToAssets(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
     * through a deposit call.
     *
     * - MUST return a limited value if receiver is subject to some deposit limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
     * - MUST NOT revert.
     */
    function maxDeposit(address receiver) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
     *   call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
     *   in the same transaction.
     * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
     *   deposit would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewDeposit(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   deposit execution, and are accounted for during deposit.
     * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
     * - MUST return a limited value if receiver is subject to some mint limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
     * - MUST NOT revert.
     */
    function maxMint(address receiver) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
     *   in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
     *   same transaction.
     * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
     *   would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by minting.
     */
    function previewMint(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
     *   execution, and are accounted for during mint.
     * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function mint(uint256 shares, address receiver) external returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
     * Vault, through a withdraw call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxWithdraw(address owner) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
     *   call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
     *   called
     *   in the same transaction.
     * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
     *   the withdrawal would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   withdraw execution, and are accounted for during withdraw.
     * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
     * through a redeem call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxRedeem(address owner) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
     *   in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
     *   same transaction.
     * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
     *   redemption would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by redeeming.
     */
    function previewRedeem(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   redeem execution, and are accounted for during redeem.
     * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/math/SafeCast.sol)

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint248 from uint256, reverting on
     * overflow (when the input is greater than largest uint248).
     *
     * Counterpart to Solidity's `uint248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toUint248(uint256 value) internal pure returns (uint248) {
        require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits");
        return uint248(value);
    }

    /**
     * @dev Returns the downcasted uint240 from uint256, reverting on
     * overflow (when the input is greater than largest uint240).
     *
     * Counterpart to Solidity's `uint240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toUint240(uint256 value) internal pure returns (uint240) {
        require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits");
        return uint240(value);
    }

    /**
     * @dev Returns the downcasted uint232 from uint256, reverting on
     * overflow (when the input is greater than largest uint232).
     *
     * Counterpart to Solidity's `uint232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toUint232(uint256 value) internal pure returns (uint232) {
        require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits");
        return uint232(value);
    }

    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.2._
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint216 from uint256, reverting on
     * overflow (when the input is greater than largest uint216).
     *
     * Counterpart to Solidity's `uint216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toUint216(uint256 value) internal pure returns (uint216) {
        require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits");
        return uint216(value);
    }

    /**
     * @dev Returns the downcasted uint208 from uint256, reverting on
     * overflow (when the input is greater than largest uint208).
     *
     * Counterpart to Solidity's `uint208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toUint208(uint256 value) internal pure returns (uint208) {
        require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits");
        return uint208(value);
    }

    /**
     * @dev Returns the downcasted uint200 from uint256, reverting on
     * overflow (when the input is greater than largest uint200).
     *
     * Counterpart to Solidity's `uint200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toUint200(uint256 value) internal pure returns (uint200) {
        require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits");
        return uint200(value);
    }

    /**
     * @dev Returns the downcasted uint192 from uint256, reverting on
     * overflow (when the input is greater than largest uint192).
     *
     * Counterpart to Solidity's `uint192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toUint192(uint256 value) internal pure returns (uint192) {
        require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits");
        return uint192(value);
    }

    /**
     * @dev Returns the downcasted uint184 from uint256, reverting on
     * overflow (when the input is greater than largest uint184).
     *
     * Counterpart to Solidity's `uint184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toUint184(uint256 value) internal pure returns (uint184) {
        require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits");
        return uint184(value);
    }

    /**
     * @dev Returns the downcasted uint176 from uint256, reverting on
     * overflow (when the input is greater than largest uint176).
     *
     * Counterpart to Solidity's `uint176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toUint176(uint256 value) internal pure returns (uint176) {
        require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits");
        return uint176(value);
    }

    /**
     * @dev Returns the downcasted uint168 from uint256, reverting on
     * overflow (when the input is greater than largest uint168).
     *
     * Counterpart to Solidity's `uint168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toUint168(uint256 value) internal pure returns (uint168) {
        require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits");
        return uint168(value);
    }

    /**
     * @dev Returns the downcasted uint160 from uint256, reverting on
     * overflow (when the input is greater than largest uint160).
     *
     * Counterpart to Solidity's `uint160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toUint160(uint256 value) internal pure returns (uint160) {
        require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits");
        return uint160(value);
    }

    /**
     * @dev Returns the downcasted uint152 from uint256, reverting on
     * overflow (when the input is greater than largest uint152).
     *
     * Counterpart to Solidity's `uint152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toUint152(uint256 value) internal pure returns (uint152) {
        require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits");
        return uint152(value);
    }

    /**
     * @dev Returns the downcasted uint144 from uint256, reverting on
     * overflow (when the input is greater than largest uint144).
     *
     * Counterpart to Solidity's `uint144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toUint144(uint256 value) internal pure returns (uint144) {
        require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits");
        return uint144(value);
    }

    /**
     * @dev Returns the downcasted uint136 from uint256, reverting on
     * overflow (when the input is greater than largest uint136).
     *
     * Counterpart to Solidity's `uint136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toUint136(uint256 value) internal pure returns (uint136) {
        require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits");
        return uint136(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v2.5._
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint120 from uint256, reverting on
     * overflow (when the input is greater than largest uint120).
     *
     * Counterpart to Solidity's `uint120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toUint120(uint256 value) internal pure returns (uint120) {
        require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits");
        return uint120(value);
    }

    /**
     * @dev Returns the downcasted uint112 from uint256, reverting on
     * overflow (when the input is greater than largest uint112).
     *
     * Counterpart to Solidity's `uint112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toUint112(uint256 value) internal pure returns (uint112) {
        require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits");
        return uint112(value);
    }

    /**
     * @dev Returns the downcasted uint104 from uint256, reverting on
     * overflow (when the input is greater than largest uint104).
     *
     * Counterpart to Solidity's `uint104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toUint104(uint256 value) internal pure returns (uint104) {
        require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
        return uint104(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.2._
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint88 from uint256, reverting on
     * overflow (when the input is greater than largest uint88).
     *
     * Counterpart to Solidity's `uint88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toUint88(uint256 value) internal pure returns (uint88) {
        require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits");
        return uint88(value);
    }

    /**
     * @dev Returns the downcasted uint80 from uint256, reverting on
     * overflow (when the input is greater than largest uint80).
     *
     * Counterpart to Solidity's `uint80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toUint80(uint256 value) internal pure returns (uint80) {
        require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits");
        return uint80(value);
    }

    /**
     * @dev Returns the downcasted uint72 from uint256, reverting on
     * overflow (when the input is greater than largest uint72).
     *
     * Counterpart to Solidity's `uint72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toUint72(uint256 value) internal pure returns (uint72) {
        require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits");
        return uint72(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v2.5._
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint56 from uint256, reverting on
     * overflow (when the input is greater than largest uint56).
     *
     * Counterpart to Solidity's `uint56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toUint56(uint256 value) internal pure returns (uint56) {
        require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits");
        return uint56(value);
    }

    /**
     * @dev Returns the downcasted uint48 from uint256, reverting on
     * overflow (when the input is greater than largest uint48).
     *
     * Counterpart to Solidity's `uint48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toUint48(uint256 value) internal pure returns (uint48) {
        require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits");
        return uint48(value);
    }

    /**
     * @dev Returns the downcasted uint40 from uint256, reverting on
     * overflow (when the input is greater than largest uint40).
     *
     * Counterpart to Solidity's `uint40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toUint40(uint256 value) internal pure returns (uint40) {
        require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits");
        return uint40(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v2.5._
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint24 from uint256, reverting on
     * overflow (when the input is greater than largest uint24).
     *
     * Counterpart to Solidity's `uint24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toUint24(uint256 value) internal pure returns (uint24) {
        require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits");
        return uint24(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v2.5._
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v2.5._
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     *
     * _Available since v3.0._
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int248 from int256, reverting on
     * overflow (when the input is less than smallest int248 or
     * greater than largest int248).
     *
     * Counterpart to Solidity's `int248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toInt248(int256 value) internal pure returns (int248) {
        require(value >= type(int248).min && value <= type(int248).max, "SafeCast: value doesn't fit in 248 bits");
        return int248(value);
    }

    /**
     * @dev Returns the downcasted int240 from int256, reverting on
     * overflow (when the input is less than smallest int240 or
     * greater than largest int240).
     *
     * Counterpart to Solidity's `int240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toInt240(int256 value) internal pure returns (int240) {
        require(value >= type(int240).min && value <= type(int240).max, "SafeCast: value doesn't fit in 240 bits");
        return int240(value);
    }

    /**
     * @dev Returns the downcasted int232 from int256, reverting on
     * overflow (when the input is less than smallest int232 or
     * greater than largest int232).
     *
     * Counterpart to Solidity's `int232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toInt232(int256 value) internal pure returns (int232) {
        require(value >= type(int232).min && value <= type(int232).max, "SafeCast: value doesn't fit in 232 bits");
        return int232(value);
    }

    /**
     * @dev Returns the downcasted int224 from int256, reverting on
     * overflow (when the input is less than smallest int224 or
     * greater than largest int224).
     *
     * Counterpart to Solidity's `int224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.7._
     */
    function toInt224(int256 value) internal pure returns (int224) {
        require(value >= type(int224).min && value <= type(int224).max, "SafeCast: value doesn't fit in 224 bits");
        return int224(value);
    }

    /**
     * @dev Returns the downcasted int216 from int256, reverting on
     * overflow (when the input is less than smallest int216 or
     * greater than largest int216).
     *
     * Counterpart to Solidity's `int216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toInt216(int256 value) internal pure returns (int216) {
        require(value >= type(int216).min && value <= type(int216).max, "SafeCast: value doesn't fit in 216 bits");
        return int216(value);
    }

    /**
     * @dev Returns the downcasted int208 from int256, reverting on
     * overflow (when the input is less than smallest int208 or
     * greater than largest int208).
     *
     * Counterpart to Solidity's `int208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toInt208(int256 value) internal pure returns (int208) {
        require(value >= type(int208).min && value <= type(int208).max, "SafeCast: value doesn't fit in 208 bits");
        return int208(value);
    }

    /**
     * @dev Returns the downcasted int200 from int256, reverting on
     * overflow (when the input is less than smallest int200 or
     * greater than largest int200).
     *
     * Counterpart to Solidity's `int200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toInt200(int256 value) internal pure returns (int200) {
        require(value >= type(int200).min && value <= type(int200).max, "SafeCast: value doesn't fit in 200 bits");
        return int200(value);
    }

    /**
     * @dev Returns the downcasted int192 from int256, reverting on
     * overflow (when the input is less than smallest int192 or
     * greater than largest int192).
     *
     * Counterpart to Solidity's `int192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toInt192(int256 value) internal pure returns (int192) {
        require(value >= type(int192).min && value <= type(int192).max, "SafeCast: value doesn't fit in 192 bits");
        return int192(value);
    }

    /**
     * @dev Returns the downcasted int184 from int256, reverting on
     * overflow (when the input is less than smallest int184 or
     * greater than largest int184).
     *
     * Counterpart to Solidity's `int184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toInt184(int256 value) internal pure returns (int184) {
        require(value >= type(int184).min && value <= type(int184).max, "SafeCast: value doesn't fit in 184 bits");
        return int184(value);
    }

    /**
     * @dev Returns the downcasted int176 from int256, reverting on
     * overflow (when the input is less than smallest int176 or
     * greater than largest int176).
     *
     * Counterpart to Solidity's `int176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toInt176(int256 value) internal pure returns (int176) {
        require(value >= type(int176).min && value <= type(int176).max, "SafeCast: value doesn't fit in 176 bits");
        return int176(value);
    }

    /**
     * @dev Returns the downcasted int168 from int256, reverting on
     * overflow (when the input is less than smallest int168 or
     * greater than largest int168).
     *
     * Counterpart to Solidity's `int168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toInt168(int256 value) internal pure returns (int168) {
        require(value >= type(int168).min && value <= type(int168).max, "SafeCast: value doesn't fit in 168 bits");
        return int168(value);
    }

    /**
     * @dev Returns the downcasted int160 from int256, reverting on
     * overflow (when the input is less than smallest int160 or
     * greater than largest int160).
     *
     * Counterpart to Solidity's `int160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toInt160(int256 value) internal pure returns (int160) {
        require(value >= type(int160).min && value <= type(int160).max, "SafeCast: value doesn't fit in 160 bits");
        return int160(value);
    }

    /**
     * @dev Returns the downcasted int152 from int256, reverting on
     * overflow (when the input is less than smallest int152 or
     * greater than largest int152).
     *
     * Counterpart to Solidity's `int152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toInt152(int256 value) internal pure returns (int152) {
        require(value >= type(int152).min && value <= type(int152).max, "SafeCast: value doesn't fit in 152 bits");
        return int152(value);
    }

    /**
     * @dev Returns the downcasted int144 from int256, reverting on
     * overflow (when the input is less than smallest int144 or
     * greater than largest int144).
     *
     * Counterpart to Solidity's `int144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toInt144(int256 value) internal pure returns (int144) {
        require(value >= type(int144).min && value <= type(int144).max, "SafeCast: value doesn't fit in 144 bits");
        return int144(value);
    }

    /**
     * @dev Returns the downcasted int136 from int256, reverting on
     * overflow (when the input is less than smallest int136 or
     * greater than largest int136).
     *
     * Counterpart to Solidity's `int136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toInt136(int256 value) internal pure returns (int136) {
        require(value >= type(int136).min && value <= type(int136).max, "SafeCast: value doesn't fit in 136 bits");
        return int136(value);
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128) {
        require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits");
        return int128(value);
    }

    /**
     * @dev Returns the downcasted int120 from int256, reverting on
     * overflow (when the input is less than smallest int120 or
     * greater than largest int120).
     *
     * Counterpart to Solidity's `int120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toInt120(int256 value) internal pure returns (int120) {
        require(value >= type(int120).min && value <= type(int120).max, "SafeCast: value doesn't fit in 120 bits");
        return int120(value);
    }

    /**
     * @dev Returns the downcasted int112 from int256, reverting on
     * overflow (when the input is less than smallest int112 or
     * greater than largest int112).
     *
     * Counterpart to Solidity's `int112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toInt112(int256 value) internal pure returns (int112) {
        require(value >= type(int112).min && value <= type(int112).max, "SafeCast: value doesn't fit in 112 bits");
        return int112(value);
    }

    /**
     * @dev Returns the downcasted int104 from int256, reverting on
     * overflow (when the input is less than smallest int104 or
     * greater than largest int104).
     *
     * Counterpart to Solidity's `int104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toInt104(int256 value) internal pure returns (int104) {
        require(value >= type(int104).min && value <= type(int104).max, "SafeCast: value doesn't fit in 104 bits");
        return int104(value);
    }

    /**
     * @dev Returns the downcasted int96 from int256, reverting on
     * overflow (when the input is less than smallest int96 or
     * greater than largest int96).
     *
     * Counterpart to Solidity's `int96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.7._
     */
    function toInt96(int256 value) internal pure returns (int96) {
        require(value >= type(int96).min && value <= type(int96).max, "SafeCast: value doesn't fit in 96 bits");
        return int96(value);
    }

    /**
     * @dev Returns the downcasted int88 from int256, reverting on
     * overflow (when the input is less than smallest int88 or
     * greater than largest int88).
     *
     * Counterpart to Solidity's `int88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toInt88(int256 value) internal pure returns (int88) {
        require(value >= type(int88).min && value <= type(int88).max, "SafeCast: value doesn't fit in 88 bits");
        return int88(value);
    }

    /**
     * @dev Returns the downcasted int80 from int256, reverting on
     * overflow (when the input is less than smallest int80 or
     * greater than largest int80).
     *
     * Counterpart to Solidity's `int80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toInt80(int256 value) internal pure returns (int80) {
        require(value >= type(int80).min && value <= type(int80).max, "SafeCast: value doesn't fit in 80 bits");
        return int80(value);
    }

    /**
     * @dev Returns the downcasted int72 from int256, reverting on
     * overflow (when the input is less than smallest int72 or
     * greater than largest int72).
     *
     * Counterpart to Solidity's `int72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toInt72(int256 value) internal pure returns (int72) {
        require(value >= type(int72).min && value <= type(int72).max, "SafeCast: value doesn't fit in 72 bits");
        return int72(value);
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64) {
        require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits");
        return int64(value);
    }

    /**
     * @dev Returns the downcasted int56 from int256, reverting on
     * overflow (when the input is less than smallest int56 or
     * greater than largest int56).
     *
     * Counterpart to Solidity's `int56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toInt56(int256 value) internal pure returns (int56) {
        require(value >= type(int56).min && value <= type(int56).max, "SafeCast: value doesn't fit in 56 bits");
        return int56(value);
    }

    /**
     * @dev Returns the downcasted int48 from int256, reverting on
     * overflow (when the input is less than smallest int48 or
     * greater than largest int48).
     *
     * Counterpart to Solidity's `int48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toInt48(int256 value) internal pure returns (int48) {
        require(value >= type(int48).min && value <= type(int48).max, "SafeCast: value doesn't fit in 48 bits");
        return int48(value);
    }

    /**
     * @dev Returns the downcasted int40 from int256, reverting on
     * overflow (when the input is less than smallest int40 or
     * greater than largest int40).
     *
     * Counterpart to Solidity's `int40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toInt40(int256 value) internal pure returns (int40) {
        require(value >= type(int40).min && value <= type(int40).max, "SafeCast: value doesn't fit in 40 bits");
        return int40(value);
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32) {
        require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits");
        return int32(value);
    }

    /**
     * @dev Returns the downcasted int24 from int256, reverting on
     * overflow (when the input is less than smallest int24 or
     * greater than largest int24).
     *
     * Counterpart to Solidity's `int24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toInt24(int256 value) internal pure returns (int24) {
        require(value >= type(int24).min && value <= type(int24).max, "SafeCast: value doesn't fit in 24 bits");
        return int24(value);
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16) {
        require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits");
        return int16(value);
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8) {
        require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     *
     * _Available since v3.0._
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
        require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
                      *                                                  █                              
                    *****                                               ▓▓▓                             
                      *                                               ▓▓▓▓▓▓▓                         
                                       *            ///.           ▓▓▓▓▓▓▓▓▓▓▓▓▓                       
                                     *****        ////////            ▓▓▓▓▓▓▓                          
                                       *       /////////////            ▓▓▓                             
                         ▓▓                  //////////////////          █         ▓▓                   
                       ▓▓  ▓▓             ///////////////////////                ▓▓   ▓▓                
                     ▓▓       ▓▓        ////////////////////////////           ▓▓        ▓▓              
                  ▓▓            ▓▓    /////////▓▓▓///////▓▓▓/////////       ▓▓             ▓▓            
                ▓▓                ,////////////////////////////////////// ▓▓                 ▓▓         
              ▓▓                 //////////////////////////////////////////                     ▓▓      
            ▓▓                //////////////////////▓▓▓▓/////////////////////                          
                           ,////////////////////////////////////////////////////                        
                        .//////////////////////////////////////////////////////////                     
                         .//////////////////////////██.,//////////////////////////█                     
                           .//////////////////////████..,./////////////////////██                       
                            ...////////////////███████.....,.////////////////███                        
                              ,.,////////////████████ ........,///////////████                          
                                .,.,//////█████████      ,.......///////████                            
                                   ,..//████████           ........./████                               
                                     ..,██████                .....,███                                 
                                        .██                     ,.,█                                    
                                                                                                    
                                                                                                    
                                                                                                    
                   ▓▓            ▓▓▓▓▓▓▓▓▓▓       ▓▓▓▓▓▓▓▓▓▓        ▓▓               ▓▓▓▓▓▓▓▓▓▓          
                 ▓▓▓▓▓▓          ▓▓▓    ▓▓▓       ▓▓▓               ▓▓               ▓▓   ▓▓▓▓         
               ▓▓▓    ▓▓▓        ▓▓▓    ▓▓▓       ▓▓▓    ▓▓▓        ▓▓               ▓▓▓▓▓             
              ▓▓▓        ▓▓      ▓▓▓    ▓▓▓       ▓▓▓▓▓▓▓▓▓▓        ▓▓▓▓▓▓▓▓▓▓       ▓▓▓▓▓▓▓▓▓▓          
*/

pragma solidity >=0.5.0;

import { IDiamondCut } from "./IDiamondCut.sol";
import { IDiamondEtherscan } from "./IDiamondEtherscan.sol";
import { IDiamondLoupe } from "./IDiamondLoupe.sol";
import { IGetters } from "./IGetters.sol";
import { IRedeemer } from "./IRedeemer.sol";
import { IRewardHandler } from "./IRewardHandler.sol";
import { ISettersGovernor, ISettersGuardian } from "./ISetters.sol";
import { ISwapper } from "./ISwapper.sol";

/// @title ITransmuter
/// @author Angle Labs, Inc.
interface ITransmuter is
    IDiamondCut,
    IDiamondEtherscan,
    IDiamondLoupe,
    IGetters,
    IRedeemer,
    IRewardHandler,
    ISettersGovernor,
    ISettersGuardian,
    ISwapper
{

}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.19;

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

import "../utils/Errors.sol";

/// @title AccessControl
/// @author Angle Labs, Inc.
contract AccessControl {
    /// @notice `accessControlManager` used to check roles
    IAccessControlManager public accessControlManager;

    uint256[49] private __gapAccessControl;

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                       MODIFIERS                                                    
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Checks whether the `msg.sender` has the governor role
    modifier onlyGovernor() {
        if (!accessControlManager.isGovernor(msg.sender)) revert NotGovernor();
        _;
    }

    /// @notice Checks whether the `msg.sender` has the guardian role
    modifier onlyGuardian() {
        if (!accessControlManager.isGovernorOrGuardian(msg.sender)) revert NotGovernorOrGuardian();
        _;
    }

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                       FUNCTIONS                                                    
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Checks whether `admin` has the governor role
    function isGovernor(address admin) external view returns (bool) {
        return accessControlManager.isGovernor(admin);
    }

    /// @notice Checks whether `admin` has the guardian role
    function isGovernorOrGuardian(address admin) external view returns (bool) {
        return accessControlManager.isGovernorOrGuardian(admin);
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.5.0;

import { ICbETH } from "interfaces/external/coinbase/ICbETH.sol";
import { ISfrxETH } from "interfaces/external/frax/ISfrxETH.sol";
import { IStETH } from "interfaces/external/lido/IStETH.sol";
import { IRETH } from "interfaces/external/rocketPool/IRETH.sol";

/*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                 STORAGE SLOTS                                                  
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

/// @dev Storage position of `DiamondStorage` structure
/// @dev Equals `keccak256("diamond.standard.diamond.storage") - 1`
bytes32 constant DIAMOND_STORAGE_POSITION = 0xc8fcad8db84d3cc18b4c41d551ea0ee66dd599cde068d998e57d5e09332c131b;

/// @dev Storage position of `TransmuterStorage` structure
/// @dev Equals `keccak256("diamond.standard.transmuter.storage") - 1`
bytes32 constant TRANSMUTER_STORAGE_POSITION = 0xc1f2f38dde3351ac0a64934139e816326caa800303a1235dc53707d0de05d8bd;

/// @dev Storage position of `ImplementationStorage` structure
/// @dev Equals `keccak256("eip1967.proxy.implementation") - 1`
bytes32 constant IMPLEMENTATION_STORAGE_POSITION = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

/*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                     MATHS                                                      
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

uint256 constant BASE_6 = 1e6;
uint256 constant BASE_8 = 1e8;
uint256 constant BASE_9 = 1e9;
uint256 constant BASE_12 = 1e12;
uint256 constant BPS = 1e14;
uint256 constant BASE_18 = 1e18;
uint256 constant HALF_BASE_27 = 1e27 / 2;
uint256 constant BASE_27 = 1e27;
uint256 constant BASE_36 = 1e36;
uint256 constant MAX_BURN_FEE = 999_000_000;
uint256 constant MAX_MINT_FEE = BASE_12 - 1;

/*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                     REENTRANT                                                      
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint8 constant NOT_ENTERED = 1;
uint8 constant ENTERED = 2;

/*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                               COMMON ADDRESSES                                                 
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

address constant PERMIT_2 = 0x000000000022D473030F116dDEE9F6B43aC78BA3;
address constant ONE_INCH_ROUTER = 0x1111111254EEB25477B68fb85Ed929f73A960582;
address constant AGEUR = 0x1a7e4e63778B4f12a199C062f3eFdD288afCBce8;
ICbETH constant CBETH = ICbETH(0xBe9895146f7AF43049ca1c1AE358B0541Ea49704);
IRETH constant RETH = IRETH(0xae78736Cd615f374D3085123A210448E74Fc6393);
IStETH constant STETH = IStETH(0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84);
ISfrxETH constant SFRXETH = ISfrxETH(0xac3E018457B222d93114458476f3E3416Abbe38F);

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.19;

error AlreadyAdded();
error CannotAddFunctionToDiamondThatAlreadyExists(bytes4 _selector);
error CannotAddSelectorsToZeroAddress(bytes4[] _selectors);
error CannotRemoveFunctionThatDoesNotExist(bytes4 _selector);
error CannotRemoveImmutableFunction(bytes4 _selector);
error CannotReplaceFunctionsFromFacetWithZeroAddress(bytes4[] _selectors);
error CannotReplaceFunctionThatDoesNotExists(bytes4 _selector);
error CannotReplaceFunctionWithTheSameFunctionFromTheSameFacet(bytes4 _selector);
error CannotReplaceImmutableFunction(bytes4 _selector);
error ContractHasNoCode();
error FunctionNotFound(bytes4 _functionSelector);
error IncorrectFacetCutAction(uint8 _action);
error InitializationFunctionReverted(address _initializationContractAddress, bytes _calldata);
error InvalidChainlinkRate();
error InvalidLengths();
error InvalidNegativeFees();
error InvalidOracleType();
error InvalidParam();
error InvalidParams();
error InvalidRate();
error InvalidSwap();
error InvalidTokens();
error ManagerHasAssets();
error NoSelectorsProvidedForFacetForCut(address _facetAddress);
error NotAllowed();
error NotCollateral();
error NotGovernor();
error NotGovernorOrGuardian();
error NotTrusted();
error NotWhitelisted();
error OneInchSwapFailed();
error OracleUpdateFailed();
error Paused();
error ReentrantCall();
error RemoveFacetAddressMustBeZeroAddress(address _facetAddress);
error TooBigAmountIn();
error TooLate();
error TooSmallAmountOut();
error ZeroAddress();
error ZeroAmount();

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.19;

import "./Rebalancer.sol";
import { IERC4626 } from "interfaces/external/IERC4626.sol";
import { IERC3156FlashBorrower } from "oz/interfaces/IERC3156FlashBorrower.sol";
import { IERC3156FlashLender } from "oz/interfaces/IERC3156FlashLender.sol";

/// @title RebalancerFlashloan
/// @author Angle Labs, Inc.
/// @dev Rebalancer contract for a Transmuter with as collaterals a liquid stablecoin and an ERC4626 token
/// using this liquid stablecoin as an asset
contract RebalancerFlashloan is Rebalancer, IERC3156FlashBorrower {
    using SafeERC20 for IERC20;
    using SafeCast for uint256;
    bytes32 public constant CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan");

    /// @notice Angle stablecoin flashloan contract
    IERC3156FlashLender public immutable FLASHLOAN;

    constructor(
        IAccessControlManager _accessControlManager,
        ITransmuter _transmuter,
        IERC3156FlashLender _flashloan
    ) Rebalancer(_accessControlManager, _transmuter) {
        if (address(_flashloan) == address(0)) revert ZeroAddress();
        FLASHLOAN = _flashloan;
        IERC20(AGTOKEN).safeApprove(address(_flashloan), type(uint256).max);
    }

    /// @notice Burns `amountStablecoins` for one collateral asset and mints stablecoins from the proceeds of the
    /// first burn
    /// @dev If `increase` is 1, then the system tries to increase its exposure to the yield bearing asset which means
    /// burning stablecoin for the liquid asset, depositing into the ERC4626 vault, then minting the stablecoin
    /// @dev This function reverts if the second stablecoin mint gives less than `minAmountOut` of stablecoins
    function adjustYieldExposure(
        uint256 amountStablecoins,
        uint8 increase,
        address collateral,
        address vault,
        uint256 minAmountOut
    ) external {
        if (!TRANSMUTER.isTrustedSeller(msg.sender)) revert NotTrusted();
        FLASHLOAN.flashLoan(
            IERC3156FlashBorrower(address(this)),
            address(AGTOKEN),
            amountStablecoins,
            abi.encode(increase, collateral, vault, minAmountOut)
        );
    }

    /// @inheritdoc IERC3156FlashBorrower
    function onFlashLoan(
        address initiator,
        address,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32) {
        if (msg.sender != address(FLASHLOAN) || initiator != address(this) || fee != 0) revert NotTrusted();
        (uint256 typeAction, address collateral, address vault, uint256 minAmountOut) = abi.decode(
            data,
            (uint256, address, address, uint256)
        );
        address tokenOut;
        address tokenIn;
        if (typeAction == 1) {
            // Increase yield exposure action: we bring in the ERC4626 token
            tokenOut = collateral;
            tokenIn = vault;
        } else {
            // Decrease yield exposure action: we bring in the liquid asset
            tokenIn = collateral;
            tokenOut = vault;
        }
        uint256 amountOut = TRANSMUTER.swapExactInput(amount, 0, AGTOKEN, tokenOut, address(this), block.timestamp);
        if (typeAction == 1) {
            // Granting allowance with the collateral for the vault asset
            _adjustAllowance(collateral, vault, amountOut);
            amountOut = IERC4626(vault).deposit(amountOut, address(this));
        } else amountOut = IERC4626(vault).redeem(amountOut, address(this), address(this));
        _adjustAllowance(tokenIn, address(TRANSMUTER), amountOut);
        uint256 amountStableOut = TRANSMUTER.swapExactInput(
            amountOut,
            minAmountOut,
            tokenIn,
            AGTOKEN,
            address(this),
            block.timestamp
        );
        if (amount > amountStableOut) {
            uint256 subsidy = amount - amountStableOut;
            orders[tokenIn][tokenOut].subsidyBudget -= subsidy.toUint112();
            budget -= subsidy;
            emit SubsidyPaid(tokenIn, tokenOut, subsidy);
        }
        return CALLBACK_SUCCESS;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "../transmuter/Storage.sol";

/// @title IDiamondCut
/// @author Angle Labs, Inc.
/// @dev Reference: EIP-2535 Diamonds
/// @dev Forked from https://github.com/mudgen/diamond-3/blob/master/contracts/interfaces/IDiamondCut.sol by mudgen
interface IDiamondCut {
    /// @notice Add/replace/remove any number of functions and optionally execute a function with delegatecall
    /// @param _diamondCut Contains the facet addresses and function selectors
    /// @param _init The address of the contract or facet to execute _calldata
    /// @param _calldata A function call, including function selector and arguments, executed with delegatecall on _init
    function diamondCut(FacetCut[] calldata _diamondCut, address _init, bytes calldata _calldata) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

/// @title IDiamondEtherscan
/// @author Angle Labs, Inc.
interface IDiamondEtherscan {
    /// @notice Sets a dummy implementation with the same layout at the diamond proxy contract with all its facets
    function setDummyImplementation(address _implementation) external;

    /// @notice Address of the dummy implementation used to make the DiamondProxy contract interpretable by Etherscan
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "../transmuter/Storage.sol";

/// @notice IDiamondLoupe
/// @author Angle Labs, Inc.
/// @dev Reference: EIP-2535 Diamonds
/// @dev Forked from https://github.com/mudgen/diamond-3/blob/master/contracts/interfaces/IDiamondLoupe.sol by mudgen

interface IDiamondLoupe {
    /// @notice Gets all facet addresses and their four byte function selectors.
    /// @return facets_ Facet
    function facets() external view returns (Facet[] memory facets_);

    /// @notice Gets all the function selectors supported by a specific facet.
    /// @param _facet The facet address.
    /// @return facetFunctionSelectors_
    function facetFunctionSelectors(address _facet) external view returns (bytes4[] memory facetFunctionSelectors_);

    /// @notice Get all the facet addresses used by a diamond.
    /// @return facetAddresses_
    function facetAddresses() external view returns (address[] memory facetAddresses_);

    /// @notice Gets the facet that supports the given selector.
    /// @dev If facet is not found return address(0).
    /// @param _functionSelector The function selector.
    /// @return facetAddress_ The facet address.
    function facetAddress(bytes4 _functionSelector) external view returns (address facetAddress_);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

import { IAccessControlManager } from "interfaces/IAccessControlManager.sol";
import { IAgToken } from "interfaces/IAgToken.sol";

import "../transmuter/Storage.sol";

/// @title IGetters
/// @author Angle Labs, Inc.
interface IGetters {
    /// @notice Checks whether a given `selector` is actually a valid selector corresponding to a function in one of the
    /// facets of the proxy
    function isValidSelector(bytes4 selector) external view returns (bool);

    /// @notice Reference to the `accessControlManager` contract of the system
    function accessControlManager() external view returns (IAccessControlManager);

    /// @notice Stablecoin minted by transmuter
    function agToken() external view returns (IAgToken);

    /// @notice Returns the list of collateral assets supported by the system
    function getCollateralList() external view returns (address[] memory);

    /// @notice Returns all the info in storage associated to a `collateral`
    function getCollateralInfo(address collateral) external view returns (Collateral memory);

    /// @notice Returns the decimals of a given `collateral`
    function getCollateralDecimals(address collateral) external view returns (uint8);

    /// @notice Returns the `xFee` and `yFee` arrays from which fees are computed when coming to mint
    /// with `collateral`
    function getCollateralMintFees(address collateral) external view returns (uint64[] memory, int64[] memory);

    /// @notice Returns the `xFee` and `yFee` arrays from which fees are computed when coming to burn
    /// for `collateral`
    function getCollateralBurnFees(address collateral) external view returns (uint64[] memory, int64[] memory);

    /// @notice Returns the `xFee` and `yFee` arrays used to compute the penalty factor depending on the collateral
    /// ratio when users come to redeem
    function getRedemptionFees() external view returns (uint64[] memory, int64[] memory);

    /// @notice Returns the collateral ratio of Transmuter in base `10**9` and a rounded version of the total amount
    /// of stablecoins issued
    function getCollateralRatio() external view returns (uint64 collatRatio, uint256 stablecoinsIssued);

    /// @notice Returns the total amount of stablecoins issued through Transmuter
    function getTotalIssued() external view returns (uint256 stablecoinsIssued);

    /// @notice Returns the amount of stablecoins issued from `collateral` and the total amount of stablecoins issued
    /// through Transmuter
    function getIssuedByCollateral(
        address collateral
    ) external view returns (uint256 stablecoinsFromCollateral, uint256 stablecoinsIssued);

    /// @notice Returns if a collateral is "managed" and the associated manager configuration
    function getManagerData(
        address collateral
    ) external view returns (bool isManaged, IERC20[] memory subCollaterals, bytes memory config);

    /// @notice Returns the oracle values associated to `collateral`
    /// @return mint Oracle value to be used for a mint transaction with `collateral`
    /// @return burn Oracle value that will be used for `collateral` for a burn transaction. This value
    /// is then used along with oracle values for all other collateral assets to get a global burn value for the oracle
    /// @return ratio Ratio, in base `10**18` between the oracle value of the `collateral` and its target price.
    /// This value is 10**18 if the oracle is greater than the collateral price
    /// @return minRatio Minimum ratio across all collateral assets between a collateral burn price and its target
    /// price. This value is independent of `collateral` and is used to normalize the burn oracle value for burn
    /// transactions.
    /// @return redemption Oracle value that would be used to price `collateral` when computing the collateral ratio
    /// during a redemption
    function getOracleValues(
        address collateral
    ) external view returns (uint256 mint, uint256 burn, uint256 ratio, uint256 minRatio, uint256 redemption);

    /// @notice Returns the data used to compute oracle values for `collateral`
    /// @return oracleType Type of oracle (Chainlink, external smart contract, ...)
    /// @return targetType Type passed to read the value of the target price
    /// @return oracleData Extra data needed to read the oracle. For Chainlink oracles, this data is supposed to give
    /// the addresses of the Chainlink feeds to read, the stale periods for each feed, ...
    /// @return targetData Extra data needed to read the target price of the asset
    function getOracle(
        address collateral
    )
        external
        view
        returns (
            OracleReadType oracleType,
            OracleReadType targetType,
            bytes memory oracleData,
            bytes memory targetData,
            bytes memory hyperparameters
        );

    /// @notice Returns if the associated functionality is paused or not
    function isPaused(address collateral, ActionType action) external view returns (bool);

    /// @notice Returns if `sender` is trusted to update normalizers
    function isTrusted(address sender) external view returns (bool);

    /// @notice Returns if `sender` is trusted to update sell rewards
    function isTrustedSeller(address sender) external view returns (bool);

    /// @notice Checks whether `sender` has a non null entry in the `isWhitelistedForType` storage mapping
    /// @dev Note that ultimately whitelisting may depend as well on external providers
    function isWhitelistedForType(WhitelistType whitelistType, address sender) external view returns (bool);

    /// @notice Checks whether `sender` can deal with `collateral` during burns and redemptions
    function isWhitelistedForCollateral(address collateral, address sender) external returns (bool);

    /// @notice Checks whether only whitelisted address can deal with `collateral` during burns and redemptions
    function isWhitelistedCollateral(address collateral) external view returns (bool);

    /// @notice Gets the data needed to deal with whitelists for `collateral`
    function getCollateralWhitelistData(address collateral) external view returns (bytes memory);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title IRedeemer
/// @author Angle Labs, Inc.
interface IRedeemer {
    /// @notice Redeems `amount` of stablecoins from the system
    /// @param receiver Address which should be receiving the output tokens
    /// @param deadline Timestamp before which the redemption should have occured
    /// @param minAmountOuts Minimum amount of each token given back in the redemption to obtain
    /// @return tokens List of tokens returned
    /// @return amounts Amount given for each token in the `tokens` array
    function redeem(
        uint256 amount,
        address receiver,
        uint256 deadline,
        uint256[] memory minAmountOuts
    ) external returns (address[] memory tokens, uint256[] memory amounts);

    /// @notice Same as the redeem function above with the additional feature to specify a list of `forfeitTokens` for
    /// which the Transmuter system will not try to do a transfer to `receiver`.
    function redeemWithForfeit(
        uint256 amount,
        address receiver,
        uint256 deadline,
        uint256[] memory minAmountOuts,
        address[] memory forfeitTokens
    ) external returns (address[] memory tokens, uint256[] memory amounts);

    /// @notice Simulate the exact output that a redemption of `amount` of stablecoins would give at a given block
    /// @return tokens List of tokens that would be given
    /// @return amounts Amount that would be obtained for each token in the `tokens` array
    function quoteRedemptionCurve(
        uint256 amount
    ) external view returns (address[] memory tokens, uint256[] memory amounts);

    /// @notice Updates the normalizer variable by `amount`
    function updateNormalizer(uint256 amount, bool increase) external returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title IRewardHandler
/// @author Angle Labs, Inc.
interface IRewardHandler {
    /// @notice Sells some external tokens through a 1inch call
    /// @param minAmountOut Minimum amount of the outToken to get
    /// @param payload Payload to pass to 1inch
    /// @return amountOut Amount obtained of the outToken
    function sellRewards(uint256 minAmountOut, bytes memory payload) external returns (uint256 amountOut);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

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

import "../transmuter/Storage.sol";

/// @title ISettersGovernor
/// @author Angle Labs, Inc.
interface ISettersGovernor {
    /// @notice Recovers `amount` of `token` from the Transmuter contract
    function recoverERC20(address collateral, IERC20 token, address to, uint256 amount) external;

    /// @notice Sets a new access control manager address
    function setAccessControlManager(address _newAccessControlManager) external;

    /// @notice Sets (or unsets) a collateral manager  `collateral`
    function setCollateralManager(address collateral, ManagerStorage memory managerData) external;

    /// @notice Sets the allowance of the contract on `token` for `spender` to `amount`
    function changeAllowance(IERC20 token, address spender, uint256 amount) external;

    /// @notice Changes the trusted status for `sender` when for selling rewards or updating the normalizer
    function toggleTrusted(address sender, TrustedType t) external;

    /// @notice Changes whether a `collateral` can only be handled during burns and redemptions by whitelisted addresses
    /// and sets the data used to read into the whitelist
    function setWhitelistStatus(address collateral, uint8 whitelistStatus, bytes memory whitelistData) external;

    /// @notice Add `collateral` as a supported collateral in the system
    function addCollateral(address collateral) external;

    /// @notice Adjusts the amount of stablecoins issued from `collateral` by `amount`
    function adjustStablecoins(address collateral, uint128 amount, bool increase) external;

    /// @notice Revokes `collateral` from the system
    function revokeCollateral(address collateral) external;

    /// @notice Sets the `oracleConfig` used to read the value of `collateral` for the mint, burn and redemption
    /// operations
    function setOracle(address collateral, bytes memory oracleConfig) external;

    /// @notice Update oracle data for a given `collateral`
    function updateOracle(address collateral) external;
}

/// @title ISettersGovernor
/// @author Angle Labs, Inc.
interface ISettersGuardian {
    /// @notice Changes the pause status for mint or burn transactions for `collateral`
    function togglePause(address collateral, ActionType action) external;

    /// @notice Sets the mint or burn fees for `collateral`
    function setFees(address collateral, uint64[] memory xFee, int64[] memory yFee, bool mint) external;

    /// @notice Sets the parameters for the redemption curve
    function setRedemptionCurveParams(uint64[] memory xFee, int64[] memory yFee) external;

    /// @notice Changes the whitelist status for a collateral with `whitelistType` for an address `who`
    function toggleWhitelist(WhitelistType whitelistType, address who) external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title ISwapper
/// @author Angle Labs, Inc.
interface ISwapper {
    /// @notice Swaps (that is to say mints or burns) an exact amount of `tokenIn` for an amount of `tokenOut`
    /// @param amountIn Amount of `tokenIn` to bring
    /// @param amountOutMin Minimum amount of `tokenOut` to get: if `amountOut` is inferior to this amount, the
    /// function will revert
    /// @param tokenIn Token to bring for the swap
    /// @param tokenOut Token to get out of the swap
    /// @param to Address to which `tokenOut` must be sent
    /// @param deadline Timestamp before which the transaction must be executed
    /// @return amountOut Amount of `tokenOut` obtained through the swap
    function swapExactInput(
        uint256 amountIn,
        uint256 amountOutMin,
        address tokenIn,
        address tokenOut,
        address to,
        uint256 deadline
    ) external returns (uint256 amountOut);

    /// @notice Same as `swapExactInput`, but using Permit2 signatures for `tokenIn`
    /// @dev Can only be used to mint, hence `tokenOut` is not needed
    function swapExactInputWithPermit(
        uint256 amountIn,
        uint256 amountOutMin,
        address tokenIn,
        address to,
        uint256 deadline,
        bytes calldata permitData
    ) external returns (uint256 amountOut);

    /// @notice Swaps (that is to say mints or burns) an amount of `tokenIn` for an exact amount of `tokenOut`
    /// @param amountOut Amount of `tokenOut` to obtain from the swap
    /// @param amountInMax Maximum amount of `tokenIn` to bring in order to get `amountOut` of `tokenOut`
    /// @param tokenIn Token to bring for the swap
    /// @param tokenOut Token to get out of the swap
    /// @param to Address to which `tokenOut` must be sent
    /// @param deadline Timestamp before which the transaction must be executed
    /// @return amountIn Amount of `tokenIn` used to perform the swap
    function swapExactOutput(
        uint256 amountOut,
        uint256 amountInMax,
        address tokenIn,
        address tokenOut,
        address to,
        uint256 deadline
    ) external returns (uint256 amountIn);

    /// @notice Same as `swapExactOutput`, but using Permit2 signatures for `tokenIn`
    /// @dev Can only be used to mint, hence `tokenOut` is not needed
    function swapExactOutputWithPermit(
        uint256 amountOut,
        uint256 amountInMax,
        address tokenIn,
        address to,
        uint256 deadline,
        bytes calldata permitData
    ) external returns (uint256 amountIn);

    /// @notice Simulates what a call to `swapExactInput` with `amountIn` of `tokenIn` for `tokenOut` would give.
    /// If called right before and at the same block, the `amountOut` outputted by this function is exactly the
    /// amount that will be obtained with `swapExactInput`
    function quoteIn(uint256 amountIn, address tokenIn, address tokenOut) external view returns (uint256 amountOut);

    /// @notice Simulates what a call to `swapExactOutput` for `amountOut` of `tokenOut` with `tokenIn` would give.
    /// If called right before and at the same block, the `amountIn` outputted by this function is exactly the
    /// amount that will be obtained with `swapExactOutput`
    function quoteOut(uint256 amountOut, address tokenIn, address tokenOut) external view returns (uint256 amountIn);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title IAccessControlManager
/// @author Angle Labs, Inc.
interface IAccessControlManager {
    /// @notice Checks whether an address is governor of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GOVERNOR_ROLE` or not
    function isGovernor(address admin) external view returns (bool);

    /// @notice Checks whether an address is governor or a guardian of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GUARDIAN_ROLE` or not
    /// @dev Governance should make sure when adding a governor to also give this governor the guardian
    /// role by calling the `addGovernor` function
    function isGovernorOrGuardian(address admin) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title ICbETH
/// @notice Interface for the `cbETH` contract
interface ICbETH {
    function exchangeRate() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title ISfrxETH
/// @notice Interface for the `sfrxETH` contract
interface ISfrxETH {
    function pricePerShare() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title IStETH
/// @notice Interface for the `StETH` contract
interface IStETH {
    function getPooledEthByShares(uint256 _sharesAmount) external view returns (uint256);

    function submit(address) external payable returns (uint256);

    function getSharesByPooledEth(uint256 _ethAmount) external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

/// @title IRETH
/// @notice Interface for the `rETH` contract
interface IRETH {
    function getExchangeRate() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.19;

import { IERC20 } from "oz/interfaces/IERC20.sol";
import { SafeERC20 } from "oz/token/ERC20/utils/SafeERC20.sol";
import { SafeCast } from "oz/utils/math/SafeCast.sol";

import { ITransmuter } from "interfaces/ITransmuter.sol";
import { Order, IRebalancer } from "interfaces/IRebalancer.sol";

import { AccessControl, IAccessControlManager } from "../utils/AccessControl.sol";
import "../utils/Constants.sol";
import "../utils/Errors.sol";

/// @title Rebalancer
/// @author Angle Labs, Inc.
/// @notice Contract built to subsidize rebalances between collateral tokens
/// @dev This contract is meant to "wrap" the Transmuter contract and provide a way for governance to
/// subsidize rebalances between collateral tokens. Rebalances are done through 2 swaps collateral <> agToken.
/// @dev This contract is not meant to hold any transient funds aside from the rebalancing budget
contract Rebalancer is IRebalancer, AccessControl {
    event OrderSet(address indexed tokenIn, address indexed tokenOut, uint256 subsidyBudget, uint256 guaranteedRate);
    event SubsidyPaid(address indexed tokenIn, address indexed tokenOut, uint256 subsidy);

    using SafeERC20 for IERC20;
    using SafeCast for uint256;

    /// @notice Reference to the `transmuter` implementation this contract aims at rebalancing
    ITransmuter public immutable TRANSMUTER;
    /// @notice AgToken handled by the `transmuter` of interest
    address public immutable AGTOKEN;
    /// @notice Maps a `(tokenIn,tokenOut)` pair to details about the subsidy potentially provided on
    /// `tokenIn` to `tokenOut` rebalances
    mapping(address tokenIn => mapping(address tokenOut => Order)) public orders;
    /// @notice Gives the total subsidy budget
    uint256 public budget;

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                    INITIALIZATION                                                  
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Initializes the immutable variables of the contract: `accessControlManager`, `transmuter` and `agToken`
    constructor(IAccessControlManager _accessControlManager, ITransmuter _transmuter) {
        if (address(_accessControlManager) == address(0)) revert ZeroAddress();
        accessControlManager = _accessControlManager;
        TRANSMUTER = _transmuter;
        AGTOKEN = address(_transmuter.agToken());
    }

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                 REBALANCING FUNCTIONS                                              
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc IRebalancer
    /// @dev Contrarily to what is done in the Transmuter contract, here neither of `tokenIn` or `tokenOut`
    /// should be an `agToken`
    /// @dev Can be used even if the subsidy budget is 0, in which case it'll just do 2 Transmuter swaps
    /// @dev The invariant should be that `msg.sender` injects `amountIn` in the transmuter and either the
    /// subsidy is 0 either they receive a subsidy from this contract on top of the output Transmuter up to
    /// the guaranteed amount out
    function swapExactInput(
        uint256 amountIn,
        uint256 amountOutMin,
        address tokenIn,
        address tokenOut,
        address to,
        uint256 deadline
    ) external returns (uint256 amountOut) {
        IERC20(tokenIn).safeTransferFrom(msg.sender, address(this), amountIn);
        // First, dealing with the allowance of the rebalancer to the Transmuter: this allowance is made infinite
        // by default
        _adjustAllowance(tokenIn, address(TRANSMUTER), amountIn);
        // Mint agToken from `tokenIn`
        uint256 amountAgToken = TRANSMUTER.swapExactInput(
            amountIn,
            0,
            tokenIn,
            AGTOKEN,
            address(this),
            block.timestamp
        );
        // Computing if a potential subsidy must be included in the agToken amount to burn
        uint256 subsidy = _getSubsidyAmount(tokenIn, tokenOut, amountAgToken, amountIn);
        if (subsidy > 0) {
            orders[tokenIn][tokenOut].subsidyBudget -= subsidy.toUint112();
            budget -= subsidy;
            amountAgToken += subsidy;

            emit SubsidyPaid(tokenIn, tokenOut, subsidy);
        }
        amountOut = TRANSMUTER.swapExactInput(amountAgToken, amountOutMin, AGTOKEN, tokenOut, to, deadline);
    }

    /// @inheritdoc IRebalancer
    /// @dev This function returns an approximation and not an exact value as the first mint to compute `amountAgToken`
    /// might change the state of the fees slope within the Transmuter that will then be taken into account when
    /// burning the minted agToken.
    function quoteIn(uint256 amountIn, address tokenIn, address tokenOut) external view returns (uint256 amountOut) {
        uint256 amountAgToken = TRANSMUTER.quoteIn(amountIn, tokenIn, AGTOKEN);
        amountAgToken += _getSubsidyAmount(tokenIn, tokenOut, amountAgToken, amountIn);
        amountOut = TRANSMUTER.quoteIn(amountAgToken, AGTOKEN, tokenOut);
    }

    /// @inheritdoc IRebalancer
    /// @dev Note that this minimum amount is guaranteed up to the subsidy budget, and if for a swap the subsidy budget
    /// is not big enough to provide this guaranteed amount out, then less will actually be obtained
    function getGuaranteedAmountOut(
        address tokenIn,
        address tokenOut,
        uint256 amountIn
    ) external view returns (uint256) {
        Order storage order = orders[tokenIn][tokenOut];
        return _getGuaranteedAmountOut(amountIn, order.guaranteedRate, order.decimalsIn, order.decimalsOut);
    }

    /// @notice Internal version of `_getGuaranteedAmountOut`
    function _getGuaranteedAmountOut(
        uint256 amountIn,
        uint256 guaranteedRate,
        uint8 decimalsIn,
        uint8 decimalsOut
    ) internal pure returns (uint256 amountOut) {
        return (amountIn * guaranteedRate * (10 ** decimalsOut)) / (BASE_18 * (10 ** decimalsIn));
    }

    /// @notice Computes the additional subsidy amount in agToken that must be added during the process of a swap
    /// of `amountIn` of `tokenIn` to `tokenOut`
    function _getSubsidyAmount(
        address tokenIn,
        address tokenOut,
        uint256 amountAgToken,
        uint256 amountIn
    ) internal view returns (uint256 subsidy) {
        Order storage order = orders[tokenIn][tokenOut];
        uint256 guaranteedAmountOut = _getGuaranteedAmountOut(
            amountIn,
            order.guaranteedRate,
            order.decimalsIn,
            order.decimalsOut
        );
        // Computing the amount of agToken that must be burnt to get the amountOut guaranteed
        if (guaranteedAmountOut > 0) {
            uint256 amountAgTokenNeeded = TRANSMUTER.quoteOut(guaranteedAmountOut, AGTOKEN, tokenOut);
            // If more agTokens than what has been obtained through the first mint must be burnt to get to the
            // guaranteed amountOut, we're taking it from the subsidy budget set
            if (amountAgToken < amountAgTokenNeeded) {
                subsidy = amountAgTokenNeeded - amountAgToken;

                // In the case where the subsidy budget is too small, we may not be able to provide the guaranteed
                // amountOut to the user
                if (subsidy > order.subsidyBudget) subsidy = order.subsidyBudget;
            }
        }
    }

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                      GOVERNANCE                                                    
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc IRebalancer
    /// @dev Before calling this function, governance must make sure that there are enough `agToken` idle
    /// in the contract to sponsor the swaps
    /// @dev This function can be used to decrease an order by overriding it
    function setOrder(
        address tokenIn,
        address tokenOut,
        uint256 subsidyBudget,
        uint256 guaranteedRate
    ) external onlyGuardian {
        Order storage order = orders[tokenIn][tokenOut];
        uint8 decimalsIn = order.decimalsIn;
        uint8 decimalsOut = order.decimalsOut;
        if (decimalsIn == 0) {
            decimalsIn = TRANSMUTER.getCollateralDecimals(tokenIn);
            order.decimalsIn = decimalsIn;
        }
        if (decimalsOut == 0) {
            decimalsOut = TRANSMUTER.getCollateralDecimals(tokenOut);
            order.decimalsOut = decimalsOut;
        }
        // If a token has 0 decimals on the Transmuter, then it's not an actual collateral of the Transmuter
        if (decimalsIn == 0 || decimalsOut == 0) revert NotCollateral();
        uint256 newBudget = budget + subsidyBudget - order.subsidyBudget;
        if (IERC20(AGTOKEN).balanceOf(address(this)) < newBudget) revert InvalidParam();
        budget = newBudget;
        order.subsidyBudget = subsidyBudget.toUint112();
        order.guaranteedRate = guaranteedRate.toUint128();

        emit OrderSet(tokenIn, tokenOut, subsidyBudget, guaranteedRate);
    }

    /// @inheritdoc IRebalancer
    /// @dev This function checks if too much is not being recovered with respect to currently available budgets
    function recover(address token, uint256 amount, address to) external onlyGuardian {
        if (token == address(AGTOKEN) && IERC20(token).balanceOf(address(this)) < budget + amount)
            revert InvalidParam();
        IERC20(token).safeTransfer(to, amount);
    }

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                        HELPER                                                      
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    function _adjustAllowance(address token, address sender, uint256 amountIn) internal {
        uint256 allowance = IERC20(token).allowance(address(this), sender);
        if (allowance < amountIn) IERC20(token).safeIncreaseAllowance(sender, type(uint256).max - allowance);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (interfaces/IERC3156FlashBorrower.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC3156 FlashBorrower, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
interface IERC3156FlashBorrower {
    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param fee The additional amount of tokens to repay.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "IERC3156FlashBorrower.onFlashLoan"
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC3156FlashLender.sol)

pragma solidity ^0.8.0;

import "./IERC3156FlashBorrower.sol";

/**
 * @dev Interface of the ERC3156 FlashLender, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
interface IERC3156FlashLender {
    /**
     * @dev The amount of currency available to be lended.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(address token) external view returns (uint256);

    /**
     * @dev The fee to be charged for a given loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @return The amount of `token` to be charged for the loan, on top of the returned principal.
     */
    function flashFee(address token, uint256 amount) external view returns (uint256);

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.19;

import { IERC20 } from "oz/token/ERC20/IERC20.sol";
import { IAccessControlManager } from "interfaces/IAccessControlManager.sol";
import { IAgToken } from "interfaces/IAgToken.sol";

/*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                        ENUMS                                                      
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

enum FacetCutAction {
    Add,
    Replace,
    Remove
}

enum ManagerType {
    EXTERNAL
}

enum ActionType {
    Mint,
    Burn,
    Redeem
}

enum TrustedType {
    Updater,
    Seller
}

enum QuoteType {
    MintExactInput,
    MintExactOutput,
    BurnExactInput,
    BurnExactOutput
}

enum OracleReadType {
    CHAINLINK_FEEDS,
    EXTERNAL,
    NO_ORACLE,
    STABLE,
    WSTETH,
    CBETH,
    RETH,
    SFRXETH,
    PYTH,
    MAX,
    MORPHO_ORACLE
}

enum OracleQuoteType {
    UNIT,
    TARGET
}

enum WhitelistType {
    BACKED
}

/*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                    STRUCTS                                                     
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

struct Permit2Details {
    address to; // Address that will receive the funds
    uint256 nonce; // Nonce of the transaction
    bytes signature; // Permit signature of the user
}

struct FacetCut {
    address facetAddress; // Facet contract address
    FacetCutAction action; // Can be add, remove or replace
    bytes4[] functionSelectors; // Ex. bytes4(keccak256("transfer(address,uint256)"))
}

struct Facet {
    address facetAddress; // Facet contract address
    bytes4[] functionSelectors; // Ex. bytes4(keccak256("transfer(address,uint256)"))
}

struct FacetInfo {
    address facetAddress; // Facet contract address
    uint16 selectorPosition; // Position in the list of all selectors
}

struct DiamondStorage {
    bytes4[] selectors; // List of all available selectors
    mapping(bytes4 => FacetInfo) selectorInfo; // Selector to (address, position in list)
    IAccessControlManager accessControlManager; // Contract handling access control
}

struct ImplementationStorage {
    address implementation; // Dummy implementation address for Etherscan usability
}

struct ManagerStorage {
    IERC20[] subCollaterals; // Subtokens handled by the manager or strategies
    bytes config; // Additional configuration data
}

struct Collateral {
    uint8 isManaged; // If the collateral is managed through external strategies
    uint8 isMintLive; // If minting from this asset is unpaused
    uint8 isBurnLive; // If burning to this asset is unpaused
    uint8 decimals; // IERC20Metadata(collateral).decimals()
    uint8 onlyWhitelisted; // If only whitelisted addresses can burn or redeem for this token
    uint216 normalizedStables; // Normalized amount of stablecoins issued from this collateral
    uint64[] xFeeMint; // Increasing exposures in [0,BASE_9[
    int64[] yFeeMint; // Mint fees at the exposures specified in `xFeeMint`
    uint64[] xFeeBurn; // Decreasing exposures in ]0,BASE_9]
    int64[] yFeeBurn; // Burn fees at the exposures specified in `xFeeBurn`
    bytes oracleConfig; // Data about the oracle used for the collateral
    bytes whitelistData; // For whitelisted collateral, data used to verify whitelists
    ManagerStorage managerData; // For managed collateral, data used to handle the strategies
}

struct TransmuterStorage {
    IAgToken agToken; // agToken handled by the system
    uint8 isRedemptionLive; // If redemption is unpaused
    uint8 statusReentrant; // If call is reentrant or not
    uint128 normalizedStables; // Normalized amount of stablecoins issued by the system
    uint128 normalizer; // To reconcile `normalizedStables` values with the actual amount
    address[] collateralList; // List of collateral assets supported by the system
    uint64[] xRedemptionCurve; // Increasing collateral ratios > 0
    int64[] yRedemptionCurve; // Value of the redemption fees at `xRedemptionCurve`
    mapping(address => Collateral) collaterals; // Maps a collateral asset to its parameters
    mapping(address => uint256) isTrusted; // If an address is trusted to update the normalizer value
    mapping(address => uint256) isSellerTrusted; // If an address is trusted to sell accruing reward tokens or to run keeper jobs on oracles
    mapping(WhitelistType => mapping(address => uint256)) isWhitelistedForType;
    // Whether an address is whitelisted for a specific whitelist type
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

import { IERC20 } from "oz/token/ERC20/IERC20.sol";

/// @title IAgToken
/// @author Angle Labs, Inc.
/// @notice Interface for the stablecoins `AgToken` contracts
interface IAgToken is IERC20 {
    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                              MINTER ROLE ONLY FUNCTIONS                                            
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Lets a whitelisted contract mint agTokens
    /// @param account Address to mint to
    /// @param amount Amount to mint
    function mint(address account, uint256 amount) external;

    /// @notice Burns `amount` tokens from a `burner` address after being asked to by `sender`
    /// @param amount Amount of tokens to burn
    /// @param burner Address to burn from
    /// @param sender Address which requested the burn from `burner`
    /// @dev This method is to be called by a contract with the minter right after being requested
    /// to do so by a `sender` address willing to burn tokens from another `burner` address
    /// @dev The method checks the allowance between the `sender` and the `burner`
    function burnFrom(uint256 amount, address burner, address sender) external;

    /// @notice Burns `amount` tokens from a `burner` address
    /// @param amount Amount of tokens to burn
    /// @param burner Address to burn from
    /// @dev This method is to be called by a contract with a minter right on the AgToken after being
    /// requested to do so by an address willing to burn tokens from its address
    function burnSelf(uint256 amount, address burner) external;

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                TREASURY ONLY FUNCTIONS                                             
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Adds a minter in the contract
    /// @param minter Minter address to add
    /// @dev Zero address checks are performed directly in the `Treasury` contract
    function addMinter(address minter) external;

    /// @notice Removes a minter from the contract
    /// @param minter Minter address to remove
    /// @dev This function can also be called by a minter wishing to revoke itself
    function removeMinter(address minter) external;

    /// @notice Sets a new treasury contract
    /// @param _treasury New treasury address
    function setTreasury(address _treasury) external;

    /*//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                                                  EXTERNAL FUNCTIONS                                                
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/

    /// @notice Checks whether an address has the right to mint agTokens
    /// @param minter Address for which the minting right should be checked
    /// @return Whether the address has the right to mint agTokens or not
    function isMinter(address minter) external view returns (bool);

    /// @notice Amount of decimals of the stablecoin
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.0;

struct Order {
    // Total agToken budget allocated to subsidize the swaps between the tokens associated to the order
    uint112 subsidyBudget;
    // Decimals of the `tokenIn` associated to the order
    uint8 decimalsIn;
    // Decimals of the `tokenOut` associated to the order
    uint8 decimalsOut;
    // Guaranteed exchange rate in `BASE_18` for the swaps between the `tokenIn` and `tokenOut` associated to
    // the order. This rate is a minimum rate guaranteed up to when the `subsidyBudget` is fully consumed
    uint128 guaranteedRate;
}

/// @title IRebalancer
/// @author Angle Labs, Inc.
interface IRebalancer {
    /// @notice Swaps `tokenIn` for `tokenOut` through an intermediary agToken mint from `tokenIn` and
    /// burn to `tokenOut`. Eventually, this transaction may be sponsored and yield an amount of `tokenOut`
    /// higher than what would be obtained through a mint and burn directly on the `transmuter`
    /// @param amountIn Amount of `tokenIn` to bring for the rebalancing
    /// @param amountOutMin Minimum amount of `tokenOut` that must be obtained from the swap
    /// @param to Address to which `tokenOut` must be sent
    /// @param deadline Timestamp before which this transaction must be included
    /// @return amountOut Amount of outToken obtained
    function swapExactInput(
        uint256 amountIn,
        uint256 amountOutMin,
        address tokenIn,
        address tokenOut,
        address to,
        uint256 deadline
    ) external returns (uint256 amountOut);

    /// @notice Approximates how much a call to `swapExactInput` with the same parameters would yield in terms
    /// of `amountOut`
    function quoteIn(uint256 amountIn, address tokenIn, address tokenOut) external view returns (uint256 amountOut);

    /// @notice Helper to compute the minimum guaranteed amount out that would be obtained from a swap of `amountIn`
    /// of `tokenIn` to `tokenOut`
    function getGuaranteedAmountOut(
        address tokenIn,
        address tokenOut,
        uint256 amountIn
    ) external view returns (uint256);

    /// @notice Lets governance set an order to subsidize rebalances between `tokenIn` and `tokenOut`
    function setOrder(address tokenIn, address tokenOut, uint256 subsidyBudget, uint256 guaranteedRate) external;

    /// @notice Recovers `amount` of `token` to the `to` address
    /// @dev This function checks if too much is not being recovered with respect to currently available budgets
    function recover(address token, uint256 amount, address to) external;
}

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  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "metadata": {
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    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
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  "evmVersion": "paris",
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  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000022604c0e5633a9810e01c9cb469b23eee17ac411000000000000000000000000beef01735c132ada46aa9aa4c54623caa92a64cb0000000000000000000000000000000000000000000000000000000007bfa4800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000989680

-----Decoded View---------------
Arg [0] : _rebalancer (address): 0x22604C0E5633A9810E01c9cb469B23Eee17AC411
Arg [1] : vault (address): 0xBEEF01735c132Ada46AA9aA4c54623cAA92A64CB
Arg [2] : targetExposure (uint64): 130000000
Arg [3] : overrideExposures (uint64): 0
Arg [4] : maxExposureYieldAsset (uint64): 0
Arg [5] : minExposureYieldAsset (uint64): 0
Arg [6] : _maxSlippage (uint96): 10000000

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 00000000000000000000000022604c0e5633a9810e01c9cb469b23eee17ac411
Arg [1] : 000000000000000000000000beef01735c132ada46aa9aa4c54623caa92a64cb
Arg [2] : 0000000000000000000000000000000000000000000000000000000007bfa480
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000989680