// SPDX-License-Identifier: Apache-2.0
// Copyright 2022 Aztec
pragma solidity >=0.8.4;

// Copyright 2022 Aztec

library AztecTypes {
    enum AztecAssetType {
        NOT_USED,
        ETH,
        ERC20,
        VIRTUAL
    }

    struct AztecAsset {
        uint256 id;
        address erc20Address;
        AztecAssetType assetType;
    }
}

// Copyright 2022 Aztec

// @dev For documentation of the functions within this interface see RollupProcessor contract
interface IRollupProcessor {
    /*----------------------------------------
    EVENTS
    ----------------------------------------*/
    event OffchainData(uint256 indexed rollupId, uint256 chunk, uint256 totalChunks, address sender);
    event RollupProcessed(uint256 indexed rollupId, bytes32[] nextExpectedDefiHashes, address sender);
    event DefiBridgeProcessed(
        uint256 indexed encodedBridgeCallData,
        uint256 indexed nonce,
        uint256 totalInputValue,
        uint256 totalOutputValueA,
        uint256 totalOutputValueB,
        bool result,
        bytes errorReason
    );
    event AsyncDefiBridgeProcessed(
        uint256 indexed encodedBridgeCallData,
        uint256 indexed nonce,
        uint256 totalInputValue
    );
    event Deposit(uint256 indexed assetId, address indexed depositorAddress, uint256 depositValue);
    event WithdrawError(bytes errorReason);
    event AssetAdded(uint256 indexed assetId, address indexed assetAddress, uint256 assetGasLimit);
    event BridgeAdded(uint256 indexed bridgeAddressId, address indexed bridgeAddress, uint256 bridgeGasLimit);
    event RollupProviderUpdated(address indexed providerAddress, bool valid);
    event VerifierUpdated(address indexed verifierAddress);
    event Paused(address account);
    event Unpaused(address account);

    /*----------------------------------------
      MUTATING FUNCTIONS
      ----------------------------------------*/

    function pause() external;

    function unpause() external;

    function setRollupProvider(address _provider, bool _valid) external;

    function setVerifier(address _verifier) external;

    function setAllowThirdPartyContracts(bool _allowThirdPartyContracts) external;

    function setDefiBridgeProxy(address _defiBridgeProxy) external;

    function setSupportedAsset(address _token, uint256 _gasLimit) external;

    function setSupportedBridge(address _bridge, uint256 _gasLimit) external;

    function processRollup(bytes calldata _encodedProofData, bytes calldata _signatures) external;

    function receiveEthFromBridge(uint256 _interactionNonce) external payable;

    function approveProof(bytes32 _proofHash) external;

    function depositPendingFunds(
        uint256 _assetId,
        uint256 _amount,
        address _owner,
        bytes32 _proofHash
    ) external payable;

    function offchainData(
        uint256 _rollupId,
        uint256 _chunk,
        uint256 _totalChunks,
        bytes calldata _offchainTxData
    ) external;

    function processAsyncDefiInteraction(uint256 _interactionNonce) external returns (bool);

    /*----------------------------------------
      NON-MUTATING FUNCTIONS
      ----------------------------------------*/

    function rollupStateHash() external view returns (bytes32);

    function userPendingDeposits(uint256 _assetId, address _user) external view returns (uint256);

    function defiBridgeProxy() external view returns (address);

    function prevDefiInteractionsHash() external view returns (bytes32);

    function paused() external view returns (bool);

    function verifier() external view returns (address);

    function getDataSize() external view returns (uint256);

    function getPendingDefiInteractionHashesLength() external view returns (uint256);

    function getDefiInteractionHashesLength() external view returns (uint256);

    function getAsyncDefiInteractionHashesLength() external view returns (uint256);

    function getSupportedBridge(uint256 _bridgeAddressId) external view returns (address);

    function getSupportedBridgesLength() external view returns (uint256);

    function getSupportedAssetsLength() external view returns (uint256);

    function getSupportedAsset(uint256 _assetId) external view returns (address);

    function getEscapeHatchStatus() external view returns (bool, uint256);
}

interface IYearnRegistry {
    function latestVault(address token) external view returns (address);

    function tokens(uint256 index) external view returns (address);

    function vaults(address token, uint256 index) external view returns (address);

    function numTokens() external view returns (uint256);

    function numVaults(address token) external view returns (uint256);
}

interface IYearnVault {
    function deposit(uint256 amount) external returns (uint256);

    function withdraw(uint256 maxShares) external returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function token() external view returns (address);

    function decimals() external view returns (uint256);

    function availableDepositLimit() external view returns (uint256);

    function pricePerShare() external view returns (uint256);

    function totalAssets() external view returns (uint256);
}

// Copyright 2022 Aztec.

// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

/**
 * @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);
}

interface IWETH is IERC20 {
    function deposit() external payable;

    function withdraw(uint256 amount) external;
}

// Copyright 2022 Aztec.

library ErrorLib {
    error InvalidCaller();

    error InvalidInput();
    error InvalidInputA();
    error InvalidInputB();
    error InvalidOutputA();
    error InvalidOutputB();
    error InvalidInputAmount();
    error InvalidAuxData();

    error ApproveFailed(address token);
    error TransferFailed(address token);

    error InvalidNonce();
    error AsyncDisabled();
}

// Copyright 2022 Aztec.

// Copyright 2022 Aztec

interface IDefiBridge {
    /**
     * @notice A function which converts input assets to output assets.
     * @param _inputAssetA A struct detailing the first input asset
     * @param _inputAssetB A struct detailing the second input asset
     * @param _outputAssetA A struct detailing the first output asset
     * @param _outputAssetB A struct detailing the second output asset
     * @param _totalInputValue An amount of input assets transferred to the bridge (Note: "total" is in the name
     *                         because the value can represent summed/aggregated token amounts of users actions on L2)
     * @param _interactionNonce A globally unique identifier of this interaction/`convert(...)` call.
     * @param _auxData Bridge specific data to be passed into the bridge contract (e.g. slippage, nftID etc.)
     * @return outputValueA An amount of `_outputAssetA` returned from this interaction.
     * @return outputValueB An amount of `_outputAssetB` returned from this interaction.
     * @return isAsync A flag indicating if the interaction is async.
     * @dev This function is called from the RollupProcessor contract via the DefiBridgeProxy. Before this function is
     *      called _RollupProcessor_ contract will have sent you all the assets defined by the input params. This
     *      function is expected to convert input assets to output assets (e.g. on Uniswap) and return the amounts
     *      of output assets to be received by the _RollupProcessor_. If output assets are ERC20 tokens the bridge has
     *      to _RollupProcessor_ as a spender before the interaction is finished. If some of the output assets is ETH
     *      it has to be sent to _RollupProcessor_ via the `receiveEthFromBridge(uint256 _interactionNonce)` method
     *      inside before the `convert(...)` function call finishes.
     * @dev If there are two input assets, equal amounts of both assets will be transferred to the bridge before this
     *      method is called.
     * @dev **BOTH** output assets could be virtual but since their `assetId` is currently assigned as
     *      `_interactionNonce` it would simply mean that more of the same virtual asset is minted.
     * @dev If this interaction is async the function has to return `(0,0 true)`. Async interaction will be finalised at
     *      a later time and its output assets will be returned in a `IDefiBridge.finalise(...)` call.
     **/
    function convert(
        AztecTypes.AztecAsset calldata _inputAssetA,
        AztecTypes.AztecAsset calldata _inputAssetB,
        AztecTypes.AztecAsset calldata _outputAssetA,
        AztecTypes.AztecAsset calldata _outputAssetB,
        uint256 _totalInputValue,
        uint256 _interactionNonce,
        uint64 _auxData,
        address _rollupBeneficiary
    )
        external
        payable
        returns (
            uint256 outputValueA,
            uint256 outputValueB,
            bool isAsync
        );

    /**
     * @notice A function that finalises asynchronous interaction.
     * @param _inputAssetA A struct detailing the first input asset
     * @param _inputAssetB A struct detailing the second input asset
     * @param _outputAssetA A struct detailing the first output asset
     * @param _outputAssetB A struct detailing the second output asset
     * @param _interactionNonce A globally unique identifier of this interaction/`convert(...)` call.
     * @param _auxData Bridge specific data to be passed into the bridge contract (e.g. slippage, nftID etc.)
     * @return outputValueA An amount of `_outputAssetA` returned from this interaction.
     * @return outputValueB An amount of `_outputAssetB` returned from this interaction.
     * @dev This function should use the `BridgeBase.onlyRollup()` modifier to ensure it can only be called from
     *      the `RollupProcessor.processAsyncDefiInteraction(uint256 _interactionNonce)` method.
     **/
    function finalise(
        AztecTypes.AztecAsset calldata _inputAssetA,
        AztecTypes.AztecAsset calldata _inputAssetB,
        AztecTypes.AztecAsset calldata _outputAssetA,
        AztecTypes.AztecAsset calldata _outputAssetB,
        uint256 _interactionNonce,
        uint64 _auxData
    )
        external
        payable
        returns (
            uint256 outputValueA,
            uint256 outputValueB,
            bool interactionComplete
        );
}

// Copyright 2022 Aztec

// @dev documentation of this interface is in its implementation (Subsidy contract)
interface ISubsidy {
    /**
     * @notice Container for Subsidy related information
     * @member available Amount of ETH remaining to be paid out
     * @member gasUsage Amount of gas the interaction consumes (used to define max possible payout)
     * @member minGasPerMinute Minimum amount of gas per minute the subsidizer has to subsidize
     * @member gasPerMinute Amount of gas per minute the subsidizer is willing to subsidize
     * @member lastUpdated Last time subsidy was paid out or funded (if not subsidy was yet claimed after funding)
     */
    struct Subsidy {
        uint128 available;
        uint32 gasUsage;
        uint32 minGasPerMinute;
        uint32 gasPerMinute;
        uint32 lastUpdated;
    }

    function setGasUsageAndMinGasPerMinute(
        uint256 _criteria,
        uint32 _gasUsage,
        uint32 _minGasPerMinute
    ) external;

    function setGasUsageAndMinGasPerMinute(
        uint256[] calldata _criteria,
        uint32[] calldata _gasUsage,
        uint32[] calldata _minGasPerMinute
    ) external;

    function registerBeneficiary(address _beneficiary) external;

    function subsidize(
        address _bridge,
        uint256 _criteria,
        uint32 _gasPerMinute
    ) external payable;

    function topUp(address _bridge, uint256 _criteria) external payable;

    function claimSubsidy(uint256 _criteria, address _beneficiary) external returns (uint256);

    function withdraw(address _beneficiary) external returns (uint256);

    // solhint-disable-next-line
    function MIN_SUBSIDY_VALUE() external view returns (uint256);

    function claimableAmount(address _beneficiary) external view returns (uint256);

    function isRegistered(address _beneficiary) external view returns (bool);

    function getSubsidy(address _bridge, uint256 _criteria) external view returns (Subsidy memory);

    function getAccumulatedSubsidyAmount(address _bridge, uint256 _criteria) external view returns (uint256);
}

/**
 * @title BridgeBase
 * @notice A base that bridges can be built upon which imports a limited set of features
 * @dev Reverts `convert` with missing implementation, and `finalise` with async disabled
 * @author Lasse Herskind
 */
abstract contract BridgeBase is IDefiBridge {
    error MissingImplementation();

    ISubsidy public constant SUBSIDY = ISubsidy(0xABc30E831B5Cc173A9Ed5941714A7845c909e7fA);
    address public immutable ROLLUP_PROCESSOR;

    constructor(address _rollupProcessor) {
        ROLLUP_PROCESSOR = _rollupProcessor;
    }

    modifier onlyRollup() {
        if (msg.sender != ROLLUP_PROCESSOR) {
            revert ErrorLib.InvalidCaller();
        }
        _;
    }

    function convert(
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        uint256,
        uint256,
        uint64,
        address
    )
        external
        payable
        virtual
        override(IDefiBridge)
        returns (
            uint256,
            uint256,
            bool
        )
    {
        revert MissingImplementation();
    }

    function finalise(
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        uint256,
        uint64
    )
        external
        payable
        virtual
        override(IDefiBridge)
        returns (
            uint256,
            uint256,
            bool
        )
    {
        revert ErrorLib.AsyncDisabled();
    }

    /**
     * @notice Computes the criteria that is passed on to the subsidy contract when claiming
     * @dev Should be overridden by bridge implementation if intended to limit subsidy.
     * @return The criteria to be passed along
     */
    function computeCriteria(
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        uint64
    ) public view virtual returns (uint256) {
        return 0;
    }
}

// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

/**
 * @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);
}

// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

/**
 * @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);
            }
        }
    }
}

/**
 * @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");
        }
    }
}

/**
 * @title Aztec Connect Bridge for depositing on Yearn
 * @author Majorfi
 * @notice You can use this contract to deposit tokens on compatible Yearn Vaults
 */
contract YearnBridge is BridgeBase {
    using SafeERC20 for IERC20;

    IYearnRegistry public constant YEARN_REGISTRY = IYearnRegistry(0x50c1a2eA0a861A967D9d0FFE2AE4012c2E053804);
    address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    error InvalidOutputANotLatest();
    error InvalidWETHAmount();
    error InvalidOutputVault();
    error InvalidVault();

    /**
     * @notice Sets address of rollup processor and Subsidy-related info
     * @param _rollupProcessor Address of rollup processor
     */
    constructor(address _rollupProcessor) BridgeBase(_rollupProcessor) {
        uint256[] memory criteria = new uint256[](2);
        uint32[] memory gasUsage = new uint32[](2);
        uint32[] memory minGasPerMinute = new uint32[](2);

        criteria[0] = 0;
        criteria[1] = 1;

        gasUsage[0] = 200000;
        gasUsage[1] = 200000;

        minGasPerMinute[0] = 140;
        minGasPerMinute[1] = 140;

        SUBSIDY.setGasUsageAndMinGasPerMinute(criteria, gasUsage, minGasPerMinute);
    }

    receive() external payable {}

    /**
     * @notice Set all the necessary approvals for all the latest vaults for the tokens supported by Yearn
     */
    function preApproveAll() external {
        uint256 numTokens = YEARN_REGISTRY.numTokens();
        for (uint256 i; i < numTokens; ) {
            address token = YEARN_REGISTRY.tokens(i);
            address vault = YEARN_REGISTRY.latestVault(token);
            _preApprove(vault, token);

            unchecked {
                ++i;
            }
        }
    }

    /**
     * @notice Set all the necessary approvals for a given vault and its underlying.
     * @dev The vault must be a valid Yearn vault, registered in the registry
     * @param _vault - vault address
     */
    function preApprove(address _vault) external {
        address token = IYearnVault(_vault).token();
        uint256 numVaultsForToken = YEARN_REGISTRY.numVaults(token);
        for (uint256 i; i < numVaultsForToken; ) {
            address vault = YEARN_REGISTRY.vaults(token, i);
            if (vault == _vault) {
                _preApprove(vault, token);
                return;
            }
            unchecked {
                ++i;
            }
        }
        revert InvalidVault();
    }

    /**
     * @notice A function which will allow the user to deposit/withdraw a given amount of a given token to a given vault. When depositing to a Yearn vault,
     * the user deposits the underlying token as input (ex: DAI). When withdrawing, the number of shares to be withdrawn from the Yearn Vault are specified,
     * where the input is the yvToken (ex: yvDAI) and the output is the underlying token (ex: DAI).
     * @param _inputAssetA - ERC20 token to deposit or Yearn Vault ERC20 token to withdraw
     * @param _outputAssetA - Yearn Vault ERC20 token to receive on deposit or ERC20 token to receive on withdraw
     * @param _inputValue - Amount to deposit or withdraw
     * @param _interactionNonce - Unique identifier for this DeFi interaction
     * @param _auxData - Special value to indicate a deposit (0) or a withdraw (1) (used as Subsidy criteria)
     * @param _rollupBeneficiary - Address which receives subsidy if the call is eligible for it
     * @return outputValueA - the amount of output asset to return
     */
    function convert(
        AztecTypes.AztecAsset memory _inputAssetA,
        AztecTypes.AztecAsset memory,
        AztecTypes.AztecAsset memory _outputAssetA,
        AztecTypes.AztecAsset memory,
        uint256 _inputValue,
        uint256 _interactionNonce,
        uint64 _auxData,
        address _rollupBeneficiary
    )
        external
        payable
        override(BridgeBase)
        onlyRollup
        returns (
            uint256 outputValueA,
            uint256,
            bool
        )
    {
        if (_auxData == 0) {
            if (_outputAssetA.assetType != AztecTypes.AztecAssetType.ERC20) {
                revert ErrorLib.InvalidOutputA();
            }
            if (_inputAssetA.assetType == AztecTypes.AztecAssetType.ETH) {
                _zapETH(msg.value, _outputAssetA);
            }
            outputValueA = IYearnVault(_outputAssetA.erc20Address).deposit(_inputValue);
        } else if (_auxData == 1) {
            if (_inputAssetA.assetType != AztecTypes.AztecAssetType.ERC20) {
                revert ErrorLib.InvalidInputA();
            }

            if (_outputAssetA.assetType == AztecTypes.AztecAssetType.ETH) {
                outputValueA = _unzapETH(_inputValue, _interactionNonce, _inputAssetA);
            } else if (_outputAssetA.assetType == AztecTypes.AztecAssetType.ERC20) {
                outputValueA = IYearnVault(_inputAssetA.erc20Address).withdraw(_inputValue);
            } else {
                revert ErrorLib.InvalidOutputA();
            }
        } else {
            revert ErrorLib.InvalidAuxData();
        }

        // Accumulate subsidy to _rollupBeneficiary
        SUBSIDY.claimSubsidy(_auxData, _rollupBeneficiary);

        return (outputValueA, 0, false);
    }

    /**
     * @notice zap _inputValue ETH to wETH.
     * @param _inputValue - Amount of underlying to deposit
     * @param _outputAssetA - Vault we want to deposit to
     */
    function _zapETH(uint256 _inputValue, AztecTypes.AztecAsset memory _outputAssetA) private {
        IYearnVault yVault = IYearnVault(_outputAssetA.erc20Address);
        address underlyingToken = yVault.token();
        if (underlyingToken != WETH) {
            revert ErrorLib.InvalidOutputA();
        }
        IWETH(WETH).deposit{value: _inputValue}();
    }

    /**
     * @notice Withdraw _inputValue from a yvETH vault, unwrap the wETH received to ETH and reclaim them.
     * @param _inputValue - Amount of shares to withdraw
     * @param _interactionNonce - Aztec nonce of the interaction
     */
    function _unzapETH(
        uint256 _inputValue,
        uint256 _interactionNonce,
        AztecTypes.AztecAsset memory _inputAssetA
    ) private returns (uint256 outputValue) {
        IYearnVault yVault = IYearnVault(_inputAssetA.erc20Address);
        if (yVault.token() != WETH) {
            revert ErrorLib.InvalidInputA();
        }

        uint256 wethAmount = yVault.withdraw(_inputValue);
        if (wethAmount == 0) {
            revert InvalidWETHAmount();
        }

        uint256 outputValueBefore = address(this).balance;
        IWETH(WETH).withdraw(wethAmount);
        outputValue = address(this).balance;
        IRollupProcessor(ROLLUP_PROCESSOR).receiveEthFromBridge{value: outputValue - outputValueBefore}(
            _interactionNonce
        );
    }

    /**
     * @notice Computes the criteria that is passed when claiming subsidy.
     * @param _auxData Special value to indicate a deposit (0) or a withdraw (1)
     * @return The criteria
     */
    function computeCriteria(
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        AztecTypes.AztecAsset calldata,
        uint64 _auxData
    ) public pure override(BridgeBase) returns (uint256) {
        if (_auxData > 1) {
            revert ErrorLib.InvalidAuxData();
        }
        return _auxData;
    }

    /**
     * @notice Perform all the necessary approvals for a given vault and its underlying.
     * @param _vault - vault we are working with
     * @param _token - address of the token to approve
     */
    function _preApprove(address _vault, address _token) private {
        // Using safeApprove(...) instead of approve(...) here because underlying can be Tether;
        uint256 allowance = IERC20(_token).allowance(address(this), _vault);
        if (allowance != type(uint256).max) {
            // Resetting allowance to 0 in order to avoid issues with USDT
            IERC20(_token).safeApprove(_vault, 0);
            IERC20(_token).safeApprove(_vault, type(uint256).max);
        }

        allowance = IERC20(_token).allowance(address(this), ROLLUP_PROCESSOR);
        if (allowance != type(uint256).max) {
            // Resetting allowance to 0 in order to avoid issues with USDT
            IERC20(_token).safeApprove(ROLLUP_PROCESSOR, 0);
            IERC20(_token).safeApprove(ROLLUP_PROCESSOR, type(uint256).max);
        }

        IERC20(_vault).approve(ROLLUP_PROCESSOR, type(uint256).max);
    }
}