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

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "./libraries/CallParams.sol";

/// @title A multicall contract that can be called only by the solver.
/// Allows Solver to approve max approvals to it and safely execute multiple transactions at once
contract SolverMulticallV1 {
    using SafeERC20 for IERC20;
    using CallParams for CallParams.Params;

    struct Call {
        CallParams.Params params;   // encoded params
        address target;             // `call.to` - address of smart contract that should be called
        uint256 msgValue;           // `msg.value` that should be attached to the call
        bytes data;                 // `call.data` that should be passed to the call
    }

    struct BalanceCheck {
        address token;             // ERC20 token address or address(0) for native token
        address receiver;          // Tokens receiver
        uint256 minAmount;         // Minimum amount to receive
    }

    address public immutable solver;
    address public immutable factory;

    error BelowAmountOutMin(uint256 balanceIndex, uint256 received);
    error CallFailed(uint256 index, bytes errorData);
    error NotASolver();

    /// @notice Only immutable solver can call the functions.
    modifier onlySolver() {
        if (msg.sender != solver) revert NotASolver();
        _;
    }

    /**
     * @param _solver Multicall owner address
     * @param _factory Factory contract address
     */
    constructor(
        address _solver,
        address _factory
    ) {
        solver = _solver;
        factory = _factory;
    }

    receive() external payable {}

    /**
     * @notice Executes multiple calls
     * @param calls Encoded array of calls that must be executed
     * @param balanceChecks Encoded of balance changes that should be checked.
     * Should not contain duplicate token-receiver pairs
     */
    function multicall(
        Call[] memory calls,
        BalanceCheck[] calldata balanceChecks
    ) external payable onlySolver {
        uint256[] memory initialBalances = new uint256[](balanceChecks.length);
        for (uint256 balanceIndex = 0; balanceIndex < balanceChecks.length; balanceIndex++) {
            initialBalances[balanceIndex] = _getBalance(
                balanceChecks[balanceIndex].token,
                balanceChecks[balanceIndex].receiver
            );
        }

        for (uint256 i = 0; i < calls.length; i++) {
            Call memory call = calls[i];

            // special params case - no call is required
            if (call.params.checkSlippage()) {
                for (uint256 balanceIndex = 0; balanceIndex < balanceChecks.length; balanceIndex++) {
                    uint256 received = _getBalance(
                        balanceChecks[balanceIndex].token,
                        balanceChecks[balanceIndex].receiver
                    ) - initialBalances[balanceIndex];
                    if (received < balanceChecks[balanceIndex].minAmount) {
                        revert BelowAmountOutMin(balanceIndex, received);
                    }
                }
                continue;
            }

            call.params.updateCallData(call.data, call.msgValue);

            if (call.params.shouldApproveIfRequired()) {
                _safeApproveIfRequired(
                    call.params.getToken(),
                    call.target,
                    call.params.getAmountIn(call.data)
                );
            }

            if (call.params.shouldSkipCall()) continue;

            if (call.params.shouldPassFullNativeBalance()) {
                call.msgValue = address(this).balance;
            }

            (bool success, bytes memory data) = call.target.call{value: call.msgValue}(call.data);
            if (!success) revert CallFailed(i, data);
        }
    }

    /**
     * @notice Approves ERC20 token to `spender` in case of insufficient allowance
     * @param token ERC20 token that needs to be approved
     * @param spender Spender address
     * @param amountToSpend Amount of tokens to spend
     */
    function _safeApproveIfRequired(
        IERC20 token,
        address spender,
        uint256 amountToSpend
    ) internal {
        uint256 allowance = token.allowance(address(this), spender);
        if (allowance < amountToSpend) {
            // Approves to 0 in case token processes `approve` like `increaseAllowance`
            if (allowance != 0) {
                token.forceApprove(spender, 0);
            }
            token.forceApprove(spender, type(uint256).max);
        }
    }

    /**
     * @notice Returns balance of token OUT
     * @param token ERC20 token address (address(0) if native token)
     * @param account Account, which balance should be checked
     */
    function _getBalance(
        address token,
        address account
    ) internal view returns (uint256) {
        if (token == address(0)) {
            return account.balance;
        } else {
            return IERC20(token).balanceOf(account);
        }
    }
}

/// @title A factory contract that allows easily deploying your own SolverMulticallV1
contract SolverMulticallV1Factory {
    // Mapping for easy search of already deployed Multicall contracts
    mapping(address owner => address) public multicallAddress;

    error AlreadyDeployed(address);

    event MulticallDeployed(address owner, address multicall);

    /// @notice Deploys new multicall contract instance. Only one can be deployed by the Solver
    function deploySolverMulticall() external returns (address deployedAddress) {
        if (multicallAddress[msg.sender] != address(0)) {
            revert AlreadyDeployed(multicallAddress[msg.sender]);
        }

        SolverMulticallV1 multicall = new SolverMulticallV1{salt: bytes32(uint256(uint160(msg.sender)))}(
            msg.sender,
            address(this)
        );

        deployedAddress = address(multicall);
        multicallAddress[msg.sender] = deployedAddress;

        emit MulticallDeployed(msg.sender, deployedAddress);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

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

pragma solidity ^0.8.20;

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

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

pragma solidity ^0.8.20;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

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

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

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";
import {Address} from "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Address.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert Errors.InsufficientBalance(address(this).balance, amount);
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert Errors.FailedCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {Errors.FailedCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert Errors.InsufficientBalance(address(this).balance, value);
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {Errors.FailedCall}) in case
     * of an unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {Errors.FailedCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {Errors.FailedCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // 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
            assembly ("memory-safe") {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert Errors.FailedCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Errors.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of common custom errors used in multiple contracts
 *
 * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
 * It is recommended to avoid relying on the error API for critical functionality.
 *
 * _Available since v5.1._
 */
library Errors {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error InsufficientBalance(uint256 balance, uint256 needed);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedCall();

    /**
     * @dev The deployment failed.
     */
    error FailedDeployment();

    /**
     * @dev A necessary precompile is missing.
     */
    error MissingPrecompile(address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

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

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

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @title Library for decoding call params, tightly encoded into bytes32 and updating calldata
/// Main purpose - decrease amount of calldata passed to Multicall contract
library CallParams {
/*
    Encoded call params (256 bits total)
    (160 bits) - token address that should be approved/checked `balanceOf(address(this))`
    (8 bits) - uint8 index of calldata word which should be replaced with `balanceOf(address(this))`
    (8 bits) - uint8 index of calldata word which should be replaced with native balance of smart contract
    (8 bits) - uint8 index of calldata word which should adjusted proportionally to `balanceOf(address(this))`
                Example usage: adjust `amountOutMin` proportionally to difference between `balanceOf` and `amountIn`
    (8 bits) - uint8 index of calldata word which should adjusted proportionally to native balance
                Example usage: adjust `amountOutMin` proportionally to difference between address(this).balance and `amountIn`
    (8 bits) - uint8 index of calldata word which should be considered as amountIn for approval or proportional amount increase
    ...
    empty bits
    ...
    (1 bit) - boolean, true = should scip actual call
    (1 bit) - boolean, true = should approve tokens if required
    (1 bit) - boolean, true = should update calldata value proportionally to `balanceOf(address(this))` difference
    (1 bit) - boolean, true = should replace calldata value with `balanceOf(address(this))`
    (1 bit) - boolean, true = should update calldata value proportionally to native balance difference
    (1 bit) - boolean, true = should pass full native balance
*/
    type Params is bytes32;

    // bits shift right values
    uint256 private constant PASS_FULL_NATIVE_BALANCE_SHR = 0;
    uint256 private constant REPLACE_NATIVE_BALANCE_SHR = 1;
    uint256 private constant PROPORTIONALLY_UPDATE_NATIVE_BALANCE_SHR = 2;
    uint256 private constant REPLACE_BALANCE_OF_SHR = 3;
    uint256 private constant PROPORTIONALLY_UPDATE_BALANCE_OF_SHR = 4;
    uint256 private constant APPROVE_SHR = 5;
    uint256 private constant SKIP_CALL_SHR = 6;
    uint256 private constant SKIP_CALL_IF_ZERO_TOKENS_SHR = 7;
    uint256 private constant SKIP_CALL_IF_ZERO_NATIVE_SHR = 8;

    uint256 private constant TOKEN_ADDRESS_SHR = 256 - 160;
    uint256 private constant BALANCE_OF_REPLACE_INDEX_SHR = 256 - 160 - 8;
    uint256 private constant NATIVE_BALANCE_REPLACE_INDEX_SHR = 256 - 160 - 8 * 2;
    uint256 private constant UPDATE_PROPORTIONALLY_TO_BALANCE_OF_INDEX_SHR = 256 - 160 - 8 * 3;
    uint256 private constant UPDATE_PROPORTIONALLY_TO_NATIVE_BALANCE_INDEX_SHR = 256 - 160 - 8 * 4;
    uint256 private constant AMOUNT_IN_INDEX_SHR = 256 - 160 - 8 * 5;

    // Special params
    bytes32 private constant SLIPPAGE_CHECK = 0xF000000000000000000000000000000000000000000000000000000000000000;

    error InvalidIndex(uint32 startIndex, uint32 calldataLength);

    /**
     * @notice Returns ERC20 token decoded from params that we want to use for
     * - approval in case of `shouldApproveIfRequired`
     * - value replacement in case of `shouldReplaceBalanceOf`
     * - value update in case of `shouldUpdateProportionallyToBalanceOf`
     * @param params Call params
     */
    function getToken(Params params) internal pure returns (IERC20 token) {
        assembly {
            token := and(
                shr(TOKEN_ADDRESS_SHR, params),
                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
            )
        }
    }

    // --------------------------      SPECIAL PARAMS      --------------------------

    /**
     * @notice Returns true slippage check is required
     * @param params Call params
     * @dev This means no external call will be required. The only thing to do now is check slippage
     */
    function checkSlippage(Params params) internal pure returns (bool) {
        return Params.unwrap(params) == SLIPPAGE_CHECK;
    }

    // --------------------------      CALLDATA FUNCTIONS      --------------------------

    /**
     * @notice Updates calldata according to requirements
     * @param params Call params
     * @param callData Calldata
     */
    function updateCallData(
        Params params,
        bytes memory callData,
        uint256 initialMsgValue
    ) internal view {
        if (shouldReplaceBalanceOf(params)) {
            // usually for updating `amountIn`
            uint256 balance = getToken(params).balanceOf(address(this));
            uint8 indexToReplace = getIndexToReplaceWithBalanceOf(params);

            if (shouldUpdateProportionallyToBalanceOf(params)) {
                // usually for updating `amountOutMin`
                uint256 currentValue = getCalldataValueAtIndex(
                    callData,
                    indexToReplace
                );
                uint8 indexToUpdate = getIndexToUpdateProportionallyToBalanceOf(params);
                uint256 currentValueToReplace = getCalldataValueAtIndex(
                    callData,
                    indexToUpdate
                );

                // replacing value proportionally to difference with balanceOf amount
                replaceCalldataValue(
                    callData,
                    indexToUpdate,
                    currentValueToReplace * balance / currentValue
                );
            }

            replaceCalldataValue(
                callData,
                indexToReplace,
                balance
            );
        }

        // if msg. value doesn't change - no need to update calldata
        if (shouldPassFullNativeBalance(params)) {
            uint256 nativeBalance = address(this).balance;
            if (shouldReplaceNativeBalance(params)) {
                uint8 indexToReplace = getIndexToReplaceWithNativeBalance(params);

                replaceCalldataValue(
                    callData,
                    indexToReplace,
                    nativeBalance
                );
            }

            if (shouldUpdateProportionallyToNativeBalance(params)) {
                uint8 indexToUpdate = getIndexToUpdateProportionallyToNativeBalance(params);

                // usually for updating `amountOutMin`
                uint256 currentValueToReplace = getCalldataValueAtIndex(
                    callData,
                    indexToUpdate
                );

                // replacing value proportionally to difference with native balance amount
                replaceCalldataValue(
                    callData,
                    indexToUpdate,
                    currentValueToReplace * nativeBalance / initialMsgValue
                );
            }
        }
    }

    /**
     * @notice Replaces calldata value at `index` with `newValue`
     * @param callData Calldata memory
     * @param index Index of 32-byte calldata word to replace
     * @param newValue New value to replace with
     */
    function replaceCalldataValue(
        bytes memory callData,
        uint8 index,
        uint256 newValue
    ) internal pure {
        uint256 startIndex = getStartIndex(callData.length, index);

        assembly {
            mstore(add(callData, startIndex), newValue)
        }
    }

    /**
     * @notice Gets uint256 calldata value from specific index
     * @param callData Calldata memory
     * @param index Index of 32-byte calldata word to get
     * @return value uint256 value
     */
    function getCalldataValueAtIndex(
        bytes memory callData,
        uint8 index
    ) internal pure returns(uint256 value) {
        uint256 startIndex = getStartIndex(callData.length, index);

        assembly {
            value := mload(add(callData, startIndex))
        }
    }

    /**
     * @notice Gets amountIn value for approval (amountToSpend)
     * @param params Call params
     * @param callData Calldata memory
     * @return amountIn Amount of tokens that expected to be spent
     */
    function getAmountIn(
        Params params,
        bytes memory callData
    ) internal pure returns(uint256 amountIn) {
        uint256 startIndex = getStartIndex(
            callData.length,
            getIndexOfAmountIn(params)
        );

        assembly {
            amountIn := mload(add(callData, startIndex))
        }
    }

    /**
     * @notice Gets start index for specific value in calldata
     * @param callDataLength Calldata length
     * @param index Index of 32-byte calldata word
     * @return startIndex Start index of value in calldata
     */
    function getStartIndex(uint256 callDataLength, uint256 index) private pure returns(uint256 startIndex) {
        // 32 for prefix + 4 for selector
        startIndex = 32 + 4 + index * 32;

        if (startIndex > callDataLength) {
            revert InvalidIndex(uint32(startIndex), uint32(callDataLength));
        }
    }

    /**
     * @notice Do we want to skip call? Checks all possible conditions to skip the call
     * @param params Call params
     */
    function shouldSkipCall(Params params) internal view returns (bool) {
        if (shouldSkipCallUnconditionally(params)) return true;
        if (shouldSkipCallIfZeroERC20Tokens(params)) {
            uint256 balance = getToken(params).balanceOf(address(this));

            if (balance == 0) return true;
        }

        if (shouldSkipCallIfZeroNativeTokens(params)) {
            uint256 nativeBalance = address(this).balance;

            return nativeBalance == 0;
        }

        return false;
    }

    // --------------------------      BOOLEAN ENCODING      --------------------------

    /**
     * @notice Should this call pass all smart contracts native balance as `msg.value`?
     * @param params Call params
     */
    function shouldPassFullNativeBalance(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(PASS_FULL_NATIVE_BALANCE_SHR, params), 1)}
    }

    /**
     * @notice Do we want to update calldata value proportionally to difference
     * between native tokens balance and value at `indexOfAmountIn` in calldata
     * {newValue} = {oldValue} * {nativeBalance} / {amountIn}?
     * @param params Call params
     */
    function shouldUpdateProportionallyToNativeBalance(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(PROPORTIONALLY_UPDATE_NATIVE_BALANCE_SHR, params), 1)}
    }

    /**
     * @notice do we want to replace calldata value with amount
     * of ERC20 tokens available at the moment before the call? (`balanceOf(address(this))`)
     * @param params Call params
     */
    function shouldReplaceBalanceOf(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(REPLACE_BALANCE_OF_SHR, params), 1)}
    }

    /**
     * @notice Do we want to replace calldata value with amount
     * of native tokens available at the moment before the call?
     * @param params Call params
     */
    function shouldReplaceNativeBalance(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(REPLACE_NATIVE_BALANCE_SHR, params), 1)}
    }

    /**
     * @notice Do we want to update calldata value proportionally to difference
     * between ERC20 tokens balance and value at `indexOfAmountIn` in calldata
     * {newValue} = {oldValue} * {erc20Balance} / {amountIn}?
     * @param params Call params
     */
    function shouldUpdateProportionallyToBalanceOf(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(PROPORTIONALLY_UPDATE_BALANCE_OF_SHR, params), 1)}
    }

    /**
     * @notice Do we want to approve ERC20 token to the target we're about to call?
     * (usually it's a router contract)
     * @param params Call params
     */
    function shouldApproveIfRequired(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(APPROVE_SHR, params), 1)}
    }

    /**
     * @notice Do we want to skip actual call no matter what. Usually will be used if only
     * approval is required
     * @param params Call params
     */
    function shouldSkipCallUnconditionally(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(SKIP_CALL_SHR, params), 1)}
    }

    /**
     * @notice Do we want to skip actual call if ERC20 token balance is zero. Can be used to skip
     * transfer of remaining tokens if there are none
     * @param params Call params
     */
    function shouldSkipCallIfZeroERC20Tokens(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(SKIP_CALL_IF_ZERO_TOKENS_SHR, params), 1)}
    }

    /**
     * @notice Do we want to skip actual call if native token balance is zero. Can be used to skip
     * transfer of remaining tokens if there are none
     * @param params Call params
     */
    function shouldSkipCallIfZeroNativeTokens(Params params) internal pure returns (bool value) {
        assembly {value := and(shr(SKIP_CALL_IF_ZERO_NATIVE_SHR, params), 1)}
    }

    // --------------------------      INDEX ENCODING      --------------------------

    /**
     * @notice Returns index of calldata value that should be replaced with balanceOf amount
     * @param params Call params
     */
    function getIndexToReplaceWithBalanceOf(Params params) internal pure returns (uint8 index) {
        assembly {index := and(shr(BALANCE_OF_REPLACE_INDEX_SHR, params), 0xFF)}
    }

    /**
     * @notice Returns index of calldata value that should be updated proportionally to token balanceOf
     * @param params Call params
     */
    function getIndexToUpdateProportionallyToBalanceOf(Params params) internal pure returns (uint8 index) {
        assembly {index := and(shr(UPDATE_PROPORTIONALLY_TO_BALANCE_OF_INDEX_SHR, params), 0xFF)}
    }

    /**
     * @notice Returns index of calldata value that should be replaced with native balance
     * @param params Call params
     */
    function getIndexToReplaceWithNativeBalance(Params params) internal pure returns (uint8 index) {
        assembly {index := and(shr(NATIVE_BALANCE_REPLACE_INDEX_SHR, params), 0xFF)}
    }

    /**
     * @notice Returns index of calldata value that should be updated proportionally to native balance
     * @param params Call params
     */
    function getIndexToUpdateProportionallyToNativeBalance(Params params) internal pure returns (uint8 index) {
        assembly {index := and(shr(UPDATE_PROPORTIONALLY_TO_NATIVE_BALANCE_INDEX_SHR, params), 0xFF)}
    }

    /**
     * @notice Returns index of value in calldata that should be considered as
     * {amountIn} in case of `shouldUpdateProportionallyToNativeBalance`
     * and `shouldUpdateProportionallyToBalanceOf` calculations
     * @param params Call params
     */
    function getIndexOfAmountIn(Params params) internal pure returns (uint8 index) {
        assembly {index := and(shr(AMOUNT_IN_INDEX_SHR, params), 0xFF)}
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_solver","type":"address"},{"internalType":"address","name":"_factory","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"balanceIndex","type":"uint256"},{"internalType":"uint256","name":"received","type":"uint256"}],"name":"BelowAmountOutMin","type":"error"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"bytes","name":"errorData","type":"bytes"}],"name":"CallFailed","type":"error"},{"inputs":[{"internalType":"uint32","name":"startIndex","type":"uint32"},{"internalType":"uint32","name":"calldataLength","type":"uint32"}],"name":"InvalidIndex","type":"error"},{"inputs":[],"name":"NotASolver","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"SafeERC20FailedOperation","type":"error"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"CallParams.Params","name":"params","type":"bytes32"},{"internalType":"address","name":"target","type":"address"},{"internalType":"uint256","name":"msgValue","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct SolverMulticallV1.Call[]","name":"calls","type":"tuple[]"},{"components":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"minAmount","type":"uint256"}],"internalType":"struct SolverMulticallV1.BalanceCheck[]","name":"balanceChecks","type":"tuple[]"}],"name":"multicall","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"solver","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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