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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.15;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {WETHInterface} from "../interfaces/WETHInterface.sol";
import {IL1ERC20Bridge} from "./interfaces/IL1ERC20Bridge.sol";
import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol";

/// @title L1DepositHelper
/// @notice The L1 deposit helper for depositing tokens to L2 with a permit message
contract L1DepositHelper {
    using SafeTransferLib for ERC20;

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

    /// @notice The L1 bridge contract
    IL1ERC20Bridge public immutable l1Bridge;

    /// @notice The WETH address
    address public immutable weth;

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

    /// @notice Constructor
    /// @param _l1Bridge The L1 bridge
    /// @param _weth The WETH address
    constructor(address _l1Bridge, address _weth) {
        l1Bridge = IL1ERC20Bridge(_l1Bridge);
        weth = _weth;

        // Max approve WETH to the L1 bridge
        ERC20(_weth).safeApprove(_l1Bridge, type(uint256).max);
    }

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

    /// @notice Deposit an amount of the ERC20 to the senders balance on L2 using an EIP-2612 permit signature
    /// @param l1Token Address of the L1 ERC20 we are depositing
    /// @param l2Token Address of the L1 respective L2 ERC20
    /// @param amount Amount of the ERC20 to deposit
    /// @param l2Gas Gas limit required to complete the deposit on L2
    /// @param data Optional data to forward to L2
    /// @param deadline A timestamp, the current blocktime must be less than or equal to this timestamp
    /// @param v Must produce valid secp256k1 signature from the holder along with r and s
    /// @param r Must produce valid secp256k1 signature from the holder along with v and s
    /// @param s Must produce valid secp256k1 signature from the holder along with r and v
    function depositERC20WithPermit(
        address l1Token,
        address l2Token,
        uint256 amount,
        uint32 l2Gas,
        bytes calldata data,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        // Approve the tokens from the sender to this contract
        ERC20(l1Token).permit(msg.sender, address(this), amount, deadline, v, r, s);

        // Transfer the tokens from the sender to this contract
        ERC20(l1Token).safeTransferFrom(msg.sender, address(this), amount);

        // Approve the tokens from this contract to the L1 bridge
        ERC20(l1Token).safeApprove(address(l1Bridge), amount);

        // Deposit the tokens to the senders balance on L2
        l1Bridge.depositERC20To(l1Token, l2Token, msg.sender, amount, l2Gas, data);
    }

    /// @notice Deposit an amount of ERC20 to a recipients balance on L2 using an EIP-2612 permit signature
    /// @param l1Token Address of the L1 ERC20 we are depositing
    /// @param l2Token Address of the L1 respective L2 ERC20
    /// @param to The recipient address on L2
    /// @param amount Amount of the ERC20 to deposit
    /// @param l2Gas Gas limit required to complete the deposit on L2
    /// @param data Optional data to forward to L2
    /// @param deadline A timestamp, the current blocktime must be less than or equal to this timestamp
    /// @param v Must produce valid secp256k1 signature from the holder along with r and s
    /// @param r Must produce valid secp256k1 signature from the holder along with v and s
    /// @param s Must produce valid secp256k1 signature from the holder along with r and v
    function depositERC20ToWithPermit(
        address l1Token,
        address l2Token,
        address to,
        uint256 amount,
        uint32 l2Gas,
        bytes calldata data,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        // Approve the tokens from the sender to this contract
        ERC20(l1Token).permit(msg.sender, address(this), amount, deadline, v, r, s);

        // Transfer the tokens from the sender to this contract
        ERC20(l1Token).safeTransferFrom(msg.sender, address(this), amount);

        // Approve the tokens from this contract to the L1 bridge
        ERC20(l1Token).safeApprove(address(l1Bridge), amount);

        // Deposit the tokens to the recipients balance on L2
        l1Bridge.depositERC20To(l1Token, l2Token, to, amount, l2Gas, data);
    }

    /// @notice Deposit an amount of ETH as WETH to the senders balance on L2
    /// @param l2Token Address of the L1 respective L2 ERC20
    /// @param l2Gas Gas limit required to complete the deposit on L2
    /// @param data Optional data to forward to L2
    function depositWETH(address l2Token, uint32 l2Gas, bytes calldata data) external payable {
        // Mint WETH
        WETHInterface(weth).deposit{value: msg.value}();

        // Deposit the tokens to the senders balance on L2
        l1Bridge.depositERC20To(weth, l2Token, msg.sender, msg.value, l2Gas, data);
    }

    /// @notice Deposit an amount of ETH as WETH to the senders balance on L2
    /// @param l2Token Address of the L1 respective L2 ERC20
    /// @param to The recipient address on L2
    /// @param l2Gas Gas limit required to complete the deposit on L2
    /// @param data Optional data to forward to L2
    function depositWETHTo(address l2Token, address to, uint32 l2Gas, bytes calldata data) external payable {
        // Mint WETH
        WETHInterface(weth).deposit{value: msg.value}();

        // Deposit the tokens to the recipients balance on L2
        l1Bridge.depositERC20To(weth, l2Token, to, msg.value, l2Gas, data);
    }
}

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

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

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

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

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

    string public name;

    string public symbol;

    uint8 public immutable decimals;

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

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

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

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

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

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

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

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

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

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

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

        return true;
    }

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

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

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

        return true;
    }

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

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

        balanceOf[from] -= amount;

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

        emit Transfer(from, to, amount);

        return true;
    }

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

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

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

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

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.15;

/// @title Interface for WETH9
interface WETHInterface {
    /// @notice Deposit ether to get wrapped ether
    function deposit() external payable;

    /// @notice Withdraw wrapped ether to get ether
    function withdraw(uint256) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >0.5.0 <0.9.0;

/**
 * @title IL1ERC20Bridge
 */
interface IL1ERC20Bridge {
    /**
     *
     * Events *
     *
     */

    event ERC20DepositInitiated(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    event ERC20WithdrawalFinalized(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    /**
     *
     * Public Functions *
     *
     */

    /**
     * @dev get the address of the corresponding L2 bridge contract.
     * @return Address of the corresponding L2 bridge contract.
     */
    function l2TokenBridge() external returns (address);

    /**
     * @dev deposit an amount of the ERC20 to the caller's balance on L2.
     * @param _l1Token Address of the L1 ERC20 we are depositing
     * @param _l2Token Address of the L1 respective L2 ERC20
     * @param _amount Amount of the ERC20 to deposit
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function depositERC20(address _l1Token, address _l2Token, uint256 _amount, uint32 _l2Gas, bytes calldata _data)
        external;

    /**
     * @dev deposit an amount of ERC20 to a recipient's balance on L2.
     * @param _l1Token Address of the L1 ERC20 we are depositing
     * @param _l2Token Address of the L1 respective L2 ERC20
     * @param _to L2 address to credit the withdrawal to.
     * @param _amount Amount of the ERC20 to deposit.
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function depositERC20To(
        address _l1Token,
        address _l2Token,
        address _to,
        uint256 _amount,
        uint32 _l2Gas,
        bytes calldata _data
    ) external;

    /**
     *
     * Cross-chain Functions *
     *
     */

    /**
     * @dev Complete a withdrawal from L2 to L1, and credit funds to the recipient's balance of the
     * L1 ERC20 token.
     * This call will fail if the initialized withdrawal from L2 has not been finalized.
     *
     * @param _l1Token Address of L1 token to finalizeWithdrawal for.
     * @param _l2Token Address of L2 token where withdrawal was initiated.
     * @param _from L2 address initiating the transfer.
     * @param _to L1 address to credit the withdrawal to.
     * @param _amount Amount of the ERC20 to deposit.
     * @param _data Data provided by the sender on L2. This data is provided
     *   solely as a convenience for external contracts. Aside from enforcing a maximum
     *   length, these contracts provide no guarantees about its content.
     */
    function finalizeERC20Withdrawal(
        address _l1Token,
        address _l2Token,
        address _from,
        address _to,
        uint256 _amount,
        bytes calldata _data
    ) external;
}

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

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

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

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

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

        require(success, "ETH_TRANSFER_FAILED");
    }

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

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

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

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

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

        require(success, "TRANSFER_FROM_FAILED");
    }

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

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

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

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

        require(success, "TRANSFER_FAILED");
    }

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

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

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

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

        require(success, "APPROVE_FAILED");
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/contracts/",
    "solmate/=lib/solmate/src/",
    "lib/forge-std:ds-test/=lib/forge-std/lib/ds-test/src/",
    "lib/solmate:ds-test/=lib/solmate/lib/ds-test/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_l1Bridge","type":"address"},{"internalType":"address","name":"_weth","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"l1Token","type":"address"},{"internalType":"address","name":"l2Token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint32","name":"l2Gas","type":"uint32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"depositERC20ToWithPermit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"l1Token","type":"address"},{"internalType":"address","name":"l2Token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint32","name":"l2Gas","type":"uint32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"depositERC20WithPermit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"l2Token","type":"address"},{"internalType":"uint32","name":"l2Gas","type":"uint32"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"depositWETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"l2Token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint32","name":"l2Gas","type":"uint32"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"depositWETHTo","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"l1Bridge","outputs":[{"internalType":"contract IL1ERC20Bridge","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"weth","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000004082c9647c098a6493fb499eae63b5ce3259c574000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : _l1Bridge (address): 0x4082C9647c098a6493fb499EaE63b5ce3259c574
Arg [1] : _weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000004082c9647c098a6493fb499eae63b5ce3259c574
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2