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// SPDX-FileCopyrightText: Hadron Labs
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.19;

import { IAxelarGateway } from "@axelar-network/axelar-gmp-sdk-solidity/contracts/interfaces/IAxelarGateway.sol";
import { IAxelarGasService } from "@axelar-network/axelar-gmp-sdk-solidity/contracts/interfaces/IAxelarGasService.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC20Permit } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol";

interface IWSTETH is IERC20, IERC20Permit {}

/// @title GMP helper which makes it easier to call Lido Satellite on Neutron
/// @author Murad Karammaev
/// @notice Default flow (without a GMP Helper) is to:
///           1. tx approve() on wstETH contract
///           2. tx payNativeGasForContractCallWithToken() on Axelar Gas Service
///           3. tx callContractWithToken() on Axelar gateway
///         This contract simplifies it to:
///           1. tx approve() on wstETH contract
///           2. tx send() on GMP Helper
///         It is also possible to simplify it further if user wallet supports EIP-712 signing:
///           1. tx sendWithPermit() on GMP Helper
contract GmpHelper {
    IAxelarGasService public immutable GAS_SERVICE;
    IAxelarGateway public immutable GATEWAY;
    IWSTETH public immutable WST_ETH;
    // Address of Lido Satellite contract on Neutron, replace it with a real address before deploying
    string public constant LIDO_SATELLITE = "neutron1ug740qrkquxzrk2hh29qrlx3sktkfml3je7juusc2te7xmvsscns0n2wry";
    string public constant DESTINATION_CHAIN = "neutron";
    string public constant WSTETH_SYMBOL = "wstETH";

    /// @notice Construct GMP Helper
    /// @param axelarGateway Address of Axelar Gateway contract
    /// @param axelarGasReceiver Address of Axelar Gas Service contract
    /// @param wstEth Address of Wrapped Liquid Staked Ether contract
    constructor(
        address axelarGateway,
        address axelarGasReceiver,
        address wstEth
    ) {
        GAS_SERVICE = IAxelarGasService(axelarGasReceiver);
        GATEWAY = IAxelarGateway(axelarGateway);
        WST_ETH = IWSTETH(wstEth);
    }

    /// @notice Send `amount` of wstETH to `receiver` on Neutron.
    ///         Requires allowance on wstETH contract.
    ///         Requires gas fee in ETH.
    /// @param receiver Address on Neutron which shall receive canonical wstETH
    /// @param amount Amount of wstETH-wei to send to `receiver`
    /// @param gasRefundAddress Address which receives ETH refunds from Axelar,
    ///        use 0 to default to msg.sender
    function send(
        string calldata receiver,
        uint256 amount,
        address gasRefundAddress
    ) external payable {
        _send(receiver, amount, gasRefundAddress);
    }

    /// @notice Send `amount` of wstETH to `receiver` on Neutron, using EIP-2612 permit.
    ///         Requires gas fee in ETH.
    /// @param receiver Address on Neutron which shall receive canonical wstETH
    /// @param amount Amount of wstETH-wei to send to `receiver`
    /// @param deadline EIP-2612 permit signature deadline
    /// @param v Value `v` of EIP-2612 permit signature
    /// @param r Value `r` of EIP-2612 permit signature
    /// @param s Value `s` of EIP-2612 permit signature
    /// @param gasRefundAddress Address which receives ETH refunds from Axelar,
    ///        use 0 to default to msg.sender
    function sendWithPermit(
        string calldata receiver,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s,
        address gasRefundAddress
    ) external payable {
        WST_ETH.permit(msg.sender, address(this), amount, deadline, v, r, s);
        _send(receiver, amount, gasRefundAddress);
    }

    function _send(
        string calldata receiver,
        uint256 amount,
        address gasRefundAddress
    ) internal {
        // 1. withdraw wstETH from caller and approve it for Axelar Gateway.
        // Gateway will attempt to transfer funds from address(this), hence we
        // are forced to withdraw them from caller account first.
        WST_ETH.transferFrom(msg.sender, address(this), amount);
        WST_ETH.approve(address(GATEWAY), amount);

        // 2. Generate GMP payload
        bytes memory payload = _encodeGmpPayload(receiver);

        // 3. Pay for gas
        GAS_SERVICE.payNativeGasForContractCallWithToken{value: msg.value}(
            address(this),
            DESTINATION_CHAIN,
            LIDO_SATELLITE,
            payload,
            WSTETH_SYMBOL,
            amount,
            gasRefundAddress == address(0) ? msg.sender : gasRefundAddress
        );

        // 4. Make GMP call
        GATEWAY.callContractWithToken(
            DESTINATION_CHAIN,
            LIDO_SATELLITE,
            payload,
            WSTETH_SYMBOL,
            amount
        );
    }

    function _encodeGmpPayload(
        string memory targetReceiver
    ) internal pure returns (bytes memory) {
        require(bytes(targetReceiver).length > 8, "receiver address is too short"); // len("neutron1") == 8
        require(bytes(targetReceiver).length <= 256, "receiver address is too long");

        bytes memory prefix = bytes("neutron1");
        for (uint8 i = 0; i < prefix.length; i++) {
            require(bytes(targetReceiver)[i] == prefix[i], "receiver: incorrect prefix");
        }

        bytes memory argValues = abi.encode(
            targetReceiver
        );

        string[] memory argumentNameArray = new string[](1);
        argumentNameArray[0] = "receiver";

        string[] memory abiTypeArray = new string[](1);
        abiTypeArray[0] = "string";

        bytes memory gmpPayload;
        gmpPayload = abi.encode(
            "mint",
            argumentNameArray,
            abiTypeArray,
            argValues
        );

        return abi.encodePacked(
            bytes4(0x00000001),
            gmpPayload
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// This should be owned by the microservice that is paying for gas.
interface IAxelarGasService {
    error NothingReceived();
    error InvalidAddress();
    error NotCollector();
    error InvalidAmounts();

    event GasPaidForContractCall(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event GasPaidForContractCallWithToken(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeGasPaidForContractCall(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeGasPaidForContractCallWithToken(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event GasPaidForExpressCallWithToken(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeGasPaidForExpressCallWithToken(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event GasAdded(
        bytes32 indexed txHash,
        uint256 indexed logIndex,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeGasAdded(bytes32 indexed txHash, uint256 indexed logIndex, uint256 gasFeeAmount, address refundAddress);

    event ExpressGasAdded(
        bytes32 indexed txHash,
        uint256 indexed logIndex,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeExpressGasAdded(
        bytes32 indexed txHash,
        uint256 indexed logIndex,
        uint256 gasFeeAmount,
        address refundAddress
    );

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForContractCall(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForContractCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForContractCall(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        address refundAddress
    ) external payable;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForContractCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address refundAddress
    ) external payable;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForExpressCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForExpressCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address refundAddress
    ) external payable;

    function addGas(
        bytes32 txHash,
        uint256 txIndex,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    function addNativeGas(
        bytes32 txHash,
        uint256 logIndex,
        address refundAddress
    ) external payable;

    function addExpressGas(
        bytes32 txHash,
        uint256 txIndex,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    function addNativeExpressGas(
        bytes32 txHash,
        uint256 logIndex,
        address refundAddress
    ) external payable;

    function collectFees(
        address payable receiver,
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external;

    function refund(
        address payable receiver,
        address token,
        uint256 amount
    ) external;

    function gasCollector() external returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IAxelarGateway {
    /**********\
    |* Errors *|
    \**********/

    error NotSelf();
    error NotProxy();
    error InvalidCodeHash();
    error SetupFailed();
    error InvalidAuthModule();
    error InvalidTokenDeployer();
    error InvalidAmount();
    error InvalidChainId();
    error InvalidCommands();
    error TokenDoesNotExist(string symbol);
    error TokenAlreadyExists(string symbol);
    error TokenDeployFailed(string symbol);
    error TokenContractDoesNotExist(address token);
    error BurnFailed(string symbol);
    error MintFailed(string symbol);
    error InvalidSetMintLimitsParams();
    error ExceedMintLimit(string symbol);

    /**********\
    |* Events *|
    \**********/

    event TokenSent(
        address indexed sender,
        string destinationChain,
        string destinationAddress,
        string symbol,
        uint256 amount
    );

    event ContractCall(
        address indexed sender,
        string destinationChain,
        string destinationContractAddress,
        bytes32 indexed payloadHash,
        bytes payload
    );

    event ContractCallWithToken(
        address indexed sender,
        string destinationChain,
        string destinationContractAddress,
        bytes32 indexed payloadHash,
        bytes payload,
        string symbol,
        uint256 amount
    );

    event Executed(bytes32 indexed commandId);

    event TokenDeployed(string symbol, address tokenAddresses);

    event ContractCallApproved(
        bytes32 indexed commandId,
        string sourceChain,
        string sourceAddress,
        address indexed contractAddress,
        bytes32 indexed payloadHash,
        bytes32 sourceTxHash,
        uint256 sourceEventIndex
    );

    event ContractCallApprovedWithMint(
        bytes32 indexed commandId,
        string sourceChain,
        string sourceAddress,
        address indexed contractAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        bytes32 sourceTxHash,
        uint256 sourceEventIndex
    );

    event TokenMintLimitUpdated(string symbol, uint256 limit);

    event OperatorshipTransferred(bytes newOperatorsData);

    event Upgraded(address indexed implementation);

    /********************\
    |* Public Functions *|
    \********************/

    function sendToken(
        string calldata destinationChain,
        string calldata destinationAddress,
        string calldata symbol,
        uint256 amount
    ) external;

    function callContract(
        string calldata destinationChain,
        string calldata contractAddress,
        bytes calldata payload
    ) external;

    function callContractWithToken(
        string calldata destinationChain,
        string calldata contractAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount
    ) external;

    function isContractCallApproved(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        address contractAddress,
        bytes32 payloadHash
    ) external view returns (bool);

    function isContractCallAndMintApproved(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        address contractAddress,
        bytes32 payloadHash,
        string calldata symbol,
        uint256 amount
    ) external view returns (bool);

    function validateContractCall(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes32 payloadHash
    ) external returns (bool);

    function validateContractCallAndMint(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes32 payloadHash,
        string calldata symbol,
        uint256 amount
    ) external returns (bool);

    /***********\
    |* Getters *|
    \***********/

    function authModule() external view returns (address);

    function tokenDeployer() external view returns (address);

    function tokenMintLimit(string memory symbol) external view returns (uint256);

    function tokenMintAmount(string memory symbol) external view returns (uint256);

    function allTokensFrozen() external view returns (bool);

    function implementation() external view returns (address);

    function tokenAddresses(string memory symbol) external view returns (address);

    function tokenFrozen(string memory symbol) external view returns (bool);

    function isCommandExecuted(bytes32 commandId) external view returns (bool);

    function adminEpoch() external view returns (uint256);

    function adminThreshold(uint256 epoch) external view returns (uint256);

    function admins(uint256 epoch) external view returns (address[] memory);

    /*******************\
    |* Admin Functions *|
    \*******************/

    function setTokenMintLimits(string[] calldata symbols, uint256[] calldata limits) external;

    function upgrade(
        address newImplementation,
        bytes32 newImplementationCodeHash,
        bytes calldata setupParams
    ) external;

    /**********************\
    |* External Functions *|
    \**********************/

    function setup(bytes calldata params) external;

    function execute(bytes calldata input) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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

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

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

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

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

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

{
  "optimizer": {
    "enabled": true,
    "runs": 5000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"axelarGateway","type":"address"},{"internalType":"address","name":"axelarGasReceiver","type":"address"},{"internalType":"address","name":"wstEth","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"DESTINATION_CHAIN","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GAS_SERVICE","outputs":[{"internalType":"contract IAxelarGasService","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GATEWAY","outputs":[{"internalType":"contract IAxelarGateway","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LIDO_SATELLITE","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WSTETH_SYMBOL","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WST_ETH","outputs":[{"internalType":"contract IWSTETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"receiver","type":"string"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"gasRefundAddress","type":"address"}],"name":"send","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"string","name":"receiver","type":"string"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"},{"internalType":"address","name":"gasRefundAddress","type":"address"}],"name":"sendWithPermit","outputs":[],"stateMutability":"payable","type":"function"}]

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0000000000000000000000004f4495243837681061c4743b74b3eedf548d56a50000000000000000000000002d5d7d31f671f86c782533cc367f14109a0827120000000000000000000000007f39c581f595b53c5cb19bd0b3f8da6c935e2ca0

-----Decoded View---------------
Arg [0] : axelarGateway (address): 0x4F4495243837681061C4743b74B3eEdf548D56A5
Arg [1] : axelarGasReceiver (address): 0x2d5d7d31F671F86C782533cc367F14109a082712
Arg [2] : wstEth (address): 0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000004f4495243837681061c4743b74b3eedf548d56a5
Arg [1] : 0000000000000000000000002d5d7d31f671f86c782533cc367f14109a082712
Arg [2] : 0000000000000000000000007f39c581f595b53c5cb19bd0b3f8da6c935e2ca0