Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

import {MerkleProof} from "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import {ERC165, IERC165} from "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import {IBurnRedeemable} from "./interfaces/IBurnRedeemable.sol";
import {IBurnableToken} from "./interfaces/IBurnableToken.sol";
import {ICore} from "./interfaces/ICore.sol";
import {IvXNF} from "./interfaces/IvXNF.sol";
import {IALX} from "./interfaces/IALX.sol";
import {Bridge} from "./base/Bridge.sol";

/*
 * @title vXNF Contract
 *
 * @notice Implements the vXNF token, an ERC20 token with advanced bridging and burning capabilities.
 *
 * @dev This contract extends the Bridge contract and implements IvXNF and ERC165 interfaces.
 *      It provides functionalities for burning XNF tokens, minting vXNF tokens, and bridging
 *      tokens across different EVM chains using LayerZero, Axelar, and Wormhole protocols.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/xenify_io
 * - Telegram: https://t.me/xenify_io
 * - Website: https://xenify.io
 *
 * Disclaimer:
 * This contract aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralization.
 * Engaging with this contract involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this contract, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this contract, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Xenify (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this contract. Any use beyond the scope defined herein may be subject to legal action.
 */
contract vXNF is
    Bridge,
    IvXNF,
    ERC165
{

    /// ------------------------------------ VARIABLES ------------------------------------- \\\

    /**
     * @notice Immutable team address used for setting XNF address.
     * @dev This address has the exclusive right to set the XNF token address and ratio.
     */
    address public team;

    /**
     * @notice Ratio used for token conversions between XNF and vXNF.
     * @dev This ratio determines how many XNF tokens are equivalent to one vXNF token.
     */
    uint256 public RATIO;

    /// ------------------------------------ INTERFACES ------------------------------------- \\\

    /**
     * @notice Interface to interact with the XNF token contract.
     * @dev This interface allows for burning XNF tokens and other token-specific operations.
     */
    IBurnableToken public XNF;

    /// ------------------------------------ CONSTRUCTOR ------------------------------------ \\\

    /**
     * @notice Constructs the vXNF token and initialises its dependencies.
     * @dev Sets up the vXNF token with references to other contracts and initialises the token supply.
     * @param _ratio The initial ratio between vXNF and XNF used for minting and burning.
     * @param _XNF The address of the XNF token contract.
     * @param _gateway Address of the Axelar gateway contract.
     * @param _gasService Address of the Axelar gas service contract.
     * @param _endpoint Address of the LayerZero endpoint contract.
     * @param _wormholeRelayer Address of the Wormhole relayer contract.
     * @param _teamAddress Address of the team's wallet.
     * @param users Array of addresses to receive initial token allocation.
     * @param amounts Array of token amounts corresponding to each address in 'users'.
     */
    constructor(
        uint256 _ratio,
        address _XNF,
        address _gateway,
        address _gasService,
        address _endpoint,
        address _wormholeRelayer,
        address _teamAddress,
        address[] memory users,
        uint256[] memory amounts
    ) payable
        Bridge(
            "vXNF",
            "vXNF",
            _gateway,
            _gasService,
            _endpoint,
            _wormholeRelayer
        )
    {
        XNF = IBurnableToken(_XNF);
        RATIO = _ratio;
        team = _teamAddress;
        for (uint256 i = 0; i < users.length; i++) {
            _mint(users[i], amounts[i]);
        }
    }

    /// --------------------------------- EXTERNAL FUNCTIONS -------------------------------- \\\

    /**
     * @notice A hook triggered post token burning.
     * @dev This function is called after tokens are burned. It currently has no implementation
     *      but can be overridden for additional post-burn logic if needed in the future.
     * @param user The address of the user whose tokens were burned.
     * @param amount The amount of tokens that were burned.
     */
    function onTokenBurned(
        address user,
        uint256 amount
    ) external {}

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns a specified quantity of XNF tokens and mints an equivalent quantity of vXNF tokens.
     * @dev This function burns XNF tokens from the sender and mints vXNF tokens according to the defined RATIO.
     * @param _amount The volume of XNF tokens to burn.
     */
    function burnXNF(uint256 _amount) external override {
        XNF.burn(msg.sender, _amount);
        uint256 amt;
        unchecked {
            amt = _amount / RATIO;
        }
        _mint(msg.sender, amt);
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns XNF tokens and bridges the equivalent vXNF tokens via the LayerZero network.
     * @dev Burns XNF tokens, mints vXNF, and initiates a bridge operation using LayerZero.
     * @param _amount The amount of XNF tokens to burn.
     * @param _dstChainId The Chain ID of the destination chain on the LayerZero network.
     * @param _to The recipient address on the destination chain.
     * @param _feeRefundAddress Address to refund any excess fees.
     * @param _zroPaymentAddress Address of the ZRO token holder who would pay for the transaction.
     * @param _adapterParams Parameters for custom functionality.
     */
    function burnAndBridgeViaLayerZero(
        uint256 _amount,
        uint16 _dstChainId,
        address _to,
        address payable _feeRefundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    ) external payable override {
        XNF.burn(msg.sender, _amount);
        uint256 amt;
        unchecked {
            amt = _amount / RATIO;
        }
        _mint(msg.sender, amt);
        bridgeViaLayerZero(
            _dstChainId,
            msg.sender,
            _to,
            amt,
            _feeRefundAddress,
            _zroPaymentAddress,
            _adapterParams
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns XNF tokens and bridges the equivalent vXNF tokens via the Axelar network.
     * @dev Burns XNF tokens, mints vXNF, and initiates a bridge operation using Axelar.
     * @param _amount The amount of XNF tokens to burn.
     * @param _dstChainId The target chain where tokens should be bridged to on the Axelar network.
     * @param _to The recipient address on the destination chain.
     * @param _feeRefundAddress Address to refund any excess fees.
     */
    function burnAndBridgeViaAxelar(
        uint256 _amount,
        string calldata _dstChainId,
        address _to,
        address payable _feeRefundAddress
    ) external payable override {
        XNF.burn(msg.sender, _amount);
        uint256 amt;
        unchecked {
            amt = _amount / RATIO;
        }
        _mint(msg.sender, amt);
        bridgeViaAxelar(
            _dstChainId,
            msg.sender,
            _to,
            amt,
            _feeRefundAddress
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns XNF tokens and bridges the equivalent vXNF tokens via the Wormhole network.
     * @dev Burns XNF tokens, mints vXNF, and initiates a bridge operation using Wormhole.
     * @param _amount The amount of XNF tokens to burn.
     * @param _targetChain The ID of the target chain on the Wormhole network.
     * @param _to The recipient address on the destination chain.
     * @param _feeRefundAddress Address to refund any excess fees.
     * @param _gasLimit The gas limit for the transaction on the destination chain.
     */
    function burnAndBridgeViaWormhole(
        uint256 _amount,
        uint16 _targetChain,
        address _to,
        address payable _feeRefundAddress,
        uint256 _gasLimit
    ) external payable override {
        XNF.burn(msg.sender, _amount);
        uint256 amt;
        unchecked {
            amt = _amount / RATIO;
        }
        _mint(msg.sender, amt);
        bridgeViaWormhole(
            _targetChain,
            msg.sender,
            _to,
            amt,
            _feeRefundAddress,
            _gasLimit
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns a specific amount of vXNF tokens from a user's address.
     * @dev Allows an external entity to burn tokens from a user's address, given proper allowance.
     * @param _user The address from which the vXNF tokens will be burned.
     * @param _amount The amount of vXNF tokens to burn.
     */
    function burn(address _user, uint256 _amount) external override {
        if (_user != msg.sender)
            _spendAllowance(_user, msg.sender, _amount);
        _burn(_user, _amount);
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Sets the XNF contract address and the conversion ratio.
     * @dev This function can only be called once by the team address to set the XNF contract and ratio.
     * @param _XNF The XNF contract address.
     * @param _ratio The ratio between vXNF and XNF used for minting and burning.
     */
    function setXNFAndRatio(address _XNF, uint256 _ratio) external override {
        if (msg.sender != team) {
            revert OnlyTeamAllowed();
        }
        if (address(XNF) != address(0)) {
            revert XNFIsAlreadySet();
        }
        XNF = IBurnableToken(_XNF);
        RATIO = _ratio;
    }

    /// ---------------------------------- PUBLIC FUNCTION ---------------------------------- \\\

    /**
     * @notice Checks if a given interface ID is supported by the contract.
     * @dev Implements the IERC165 standard for interface detection.
     * @param _interfaceId The ID of the interface in question.
     * @return bool `true` if the interface is supported, otherwise `false`.
     */
    function supportsInterface(bytes4 _interfaceId)
        public
        view
        override
        returns (bool)
    {
        return _interfaceId == type(IBurnRedeemable).interfaceId || super.supportsInterface(_interfaceId);
    }

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

import {StringToAddress, AddressToString} from "@axelar-network/axelar-gmp-sdk-solidity/contracts/utils/AddressString.sol";
import {IAxelarGasService} from "@axelar-network/axelar-gmp-sdk-solidity/contracts/interfaces/IAxelarGasService.sol";
import {AxelarExecutable} from "@axelar-network/axelar-gmp-sdk-solidity/contracts/executable/AxelarExecutable.sol";
import {ILayerZeroEndpoint} from "@layerzerolabs/lz-evm-sdk-v1-0.7/contracts/interfaces/ILayerZeroEndpoint.sol";
import {IWormholeRelayer} from "../interfaces/IWormholeRelayer.sol";
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IBridgeToken} from "../interfaces/IBridgeToken.sol";

/*
 * @title Bridge Contract
 *
 * @notice This contract facilitates cross-chain token bridging, utilising LayerZero, Axelar, and Wormhole protocols for interoperable token transfers.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This contract aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this contract involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this contract, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this contract, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this contract. Any use beyond the scope defined herein may be subject to legal action.
 */
abstract contract Bridge is
    AxelarExecutable,
    IBridgeToken,
    ERC20
{

    /// ------------------------------------- LIBRARYS ------------------------------------- \\\

    /**
     * @notice Utilise StringToAddress for converting string to address format.
     * @dev This library provides functions to convert strings to addresses.
     */
    using StringToAddress for string;

    /**
     * @notice Utilise AddressToString for converting address to string format.
     * @dev This library provides functions to convert addresses to strings.
     */
    using AddressToString for address;

    /// ------------------------------------ VARIABLES ------------------------------------- \\\

    /**
     * @notice Address of this token in a string format.
     * @dev This is used for identifying this contract's address in string format across various bridging protocols.
     */
    string public addressThis;

    /**
     * @notice Interface to interact with LayerZero endpoint for bridging operations.
     * @dev This endpoint is used to interact with LayerZero for cross-chain token transfers.
     */
    ILayerZeroEndpoint public immutable ENDPOINT;

    /**
     * @notice Interface to interact with Axelar gas service for estimating transaction fees.
     * @dev This gas service is used to estimate and pay for the gas fees required for Axelar's cross-chain operations.
     */
    IAxelarGasService public immutable GAS_SERVICE;

    /**
     * @notice Interface to interact with Wormhole relayer for bridging operations.
     * @dev This relayer is used to facilitate cross-chain transfers using the Wormhole protocol.
     */
    IWormholeRelayer public immutable WORMHOLE_RELAYER;

    /// ------------------------------------- MAPPING --------------------------------------- \\\

    /**
     * @notice Mapping to prevent replay attacks by storing processed delivery hashes.
     * @dev This mapping keeps track of delivery hashes that have already been processed to prevent replay attacks.
     */
    mapping (bytes32 => bool) public seenDeliveryVaaHashes;

    /// ------------------------------------- MODIFIER -------------------------------------- \\\

    /**
     * @notice Ensures that a Wormhole message is processed only once to prevent replay attacks.
     * @dev This modifier checks if the provided `_deliveryHash` has already been seen. If it has, the transaction is reverted
     * to prevent duplicate processing of the same message. If the `_deliveryHash` is new, it marks it as seen to ensure
     * the message can't be processed again, thereby securing the contract against replay attacks.
     * @param _deliveryHash Unique hash representing the delivery message from the Wormhole relayer, used to track message processing.
     */
    modifier replayProtect(bytes32 _deliveryHash) {
        if (seenDeliveryVaaHashes[_deliveryHash]) {
            revert WormholeMessageAlreadyProcessed();
        }
        seenDeliveryVaaHashes[_deliveryHash] = true;
        _;
    }

    /// ------------------------------------ CONSTRUCTOR ------------------------------------ \\\

    /**
     * @notice Initialises a new Bridge contract instance.
     * @dev Sets up the essential external contracts and services necessary for bridge operations,
     * including LayerZero endpoint, Axelar gas service, and Wormhole relayer.
     * @param _name The name of the bridge token.
     * @param _symbol The symbol of the bridge token.
     * @param _gateway The address of the Axelar gateway contract.
     * @param _gasService The address of the Axelar gas service contract.
     * @param _endpoint The address of the LayerZero endpoint contract.
     * @param _wormholeRelayer The address of the Wormhole relayer contract.
     */
    constructor(
        string memory _name,
        string memory _symbol,
        address _gateway,
        address _gasService,
        address _endpoint,
        address _wormholeRelayer
    ) ERC20(_name, _symbol) AxelarExecutable(_gateway) {
        GAS_SERVICE = IAxelarGasService(_gasService);
        ENDPOINT = ILayerZeroEndpoint(_endpoint);
        WORMHOLE_RELAYER = IWormholeRelayer(_wormholeRelayer);
        addressThis = address(this).toString();
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Handles the receipt of ALX tokens sent via the LayerZero bridge.
     * @dev Called by the LayerZero endpoint to mint ALX tokens for the recipient after a successful cross-chain transfer.
     * Validates the caller to ensure it's the LayerZero endpoint and checks the source address matches the expected format.
     * Decodes the payload to mint the correct amount of ALX tokens to the rightful recipient.
     * @param _srcChainId The source chain's identifier in the LayerZero network from which the tokens are bridged.
     * @param _srcAddress Encoded source address from which the tokens were sent, expected to match this contract's address.
     * @param _payload Encoded data comprising the sender's and recipient's addresses and the amount of ALX tokens to be minted.
     */
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64,
        bytes memory _payload
    )
        external
        override
    {
        if (address(ENDPOINT) != msg.sender) {
            revert NotVerifiedCaller();
        }
        if (address(this) != address(uint160(bytes20(_srcAddress)))) {
            revert InvalidLayerZeroSourceAddress();
        }
        (address _from, address _to, uint256 _amount) = abi.decode(
            _payload,
            (address, address, uint256)
        );
        _mint(_to, _amount);
        emit BridgeReceive(
            _to,
            _amount,
            BridgeId.LayerZero,
            abi.encode(_srcChainId),
            _from
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Handles incoming token transfers via the Wormhole bridge.
     * @dev This function is designed to be invoked by the Wormhole relayer upon the successful bridging of tokens from another chain.
     * It extracts the destination address and the amount from the encoded payload and mints the tokens to the recipient's address.
     * Ensures that the function is only callable by the Wormhole relayer and verifies the source address for security purposes.
     * @param _payload Encoded information including the recipient's address and the amount of tokens to mint.
     * @param _sourceAddress The originating address from the source chain, encoded in bytes32.
     * @param _srcChainId Identifier of the source chain from where the bridge transaction originates.
     * @param _deliveryHash Unique hash used for replay protection and verification of the relay call's authenticity.
     */
    function receiveWormholeMessages(
        bytes memory _payload,
        bytes[] memory,
        bytes32 _sourceAddress,
        uint16 _srcChainId,
        bytes32 _deliveryHash
    )
        external
        payable
        override
        replayProtect(_deliveryHash)
    {
        if (msg.sender != address(WORMHOLE_RELAYER)) {
            revert OnlyRelayerAllowed();
        }
        if (address(this) != address(uint160(uint256(_sourceAddress)))) {
            revert InvalidWormholeSourceAddress();
        }
        (address _from, address _to, uint256 _amount) = abi.decode(
            _payload,
            (address, address, uint256)
        );
        _mint(_to, _amount);
        emit BridgeReceive(
            _to,
            _amount,
            BridgeId.Wormhole,
            abi.encode(_srcChainId),
            _from
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Bridges tokens to a specified chain using the LayerZero protocol.
     * @dev Constructs the necessary payload and initiates a token bridge operation via the LayerZero endpoint.
     * The function checks if sufficient Ether is provided for the gas fee and then proceeds to burn the tokens from the sender's address.
     * @param _dstChainId The ID of the destination chain within the LayerZero network.
     * @param _from The address initiating the token bridge on the source chain.
     * @param _to The address on the destination chain to receive the tokens.
     * @param _amount The number of tokens to bridge.
     * @param _feeRefundAddress The address to receive refunds for any excess fee paid.
     * @param _zroPaymentAddress Address holding ZRO tokens to cover fees, if applicable.
     * @param _adapterParams Parameters for the LayerZero adapter, providing additional bridging configurations.
     */
    function bridgeViaLayerZero(
        uint16 _dstChainId,
        address _from,
        address _to,
        uint256 _amount,
        address payable _feeRefundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    )
        public
        payable
        override
    {
        if (_zroPaymentAddress == address(0)) {
            if (msg.value < estimateGasForLayerZero(
                    _dstChainId,
                    _from,
                    _to,
                    _amount,
                    false,
                    _adapterParams
                    )
                )
            {
                revert InsufficientFee();
            }
        }
        else {
            if (msg.value < estimateGasForLayerZero(
                    _dstChainId,
                    _from,
                    _to,
                    _amount,
                    true,
                    _adapterParams
                    )
                )
            {
                revert InsufficientFee();
            }
        }
        if (msg.sender != _from)
            _spendAllowance(
                _from,
                msg.sender,
                _amount
            );
        _burn(_from, _amount);
        if (_to == address(0)) {
            revert InvalidToAddress();
        }
        ENDPOINT.send{value: msg.value} (
            _dstChainId,
            abi.encodePacked(address(this),address(this)),
            abi.encode(
                _from,
                _to,
                _amount
            ),
            _feeRefundAddress,
            _zroPaymentAddress,
            _adapterParams
        );
        emit BridgeTransfer(
            _from,
            _amount,
            BridgeId.LayerZero,
            abi.encode(_dstChainId),
            _to
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Bridges tokens to a specified chain using the Axelar network.
     * @dev Encodes the transaction details and invokes the Axelar gateway for token bridging.
     * Ensures the sender has enough tokens and the necessary allowance, then burns the bridged tokens.
     * If Ether is sent, it covers the native gas fee for the Axelar contract call.
     * @param _destinationChain The identifier of the destination chain within the Axelar network.
     * @param _from The address sending the tokens on the source chain.
     * @param _to The intended recipient address on the destination chain.
     * @param _amount The number of tokens to be bridged.
     * @param _feeRefundAddress The address to which any excess Ether should be refunded.
     */
    function bridgeViaAxelar(
        string calldata _destinationChain,
        address _from,
        address _to,
        uint256 _amount,
        address payable _feeRefundAddress
    )
        public
        payable
        override
    {
        bytes memory payload = abi.encode(_from, _to, _amount);
        string memory _ALXAddress = addressThis;
        if (msg.value != 0) {
            GAS_SERVICE.payNativeGasForContractCall{value: msg.value} (
                address(this),
                _destinationChain,
                _ALXAddress,
                payload,
                _feeRefundAddress
            );
        }
        if (_from != msg.sender)
            _spendAllowance(
                _from,
                msg.sender,
                _amount
            );
        _burn(_from, _amount);
        if (_to == address(0)) {
            revert InvalidToAddress();
        }
        gateway.callContract(
            _destinationChain,
            _ALXAddress,
            payload
        );
        emit BridgeTransfer(
            _from,
            _amount,
            BridgeId.Axelar,
            abi.encode(_destinationChain),
            _to
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Bridges tokens to a specified chain using the Wormhole network.
     * @dev This function handles the bridging of tokens by first estimating the required gas fee for Wormhole,
     * checking if the provided Ether covers the cost, and then initiating the bridge process via the Wormhole relayer.
     * It ensures the sender has the necessary token allowance and burns the tokens to be bridged from the sender's address.
     * @param _targetChain The identifier of the destination chain within the Wormhole network.
     * @param _from The address initiating the token bridge on the source chain.
     * @param _to The intended recipient address on the target chain.
     * @param _amount The quantity of tokens to be bridged.
     * @param _feeRefundAddress The address to which any excess fees should be refunded.
     * @param _gasLimit The gas limit for processing the transaction on the destination chain.
     */
    function bridgeViaWormhole(
        uint16 _targetChain,
        address _from,
        address _to,
        uint256 _amount,
        address payable _feeRefundAddress,
        uint256 _gasLimit
    )
        public
        payable
        override
    {
        uint256 cost = estimateGasForWormhole(_targetChain, _gasLimit);
        if (msg.value < cost) {
            revert InsufficientFeeForWormhole();
        }
        if (msg.sender != _from)
            _spendAllowance(
                _from,
                msg.sender,
                _amount
            );
        _burn(_from, _amount);
        if (_to == address(0)) {
            revert InvalidToAddress();
        }
        WORMHOLE_RELAYER.sendPayloadToEvm{value: msg.value} (
            _targetChain,
            address(this),
            abi.encode(_from, _to, _amount),
            0,
            _gasLimit,
            _targetChain,
            _feeRefundAddress
        );
        emit BridgeTransfer(
            _from,
            _amount,
            BridgeId.Wormhole,
            abi.encode(_targetChain),
            _to
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Estimates the bridging fee on LayerZero for token transfer.
     * @dev Invokes the `estimateFees` function from LayerZero's endpoint contract to calculate the bridging cost.
     * @param _dstChainId The destination chain ID on LayerZero where the tokens will be bridged.
     * @param _from The address sending tokens on the source chain.
     * @param _to The address receiving tokens on the destination chain.
     * @param _amount The amount of tokens being bridged.
     * @param _payInZRO Indicates if the fee will be paid in ZRO token. If false, the fee is paid in the native chain token.
     * @param _adapterParam Adapter-specific parameters that may affect fee calculation.
     * @return nativeFee_ The estimated fee for the bridging operation in the native chain token.
     */
    function estimateGasForLayerZero(
        uint16 _dstChainId,
        address _from,
        address _to,
        uint256 _amount,
        bool _payInZRO,
        bytes calldata _adapterParam
    )
        public
        override
        view
        returns (uint256 nativeFee_)
    {
        (nativeFee_, ) = ENDPOINT.estimateFees(
            _dstChainId,
            address(this),
            abi.encode(_from, _to, _amount),
            _payInZRO,
            _adapterParam
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Estimates the bridging fee using the Wormhole network for a specific transaction.
     * @dev Calls the `quoteEVMDeliveryPrice` function on the Wormhole relayer contract to determine the fee based on the target chain and gas limit.
     * @param _targetChain The ID of the target chain within the Wormhole network where the assets or data will be sent.
     * @param _gasLimit The gas limit specified for the transaction on the destination chain, influencing the cost estimation.
     * @return cost_ The estimated cost for using Wormhole to bridge the transaction, denoted in the native token of the source chain.
     */
    function estimateGasForWormhole(
        uint16 _targetChain,
        uint256 _gasLimit
    )
        public
        override
        view
        returns (uint256 cost_)
    {
        (cost_, ) = WORMHOLE_RELAYER.quoteEVMDeliveryPrice(
            _targetChain,
            0,
            _gasLimit
        );
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Processes the minting of tokens based on a cross-chain transaction.
     * @dev Decodes the provided payload to extract minting details. It validates the source address and mints tokens to the specified recipient.
     * This function is internal and is typically called as part of the cross-chain communication logic, ensuring that the token minting
     * aligns with the protocol's cross-chain transaction rules.
     * @param _sourceChain Identifies the blockchain from which the cross-chain request originated.
     * @param _sourceAddress The address on the source chain that initiated the mint request. Must match this contract's address.
     * @param _payload Encoded data containing the details of the mint operation, including the recipient's address and the amount to mint.
     */
    function _execute(
        string calldata _sourceChain,
        string calldata _sourceAddress,
        bytes calldata _payload
    )
        internal
        override
    {
        if (_sourceAddress.toAddress() != address(this)) {
            revert InvalidSourceAddress();
        }
        (address _from, address _to, uint256 _amount) = abi.decode(
            _payload,
            (address, address, uint256)
        );
        _mint(_to, _amount);
        emit BridgeReceive(
            _to,
            _amount,
            BridgeId.Axelar,
            abi.encode(_sourceChain),
            _from
        );
    }

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IBurnableToken} from "./IBurnableToken.sol";
import {IBridgeToken} from "./IBridgeToken.sol";

/*
 * @title IALX Interface
 *
 * @notice Interface for the ALX token, incorporating ERC20, burnable, and bridgeable functionalities.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This interface aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this interface involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this interface, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this interface, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this interface. Any use beyond the scope defined herein may be subject to legal action.
 */
interface IALX is
    IBurnableToken,
    IBridgeToken,
    IERC20
{
    /// -------------------------------------- ERRORS --------------------------------------- \\\

    /**
     * @notice Error for attempting to mint tokens to the zero address.
     * @dev Ensures that token minting is only attempted to valid, non-zero addresses.
     */
    error ZeroAddress();

    /**
     * @notice Error for unauthorised caller.
     * @dev Prevents unauthorised access to functions and operations.
     */
    error InvalidCaller();

    /**
     * @notice Error when the Core address has already been set.
     * @dev Ensures the Core address can only be set once.
     */
    error CoreAlreadySet();

    /**
     * @notice Error when minting would exceed the max supply.
     * @dev Protects against exceeding the predefined maximum supply of ALX tokens.
     */
    error ExceedsMaxSupply();

    /**
     * @notice Error when the max supply cap has been reached.
     * @dev Ensures minting operations respect the maximum token supply limit.
     */
    error MaxSupplyExceeded();

    /**
     * @notice Error for invalid claim proof during airdrop claim.
     * @dev Validates the Merkle proof for airdrop claims.
     */
    error InvalidClaimProof();

    /**
     * @notice Error for unsupported interface.
     * @dev Ensures that only supported interfaces can interact with certain functions.
     */
    error UnsupportedInterface();

    /**
     * @notice Error when airdrop has already been claimed.
     * @dev Prevents double claiming of airdrops by users.
     */
    error AirdropAlreadyClaimed();

    /**
     * @notice Error when claiming airdrop outside of the active period.
     * @dev Ensures airdrop claims are made within the designated active period.
     */
    error AirdropPeriodNotActive();

    /// -------------------------------------- EVENTS --------------------------------------- \\\

    /**
     * @notice Emitted when a user successfully claims their airdrop.
     * @dev Logs the user address and the amount of airdrop claimed.
     * @param _user Address of the user claiming the airdrop.
     * @param _amount Amount of airdrop claimed.
     */
    event Airdropped(
        address indexed _user,
        uint256 _amount
    );

    /// --------------------------------- EXTERNAL FUNCTIONS -------------------------------- \\\

    /**
     * @notice Claims airdropped tokens using a Merkle proof.
     * @dev Verifies the claim against the Merkle root and mints the tokens.
     * @param _proof Array of bytes32 values representing the Merkle proof.
     * @param _airdroppedAmount Total airdropped amount.
     * @param _amountToClaim Amount of tokens being claimed.
     */
    function claim(
        bytes32[] calldata _proof,
        uint256 _airdroppedAmount,
        uint256 _amountToClaim
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Purchases bonds using airdropped ALX tokens from the first day.
     * @dev Verifies the user's airdropped tokens using a Merkle proof.
     * @param _proof Array of bytes32 values representing the Merkle proof.
     * @param _user Address of the user purchasing bonds.
     * @param _bondPower The power of the bond being purchased.
     * @param _bondCount The number of bonds to purchase.
     * @param _daysCount The duration of the bond in days.
     * @param _airdroppedAmount The total amount of airdropped tokens available.
     */
    function purchaseBondWithAirdroppedALX(
        bytes32[] calldata _proof,
        address _user,
        uint256 _bondPower,
        uint256 _bondCount,
        uint256 _daysCount,
        uint256 _airdroppedAmount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Stakes airdropped ALX tokens within the first 1 day of participation.
     * @dev Verifies the user's airdropped tokens using a Merkle proof.
     * @param _proof Array of bytes32 values representing the Merkle proof.
     * @param _user Address of the user staking tokens.
     * @param _duration The duration for which the tokens will be staked.
     * @param _amountToStake Amount of tokens being staked.
     * @param _airdroppedAmount The total amount of airdropped tokens available.
     */
    function stakeWithAirdroppedALX(
        bytes32[] calldata _proof,
        address _user,
        uint256 _duration,
        uint256 _amountToStake,
        uint256 _airdroppedAmount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Mints ALX tokens to a specified account.
     * @dev This function allows authorized entities to mint new ALX tokens to a given account.
     * @param _account The account to which the tokens will be minted.
     * @param _amount The amount of tokens to mint.
     */
    function mint(
        address _account,
        uint256 _amount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns ALX tokens from a specified user.
     * @dev This function allows the burning of ALX tokens from a user's account.
     * @param _user The user from whose account tokens will be burned.
     * @param _amount The amount of tokens to burn.
     */
    function burn(
        address _user,
        uint256 _amount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Sets the ALX-vXNF POL address.
     * @dev Can only be set once.
     * @param _ALXPOL The address of the ALX-vXNF POL contract.
     */
    function setPool(address _ALXPOL) external;

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

/*
 * @title ICore Interface
 *
 * @notice Defines the core functionalities of the Alixa protocol, allowing interaction with bond and staking mechanisms.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This interface aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this interface involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this interface, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this interface, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this interface. Any use beyond the scope defined herein may be subject to legal action.
 */
interface ICore {

    /// --------------------------------------- ENUM ---------------------------------------- \\\

    /**
     * @notice Enum representing the types of tokens in the Alixa ecosystem.
     * @dev The enum contains the supported tokens: eETH, ETHx, and ETH.
     */
    enum Token {
        eeth,
        ethx,
        eth
    }

    /// --------------------------------- EXTERNAL FUNCTIONS -------------------------------- \\\

    /**
     * @notice Triggers the provision of assets for liquidity.
     * @dev This function allows the provision of a specified amount of ALX tokens for liquidity purposes.
     * @param ALXAmount The amount of ALX tokens to provide for liquidity.
     */
    function provideAssetsForLiquidity(uint256 ALXAmount) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Checks if the liquidity provision has been triggered.
     * @dev This function checks the status of the liquidity provision trigger.
     * @return bool True if provision has been triggered, false otherwise.
     */
    function isTriggered()
        external
        view
        returns (bool);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Gets the base cost.
     * @dev Returns the fixed base cost for transactions within the protocol.
     * @return The base cost value.
     */
    function BASE_COST()
        external
        pure
        returns (uint256);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Calculates and updates the current cycle.
     * @dev This function is used to calculate the current cycle based on the protocol's parameters
     * and update the state accordingly.
     * @return The current cycle number.
     */
    function calculateCycle()
        external
        returns (uint256);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Gets the current cycle number.
     * @dev Returns the current cycle number without modifying the state.
     * @return The current cycle number.
     */
    function getCurrentCycle()
        external
        view
        returns (uint256);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Calculates the required token amounts for bond operations.
     * @dev Determines the amount of tokens needed based on bond power and count. Adjusts for ETH bond specifics.
     * @param _bondPower The power of the bond.
     * @param _bondCount The number of bonds.
     * @param _isETHBond Indicates if the bond is an ETH bond.
     * @return tokenRequired_ The required amount of tokens.
     */
     function getTokenAmounts(
        uint256 _bondPower,
        uint256 _bondCount,
        bool _isETHBond
    )
        external
        view
        returns (uint256 tokenRequired_);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Initiates the unbonding process for ALX tokens.
     * @dev This function initiates the process for unbonding ALX tokens associated with a specific bond ID.
     * @param _bondID The ID of the bond.
     * @param _restake Indicates if the rewards should be restaked.
     */
    function unbondingALX(
        uint256 _bondID,
        bool _restake
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Reactivating an existing bond.
     * @dev This function allows reactivating an existing bond with a specified amount of ETHx.
     * @param _bondID The ID of the bond.
     * @param _ETHxAmount The amount of ETHx to use in the reactivation.
     */
    function reactivate(
        uint256 _bondID,
        uint256 _ETHxAmount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Claims ETHx rewards for a bond.
     * @dev This function claims the ETHx rewards associated with a specific bond ID.
     * @param _bondID The ID of the bond.
     * @param _restake Indicates if the rewards should be restaked.
     */
    function claimETHxRewards(
        uint256 _bondID,
        bool _restake
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Gets the pending ALX rewards for a bond.
     * @dev This function returns the amount of pending ALX rewards for a specific bond ID.
     * @param _bondID The ID of the bond.
     * @return reward_ The amount of pending ALX rewards.
     */
    function pendingALX(uint256 _bondID)
        external
        view
        returns (uint256 reward_);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Checks if a bond exists.
     * @dev This function checks if a bond exists for a specific user and bond ID.
     * @param _user The address of the user.
     * @param _bondID The ID of the bond.
     * @return exists_ True if the bond exists, false otherwise.
     */
    function isExist(
        address _user,
        uint256 _bondID
    )
        external
        view
        returns (bool exists_);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Transfers a bond to a new owner.
     * @dev This function transfers the ownership of specified bonds to a new recipient.
     * @param _bondIDs The IDs of the bonds to transfer.
     * @param _recipient The recipient of the bond transfer.
     * @param _restake Indicates if the rewards should be restaked.
     */
    function transferBond(
        uint256[] calldata _bondIDs,
        address _recipient,
        bool _restake
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Allows a user to snipe a bond.
     * @dev This function allows a user to snipe a bond by providing the bond IDs of the user and the sniper.
     * @param _user The address of the bond owner.
     * @param _bondIDUser The ID of the bond to snipe.
     * @param _bondIDSniper The ID of the sniper's bond.
     * @param _restake Indicates if the rewards should be restaked.
     */
    function snipe(
        address _user,
        uint256 _bondIDUser,
        uint256 _bondIDSniper,
        bool _restake
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Calculates pending ETHx rewards for a bond.
     * @dev This function calculates the pending ETHx rewards for a specific bond ID.
     * @param _user The address of the user.
     * @param _bondID The ID of the bond.
     * @return pendingAmount_ The pending amount of ETHx rewards.
     * @return pendingBonus_ The pending bonus amount.
     * @return totalPending_ The total pending rewards.
     */
    function pendingETHx(
        address _user,
        uint256 _bondID
    )
        external
        view
        returns (
            uint256 pendingAmount_,
            uint256 pendingBonus_,
            uint256 totalPending_
        );

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Allows a user to purchase a bond with ALX.
     * @dev This function allows a user to purchase a bond using ALX tokens.
     * @param _user The address of the user.
     * @param _bondCount The number of bonds to purchase.
     * @param _daysCount The number of days for the bond.
     * @param _bondPower The power of the bond.
     */
    function purchaseALXBond(
        address _user,
        uint256 _bondCount,
        uint256 _daysCount,
        uint256 _bondPower
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Purchase a bond with ALX tokens that are airdropped.
     * @dev Allows users to purchase bonds using their airdropped ALX tokens.
     * @param _user Address of the user purchasing the bond.
     * @param _bondCount Number of bonds to purchase.
     * @param _daysCount Number of days until bond maturity.
     * @param _bondPower The power rating of the bond.
     * @param _requiredALXAmount The amount of ALX that is needed to purchase a bond.
     */
    function purchaseBondWithAirdroppedALX(
        address _user,
        uint256 _bondCount,
        uint256 _daysCount,
        uint256 _bondPower,
        uint256 _requiredALXAmount
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Allows a user to purchase an ETH bond.
     * @dev This function allows a user to purchase a bond using ETH or ETH-based tokens.
     * @param _user The address of the user.
     * @param _bondCount The number of bonds to purchase.
     * @param _token The type of token used for the purchase.
     * @param _daysCount The number of days for the bond.
     * @param _bondPower The power of the bond.
     */
    function purchaseETHBond(
        address _user,
        uint256 _bondCount,
        Token _token,
        uint256 _daysCount,
        uint256 _bondPower
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

import {IERC20} from  "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IBurnableToken} from  "./IBurnableToken.sol";
import {IBridgeToken} from  "./IBridgeToken.sol";

/*
 * @title vXNF Contract
 *
 * @notice This interface outlines functions for the vXNF token, an ERC20 token with bridging and burning capabilities.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/xenify_io
 * - Telegram: https://t.me/xenify_io
 * - Website: https://xenify.io
 *
 * Disclaimer:
 * This contract aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralization.
 * Engaging with this contract involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this contract, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this contract, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2023 Xenify (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this contract. Any use beyond the scope defined herein may be subject to legal action.
 */
interface IvXNF is
    IBurnableToken,
    IBridgeToken,
    IERC20
{
    /// -------------------------------------- ERRORS --------------------------------------- \\\

    /**
     * @notice This error is thrown when only the team is allowed to call a function.
     */
    error OnlyTeamAllowed();

    /**
     * @notice This error is thrown when XNF address is already set.
     */
    error XNFIsAlreadySet();

    /// -------------------------------------- EVENTS --------------------------------------- \\\

    /**
     * @notice Emitted when vXNF tokens are bridged to another chain.
     * @param _from Address on the source chain that initiated the bridge.
     * @param _burnedAmount Amount of vXNF tokens burned for the bridge.
     * @param _bridgeId Identifier for the bridge used
     * @param _outgoingChainId ID of the destination chain.
     * @param _to Address on the destination chain to receive the tokens.
     */
    event vXNFBridgeTransfer(
        address indexed _from,
        uint256 _burnedAmount,
        BridgeId indexed _bridgeId,
        bytes _outgoingChainId,
        address indexed _to
    );

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Emitted when vXNF tokens are received from a bridge.
     * @param _to Address that receives the minted vXNF tokens.
     * @param _mintAmount Amount of vXNF tokens minted.
     * @param _bridgeId Identifier for the bridge used
     * @param _incomingChainId ID of the source chain.
     * @param _from Address on the source chain that initiated the bridge.
     */
    event vXNFBridgeReceive(
        address indexed _to,
        uint256 _mintAmount,
        BridgeId indexed _bridgeId,
        bytes _incomingChainId,
        address indexed _from
    );

    /// --------------------------------- EXTERNAL FUNCTIONS -------------------------------- \\\

    /**
     * @notice Sets the XNF contract address.
     * @dev This function is called by the team to set XNF contract address.
     * Function can be called only once.
     * @param _XNF The XNF contract address.
     * @param _ratio The ratio between vXNF and XNF used for minting and burning.
     */
    function setXNFAndRatio(
        address _XNF,
        uint256 _ratio
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns the specified amount of XNF tokens and mints an equivalent amount of vXNF tokens.
     * @param _amount Amount of XNF tokens to burn.
     */
    function burnXNF(uint256 _amount) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns the specified amount of XNF tokens and bridges them via the LayerZero network.
     * @dev Burns the XNF tokens from the sender's address and then initiates a bridge operation using the LayerZero network.
     * @param _amount The amount of XNF tokens to burn and bridge.
     * @param _dstChainId The Chain ID of the destination chain on the LayerZero network.
     * @param _to The recipient address on the destination chain.
     * @param _feeRefundAddress Address to refund any excess fees.
     * @param _zroPaymentAddress Address of the ZRO token holder who would pay for the transaction.
     * @param _adapterParams Parameters for custom functionality, e.g., receiving airdropped native gas from the relayer on the destination.
     */
    function burnAndBridgeViaLayerZero(
        uint256 _amount,
        uint16 _dstChainId,
        address _to,
        address payable _feeRefundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns the specified amount of XNF tokens and bridges them via the Axelar network.
     * @dev Burns the XNF tokens from the sender's address and then initiates a bridge operation using the Axelar network.
     * @param _amount The amount of XNF tokens to burn and bridge.
     * @param _dstChainId The target chain where tokens should be bridged to on the Axelar network.
     * @param _to The recipient address on the destination chain.
     * @param _feeRefundAddress Address to refund any excess fees.
     */
    function burnAndBridgeViaAxelar(
        uint256 _amount,
        string calldata _dstChainId,
        address _to,
        address payable _feeRefundAddress
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns the specified amount of XNF tokens and bridges them via the Wormhole network.
     * @dev Burns the XNF tokens from the sender's address and then initiates a bridge operation using the Wormhole network.
     * @param _amount The amount of XNF tokens to burn and bridge.
     * @param _targetChain The ID of the target chain on the Wormhole network.
     * @param _to The recipient address on the destination chain.
     * @param _feeRefundAddress Address to refund any excess fees.
     * @param _gasLimit The gas limit for the transaction on the destination chain.
     */
    function burnAndBridgeViaWormhole(
        uint256 _amount,
        uint16 _targetChain,
        address _to,
        address payable _feeRefundAddress,
        uint256 _gasLimit
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Burns a specific amount of vXNF tokens from a user's address.
     * @dev Allows an external entity to burn tokens from a user's address, provided they have the necessary allowance.
     * @param _user The address from which the vXNF tokens will be burned.
     * @param _amount The amount of vXNF tokens to burn.
     */
    function burn(
        address _user,
        uint256 _amount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

/*
 * @title IBridge Interface
 *
 * @notice Interface defining the functions and events for token bridging operations.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This interface aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this interface involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this interface, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this interface, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this interface. Any use beyond the scope defined herein may be subject to legal action.
 */
interface IBridgeToken {

    /// --------------------------------------- ENUM ---------------------------------------- \\\

    /**
     * @notice Enumerates the types of bridges supported.
     * @dev Defines the different bridge protocols that can be used for cross-chain operations.
     */
    enum BridgeId {
        LayerZero,
        Wormhole,
        Axelar
    }

    /// -------------------------------------- EVENTS --------------------------------------- \\\

    /**
     * @notice Emitted when tokens are received through a bridge.
     * @dev Logs the receipt of tokens bridged from another chain.
     * @param to Recipient address.
     * @param amount Amount of tokens received.
     * @param bridgeId Identifier of the bridge used.
     * @param fromChainId Identifier of the source chain.
     * @param from Sender address on the source chain.
     */
    event BridgeReceive(
        address indexed to,
        uint256 amount,
        BridgeId bridgeId,
        bytes fromChainId,
        address indexed from
    );

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Emitted when tokens are sent to another chain via a bridge.
     * @dev Logs the transfer of tokens to another chain.
     * @param from Sender address.
     * @param amount Amount of tokens transferred.
     * @param bridgeId Bridge used for the transfer.
     * @param toChainId Destination chain identifier.
     * @param to Recipient address on the destination chain.
     */
    event BridgeTransfer(
        address indexed from,
        uint256 amount,
        BridgeId bridgeId,
        bytes toChainId,
        address indexed to
    );

    /// -------------------------------------- ERRORS --------------------------------------- \\\

    /**
     * @notice Error for when the provided fee is insufficient.
     * @dev Ensures the user provides enough fee for the bridging operation.
     */
    error InsufficientFee();

    /**
     * @notice Error for when the recipient address is invalid.
     * @dev Validates the recipient address in bridging operations.
     */
    error InvalidToAddress();

    /**
     * @notice Error for when a non-verified caller attempts an operation.
     * @dev Prevents unauthorised access to bridge functions.
     */
    error NotVerifiedCaller();

    /**
     * @notice Error indicating that the operation is restricted to the relayer.
     * @dev Ensures only the designated relayer can perform certain operations.
     */
    error OnlyRelayerAllowed();

    /**
     * @notice Error for when the source address is invalid.
     * @dev Validates the source address in bridging operations.
     */
    error InvalidSourceAddress();

    /**
     * @notice Error for when the fee for Wormhole bridging is insufficient.
     * @dev Ensures the user provides enough fee for the Wormhole bridging operation.
     */
    error InsufficientFeeForWormhole();

    /**
     * @notice Error for when the Wormhole source address is invalid.
     * @dev Validates the source address in Wormhole bridging operations.
     */
    error InvalidWormholeSourceAddress();

    /**
     * @notice Error for when the LayerZero source address is invalid.
     * @dev Validates the source address in LayerZero bridging operations.
     */
    error InvalidLayerZeroSourceAddress();

    /**
     * @notice Error for when a Wormhole message is replayed.
     * @dev Prevents replay attacks in Wormhole bridging operations.
     */
    error WormholeMessageAlreadyProcessed();

    /// --------------------------------- EXTERNAL FUNCTIONS -------------------------------- \\\

    /**
     * @notice Receives tokens via LayerZero.
     * @dev Handles incoming tokens from LayerZero bridging operations.
     * @param _srcChainId The Chain ID of the source chain on the LayerZero network.
     * @param _srcAddress The address on the source chain from which the ALX tokens were sent.
     * @param _payload The encoded data containing details about the bridging operation, including the recipient address and amount.
     */
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64,
        bytes memory _payload
    ) external;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Receives tokens via Wormhole.
     * @dev Handles incoming tokens from Wormhole bridging operations.
     * @param _payload The encoded data containing user address and amount.
     * @param _sourceAddress The address of the caller on the source chain in bytes32.
     * @param _srcChainId The chain ID of the source chain from which the tokens are being bridged.
     * @param _deliveryHash The hash which is used to verify relay calls.
     */
    function receiveWormholeMessages(
        bytes memory _payload,
        bytes[] memory,
        bytes32 _sourceAddress,
        uint16 _srcChainId,
        bytes32 _deliveryHash
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Bridges tokens to another chain via LayerZero.
     * @dev Facilitates token transfer to another chain using LayerZero bridging.
     * @param _dstChainId ID of the target chain on LayerZero.
     * @param _from Sender's address on the source chain.
     * @param _to Recipient's address on the destination chain.
     * @param _amount Amount of tokens to bridge.
     * @param _feeRefundAddress Address for any excess fee refunds.
     * @param _zroPaymentAddress Address of the ZRO token holder covering transaction fees.
     * @param _adapterParams Additional parameters for custom functionalities.
     */
    function bridgeViaLayerZero(
        uint16 _dstChainId,
        address _from,
        address _to,
        uint256 _amount,
        address payable _feeRefundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Bridges tokens to another chain via Axelar.
     * @dev Facilitates token transfer to another chain using Axelar bridging.
     * @param _destinationChain ID of the target chain on Axelar.
     * @param _from Sender's address on the source chain.
     * @param _to Recipient's address on the destination chain.
     * @param _amount Amount of tokens to bridge.
     * @param _feeRefundAddress Address for any excess fee refunds.
     */
    function bridgeViaAxelar(
        string calldata _destinationChain,
        address _from,
        address _to,
        uint256 _amount,
        address payable _feeRefundAddress
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Bridges tokens to another chain via Wormhole.
     * @dev Facilitates token transfer to another chain using Wormhole bridging.
     * @param _targetChain ID of the target chain on Wormhole.
     * @param _from Sender's address on the source chain.
     * @param _to Recipient's address on the destination chain.
     * @param _amount Amount of tokens to bridge.
     * @param _feeRefundAddress Address for any excess fee refunds.
     * @param _gasLimit Gas limit for the transaction on the destination chain.
     */
    function bridgeViaWormhole(
        uint16 _targetChain,
        address _from,
        address _to,
        uint256 _amount,
        address payable _feeRefundAddress,
        uint256 _gasLimit
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Estimates the gas required for LayerZero bridging.
     * @dev Provides an estimate of the gas fee needed for LayerZero bridging operations.
     * @param _dstChainId ID of the destination chain on LayerZero.
     * @param _from Sender's address on the source chain.
     * @param _to Recipient's address on the destination chain.
     * @param _amount Amount of tokens to bridge.
     * @param _payInZRO If false, user pays the fee in native token.
     * @param _adapterParam Parameters for adapter services.
     * @return nativeFee_ Estimated fee in native tokens.
     */
    function estimateGasForLayerZero(
        uint16 _dstChainId,
        address _from,
        address _to,
        uint256 _amount,
        bool _payInZRO,
        bytes calldata _adapterParam
    )
        external
        view
        returns (uint256 nativeFee_);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Estimates the gas required for Wormhole bridging.
     * @dev Provides an estimate of the gas fee needed for Wormhole bridging operations.
     * @param _targetChain ID of the destination chain on Wormhole.
     * @param _gasLimit Gas limit for the transaction on the destination chain.
     * @return cost_ Estimated fee for the operation.
     */
    function estimateGasForWormhole(
        uint16 _targetChain,
        uint256 _gasLimit
    )
        external
        view
        returns (uint256 cost_);

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

/*
 * @title IBurnableToken Interface
 *
 * @notice Defines the functionality for tokens that can be burned, reducing the total supply irreversibly.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This interface aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this interface involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this interface, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this interface, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this interface. Any use beyond the scope defined herein may be subject to legal action.
 */
interface IBurnableToken {

    /// --------------------------------- EXTERNAL FUNCTION --------------------------------- \\\

    /**
     * @notice Burns a specific amount of tokens from a user's account.
     * @dev Reduces the total supply by destroying the specified amount of tokens from the user's balance.
     * Ensures the user has sufficient balance and emits a Transfer event to the zero address.
     * @param _user The address from which the tokens will be burned.
     * @param _amount The number of tokens to be burned.
     */
    function burn(
        address _user,
        uint256 _amount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

/*
 * @title IBurnRedeemable Interface
 *
 * @notice Interface for tokens with redeemable features upon burning.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This interface aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this interface involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this interface, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this interface, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this interface. Any use beyond the scope defined herein may be subject to legal action.
 */
interface IBurnRedeemable {

    /// --------------------------------- EXTERNAL FUNCTION --------------------------------- \\\

    /**
     * @notice Triggered when a user burns tokens.
     * @dev This function should include any additional logic that needs to occur when tokens are burned, such as redemption processes.
     * Implementers should guard against reentrancy attacks where necessary.
     * @param _user The address of the user who is burning the tokens.
     * @param _amount The amount of tokens being burned.
     */
    function onTokenBurned(
        address _user,
        uint256 _amount
    ) external;

    /// ------------------------------------------------------------------------------------- \\\
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.25;

/*
 * @title IWormholeRelayerBase Interface
 *
 * @notice Defines the base interface for the Wormhole Relayer, facilitating cross-chain communication and message relaying.
 *
 * Co-Founders:
 * - Simran Dhillon: [email protected]
 * - Hardev Dhillon: [email protected]
 * - Dayana Plaz: [email protected]
 *
 * Official Links:
 * - Twitter: https://twitter.com/alixa_io
 * - Telegram: https://t.me/alixa_io
 * - Website: https://alixa.io
 *
 * Disclaimer:
 * This interface aligns with the principles of the Fair Crypto Foundation, promoting self-custody, transparency, consensus-based
 * trust, and permissionless value exchange. There are no administrative access keys, underscoring our commitment to decentralisation.
 * Engaging with this interface involves technical and legal risks. Users must conduct their own due diligence and ensure compliance
 * with local laws and regulations. The software is provided "AS-IS," without warranties, and the co-founders and developers disclaim
 * all liability for any vulnerabilities, exploits, errors, or breaches that may occur. By using this interface, users accept all associated
 * risks and this disclaimer. The co-founders, developers, or related parties will not bear liability for any consequences of non-compliance.
 *
 * Redistribution and Use:
 * Redistribution, modification, or repurposing of this interface, in whole or in part, is strictly prohibited without express written
 * approval from all co-founders. Approval requests must be sent to the official email addresses of the co-founders, ensuring responses
 * are received directly from these addresses. Proposals for redistribution, modification, or repurposing must include a detailed explanation
 * of the intended changes or uses and the reasons behind them. The co-founders reserve the right to request additional information or
 * clarification as necessary. Approval is at the sole discretion of the co-founders and may be subject to conditions to uphold the
 * project’s integrity and the values of the Fair Crypto Foundation. Failure to obtain express written approval prior to any redistribution,
 * modification, or repurposing will result in a breach of these terms and immediate legal action.
 *
 * Copyright and License:
 * Copyright © 2024 Alixa (Simran Dhillon, Hardev Dhillon, Dayana Plaz). All rights reserved.
 * This software is provided 'as is' and may be used by the recipient. No permission is granted for redistribution,
 * modification, or repurposing of this interface. Any use beyond the scope defined herein may be subject to legal action.
 */

/// ------------------------------------- STRUCTURE ------------------------------------- \\\

/**
 * @notice VaaKey identifies a wormhole message.
 * @custom:member chainId Wormhole chain ID of the chain where this VAA was emitted from.
 * @custom:member emitterAddress Address of the emitter of the VAA, in Wormhole bytes32 format.
 * @custom:member sequence Sequence number of the VAA.
 */
struct VaaKey {
    uint16 chainId;
    bytes32 emitterAddress;
    uint64 sequence;
}

/// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| \\\

/**
 * @title IWormholeRelayerBase
 * @notice Interface for basic Wormhole Relayer operations.
 */
interface IWormholeRelayerBase {

    /// -------------------------------------- EVENT ---------------------------------------- \\\

    /**
     * @notice Emitted when a Send operation is executed.
     * @param sequence The sequence of the send event.
     * @param deliveryQuote The delivery quote for the send operation.
     * @param paymentForExtraReceiverValue The payment value for the additional receiver.
     */
    event SendEvent(
        uint64 indexed sequence,
        uint256 deliveryQuote,
        uint256 paymentForExtraReceiverValue
    );

    /// --------------------------------- EXTERNAL FUNCTION --------------------------------- \\\

    /**
     * @notice Fetches the registered Wormhole Relayer contract for a given chain ID.
     * @param chainId The chain ID to fetch the relayer contract for.
     * @return The address of the registered Wormhole Relayer contract for the given chain ID.
     */
    function getRegisteredWormholeRelayerContract(uint16 chainId)
        external
        view returns (bytes32);

    /// ------------------------------------------------------------------------------------- \\\
}

/// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| \\\

/**
 * @title IWormholeRelayerSend
 * @notice The interface to request deliveries.
 */
interface IWormholeRelayerSend is IWormholeRelayerBase {

    /// --------------------------------- EXTERNAL FUNCTIONS -------------------------------- \\\

    /**
     * @notice Publishes an instruction for the default delivery provider
     * to relay a payload to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and `msg.value` equal to `receiverValue`
     *
     * `targetAddress` must implement the IWormholeReceiver interface.
     *
     * This function must be called with `msg.value` equal to `quoteEVMDeliveryPrice(targetChain, receiverValue, gasLimit)`.
     *
     * Any refunds (from leftover gas) will be paid to the delivery provider. In order to receive the refunds, use the `sendPayloadToEvm` function
     * with `refundChain` and `refundAddress` as parameters.
     *
     * @param targetChain in Wormhole Chain ID format.
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver).
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`.
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units).
     * @param gasLimit gas limit with which to call `targetAddress`.
     * @return sequence sequence number of published VAA containing delivery instructions.
     */
    function sendPayloadToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 gasLimit
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Publishes an instruction for the default delivery provider.
     * to relay a payload to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and `msg.value` equal to `receiverValue`.
     *
     * Any refunds (from leftover gas) will be sent to `refundAddress` on chain `refundChain`
     * `targetAddress` must implement the IWormholeReceiver interface.
     *
     * This function must be called with `msg.value` equal to `quoteEVMDeliveryPrice(targetChain, receiverValue, gasLimit)`.
     *
     * @param targetChain in Wormhole Chain ID format.
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver).
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`.
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units).
     * @param gasLimit gas limit with which to call `targetAddress`. Any units of gas unused will be refunded according to the
     *        `targetChainRefundPerGasUnused` rate quoted by the delivery provider.
     * @param refundChain The chain to deliver any refund to, in Wormhole Chain ID format.
     * @param refundAddress The address on `refundChain` to deliver any refund to.
     * @return sequence sequence number of published VAA containing delivery instructions.
     */
    function sendPayloadToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 gasLimit,
        uint16 refundChain,
        address refundAddress
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Publishes an instruction for the default delivery provider
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and `msg.value` equal to `receiverValue`
     *
     * `targetAddress` must implement the IWormholeReceiver interface
     *
     * This function must be called with `msg.value` equal to `quoteEVMDeliveryPrice(targetChain, receiverValue, gasLimit)`
     *
     * Any refunds (from leftover gas) will be paid to the delivery provider. In order to receive the refunds, use the `sendVaasToEvm` function
     * with `refundChain` and `refundAddress` as parameters
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver)
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param gasLimit gas limit with which to call `targetAddress`.
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     * @return sequence sequence number of published VAA containing delivery instructions
     */
    function sendVaasToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 gasLimit,
        VaaKey[] memory vaaKeys
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Publishes an instruction for the default delivery provider
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and `msg.value` equal to `receiverValue`
     *
     * Any refunds (from leftover gas) will be sent to `refundAddress` on chain `refundChain`
     * `targetAddress` must implement the IWormholeReceiver interface
     *
     * This function must be called with `msg.value` equal to `quoteEVMDeliveryPrice(targetChain, receiverValue, gasLimit)`
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver)
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param gasLimit gas limit with which to call `targetAddress`. Any units of gas unused will be refunded according to the
     *        `targetChainRefundPerGasUnused` rate quoted by the delivery provider
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     * @param refundChain The chain to deliver any refund to, in Wormhole Chain ID format
     * @param refundAddress The address on `refundChain` to deliver any refund to
     * @return sequence sequence number of published VAA containing delivery instructions
     */
    function sendVaasToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 gasLimit,
        VaaKey[] memory vaaKeys,
        uint16 refundChain,
        address refundAddress
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Publishes an instruction for the delivery provider at `deliveryProviderAddress`
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and `msg.value` equal to
     * receiverValue + (arbitrary amount that is paid for by paymentForExtraReceiverValue of this chain's wei) in targetChain wei.
     *
     * Any refunds (from leftover gas) will be sent to `refundAddress` on chain `refundChain`
     * `targetAddress` must implement the IWormholeReceiver interface
     *
     * This function must be called with `msg.value` equal to
     * quoteEVMDeliveryPrice(targetChain, receiverValue, gasLimit, deliveryProviderAddress) + paymentForExtraReceiverValue
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver)
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param paymentForExtraReceiverValue amount (in current chain currency units) to spend on extra receiverValue
     *        (in addition to the `receiverValue` specified)
     * @param gasLimit gas limit with which to call `targetAddress`. Any units of gas unused will be refunded according to the
     *        `targetChainRefundPerGasUnused` rate quoted by the delivery provider
     * @param refundChain The chain to deliver any refund to, in Wormhole Chain ID format
     * @param refundAddress The address on `refundChain` to deliver any refund to
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     * @param consistencyLevel Consistency level with which to publish the delivery instructions - see
     *        https://book.wormhole.com/wormhole/3_coreLayerContracts.html?highlight=consistency#consistency-levels
     * @return sequence sequence number of published VAA containing delivery instructions
     */
    function sendToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 paymentForExtraReceiverValue,
        uint256 gasLimit,
        uint16 refundChain,
        address refundAddress,
        address deliveryProviderAddress,
        VaaKey[] memory vaaKeys,
        uint8 consistencyLevel
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Publishes an instruction for the delivery provider at `deliveryProviderAddress`
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with `msg.value` equal to
     * receiverValue + (arbitrary amount that is paid for by paymentForExtraReceiverValue of this chain's wei) in targetChain wei.
     *
     * Any refunds (from leftover gas) will be sent to `refundAddress` on chain `refundChain`
     * `targetAddress` must implement the IWormholeReceiver interface
     *
     * This function must be called with `msg.value` equal to
     * quoteDeliveryPrice(targetChain, receiverValue, encodedExecutionParameters, deliveryProviderAddress) + paymentForExtraReceiverValue
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver), in Wormhole bytes32 format
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param paymentForExtraReceiverValue amount (in current chain currency units) to spend on extra receiverValue
     *        (in addition to the `receiverValue` specified)
     * @param encodedExecutionParameters encoded information on how to execute delivery that may impact pricing
     *        e.g. for version EVM_V1, this is a struct that encodes the `gasLimit` with which to call `targetAddress`
     * @param refundChain The chain to deliver any refund to, in Wormhole Chain ID format
     * @param refundAddress The address on `refundChain` to deliver any refund to, in Wormhole bytes32 format
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     * @param consistencyLevel Consistency level with which to publish the delivery instructions - see
     *        https://book.wormhole.com/wormhole/3_coreLayerContracts.html?highlight=consistency#consistency-levels
     * @return sequence sequence number of published VAA containing delivery instructions
     */
    function send(
        uint16 targetChain,
        bytes32 targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 paymentForExtraReceiverValue,
        bytes memory encodedExecutionParameters,
        uint16 refundChain,
        bytes32 refundAddress,
        address deliveryProviderAddress,
        VaaKey[] memory vaaKeys,
        uint8 consistencyLevel
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Performs the same function as a `send`, except:
     * 1)  Can only be used during a delivery (i.e. in execution of `receiveWormholeMessages`)
     * 2)  Is paid for (along with any other calls to forward) by (any msg.value passed in) + (refund leftover from current delivery)
     * 3)  Only executes after `receiveWormholeMessages` is completed (and thus does not return a sequence number)
     *
     * The refund from the delivery currently in progress will not be sent to the user; it will instead
     * be paid to the delivery provider to perform the instruction specified here
     *
     * Publishes an instruction for the same delivery provider (or default, if the same one doesn't support the new target chain)
     * to relay a payload to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and with `msg.value` equal to `receiverValue`
     *
     * The following equation must be satisfied (sum_f indicates summing over all forwards requested in `receiveWormholeMessages`):
     * (refund amount from current execution of receiveWormholeMessages) + sum_f [msg.value_f]
     * >= sum_f [quoteEVMDeliveryPrice(targetChain_f, receiverValue_f, gasLimit_f)]
     *
     * The difference between the two sides of the above inequality will be added to `paymentForExtraReceiverValue` of the first forward requested
     *
     * Any refunds (from leftover gas) from this forward will be paid to the same refundChain and refundAddress specified for the current delivery.
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver), in Wormhole bytes32 format
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param gasLimit gas limit with which to call `targetAddress`.
     */
    function forwardPayloadToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 gasLimit
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Performs the same function as a `send`, except:
     * 1)  Can only be used during a delivery (i.e. in execution of `receiveWormholeMessages`)
     * 2)  Is paid for (along with any other calls to forward) by (any msg.value passed in) + (refund leftover from current delivery)
     * 3)  Only executes after `receiveWormholeMessages` is completed (and thus does not return a sequence number)
     *
     * The refund from the delivery currently in progress will not be sent to the user; it will instead
     * be paid to the delivery provider to perform the instruction specified here
     *
     * Publishes an instruction for the same delivery provider (or default, if the same one doesn't support the new target chain)
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and with `msg.value` equal to `receiverValue`
     *
     * The following equation must be satisfied (sum_f indicates summing over all forwards requested in `receiveWormholeMessages`):
     * (refund amount from current execution of receiveWormholeMessages) + sum_f [msg.value_f]
     * >= sum_f [quoteEVMDeliveryPrice(targetChain_f, receiverValue_f, gasLimit_f)]
     *
     * The difference between the two sides of the above inequality will be added to `paymentForExtraReceiverValue` of the first forward requested
     *
     * Any refunds (from leftover gas) from this forward will be paid to the same refundChain and refundAddress specified for the current delivery.
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver), in Wormhole bytes32 format
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param gasLimit gas limit with which to call `targetAddress`.
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     */
    function forwardVaasToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 gasLimit,
        VaaKey[] memory vaaKeys
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Performs the same function as a `send`, except:
     * 1)  Can only be used during a delivery (i.e. in execution of `receiveWormholeMessages`)
     * 2)  Is paid for (along with any other calls to forward) by (any msg.value passed in) + (refund leftover from current delivery)
     * 3)  Only executes after `receiveWormholeMessages` is completed (and thus does not return a sequence number)
     *
     * The refund from the delivery currently in progress will not be sent to the user; it will instead
     * be paid to the delivery provider to perform the instruction specified here
     *
     * Publishes an instruction for the delivery provider at `deliveryProviderAddress`
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with gas limit `gasLimit` and with `msg.value` equal to
     * receiverValue + (arbitrary amount that is paid for by paymentForExtraReceiverValue of this chain's wei) in targetChain wei.
     *
     * Any refunds (from leftover gas) will be sent to `refundAddress` on chain `refundChain`
     * `targetAddress` must implement the IWormholeReceiver interface
     *
     * The following equation must be satisfied (sum_f indicates summing over all forwards requested in `receiveWormholeMessages`):
     * (refund amount from current execution of receiveWormholeMessages) + sum_f [msg.value_f]
     * >= sum_f [quoteEVMDeliveryPrice(targetChain_f, receiverValue_f, gasLimit_f, deliveryProviderAddress_f) + paymentForExtraReceiverValue_f]
     *
     * The difference between the two sides of the above inequality will be added to `paymentForExtraReceiverValue` of the first forward requested
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver), in Wormhole bytes32 format
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param paymentForExtraReceiverValue amount (in current chain currency units) to spend on extra receiverValue
     *        (in addition to the `receiverValue` specified)
     * @param gasLimit gas limit with which to call `targetAddress`. Any units of gas unused will be refunded according to the
     *        `targetChainRefundPerGasUnused` rate quoted by the delivery provider
     * @param refundChain The chain to deliver any refund to, in Wormhole Chain ID format
     * @param refundAddress The address on `refundChain` to deliver any refund to, in Wormhole bytes32 format
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     * @param consistencyLevel Consistency level with which to publish the delivery instructions - see
     *        https://book.wormhole.com/wormhole/3_coreLayerContracts.html?highlight=consistency#consistency-levels
     */
    function forwardToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 paymentForExtraReceiverValue,
        uint256 gasLimit,
        uint16 refundChain,
        address refundAddress,
        address deliveryProviderAddress,
        VaaKey[] memory vaaKeys,
        uint8 consistencyLevel
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Performs the same function as a `send`, except:
     * 1)  Can only be used during a delivery (i.e. in execution of `receiveWormholeMessages`)
     * 2)  Is paid for (along with any other calls to forward) by (any msg.value passed in) + (refund leftover from current delivery)
     * 3)  Only executes after `receiveWormholeMessages` is completed (and thus does not return a sequence number)
     *
     * The refund from the delivery currently in progress will not be sent to the user; it will instead
     * be paid to the delivery provider to perform the instruction specified here
     *
     * Publishes an instruction for the delivery provider at `deliveryProviderAddress`
     * to relay a payload and VAAs specified by `vaaKeys` to the address `targetAddress` on chain `targetChain`
     * with `msg.value` equal to
     * receiverValue + (arbitrary amount that is paid for by paymentForExtraReceiverValue of this chain's wei) in targetChain wei.
     *
     * Any refunds (from leftover gas) will be sent to `refundAddress` on chain `refundChain`
     * `targetAddress` must implement the IWormholeReceiver interface
     *
     * The following equation must be satisfied (sum_f indicates summing over all forwards requested in `receiveWormholeMessages`):
     * (refund amount from current execution of receiveWormholeMessages) + sum_f [msg.value_f]
     * >= sum_f [quoteDeliveryPrice(targetChain_f, receiverValue_f, encodedExecutionParameters_f, deliveryProviderAddress_f) + paymentForExtraReceiverValue_f]
     *
     * The difference between the two sides of the above inequality will be added to `paymentForExtraReceiverValue` of the first forward requested
     *
     * @param targetChain in Wormhole Chain ID format
     * @param targetAddress address to call on targetChain (that implements IWormholeReceiver), in Wormhole bytes32 format
     * @param payload arbitrary bytes to pass in as parameter in call to `targetAddress`
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param paymentForExtraReceiverValue amount (in current chain currency units) to spend on extra receiverValue
     *        (in addition to the `receiverValue` specified)
     * @param encodedExecutionParameters encoded information on how to execute delivery that may impact pricing
     *        e.g. for version EVM_V1, this is a struct that encodes the `gasLimit` with which to call `targetAddress`
     * @param refundChain The chain to deliver any refund to, in Wormhole Chain ID format
     * @param refundAddress The address on `refundChain` to deliver any refund to, in Wormhole bytes32 format
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @param vaaKeys Additional VAAs to pass in as parameter in call to `targetAddress`
     * @param consistencyLevel Consistency level with which to publish the delivery instructions - see
     *        https://book.wormhole.com/wormhole/3_coreLayerContracts.html?highlight=consistency#consistency-levels
     */
    function forward(
        uint16 targetChain,
        bytes32 targetAddress,
        bytes memory payload,
        uint256 receiverValue,
        uint256 paymentForExtraReceiverValue,
        bytes memory encodedExecutionParameters,
        uint16 refundChain,
        bytes32 refundAddress,
        address deliveryProviderAddress,
        VaaKey[] memory vaaKeys,
        uint8 consistencyLevel
    )
        external
        payable;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Requests a previously published delivery instruction to be redelivered
     * (e.g. with a different delivery provider)
     *
     * This function must be called with `msg.value` equal to
     * quoteEVMDeliveryPrice(targetChain, newReceiverValue, newGasLimit, newDeliveryProviderAddress)
     *
     *  @notice *** This will only be able to succeed if the following is true **
     *         - newGasLimit >= gas limit of the old instruction
     *         - newReceiverValue >= receiver value of the old instruction
     *         - newDeliveryProvider's `targetChainRefundPerGasUnused` >= old relay provider's `targetChainRefundPerGasUnused`
     *
     * @param deliveryVaaKey VaaKey identifying the wormhole message containing the
     *        previously published delivery instructions
     * @param targetChain The target chain that the original delivery targeted. Must match targetChain from original delivery instructions
     * @param newReceiverValue new msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param newGasLimit gas limit with which to call `targetAddress`. Any units of gas unused will be refunded according to the
     *        `targetChainRefundPerGasUnused` rate quoted by the delivery provider, to the refund chain and address specified in the original request
     * @param newDeliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @return sequence sequence number of published VAA containing redelivery instructions
     *
     * @notice *** This will only be able to succeed if the following is true **
     *         - newGasLimit >= gas limit of the old instruction
     *         - newReceiverValue >= receiver value of the old instruction
     *         - newDeliveryProvider's `targetChainRefundPerGasUnused` >= old relay provider's `targetChainRefundPerGasUnused`
     */
    function resendToEvm(
        VaaKey memory deliveryVaaKey,
        uint16 targetChain,
        uint256 newReceiverValue,
        uint256 newGasLimit,
        address newDeliveryProviderAddress
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Requests a previously published delivery instruction to be redelivered
     *
     *
     * This function must be called with `msg.value` equal to
     * quoteDeliveryPrice(targetChain, newReceiverValue, newEncodedExecutionParameters, newDeliveryProviderAddress)
     *
     * @param deliveryVaaKey VaaKey identifying the wormhole message containing the
     *        previously published delivery instructions
     * @param targetChain The target chain that the original delivery targeted. Must match targetChain from original delivery instructions
     * @param newReceiverValue new msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param newEncodedExecutionParameters new encoded information on how to execute delivery that may impact pricing
     *        e.g. for version EVM_V1, this is a struct that encodes the `gasLimit` with which to call `targetAddress`
     * @param newDeliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @return sequence sequence number of published VAA containing redelivery instructions
     *
     *  @notice *** This will only be able to succeed if the following is true **
     *         - (For EVM_V1) newGasLimit >= gas limit of the old instruction
     *         - newReceiverValue >= receiver value of the old instruction
     *         - (For EVM_V1) newDeliveryProvider's `targetChainRefundPerGasUnused` >= old relay provider's `targetChainRefundPerGasUnused`
     */
    function resend(
        VaaKey memory deliveryVaaKey,
        uint16 targetChain,
        uint256 newReceiverValue,
        bytes memory newEncodedExecutionParameters,
        address newDeliveryProviderAddress
    )
        external
        payable
        returns (uint64 sequence);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Returns the price to request a relay to chain `targetChain`, using the default delivery provider
     *
     * @param targetChain in Wormhole Chain ID format
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param gasLimit gas limit with which to call `targetAddress`.
     * @return nativePriceQuote Price, in units of current chain currency, that the delivery provider charges to perform the relay
     * @return targetChainRefundPerGasUnused amount of target chain currency that will be refunded per unit of gas unused,
     *         if a refundAddress is specified
     */
    function quoteEVMDeliveryPrice(
        uint16 targetChain,
        uint256 receiverValue,
        uint256 gasLimit
    )
        external
        view
        returns (
            uint256 nativePriceQuote,
            uint256 targetChainRefundPerGasUnused
        );

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Returns the price to request a relay to chain `targetChain`, using delivery provider `deliveryProviderAddress`
     *
     * @param targetChain in Wormhole Chain ID format
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param gasLimit gas limit with which to call `targetAddress`.
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @return nativePriceQuote Price, in units of current chain currency, that the delivery provider charges to perform the relay
     * @return targetChainRefundPerGasUnused amount of target chain currency that will be refunded per unit of gas unused,
     *         if a refundAddress is specified
     */
    function quoteEVMDeliveryPrice(
        uint16 targetChain,
        uint256 receiverValue,
        uint256 gasLimit,
        address deliveryProviderAddress
    )
        external
        view
        returns (
        uint256 nativePriceQuote,
        uint256 targetChainRefundPerGasUnused
        );

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Returns the price to request a relay to chain `targetChain`, using delivery provider `deliveryProviderAddress`
     *
     * @param targetChain in Wormhole Chain ID format
     * @param receiverValue msg.value that delivery provider should pass in for call to `targetAddress` (in targetChain currency units)
     * @param encodedExecutionParameters encoded information on how to execute delivery that may impact pricing
     *        e.g. for version EVM_V1, this is a struct that encodes the `gasLimit` with which to call `targetAddress`
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @return nativePriceQuote Price, in units of current chain currency, that the delivery provider charges to perform the relay
     * @return encodedExecutionInfo encoded information on how the delivery will be executed
     *        e.g. for version EVM_V1, this is a struct that encodes the `gasLimit` and `targetChainRefundPerGasUnused`
     *             (which is the amount of target chain currency that will be refunded per unit of gas unused,
     *              if a refundAddress is specified)
     */
    function quoteDeliveryPrice(
        uint16 targetChain,
        uint256 receiverValue,
        bytes memory encodedExecutionParameters,
        address deliveryProviderAddress
    )
        external
        view
        returns (
        uint256 nativePriceQuote,
        bytes memory encodedExecutionInfo
        );

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Returns the (extra) amount of target chain currency that `targetAddress`
     * will be called with, if the `paymentForExtraReceiverValue` field is set to `currentChainAmount`
     *
     * @param targetChain in Wormhole Chain ID format
     * @param currentChainAmount The value that `paymentForExtraReceiverValue` will be set to
     * @param deliveryProviderAddress The address of the desired delivery provider's implementation of IDeliveryProvider
     * @return targetChainAmount The amount such that if `targetAddress` will be called with `msg.value` equal to
     *         receiverValue + targetChainAmount
     */
    function quoteNativeForChain(
        uint16 targetChain,
        uint256 currentChainAmount,
        address deliveryProviderAddress
    )
        external
        view
        returns (uint256 targetChainAmount);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Returns the address of the current default delivery provider
     * @return deliveryProvider The address of (the default delivery provider)'s contract on this source
     *   chain. This must be a contract that implements IDeliveryProvider.
     */
    function getDefaultDeliveryProvider()
        external
        view
        returns (address deliveryProvider);
}

/// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| \\\

/**
 * @title IWormholeRelayerDelivery
 * @notice The interface to execute deliveries. Only relevant for Delivery Providers
 */
interface IWormholeRelayerDelivery is IWormholeRelayerBase {

    /// -------------------------------------- ENUMS ---------------------------------------- \\\

    /**
     * @notice Represents the possible statuses of a delivery.
     */
    enum DeliveryStatus {
        SUCCESS,
        RECEIVER_FAILURE,
        FORWARD_REQUEST_FAILURE,
        FORWARD_REQUEST_SUCCESS
    }

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * @notice Represents the possible statuses of a refund after a delivery attempt.
     */
    enum RefundStatus {
        REFUND_SENT,
        REFUND_FAIL,
        CROSS_CHAIN_REFUND_SENT,
        CROSS_CHAIN_REFUND_FAIL_PROVIDER_NOT_SUPPORTED,
        CROSS_CHAIN_REFUND_FAIL_NOT_ENOUGH
    }

    /// -------------------------------------- EVENT ---------------------------------------- \\\

    /**
     * @custom:member recipientContract - The target contract address
     * @custom:member sourceChain - The chain which this delivery was requested from (in wormhole
     *     ChainID format)
     * @custom:member sequence - The wormhole sequence number of the delivery VAA on the source chain
     *     corresponding to this delivery request
     * @custom:member deliveryVaaHash - The hash of the delivery VAA corresponding to this delivery
     *     request
     * @custom:member gasUsed - The amount of gas that was used to call your target contract
     * @custom:member status:
     *   - RECEIVER_FAILURE, if the target contract reverts
     *   - SUCCESS, if the target contract doesn't revert and no forwards were requested
     *   - FORWARD_REQUEST_FAILURE, if the target contract doesn't revert, forwards were requested,
     *       but provided/leftover funds were not sufficient to cover them all
     *   - FORWARD_REQUEST_SUCCESS, if the target contract doesn't revert and all forwards are covered
     * @custom:member additionalStatusInfo:
     *   - If status is SUCCESS or FORWARD_REQUEST_SUCCESS, then this is empty.
     *   - If status is RECEIVER_FAILURE, this is `RETURNDATA_TRUNCATION_THRESHOLD` bytes of the
     *       return data (i.e. potentially truncated revert reason information).
     *   - If status is FORWARD_REQUEST_FAILURE, this is also the revert data - the reason the forward failed.
     *     This will be either an encoded Cancelled, DeliveryProviderReverted, or DeliveryProviderPaymentFailed error
     * @custom:member refundStatus - Result of the refund. REFUND_SUCCESS or REFUND_FAIL are for
     *     refunds where targetChain=refundChain; the others are for targetChain!=refundChain,
     *     where a cross chain refund is necessary
     * @custom:member overridesInfo:
     *   - If not an override: empty bytes array
     *   - Otherwise: An encoded `DeliveryOverride`
     */
    event Delivery(
        address indexed recipientContract,
        uint16 indexed sourceChain,
        uint64 indexed sequence,
        bytes32 deliveryVaaHash,
        DeliveryStatus status,
        uint256 gasUsed,
        RefundStatus refundStatus,
        bytes additionalStatusInfo,
        bytes overridesInfo
    );

    /// --------------------------------- EXTERNAL FUNCTION --------------------------------- \\\

    /**
     * @notice The delivery provider calls `deliver` to relay messages as described by one delivery instruction
     *
     * The delivery provider must pass in the specified (by VaaKeys[]) signed wormhole messages (VAAs) from the source chain
     * as well as the signed wormhole message with the delivery instructions (the delivery VAA)
     *
     * The messages will be relayed to the target address (with the specified gas limit and receiver value) iff the following checks are met:
     * - the delivery VAA has a valid signature
     * - the delivery VAA's emitter is one of these WormholeRelayer contracts
     * - the delivery provider passed in at least enough of this chain's currency as msg.value (enough meaning the maximum possible refund)
     * - the instruction's target chain is this chain
     * - the relayed signed VAAs match the descriptions in container.messages (the VAA hashes match, or the emitter address, sequence number pair matches, depending on the description given)
     *
     * @param encodedVMs - An array of signed wormhole messages (all from the same source chain
     *     transaction)
     * @param encodedDeliveryVAA - Signed wormhole message from the source chain's WormholeRelayer
     *     contract with payload being the encoded delivery instruction container
     * @param relayerRefundAddress - The address to which any refunds to the delivery provider
     *     should be sent
     * @param deliveryOverrides - Optional overrides field which must be either an empty bytes array or
     *     an encoded DeliveryOverride struct
     */
    function deliver(
        bytes[] memory encodedVMs,
        bytes memory encodedDeliveryVAA,
        address payable relayerRefundAddress,
        bytes memory deliveryOverrides
    )
        external
        payable;
}

/// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| \\\

/**
 * @title IWormholeRelayer
 * @notice Interface for the primary Wormhole Relayer which aggregates the functionalities of the Delivery and Send interfaces.
 */
interface IWormholeRelayer is
    IWormholeRelayerDelivery,
    IWormholeRelayerSend {}

    // Bound chosen by the following formula: `memoryWord * 4 + selectorSize`.
    // This means that an error identifier plus four fixed size arguments should be available to developers.
    // In the case of a `require` revert with error message, this should provide 2 memory word's worth of data.
    uint256 constant RETURNDATA_TRUNCATION_THRESHOLD = 132;

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to conversion and validation of EVM addresses.
     */
    error NotAnEvmAddress(bytes32);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to unauthorised access or usage.
     */
    error RequesterNotWormholeRelayer();

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors for when there are issues with the overrides provided.
     */
    error InvalidOverrideGasLimit();
    error InvalidOverrideReceiverValue();
    error InvalidOverrideRefundPerGasUnused();

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to the state and progress of the WormholeRelayer's operations.
     */
    error NoDeliveryInProgress();
    error ReentrantDelivery(address msgSender, address lockedBy);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to funding and refunds.
     */
    error InsufficientRelayerFunds(uint256 msgValue, uint256 minimum);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to the VAA (signed wormhole message) validation.
     */
    error VaaKeysDoNotMatchVaas(uint8 index);
    error VaaKeysLengthDoesNotMatchVaasLength(uint256 keys, uint256 vaas);
    error InvalidEmitter(bytes32 emitter, bytes32 registered, uint16 chainId);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to payment values and delivery prices.
     */
    error RequestedGasLimitTooLow();
    error DeliveryProviderCannotReceivePayment();
    error InvalidMsgValue(uint256 msgValue, uint256 totalFee);
    error DeliveryProviderDoesNotSupportTargetChain(address relayer, uint16 chainId);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors for when there are issues with forwarding or delivery.
     */
    error InvalidVaaKeyType(uint8 parsed);
    error InvalidDeliveryVaa(string reason);
    error InvalidPayloadId(uint8 parsed, uint8 expected);
    error InvalidPayloadLength(uint256 received, uint256 expected);
    error ForwardRequestFromWrongAddress(address msgSender, address deliveryTarget);

    /// ------------------------------------------------------------------------------------- \\\

    /**
     * Errors related to relaying instructions and target chains.
     */
    error TargetChainIsNotThisChain(uint16 targetChain);
    error ForwardNotSufficientlyFunded(uint256 amountOfFunds, uint256 amountOfFundsNeeded);

    /// ------------------------------------------------------------------------------------- \\\

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

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * 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[EIP 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
// OpenZeppelin Contracts (last updated v4.9.2) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(bytes32[] calldata proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 proofLen = proof.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proofLen - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            require(proofPos == proofLen, "MerkleProof: invalid multiproof");
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 proofLen = proof.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proofLen - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            require(proofPos == proofLen, "MerkleProof: invalid multiproof");
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library StringToAddress {
    error InvalidAddressString();

    function toAddress(string memory addressString) internal pure returns (address) {
        bytes memory stringBytes = bytes(addressString);
        uint160 addressNumber = 0;
        uint8 stringByte;

        if (stringBytes.length != 42 || stringBytes[0] != '0' || stringBytes[1] != 'x') revert InvalidAddressString();

        for (uint256 i = 2; i < 42; ++i) {
            stringByte = uint8(stringBytes[i]);

            if ((stringByte >= 97) && (stringByte <= 102)) stringByte -= 87;
            else if ((stringByte >= 65) && (stringByte <= 70)) stringByte -= 55;
            else if ((stringByte >= 48) && (stringByte <= 57)) stringByte -= 48;
            else revert InvalidAddressString();

            addressNumber |= uint160(uint256(stringByte) << ((41 - i) << 2));
        }
        return address(addressNumber);
    }
}

library AddressToString {
    function toString(address addr) internal pure returns (string memory) {
        bytes memory addressBytes = abi.encodePacked(addr);
        uint256 length = addressBytes.length;
        bytes memory characters = '0123456789abcdef';
        bytes memory stringBytes = new bytes(2 + addressBytes.length * 2);

        stringBytes[0] = '0';
        stringBytes[1] = 'x';

        for (uint256 i; i < length; ++i) {
            stringBytes[2 + i * 2] = characters[uint8(addressBytes[i] >> 4)];
            stringBytes[3 + i * 2] = characters[uint8(addressBytes[i] & 0x0f)];
        }
        return string(stringBytes);
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.5.0;

import "./ILayerZeroUserApplicationConfig.sol";

interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(
        uint16 _dstChainId,
        bytes calldata _destination,
        bytes calldata _payload,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    ) external payable;

    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        address _dstAddress,
        uint64 _nonce,
        uint _gasLimit,
        bytes calldata _payload
    ) external;

    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);

    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);

    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(
        uint16 _dstChainId,
        address _userApplication,
        bytes calldata _payload,
        bool _payInZRO,
        bytes calldata _adapterParam
    ) external view returns (uint nativeFee, uint zroFee);

    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);

    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;

    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);

    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);

    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);

    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);

    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);

    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(
        uint16 _version,
        uint16 _chainId,
        address _userApplication,
        uint _configType
    ) external view returns (bytes memory);

    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);

    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}

// 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

pragma solidity ^0.8.0;

import { IAxelarGateway } from '../interfaces/IAxelarGateway.sol';
import { IAxelarExecutable } from '../interfaces/IAxelarExecutable.sol';

contract AxelarExecutable is IAxelarExecutable {
    IAxelarGateway public immutable gateway;

    constructor(address gateway_) {
        if (gateway_ == address(0)) revert InvalidAddress();

        gateway = IAxelarGateway(gateway_);
    }

    function execute(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes calldata payload
    ) external {
        bytes32 payloadHash = keccak256(payload);

        if (!gateway.validateContractCall(commandId, sourceChain, sourceAddress, payloadHash))
            revert NotApprovedByGateway();

        _execute(sourceChain, sourceAddress, payload);
    }

    function executeWithToken(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes calldata payload,
        string calldata tokenSymbol,
        uint256 amount
    ) external {
        bytes32 payloadHash = keccak256(payload);

        if (
            !gateway.validateContractCallAndMint(
                commandId,
                sourceChain,
                sourceAddress,
                payloadHash,
                tokenSymbol,
                amount
            )
        ) revert NotApprovedByGateway();

        _executeWithToken(sourceChain, sourceAddress, payload, tokenSymbol, amount);
    }

    function _execute(
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes calldata payload
    ) internal virtual {}

    function _executeWithToken(
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes calldata payload,
        string calldata tokenSymbol,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { IAxelarGateway } from './IAxelarGateway.sol';

interface IAxelarExecutable {
    error InvalidAddress();
    error NotApprovedByGateway();

    function gateway() external view returns (IAxelarGateway);

    function execute(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes calldata payload
    ) external;

    function executeWithToken(
        bytes32 commandId,
        string calldata sourceChain,
        string calldata sourceAddress,
        bytes calldata payload,
        string calldata tokenSymbol,
        uint256 amount
    ) external;
}

// 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: BUSL-1.1

pragma solidity >=0.5.0;

interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;

    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;

    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;

    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}