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// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.18;

import {MerkleProof} from "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IYSL} from "./interfaces/IYSL.sol";

/*
 * @title YSL Contract
 *
 * @notice This contract implements the YSL token, which is an ERC20 token with additional
 * functionality for bridging and burning.
 *
 * 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.
 */
contract YSL is
    IYSL,
    ERC20
{

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

    /**
     * @notice Root of the Merkle tree used for airdrop claims.
     */
    bytes32 public merkleRoot;

    /**
     * @notice Deadline for claiming airdrops.
     */
    uint256 public immutable CLAIM_DEADLINE;

    /// ------------------------------------ MAPPINGS --------------------------------------- \\\

    /**
     * @notice Mapping to track if a user has claimed their airdrop.
     */
    mapping (bytes32 => bool) public airdropClaimed;

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

    /**
     * @notice Constructor for the YSL token, setting up necessary dependencies and initial state.
     * @dev Initialises the token with a given Merkle root for airdrop claims, sets up interfaces for
     * various services (like Axelar and LayerZero), and computes the string representation of the contract's address.
     * @param _merkleRoot Root of the Merkle tree for airdrop claims.
     */
    constructor(
        bytes32 _merkleRoot
    ) ERC20("YSL", "YSL") {
        merkleRoot = _merkleRoot;
        CLAIM_DEADLINE = block.timestamp + 90 days;
    }

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

    /**
     * @notice Burns a specified amount of tokens from a user's address.
     * @dev Only addresses with the required allowance can burn tokens on behalf of a user.
     * @param _user Address from which tokens will be burned.
     * @param _amount Amount of tokens to burn.
     */
    function burn(
        address _user,
        uint256 _amount
    )
        external
        override
    {
        if (_user != msg.sender)
            _spendAllowance(_user, msg.sender, _amount);
            _burn(_user, _amount);
    }

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

    /**
     * @notice Allows users to claim their airdropped tokens using a Merkle proof.
     * @dev Verifies the Merkle proof against the stored Merkle root and mints the claimed amount to the user.
     * @param proof Array of bytes32 values representing the Merkle proof.
     * @param account Address of the user claiming the airdrop.
     * @param amount Amount of tokens being claimed.
     */
    function claim(
        bytes32[] calldata proof,
        address account,
        uint256 amount
    )
        external
        override
    {
        if (block.timestamp > CLAIM_DEADLINE) {
            revert ClaimPeriodExpired();
        }
        bytes32 leaf = keccak256(bytes.concat(keccak256(abi.encode(account, amount))));
        if (!MerkleProof.verify(proof, merkleRoot, leaf)) {
            revert InvalidClaimProof();
        }
        if (airdropClaimed[leaf]) {
            revert AirdropAlreadyClaimed();
        }
        airdropClaimed[leaf] = true;
        _mint(account, amount);
        emit Airdropped(account, amount);
    }

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

// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.5.0;

interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}

// 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 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
// 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/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;
    }
}

// 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: Unlicensed

pragma solidity 0.8.18;

/*
 * @title IWormholeReceiver Interface
 *
 * @notice Interface for a contract which can receive Wormhole messages.
 *
 * 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 IWormholeReceiver {

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

    /**
     * @notice Called by the WormholeRelayer contract to deliver a Wormhole message to this contract.
     *
     * @dev This function should be implemented to include access controls to ensure that only
     *      the Wormhole Relayer contract can invoke it.
     *
     *      Implementations should:
     *      - Maintain a mapping of received `deliveryHash`s to prevent duplicate message delivery.
     *      - Verify the authenticity of `sourceChain` and `sourceAddress` to prevent unauthorized or malicious calls.
     *
     * @param payload The arbitrary data included in the message by the sender.
     * @param additionalVaas Additional VAAs that were requested to be included in this delivery.
     *                       Guaranteed to be in the same order as specified by the sender.
     * @param sourceAddress The Wormhole-formatted address of the message sender on the originating chain.
     * @param sourceChain The Wormhole Chain ID of the originating blockchain.
     * @param deliveryHash The VAA hash of the deliveryVAA, used to prevent duplicate delivery.
     *
     * Warning: The provided VAAs are NOT verified by the Wormhole core contract prior to this call.
     *          Always invoke `parseAndVerify()` on the Wormhole core contract to validate the VAAs before trusting them.
     */
    function receiveWormholeMessages(
        bytes memory payload,
        bytes[] memory additionalVaas,
        bytes32 sourceAddress,
        uint16 sourceChain,
        bytes32 deliveryHash
    ) external payable;

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

// SPDX-License-Identifier: Unlicensed

pragma solidity 0.8.18;

/**
 * @title IWormholeRelayer Interface
 *
 * @notice This project allows developers to build cross-chain applications powered by Wormhole without needing to
 * write and run their own relaying infrastructure. We implement the IWormholeRelayer interface that allows users to
 * request a delivery provider to relay a payload (and/or additional VAAs) to a chain and address of their choice.
 *
 * 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.
 */

/// ------------------------------------- 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 unauthorized 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: Unlicensed

pragma solidity 0.8.18;

import {ILayerZeroReceiver} from "@layerzerolabs/lz-evm-sdk-v1-0.7/contracts/interfaces/ILayerZeroReceiver.sol";
import {IWormholeReceiver} from "./IWormholeReceiver.sol";
import {IWormholeRelayer} from "./IWormholeRelayer.sol";

/*
 * @title YSL interface
 *
 * @notice This interface outlines functions for the YSL token, which is an ERC20 token with additional
 * functionality for bridging and burning.
 *
 * 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 IYSL
{
    /// -------------------------------------- ERRORS --------------------------------------- \\\

    /**
     * @notice This error is thrown when an invalid claim proof is provided.
     */
    error InvalidClaimProof();

    /**
     * @notice This error is thrown when the claim period has expired.
     */
    error ClaimPeriodExpired();

    /**
     * @notice This error is thrown when an airdrop has already been claimed.
     */
    error AirdropAlreadyClaimed();

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

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

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

    /**
     * @notice Burns a specified amount of tokens from a user's address.
     * @dev Only addresses with the required allowance can burn tokens on behalf of a user.
     * @param _user Address from which tokens will be burned.
     * @param _amount Amount of tokens to burn.
     */
    function burn(
        address _user,
        uint256 _amount
    ) external;

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

    /**
     * @notice Allows users to claim their airdropped tokens using a Merkle proof.
     * @dev Verifies the Merkle proof against the stored Merkle root and mints the claimed amount to the user.
     * @param proof Array of bytes32 values representing the Merkle proof.
     * @param account Address of the user claiming the airdrop.
     * @param amount Amount of tokens being claimed.
     */
    function claim(
        bytes32[] calldata proof,
        address account,
        uint256 amount
    ) external;

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

{
  "optimizer": {
    "enabled": true,
    "runs": 2
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"bytes32","name":"_merkleRoot","type":"bytes32"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AirdropAlreadyClaimed","type":"error"},{"inputs":[],"name":"ClaimPeriodExpired","type":"error"},{"inputs":[],"name":"InvalidClaimProof","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Airdropped","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"CLAIM_DEADLINE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"airdropClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"proof","type":"bytes32[]"},{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"merkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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6a6868d617a54dbd4079e8492f768179bb0df64f4e50f0522220bfbcd78f8ea1

-----Decoded View---------------
Arg [0] : _merkleRoot (bytes32): 0x6a6868d617a54dbd4079e8492f768179bb0df64f4e50f0522220bfbcd78f8ea1

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 6a6868d617a54dbd4079e8492f768179bb0df64f4e50f0522220bfbcd78f8ea1