// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

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

/**
 * @title ICrossChainLayer
 * @dev An interface for Cross-Chain Layer.
 */
interface ICrossChainLayer is ITacInitializable {

    // Interface

    /**
     * @dev Accepts an TVM->EVM message to process if the Merkle proof is valid.
     * @param messageVersion Message version.
     * @param encodedMessage Encoded message to process.
     * @param merkleProof Merkle proof for the message.
     * @param feeReceiver receiver of fee.
     * @param extraData Untrusted extra data to pass to the message.
     */
    function receiveMessage(
        uint256 messageVersion,
        bytes calldata encodedMessage,
        bytes32[] calldata merkleProof,
        address feeReceiver,
        bytes calldata extraData
    ) external;

    /**
     * @dev Accepts an EVM->TVM message to process (e.g. a callback from dApp).
     * @param messageVersion Message version.
     * @param encodedMessage Encoded message to process.
     */
    function sendMessage(
        uint256 messageVersion,
        bytes calldata encodedMessage
    ) external payable;

    /**
     * @dev Checks if the input (receive) message has been processed.
     * @param messageHash Message hash to check.
     * @return bool True if the message has been processed, false otherwise.
     */
    function getInMessageState(bytes32 messageHash) external view returns (bool);

    /**
     * @dev Gets the current min protocol fee.
     * @return uint256 Fee amount.
     */
    function getProtocolFee() external view returns(uint256);
}