// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

// @dev Import the 'MessagingFee' and 'MessagingReceipt' so it's exposed to OApp implementers
// solhint-disable-next-line no-unused-import
import { MessagingParams, MessagingFee, MessagingReceipt } from "@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroEndpointV2.sol";

// @dev Import the 'Origin' so it's exposed to OApp implementers
// solhint-disable-next-line no-unused-import
import { OAppReceiver, Origin } from "@layerzerolabs/oapp-evm/contracts/oapp/OAppReceiver.sol";
import { OAppCore } from "@layerzerolabs/oapp-evm/contracts/oapp/OAppCore.sol";

import { OAppSenderAlt, OAppSender } from "./OAppSenderAlt.sol";
/**
 * @title OAppAlt
 * @dev Abstract contract serving as the base for OAppAlt implementation, combining OAppSenderAlt and OAppReceiver functionality.
 * @dev This is used to interact with LayerZero's EndpointV2Alt
 */
abstract contract OAppAlt is OAppSenderAlt, OAppReceiver {
    /**
     * @dev Constructor to initialize the OAppAlt with the provided alt-endpoint and owner.
     * @param _endpoint The address of the LOCAL LayerZero endpoint.
     * @param _delegate The delegate capable of making OApp configurations inside of the endpoint.
     */
    constructor(address _endpoint, address _delegate) OAppCore(_endpoint, _delegate) {}

    /**
     * @notice Retrieves the OAppAlt version information.
     * @return senderVersion The version of the OAppSenderAlt.sol implementation.
     * @return receiverVersion The version of the OAppReceiver.sol implementation.
     */
    function oAppVersion()
        public
        pure
        virtual
        override(OAppSender, OAppReceiver)
        returns (uint64 senderVersion, uint64 receiverVersion)
    {
        return (SENDER_VERSION, RECEIVER_VERSION);
    }
}