/*
 * @brief Defines the backend module to communicate with the backend
 * @file aman/com/Backend.h
 * @author Sven Czarnian <devel@svcz.de>
 * @copyright Copyright 2021 Sven Czarnian
 * @license This project is published under the GNU General Public License v3 (GPLv3)
 */

#pragma once

#include <zmq.hpp>

#include <aman/types/Communication.h>

#pragma warning(push, 0)
#include <protobuf/Communication.pb.h>
#pragma warning(pop)

namespace aman {
    /**
     * @brief Defines the bakcend class which sends and receives aircraft information to and from the backend
     * @ingroup com
     */
    class Backend {
    private:
        std::unique_ptr<zmq::socket_t> m_socket;

        Backend() noexcept;

        template <typename T>
        bool setSocketKey(const std::string& key, T entry) {
            try {
                this->m_socket->set(entry, key);
                return true;
            }
            catch (std::exception&) {
                return false;
            }
        }

        std::shared_ptr<aman::AircraftSequence> receiveSequence();

    public:
        Backend(const Backend&) = delete;
        Backend(Backend&&) = delete;
        Backend& operator=(const Backend&) = delete;
        Backend& operator=(Backend&&) = delete;

        /**
         * @brief Initializes the aircraft reporter
         * @param[in] configuration The current AMAM communication configuration
         * @return True if the initialization is done, else false
         */
        bool initialize(const Communication& configuration);
        /**
         * @brief Terminates the reporter connection
         */
        bool deinitialize();
        /**
         * @brief Checks if the reporter is initialized
         * @return True if it is initialized, else false
         */
        bool initialized() const noexcept;
        /**
         * @brief Sends a new message to the backend
         * @param[in] report The new aircraft update
         * @return Receives the current sequence of the airport
         */
        std::shared_ptr<aman::AircraftSequence> update(aman::AircraftUpdate& report);
        /**
         * @brief Returns the reporter instance
         * @return The system-wide instance
         */
        static Backend& instance() noexcept;
    };
}