/***
    This file is part of snapcast
    Copyright (C) 2014-2021  Johannes Pohl

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
***/

#ifndef SERVER_HPP
#define SERVER_HPP

#include <boost/asio.hpp>
#include <memory>
#include <mutex>
#include <set>
#include <sstream>
#include <vector>

#include "common/queue.h"
#include "common/sample_format.hpp"
#include "control_server.hpp"
#include "jsonrpcpp.hpp"
#include "message/codec_header.hpp"
#include "message/message.hpp"
#include "message/server_settings.hpp"
#include "server_settings.hpp"
#include "stream_server.hpp"
#include "stream_session.hpp"
#include "streamreader/stream_manager.hpp"

using namespace streamreader;

using boost::asio::ip::tcp;
using acceptor_ptr = std::unique_ptr<tcp::acceptor>;
using session_ptr = std::shared_ptr<StreamSession>;


/// Forwars PCM data to the connected clients
/**
 * Reads PCM data using PipeStream, implements PcmListener to get the (encoded) PCM stream.
 * Accepts and holds client connections (StreamSession)
 * Receives (via the StreamMessageReceiver interface) and answers messages from the clients
 * Forwards PCM data to the clients
 */
class Server : public StreamMessageReceiver, public ControlMessageReceiver, public PcmListener
{
public:
    // TODO: revise handler names
    using OnResponse = std::function<void(jsonrpcpp::entity_ptr response, jsonrpcpp::notification_ptr notification)>;

    Server(boost::asio::io_context& io_context, const ServerSettings& serverSettings);
    virtual ~Server();

    void start();
    void stop();

private:
    /// Implementation of StreamMessageReceiver
    void onMessageReceived(StreamSession* streamSession, const msg::BaseMessage& baseMessage, char* buffer) override;
    void onDisconnect(StreamSession* streamSession) override;

    /// Implementation of ControllMessageReceiver
    void onMessageReceived(std::shared_ptr<ControlSession> controlSession, const std::string& message, const ResponseHander& response_handler) override;
    void onNewSession(std::shared_ptr<ControlSession> session) override
    {
        std::ignore = session;
    };
    void onNewSession(std::shared_ptr<StreamSession> session) override;

    /// Implementation of PcmListener
    void onMetaChanged(const PcmStream* pcmStream) override;
    void onPropertiesChanged(const PcmStream* pcmStream) override;
    void onStateChanged(const PcmStream* pcmStream, ReaderState state) override;
    void onChunkRead(const PcmStream* pcmStream, const msg::PcmChunk& chunk) override;
    void onChunkEncoded(const PcmStream* pcmStream, std::shared_ptr<msg::PcmChunk> chunk, double duration) override;
    void onResync(const PcmStream* pcmStream, double ms) override;

private:
    void processRequest(const jsonrpcpp::request_ptr request, const OnResponse& on_response) const;
    /// Save the server state deferred to prevent blocking and lower disk io
    /// @param deferred the delay after the last call to saveConfig
    void saveConfig(const std::chrono::milliseconds& deferred = std::chrono::seconds(2));

    mutable std::recursive_mutex sessionsMutex_;
    mutable std::recursive_mutex clientMutex_;
    boost::asio::io_context& io_context_;
    boost::asio::steady_timer config_timer_;

    ServerSettings settings_;
    Queue<std::shared_ptr<msg::BaseMessage>> messages_;
    std::unique_ptr<ControlServer> controlServer_;
    std::unique_ptr<StreamServer> streamServer_;
    std::unique_ptr<StreamManager> streamManager_;
};



#endif