/*
 * libdatachannel streamer example
 * Copyright (c) 2020 Filip Klembara (in2core)
 *
 * 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 2
 * 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 stream_hpp
#define stream_hpp

#include "dispatchqueue.hpp"
#include "rtc/rtc.hpp"

class StreamSource {
protected:
    uint64_t sampleTime_us = 0;
    rtc::binary sample = {};

public:
    StreamSource() { }
    virtual void start() = 0;
    virtual void stop();
    virtual void loadNextSample() = 0;

    inline uint64_t getSampleTime_us() { return sampleTime_us; }
    inline rtc::binary getSample() { return sample; }

    ~StreamSource();
};

class Stream: std::enable_shared_from_this<Stream> {
    uint64_t startTime = 0;
    std::mutex mutex;
    DispatchQueue dispatchQueue = DispatchQueue("StreamQueue");

    bool _isRunning = false;
public:
    const std::shared_ptr<StreamSource> audio;
    const std::shared_ptr<StreamSource> video;
    Stream(std::shared_ptr<StreamSource> video, std::shared_ptr<StreamSource> audio);
    enum class StreamSourceType {
        Audio,
        Video
    };
    ~Stream();

private:
    rtc::synchronized_callback<StreamSourceType, uint64_t, rtc::binary> sampleHandler;

    std::pair<std::shared_ptr<StreamSource>, StreamSourceType> unsafePrepareForSample();

    void sendSample();

public:
    void onSample(std::function<void (StreamSourceType, uint64_t, rtc::binary)> handler);
    void start();
    void stop();
    const bool & isRunning = _isRunning;
};


#endif /* stream_hpp */