//
// This file is part of Kepka,
// an unofficial desktop version of Telegram messaging app,
// see https://github.com/procxx/kepka
//
// Kepka 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.
//
// It 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.
//
// In addition, as a special exception, the copyright holders give permission
// to link the code of portions of this program with the OpenSSL library.
//
// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
//
#pragma once

#include "structs.h"
#include <QObject>
#include <QThread>
#include <QTimer>

struct AVFrame;

namespace Media {
namespace Capture {

void Start();
void Finish();

class Instance : public QObject {
	Q_OBJECT

public:
	Instance();

	void check();
	bool available() const {
		return _available;
	}

	~Instance();

signals:
	void start();
	void stop(bool needResult);

	void done(QByteArray data, VoiceWaveform waveform, qint32 samples);
	void updated(quint16 level, qint32 samples);
	void error();

private:
	class Inner;
	friend class Inner;

	bool _available = false;
	QThread _thread;
	Inner *_inner;
};

Instance *instance();

class Instance::Inner : public QObject {
	Q_OBJECT

public:
	Inner(QThread *thread);
	~Inner();

signals:
	void error();
	void updated(quint16 level, qint32 samples);
	void done(QByteArray data, VoiceWaveform waveform, qint32 samples);

public slots:
	void onInit();
	void onStart();
	void onStop(bool needResult);

	void onTimeout();

private:
	void processFrame(qint32 offset, qint32 framesize);

	void writeFrame(AVFrame *frame);

	// Writes the packets till EAGAIN is got from av_receive_packet()
	// Returns number of packets written or -1 on error
	int writePackets();

	struct Private;
	Private *d;
	QTimer _timer;
	QByteArray _captured;
};

} // namespace Capture
} // namespace Media