/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop 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.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014 John Preston, https://desktop.telegram.org
*/
#pragma once

#include "types.h"

void audioInit();
bool audioWorks();
void audioPlayNotify();
void audioFinish();

enum AudioPlayerState {
	AudioPlayerStopped,
	AudioPlayerStoppedAtStart,
	AudioPlayerStarting,
	AudioPlayerPlaying,
	AudioPlayerFinishing,
	AudioPlayerPausing,
	AudioPlayerPaused,
	AudioPlayerResuming,
};

class AudioPlayerFader;
class AudioPlayerLoaders;

class AudioPlayer : public QObject {
	Q_OBJECT

public:

	AudioPlayer();

	void play(AudioData *audio);
	void pauseresume();

	void currentState(AudioData **audio, AudioPlayerState *state = 0, int64 *position = 0, int64 *duration = 0, int32 *frequency = 0);
	void clearStoppedAtStart(AudioData *audio);
	void resumeDevice();

	~AudioPlayer();

public slots:

	void onError(AudioData *audio);

signals:

	void updated(AudioData *audio);
	void stopped(AudioData *audio);

	void faderOnTimer();
	void loaderOnStart(AudioData *audio);
	void loaderOnCancel(AudioData *audio);

private:

	bool updateCurrentStarted(int32 pos = -1);

	struct Msg {
		Msg() : audio(0), position(0), duration(0), frequency(AudioVoiceMsgFrequency), skipStart(0), skipEnd(0), loading(0), started(0),
			state(AudioPlayerStopped), source(0), nextBuffer(0) {
			memset(buffers, 0, sizeof(buffers));
			memset(samplesCount, 0, sizeof(samplesCount));
		}
		AudioData *audio;
		QString fname;
		QByteArray data;
		int64 position, duration;
		int32 frequency;
		int64 skipStart, skipEnd;
		bool loading;
		int64 started;
		AudioPlayerState state;

		uint32 source;
		int32 nextBuffer;
		uint32 buffers[3];
		int64 samplesCount[3];
	};

	int32 _current;
	Msg _data[AudioVoiceMsgSimultaneously];

	QMutex _mutex;

	friend class AudioPlayerFader;
	friend class AudioPlayerLoaders;

	QThread _faderThread, _loaderThread;
	AudioPlayerFader *_fader;
	AudioPlayerLoaders *_loader;

};

class AudioCaptureInner;

class AudioCapture : public QObject {
	Q_OBJECT

public:

	AudioCapture();

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

	bool check();

	~AudioCapture();

signals:

	void captureOnStart();
	void captureOnStop(bool needResult);

	void onDone(QByteArray data, qint32 samples);
	void onUpdate(qint16 level, qint32 samples);
	void onError();

private:

	friend class AudioCaptureInner;

	QThread _captureThread;
	AudioCaptureInner *_capture;

};

AudioPlayer *audioPlayer();
AudioCapture *audioCapture();

class AudioPlayerFader : public QObject {
	Q_OBJECT

public:

	AudioPlayerFader(QThread *thread);
	void resumeDevice();

signals:

	void error(AudioData *audio);
	void playPositionUpdated(AudioData *audio);
	void audioStopped(AudioData *audio);
	void needToPreload(AudioData *audio);

	void stopPauseDevice();

public slots:

	void onInit();
	void onTimer();
	void onPauseTimer();
	void onPauseTimerStop();

private:

	QTimer _timer, _pauseTimer;
	QMutex _pauseMutex;
	bool _pauseFlag, _paused;

};

class AudioPlayerLoader;
class AudioPlayerLoaders : public QObject {
	Q_OBJECT

public:

	AudioPlayerLoaders(QThread *thread);
	~AudioPlayerLoaders();

signals:

	void error(AudioData *audio);
	void needToCheck();

public slots:

	void onInit();
	void onStart(AudioData *audio);
	void onLoad(AudioData *audio);
	void onCancel(AudioData *audio);
	
private:

	typedef QMap<AudioData*, AudioPlayerLoader*> Loaders;
	Loaders _loaders;

	void loadError(Loaders::iterator i);

};

struct AudioCapturePrivate;

class AudioCaptureInner : public QObject {
	Q_OBJECT

public:

	AudioCaptureInner(QThread *thread);
	~AudioCaptureInner();

signals:

	void error();
	void update(qint16 level, qint32 samples);
	void done(QByteArray data, qint32 samples);

public slots:

	void onInit();
	void onStart();
	void onStop(bool needResult);

	void onTimeout();

private:

	void writeFrame(int32 offset, int32 framesize);

	AudioCapturePrivate *d;
	QTimer _timer;
	QByteArray _captured;

};