/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 Olive Team

  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 AUDIOMANAGER_H
#define AUDIOMANAGER_H

#include <memory>
#include <QtConcurrent/QtConcurrent>
#include <QThread>
#include <portaudio.h>

#include "audiovisualwaveform.h"
#include "audio/audioprocessor.h"
#include "common/define.h"
#include "codec/ffmpeg/ffmpegencoder.h"
#include "render/audioplaybackcache.h"
#include "render/previewaudiodevice.h"

namespace olive
{

/**
 * @brief Audio input and output management class
 *
 * Wraps around a QAudioOutput and AudioHybridDevice, connecting them together and exposing audio functionality to
 * the rest of the system.
 */
class AudioManager : public QObject {
	Q_OBJECT
public:
	static void CreateInstance();
	static void DestroyInstance();

	static AudioManager *instance();

	void SetOutputNotifyInterval(int n);

	bool PushToOutput(const AudioParams &params, const QByteArray &samples,
					  QString *error = nullptr);

	void ClearBufferedOutput();

	void StopOutput();

	PaDeviceIndex GetOutputDevice() const
	{
		return output_device_;
	}

	PaDeviceIndex GetInputDevice() const
	{
		return input_device_;
	}

	void SetOutputDevice(PaDeviceIndex device);

	void SetInputDevice(PaDeviceIndex device);

	void HardReset();

	bool StartRecording(const EncodingParams &params,
						QString *error_str = nullptr);

	void StopRecording();

	static PaDeviceIndex FindConfigDeviceByName(bool is_output_device);
	static PaDeviceIndex FindDeviceByName(const QString &s,
										  bool is_output_device);

	static PaStreamParameters GetPortAudioParams(const AudioParams &p,
												 PaDeviceIndex device);

signals:
	void OutputNotify();

	void OutputParamsChanged();

private:
	AudioManager();

	virtual ~AudioManager() override;

	static PaSampleFormat GetPortAudioSampleFormat(SampleFormat fmt);

	void CloseOutputStream();

	static AudioManager *instance_;

	PaDeviceIndex output_device_;
	PaStream *output_stream_;
	AudioParams output_params_;
	PreviewAudioDevice *output_buffer_;

	PaDeviceIndex input_device_;
	PaStream *input_stream_;

	FFmpegEncoder *input_encoder_;
};

}

#endif // AUDIOMANAGER_H