// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.


#include "AudioCommon/AlsaSoundStream.h"
#include "AudioCommon/AOSoundStream.h"
#include "AudioCommon/AudioCommon.h"
#include "AudioCommon/CoreAudioSoundStream.h"
#include "AudioCommon/Mixer.h"
#include "AudioCommon/NullSoundStream.h"
#include "AudioCommon/OpenALStream.h"
#include "AudioCommon/OpenSLESStream.h"
#include "AudioCommon/PulseAudioStream.h"
#include "AudioCommon/XAudio2_7Stream.h"
#include "AudioCommon/XAudio2Stream.h"

#include "Common/FileUtil.h"

#include "Core/ConfigManager.h"
#include "Core/Movie.h"

// This shouldn't be a global, at least not here.
SoundStream* g_sound_stream = nullptr;

static bool s_audio_dump_start = false;

namespace AudioCommon
{
	static const int AUDIO_VOLUME_MIN = 0;
	static const int AUDIO_VOLUME_MAX = 100;

	SoundStream* InitSoundStream()
	{
		std::string backend = SConfig::GetInstance().sBackend;
		if (backend == BACKEND_OPENAL && OpenALStream::isValid())
			g_sound_stream = new OpenALStream();
		else if (backend == BACKEND_NULLSOUND && NullSound::isValid())
			g_sound_stream = new NullSound();
		else if (backend == BACKEND_XAUDIO2)
		{
			if (XAudio2::isValid())
				g_sound_stream = new XAudio2();
			else if (XAudio2_7::isValid())
				g_sound_stream = new XAudio2_7();
		}
		else if (backend == BACKEND_AOSOUND && AOSound::isValid())
			g_sound_stream = new AOSound();
		else if (backend == BACKEND_ALSA && AlsaSound::isValid())
			g_sound_stream = new AlsaSound();
		else if (backend == BACKEND_COREAUDIO && CoreAudioSound::isValid())
			g_sound_stream = new CoreAudioSound();
		else if (backend == BACKEND_PULSEAUDIO && PulseAudio::isValid())
			g_sound_stream = new PulseAudio();
		else if (backend == BACKEND_OPENSLES && OpenSLESStream::isValid())
			g_sound_stream = new OpenSLESStream();

		if (!g_sound_stream && NullSound::isValid())
		{
			WARN_LOG(AUDIO, "Could not initialize backend %s, using %s instead.",
				backend.c_str(), BACKEND_NULLSOUND);
			g_sound_stream = new NullSound();
		}

		if (g_sound_stream)
		{
			UpdateSoundStream();
			if (!g_sound_stream->Start())
			{
				ERROR_LOG(AUDIO, "Could not start backend %s, using %s instead",
					  backend.c_str(), BACKEND_NULLSOUND);
				delete g_sound_stream;
				g_sound_stream = new NullSound();
				g_sound_stream->Start();
			}

			if (SConfig::GetInstance().m_DumpAudio && !s_audio_dump_start)
				StartAudioDump();

			return g_sound_stream;
		}

		PanicAlertT("Sound backend %s is not valid.", backend.c_str());

		delete g_sound_stream;
		g_sound_stream = nullptr;
		return nullptr;
	}

	void ShutdownSoundStream()
	{
		INFO_LOG(AUDIO, "Shutting down sound stream");

		if (g_sound_stream)
		{
			g_sound_stream->Stop();
			if (SConfig::GetInstance().m_DumpAudio && s_audio_dump_start)
				StopAudioDump();
			delete g_sound_stream;
			g_sound_stream = nullptr;
		}

		INFO_LOG(AUDIO, "Done shutting down sound stream");
	}

	std::vector<std::string> GetSoundBackends()
	{
		std::vector<std::string> backends;

		if (NullSound::isValid())
			backends.push_back(BACKEND_NULLSOUND);
		if (XAudio2_7::isValid() || XAudio2::isValid())
			backends.push_back(BACKEND_XAUDIO2);
		if (AOSound::isValid())
			backends.push_back(BACKEND_AOSOUND);
		if (AlsaSound::isValid())
			backends.push_back(BACKEND_ALSA);
		if (CoreAudioSound::isValid())
			backends.push_back(BACKEND_COREAUDIO);
		if (PulseAudio::isValid())
			backends.push_back(BACKEND_PULSEAUDIO);
		if (OpenALStream::isValid())
			backends.push_back(BACKEND_OPENAL);
		if (OpenSLESStream::isValid())
			backends.push_back(BACKEND_OPENSLES);
		return backends;
	}

	void UpdateSoundStream()
	{
		if (g_sound_stream)
		{
			int volume = SConfig::GetInstance().m_IsMuted ? 0 : SConfig::GetInstance().m_Volume;
			g_sound_stream->SetVolume(volume);
		}
	}

	void ClearAudioBuffer(bool mute)
	{
		if (g_sound_stream)
			g_sound_stream->Clear(mute);
	}

	void SendAIBuffer(short *samples, unsigned int num_samples)
	{
		if (!g_sound_stream)
			return;

		if (SConfig::GetInstance().m_DumpAudio && !s_audio_dump_start)
			StartAudioDump();
		else if (!SConfig::GetInstance().m_DumpAudio && s_audio_dump_start)
			StopAudioDump();

		CMixer* pMixer = g_sound_stream->GetMixer();

		if (pMixer && samples)
		{
			pMixer->PushSamples(samples, num_samples);
		}

		g_sound_stream->Update();
	}

	void StartAudioDump()
	{
		std::string audio_file_name_dtk = File::GetUserPath(D_DUMPAUDIO_IDX) + "dtkdump.wav";
		std::string audio_file_name_dsp = File::GetUserPath(D_DUMPAUDIO_IDX) + "dspdump.wav";
		File::CreateFullPath(audio_file_name_dtk);
		File::CreateFullPath(audio_file_name_dsp);
		g_sound_stream->GetMixer()->StartLogDTKAudio(audio_file_name_dtk);
		g_sound_stream->GetMixer()->StartLogDSPAudio(audio_file_name_dsp);
		s_audio_dump_start = true;
	}

	void StopAudioDump()
	{
		g_sound_stream->GetMixer()->StopLogDTKAudio();
		g_sound_stream->GetMixer()->StopLogDSPAudio();
		s_audio_dump_start = false;
	}

	void IncreaseVolume(unsigned short offset)
	{
		SConfig::GetInstance().m_IsMuted = false;
		int& currentVolume = SConfig::GetInstance().m_Volume;
		currentVolume += offset;
		if (currentVolume > AUDIO_VOLUME_MAX)
			currentVolume = AUDIO_VOLUME_MAX;
		UpdateSoundStream();
	}

	void DecreaseVolume(unsigned short offset)
	{
		SConfig::GetInstance().m_IsMuted = false;
		int& currentVolume = SConfig::GetInstance().m_Volume;
		currentVolume -= offset;
		if (currentVolume < AUDIO_VOLUME_MIN)
			currentVolume = AUDIO_VOLUME_MIN;
		UpdateSoundStream();
	}

	void ToggleMuteVolume()
	{
		bool& isMuted = SConfig::GetInstance().m_IsMuted;
		isMuted = !isMuted;
		UpdateSoundStream();
	}
}