///////////////////////////////////////////////////////////////////////////////
// LameXP - Audio Encoder Front-End
// Copyright (C) 2004-2016 LoRd_MuldeR <MuldeR2@GMX.de>
//
// 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, but always including the *additional*
// restrictions defined in the "License.txt" file.
//
// 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, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// http://www.gnu.org/licenses/gpl-2.0.txt
///////////////////////////////////////////////////////////////////////////////

#include "Thread_FileAnalyzer_Task.h"

//Internal
#include "Global.h"
#include "LockedFile.h"
#include "Model_AudioFile.h"
#include "MimeTypes.h"

//MUtils
#include <MUtils/Global.h>
#include <MUtils/OSSupport.h>
#include <MUtils/Exception.h>

//Qt
#include <QDir>
#include <QFileInfo>
#include <QProcess>
#include <QDate>
#include <QTime>
#include <QDebug>
#include <QImage>
#include <QReadLocker>
#include <QWriteLocker>
#include <QThread>


//CRT
#include <math.h>
#include <time.h>
#include <assert.h>

#define IS_KEY(KEY) (key.compare(KEY, Qt::CaseInsensitive) == 0)
#define IS_SEC(SEC) (key.startsWith((SEC "_"), Qt::CaseInsensitive))
#define FIRST_TOK(STR) (STR.split(" ", QString::SkipEmptyParts).first())

////////////////////////////////////////////////////////////
// Constructor
////////////////////////////////////////////////////////////

AnalyzeTask::AnalyzeTask(const int taskId, const QString &inputFile, const QString &templateFile, volatile bool *abortFlag)
:
	m_taskId(taskId),
	m_inputFile(inputFile),
	m_templateFile(templateFile),
	m_mediaInfoBin(lamexp_tools_lookup("mediainfo.exe")),
	m_avs2wavBin(lamexp_tools_lookup("avs2wav.exe")),
	m_abortFlag(abortFlag)
{
	if(m_mediaInfoBin.isEmpty() || m_avs2wavBin.isEmpty())
	{
		qFatal("Invalid path to MediaInfo binary. Tool not initialized properly.");
	}
}

AnalyzeTask::~AnalyzeTask(void)
{
	emit taskCompleted(m_taskId);
}

////////////////////////////////////////////////////////////
// Thread Main
////////////////////////////////////////////////////////////

void AnalyzeTask::run()
{
	try
	{
		run_ex();
	}
	catch(const std::exception &error)
	{
		MUTILS_PRINT_ERROR("\nGURU MEDITATION !!!\n\nException error:\n%s\n", error.what());
		MUtils::OS::fatal_exit(L"Unhandeled C++ exception error, application will exit!");
	}
	catch(...)
	{
		MUTILS_PRINT_ERROR("\nGURU MEDITATION !!!\n\nUnknown exception error!\n");
		MUtils::OS::fatal_exit(L"Unhandeled C++ exception error, application will exit!");
	}
}

void AnalyzeTask::run_ex(void)
{
	int fileType = fileTypeNormal;
	QString currentFile = QDir::fromNativeSeparators(m_inputFile);
	qDebug("Analyzing: %s", MUTILS_UTF8(currentFile));
	
	AudioFileModel file = analyzeFile(currentFile, &fileType);

	if(*m_abortFlag)
	{
		qWarning("Operation cancelled by user!");
		return;
	}

	switch(fileType)
	{
	case fileTypeDenied:
		qWarning("Cannot access file for reading, skipping!");
		break;
	case fileTypeCDDA:
		qWarning("Dummy CDDA file detected, skipping!");
		break;
	default:
		if(file.metaInfo().title().isEmpty() || file.techInfo().containerType().isEmpty() || file.techInfo().audioType().isEmpty())
		{
			fileType = fileTypeUnknown;
			if(!QFileInfo(currentFile).suffix().compare("cue", Qt::CaseInsensitive))
			{
				qWarning("Cue Sheet file detected, skipping!");
				fileType = fileTypeCueSheet;
			}
			else if(!QFileInfo(currentFile).suffix().compare("avs", Qt::CaseInsensitive))
			{
				qDebug("Found a potential Avisynth script, investigating...");
				if(analyzeAvisynthFile(currentFile, file))
				{
					fileType = fileTypeNormal;
				}
				else
				{
					qDebug("Rejected Avisynth file: %s", MUTILS_UTF8(file.filePath()));
				}
			}
			else
			{
				qDebug("Rejected file of unknown type: %s", MUTILS_UTF8(file.filePath()));
			}
		}
		break;
	}

	//Emit the file now!
	emit fileAnalyzed(m_taskId, fileType, file);
}

////////////////////////////////////////////////////////////
// Privtae Functions
////////////////////////////////////////////////////////////

const AudioFileModel AnalyzeTask::analyzeFile(const QString &filePath, int *type)
{
	*type = fileTypeNormal;
	AudioFileModel audioFile(filePath);

	QFile readTest(filePath);
	if(!readTest.open(QIODevice::ReadOnly))
	{
		*type = fileTypeDenied;
		return audioFile;
	}
	if(checkFile_CDDA(readTest))
	{
		*type = fileTypeCDDA;
		return audioFile;
	}
	readTest.close();

	bool skipNext = false;
	QPair<quint32, quint32> id_val(UINT_MAX, UINT_MAX);
	quint32 coverType = UINT_MAX;
	QByteArray coverData;

	QStringList params;
	params << QString("--Inform=file://%1").arg(QDir::toNativeSeparators(m_templateFile));
	params << QDir::toNativeSeparators(filePath);
	
	QProcess process;
	MUtils::init_process(process, QFileInfo(m_mediaInfoBin).absolutePath());

	process.start(m_mediaInfoBin, params);
		
	if(!process.waitForStarted())
	{
		qWarning("MediaInfo process failed to create!");
		qWarning("Error message: \"%s\"\n", process.errorString().toLatin1().constData());
		process.kill();
		process.waitForFinished(-1);
		return audioFile;
	}

	while(process.state() != QProcess::NotRunning)
	{
		if(*m_abortFlag)
		{
			process.kill();
			qWarning("Process was aborted on user request!");
			break;
		}
		
		if(!process.waitForReadyRead())
		{
			if(process.state() == QProcess::Running)
			{
				qWarning("MediaInfo time out. Killing process and skipping file!");
				process.kill();
				process.waitForFinished(-1);
				return audioFile;
			}
		}

		QByteArray data;

		while(process.canReadLine())
		{
			QString line = QString::fromUtf8(process.readLine().constData()).simplified();
			if(!line.isEmpty())
			{
				//qDebug("Line:%s", MUTILS_UTF8(line));
				
				int index = line.indexOf('=');
				if(index > 0)
				{
					QString key = line.left(index).trimmed();
					QString val = line.mid(index+1).trimmed();
					if(!key.isEmpty())
					{
						updateInfo(audioFile, skipNext, id_val, coverType, coverData, key, val);
					}
				}
			}
		}
	}

	if(audioFile.metaInfo().title().isEmpty())
	{
		QString baseName = QFileInfo(filePath).fileName();
		int index = baseName.lastIndexOf(".");

		if(index >= 0)
		{
			baseName = baseName.left(index);
		}

		baseName = baseName.replace("_", " ").simplified();
		index = baseName.lastIndexOf(" - ");

		if(index >= 0)
		{
			baseName = baseName.mid(index + 3).trimmed();
		}

		audioFile.metaInfo().setTitle(baseName);
	}
	
	process.waitForFinished();
	if(process.state() != QProcess::NotRunning)
	{
		process.kill();
		process.waitForFinished(-1);
	}

	if((coverType != UINT_MAX) && (!coverData.isEmpty()))
	{
		retrieveCover(audioFile, coverType, coverData);
	}

	if((audioFile.techInfo().audioType().compare("PCM", Qt::CaseInsensitive) == 0) && (audioFile.techInfo().audioProfile().compare("Float", Qt::CaseInsensitive) == 0))
	{
		if(audioFile.techInfo().audioBitdepth() == 32) audioFile.techInfo().setAudioBitdepth(AudioFileModel::BITDEPTH_IEEE_FLOAT32);
	}

	return audioFile;
}

void AnalyzeTask::updateInfo(AudioFileModel &audioFile, bool &skipNext, QPair<quint32, quint32> &id_val, quint32 &coverType, QByteArray &coverData, const QString &key, const QString &value)
{
	//qWarning("'%s' -> '%s'", MUTILS_UTF8(key), MUTILS_UTF8(value));
	
	/*New Stream*/
	if(IS_KEY("Gen_ID") || IS_KEY("Aud_ID"))
	{
		if(value.isEmpty())
		{
			skipNext = false;
		}
		else
		{
			//We ignore all ID's, except for the lowest one!
			bool ok = false;
			unsigned int id = value.toUInt(&ok);
			if(ok)
			{
				if(IS_KEY("Gen_ID")) { id_val.first  = qMin(id_val.first,  id); skipNext = (id > id_val.first);  }
				if(IS_KEY("Aud_ID")) { id_val.second = qMin(id_val.second, id); skipNext = (id > id_val.second); }
			}
			else
			{
				skipNext = true;
			}
		}
		if(skipNext)
		{
			qWarning("Skipping info for non-primary stream!");
		}
		return;
	}

	/*Skip or empty?*/
	if((skipNext) || value.isEmpty())
	{
		return;
	}

	/*Playlist file?*/
	if(IS_KEY("Aud_Source"))
	{
		skipNext = true;
		audioFile.techInfo().setContainerType(QString());
		audioFile.techInfo().setAudioType(QString());
		qWarning("Skipping info for playlist file!");
		return;
	}

	/*General Section*/
	if(IS_SEC("Gen"))
	{
		if(IS_KEY("Gen_Format"))
		{
			audioFile.techInfo().setContainerType(value);
		}
		else if(IS_KEY("Gen_Format_Profile"))
		{
			audioFile.techInfo().setContainerProfile(value);
		}
		else if(IS_KEY("Gen_Title") || IS_KEY("Gen_Track"))
		{
			audioFile.metaInfo().setTitle(value);
		}
		else if(IS_KEY("Gen_Duration"))
		{
			unsigned int tmp = parseDuration(value);
			if(tmp > 0) audioFile.techInfo().setDuration(tmp);
		}
		else if(IS_KEY("Gen_Artist") || IS_KEY("Gen_Performer"))
		{
			audioFile.metaInfo().setArtist(value);
		}
		else if(IS_KEY("Gen_Album"))
		{
			audioFile.metaInfo().setAlbum(value);
		}
		else if(IS_KEY("Gen_Genre"))
		{
			audioFile.metaInfo().setGenre(value);
		}
		else if(IS_KEY("Gen_Released_Date") || IS_KEY("Gen_Recorded_Date"))
		{
			unsigned int tmp = parseYear(value);
			if(tmp > 0) audioFile.metaInfo().setYear(tmp);
		}
		else if(IS_KEY("Gen_Comment"))
		{
			audioFile.metaInfo().setComment(value);
		}
		else if(IS_KEY("Gen_Track/Position"))
		{
			bool ok = false;
			unsigned int tmp = value.toUInt(&ok);
			if(ok) audioFile.metaInfo().setPosition(tmp);
		}
		else if(IS_KEY("Gen_Cover") || IS_KEY("Gen_Cover_Type"))
		{
			if(coverType == UINT_MAX)
			{
				coverType = 0;
			}
		}
		else if(IS_KEY("Gen_Cover_Mime"))
		{
			QString temp = FIRST_TOK(value);
			for (quint32 i = 0; MIME_TYPES[i].type; i++)
			{
				if (temp.compare(QString::fromLatin1(MIME_TYPES[i].type), Qt::CaseInsensitive) == 0)
				{
					coverType = i;
					break;
				}
			}
		}
		else if(IS_KEY("Gen_Cover_Data"))
		{
			if(!coverData.isEmpty()) coverData.clear();
			coverData.append(QByteArray::fromBase64(FIRST_TOK(value).toLatin1()));
		}
		else
		{
			qWarning("Unknown key '%s' with value '%s' found!", MUTILS_UTF8(key), MUTILS_UTF8(value));
		}
		return;
	}

	/*Audio Section*/
	if(IS_SEC("Aud"))
	{

		if(IS_KEY("Aud_Format"))
		{
			audioFile.techInfo().setAudioType(value);
		}
		else if(IS_KEY("Aud_Format_Profile"))
		{
			audioFile.techInfo().setAudioProfile(value);
		}
		else if(IS_KEY("Aud_Format_Version"))
		{
			audioFile.techInfo().setAudioVersion(value);
		}
		else if(IS_KEY("Aud_Channel(s)"))
		{
			bool ok = false;
			unsigned int tmp = value.toUInt(&ok);
			if(ok) audioFile.techInfo().setAudioChannels(tmp);
		}
		else if(IS_KEY("Aud_SamplingRate"))
		{
			bool ok = false;
			unsigned int tmp = value.toUInt(&ok);
			if(ok) audioFile.techInfo().setAudioSamplerate(tmp);
		}
		else if(IS_KEY("Aud_BitDepth"))
		{
			bool ok = false;
			unsigned int tmp = value.toUInt(&ok);
			if(ok) audioFile.techInfo().setAudioBitdepth(tmp);
		}
		else if(IS_KEY("Aud_Duration"))
		{
			unsigned int tmp = parseDuration(value);
			if(tmp > 0) audioFile.techInfo().setDuration(tmp);
		}
		else if(IS_KEY("Aud_BitRate"))
		{
			bool ok = false;
			unsigned int tmp = value.toUInt(&ok);
			if(ok) audioFile.techInfo().setAudioBitrate(tmp/1000);
		}
		else if(IS_KEY("Aud_BitRate_Mode"))
		{
			if(!value.compare("CBR", Qt::CaseInsensitive)) audioFile.techInfo().setAudioBitrateMode(AudioFileModel::BitrateModeConstant);
			if(!value.compare("VBR", Qt::CaseInsensitive)) audioFile.techInfo().setAudioBitrateMode(AudioFileModel::BitrateModeVariable);
		}
		else if(IS_KEY("Aud_Encoded_Library"))
		{
			audioFile.techInfo().setAudioEncodeLib(value);
		}
		else
		{
			qWarning("Unknown key '%s' with value '%s' found!", MUTILS_UTF8(key), MUTILS_UTF8(value));
		}
		return;
	}

	/*Section not recognized*/
	qWarning("Unknown section: %s", MUTILS_UTF8(key));
}

bool AnalyzeTask::checkFile_CDDA(QFile &file)
{
	file.reset();
	QByteArray data = file.read(128);
	
	int i = data.indexOf("RIFF");
	int j = data.indexOf("CDDA");
	int k = data.indexOf("fmt ");

	return ((i >= 0) && (j >= 0) && (k >= 0) && (k > j) && (j > i));
}

void AnalyzeTask::retrieveCover(AudioFileModel &audioFile, const quint32 coverType, const QByteArray &coverData)
{
	qDebug("Retrieving cover! (MIME_TYPES_MAX=%u)", MIME_TYPES_MAX);
	
	static const QString ext = QString::fromLatin1(MIME_TYPES[qBound(0U, coverType, MIME_TYPES_MAX)].ext[0]);
	if(!(QImage::fromData(coverData, ext.toUpper().toLatin1().constData()).isNull()))
	{
		QFile coverFile(QString("%1/%2.%3").arg(MUtils::temp_folder(), MUtils::rand_str(), ext));
		if(coverFile.open(QIODevice::WriteOnly))
		{
			coverFile.write(coverData);
			coverFile.close();
			audioFile.metaInfo().setCover(coverFile.fileName(), true);
		}
	}
	else
	{
		qWarning("Image data seems to be invalid :-(");
	}
}

bool AnalyzeTask::analyzeAvisynthFile(const QString &filePath, AudioFileModel &info)
{
	QProcess process;
	MUtils::init_process(process, QFileInfo(m_avs2wavBin).absolutePath());

	process.start(m_avs2wavBin, QStringList() << QDir::toNativeSeparators(filePath) << "?");

	if(!process.waitForStarted())
	{
		qWarning("AVS2WAV process failed to create!");
		qWarning("Error message: \"%s\"\n", process.errorString().toLatin1().constData());
		process.kill();
		process.waitForFinished(-1);
		return false;
	}

	bool bInfoHeaderFound = false;

	while(process.state() != QProcess::NotRunning)
	{
		if(*m_abortFlag)
		{
			process.kill();
			qWarning("Process was aborted on user request!");
			break;
		}
		
		if(!process.waitForReadyRead())
		{
			if(process.state() == QProcess::Running)
			{
				qWarning("AVS2WAV time out. Killing process and skipping file!");
				process.kill();
				process.waitForFinished(-1);
				return false;
			}
		}

		QByteArray data;

		while(process.canReadLine())
		{
			QString line = QString::fromUtf8(process.readLine().constData()).simplified();
			if(!line.isEmpty())
			{
				int index = line.indexOf(':');
				if(index > 0)
				{
					QString key = line.left(index).trimmed();
					QString val = line.mid(index+1).trimmed();

					if(bInfoHeaderFound && !key.isEmpty() && !val.isEmpty())
					{
						if(key.compare("TotalSeconds", Qt::CaseInsensitive) == 0)
						{
							bool ok = false;
							unsigned int duration = val.toUInt(&ok);
							if(ok) info.techInfo().setDuration(duration);
						}
						if(key.compare("SamplesPerSec", Qt::CaseInsensitive) == 0)
						{
							bool ok = false;
							unsigned int samplerate = val.toUInt(&ok);
							if(ok) info.techInfo().setAudioSamplerate (samplerate);
						}
						if(key.compare("Channels", Qt::CaseInsensitive) == 0)
						{
							bool ok = false;
							unsigned int channels = val.toUInt(&ok);
							if(ok) info.techInfo().setAudioChannels(channels);
						}
						if(key.compare("BitsPerSample", Qt::CaseInsensitive) == 0)
						{
							bool ok = false;
							unsigned int bitdepth = val.toUInt(&ok);
							if(ok) info.techInfo().setAudioBitdepth(bitdepth);
						}
					}
				}
				else
				{
					if(line.contains("[Audio Info]", Qt::CaseInsensitive))
					{
						info.techInfo().setAudioType("Avisynth");
						info.techInfo().setContainerType("Avisynth");
						bInfoHeaderFound = true;
					}
				}
			}
		}
	}
	
	process.waitForFinished();
	if(process.state() != QProcess::NotRunning)
	{
		process.kill();
		process.waitForFinished(-1);
	}

	//Check exit code
	switch(process.exitCode())
	{
	case 0:
		qDebug("Avisynth script was analyzed successfully.");
		return true;
		break;
	case -5:
		qWarning("It appears that Avisynth is not installed on the system!");
		return false;
		break;
	default:
		qWarning("Failed to open the Avisynth script, bad AVS file?");
		return false;
		break;
	}
}

unsigned int AnalyzeTask::parseYear(const QString &str)
{
	if(str.startsWith("UTC", Qt::CaseInsensitive))
	{
		QDate date = QDate::fromString(str.mid(3).trimmed().left(10), "yyyy-MM-dd");
		if(date.isValid())
		{
			return date.year();
		}
		else
		{
			return 0;
		}
	}
	else
	{
		bool ok = false;
		int year = str.toInt(&ok);
		if(ok && year > 0)
		{
			return year;
		}
		else
		{
			return 0;
		}
	}
}

unsigned int AnalyzeTask::parseDuration(const QString &str)
{
	bool ok = false;
	unsigned int value = str.toUInt(&ok);
	return ok ? (value/1000) : 0;
}


////////////////////////////////////////////////////////////
// Public Functions
////////////////////////////////////////////////////////////

/*NONE*/

////////////////////////////////////////////////////////////
// EVENTS
////////////////////////////////////////////////////////////

/*NONE*/