/* id3.cpp */

/* Copyright (C) 2011-2020 Michael Lugmair (Lucio Carreras)
 *
 * This file is part of sayonara player
 *
 * 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/>.
 */

#include "Tagging.h"
#include "Tagging/TaggingCover.h"
#include "Tagging/TaggingExtraFields.h"
#include "Tagging/TaggingUtils.h"
#include "Tagging/Models/Discnumber.h"
#include "Tagging/Models/Popularimeter.h"

#include "Utils/Algorithm.h"
#include "Utils/Utils.h"
#include "Utils/FileUtils.h"
#include "Utils/MetaData/MetaData.h"
#include "Utils/Logger/Logger.h"

#include <QFileInfo>
#include <QRegExp>
#include <QStringList>
#include <QDateTime>

using namespace Tagging::Utils;
namespace FileUtils = ::Util::File;

namespace
{
	struct ReadingProperties
	{
		TagLib::AudioProperties::ReadStyle readStyle {TagLib::AudioProperties::ReadStyle::Fast};
		bool readAudioProperties {true};
	};

	ReadingProperties getReadingProperties(Tagging::Quality quality)
	{
		ReadingProperties readingProperties;

		switch(quality)
		{
			case Tagging::Quality::Quality:
				readingProperties.readStyle = TagLib::AudioProperties::Accurate;
				break;
			case Tagging::Quality::Standard:
				readingProperties.readStyle = TagLib::AudioProperties::Average;
				break;
			case Tagging::Quality::Fast:
				readingProperties.readStyle = TagLib::AudioProperties::Fast;
				break;
			case Tagging::Quality::Dirty:
				readingProperties.readStyle = TagLib::AudioProperties::Fast;
				readingProperties.readAudioProperties = false;
				break;
		};

		return readingProperties;
	}

	QString getTitleFromFilename(const QString& filepath)
	{
		const auto filename = FileUtils::getFilenameOfPath(filepath);
		return (filename.size() > 4)
		       ? filename.left(filename.length() - 4)
		       : filename;
	}

	void setDate(MetaData& track)
	{
		const auto fileInfo = QFileInfo(track.filepath());
		QDateTime createDate;

#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
		createDate = fileInfo.birthTime();
		if(!createDate.isValid())
		{
			createDate = fileInfo.metadataChangeTime();
		}
#else
		createDate = fileInfo.created();
#endif

		if(!createDate.isValid())
		{
			createDate = fileInfo.lastModified();
		}

		track.setCreatedDate(::Util::dateToInt(createDate));
		track.setModifiedDate(Util::dateToInt(fileInfo.lastModified()));
	}

	QStringList extractGenres(const QString& genreString)
	{
		auto genres = genreString.split(QRegExp(",|/|;"));
		Util::Algorithm::transform(genres, [](const auto& genre) {
			return genre.trimmed();
		});

		genres.removeDuplicates();
		genres.removeAll("");

		return genres;
	}
}

bool Tagging::Utils::getMetaDataOfFile(MetaData& track, Quality quality)
{
	const auto fileInfo = QFileInfo(track.filepath());
	track.setFilesize(static_cast<Filesize>(fileInfo.size()));
	setDate(track);

	if(fileInfo.size() <= 0)
	{
		return false;
	}

	const auto readingProperties = getReadingProperties(quality);
	auto fileRef = TagLib::FileRef(TagLib::FileName(track.filepath().toUtf8()),
	                                     readingProperties.readAudioProperties,
	                                     readingProperties.readStyle);

	if(!isValidFile(fileRef))
	{
		spLog(Log::Warning, "Tagging") << "Cannot open tags for " << track.filepath() << ": Err 1";
		return false;
	}

	const auto parsedTag = getParsedTagFromFileRef(fileRef);
	if(!parsedTag.tag)
	{
		return false;
	}

	const auto artist = convertString(parsedTag.tag->artist());
	const auto album = convertString(parsedTag.tag->album());
	const auto title = convertString(parsedTag.tag->title());
	const auto genre = convertString(parsedTag.tag->genre());
	const auto comment = convertString(parsedTag.tag->comment());
	const auto year = parsedTag.tag->year();
	const auto trackNumber = parsedTag.tag->track();
	const auto bitrate = (quality != Quality::Dirty)
	                     ? fileRef.audioProperties()->bitrate() * 1000
	                     : 0;

	const auto length = (quality != Quality::Dirty)
	                    ? fileRef.audioProperties()->length() * 1000
	                    : 0;

	const auto genres = extractGenres(genre);

	track.setAlbum(album);
	track.setArtist(artist);
	track.setTitle(title.isEmpty() ? getTitleFromFilename(track.filepath()) : title);
	track.setDurationMs(length);
	track.setYear(Year(year));
	track.setTrackNumber(static_cast<TrackNum>(trackNumber));
	track.setBitrate(Bitrate(bitrate));
	track.setGenres(genres);
	track.setComment(comment);

	Tagging::readAlbumArtist(track, parsedTag);
	Tagging::readDiscnumber(track, parsedTag);
	Tagging::readPopularimeter(track, parsedTag);

	const auto hasCover = static_cast<int>(Tagging::hasCover(parsedTag));
	track.addCustomField("has-album-art", "", QString::number(hasCover));

	return true;
}

bool Tagging::Utils::setMetaDataOfFile(const MetaData& md)
{
	const auto filepath = md.filepath();
	const auto fileInfo = QFileInfo(filepath);
	if(fileInfo.size() <= 0)
	{
		return false;
	}

	auto fileRef = TagLib::FileRef(TagLib::FileName(filepath.toUtf8()));
	if(!isValidFile(fileRef))
	{
		spLog(Log::Warning, "Tagging") << "Cannot open tags for " << md.filepath() << ": Err 2";
		return false;
	}

	const auto album = convertString(md.album());
	const auto artist = convertString(md.artist());
	const auto title = convertString(md.title());
	const auto genre = convertString(md.genresToString());
	const auto comment = convertString(md.comment());

	const auto parsedTag = getParsedTagFromFileRef(fileRef);
	if(!parsedTag.tag)
	{
		return false;
	}

	parsedTag.tag->setAlbum(album);
	parsedTag.tag->setArtist(artist);
	parsedTag.tag->setTitle(title);
	parsedTag.tag->setGenre(genre);
	parsedTag.tag->setYear(md.year());
	parsedTag.tag->setTrack(md.trackNumber());
	parsedTag.tag->setComment(comment);

	Tagging::writePopularimeter(parsedTag, Models::Popularimeter("sayonara player", md.rating(), 0));
	Tagging::writeDiscnumber(parsedTag, Models::Discnumber(md.discnumber(), md.discCount()));
	Tagging::writeAlbumArtist(parsedTag, md.albumArtist());

	const auto success = fileRef.save();
	if(!success)
	{
		spLog(Log::Warning, "Tagging") << "Could not save " << md.filepath();
	}

	return success;
}