/* FileOperations.cpp */

/* Copyright (C) 2011-2024 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 "FileOperations.h"
#include "FileOperationWorkerThread.h"

#include "Components/Library/LocalLibrary.h"
#include "Components/LibraryManagement/LibraryManager.h"
#include "Components/Tagging/ChangeNotifier.h"
#include "Database/Connector.h"
#include "Database/LibraryDatabase.h"
#include "Utils/FileUtils.h"
#include "Utils/Library/LibraryInfo.h"
#include "Utils/Logger/Logger.h"
#include "Utils/MetaData/MetaDataList.h"
#include "Utils/Tagging/Tagging.h"
#include "Utils/Utils.h"

#include <QStringList>

namespace
{
	void refreshLibraries(Library::InfoAccessor* libraryInfoAccessor, const QList<LibraryId>& libraries)
	{
		for(const auto& id: libraries)
		{
			auto* library = libraryInfoAccessor->libraryInstance(id);
			if(library)
			{
				library->refetch();
			}
		}
	}

	QString replaceTag(const QString& expression, const MetaData& track)
	{
		QString ret(expression);
		ret.replace("<title>", track.title());
		ret.replace("<album>", track.album());
		ret.replace("<artist>", track.artist());
		ret.replace("<year>", QString::number(track.year()));
		ret.replace("<bitrate>", QString::number(track.bitrate() / 1000)); // NOLINT(readability-magic-numbers)

		auto trackNrString = QString::number(track.trackNumber());
		if(track.trackNumber() < 10) // NOLINT(readability-magic-numbers)
		{
			trackNrString.prepend("0");
		}

		ret.replace("<tracknum>", trackNrString);
		ret.replace("<disc>", QString::number(int(track.discnumber())));

		return ret;
	}

	QString incrementFilename(const QString& filename)
	{
		if(!Util::File::exists(filename))
		{
			return filename;
		}

		auto [dir, pureFilename] = Util::File::splitFilename(filename);
		const auto extension = Util::File::getFileExtension(filename);

		for(int i = 1; i < 1000; i++) // NOLINT(readability-magic-numbers)
		{
			const auto pureNewName = QString("%1-%2").arg(pureFilename).arg(i);
			const auto fullNewName = QString("%1/%2.%3").arg(dir).arg(pureNewName).arg(extension);
			if(!Util::File::exists(fullNewName))
			{
				return Util::File::cleanFilename(fullNewName);
			}
		}

		return {};
	}
}

struct FileOperations::Private
{
	Library::InfoAccessor* libraryInfoAccessor;

	explicit Private(Library::InfoAccessor* libraryInfoAccessor) :
		libraryInfoAccessor {libraryInfoAccessor} {}
};

FileOperations::FileOperations(Library::InfoAccessor* libraryInfoAccessor, QObject* parent) :
	QObject(parent),
	m {Pimpl::make<Private>(libraryInfoAccessor)} {}

FileOperations::~FileOperations() = default;

bool FileOperations::renamePath(const QString& path, const QString& newName)
{
	auto* t = new FileRenameThread(m->libraryInfoAccessor, path, newName, this);

	connect(t, &QThread::started, this, &FileOperations::sigStarted);
	connect(t, &QThread::finished, this, &FileOperations::moveThreadFinished);

	t->start();

	return true;
}

bool FileOperations::movePaths(const QStringList& paths, const QString& targetDir)
{
	auto* t = new FileMoveThread(m->libraryInfoAccessor, paths, targetDir, this);

	connect(t, &QThread::started, this, &FileOperations::sigStarted);
	connect(t, &QThread::finished, this, &FileOperations::moveThreadFinished);

	t->start();

	return true;
}

void FileOperations::moveThreadFinished()
{
	auto* thread = dynamic_cast<FileOperationThread*>(sender());

	refreshLibraries(m->libraryInfoAccessor, thread->sourceIds());
	refreshLibraries(m->libraryInfoAccessor, thread->targetIds());

	thread->deleteLater();
	emit sigFinished();
}

bool FileOperations::copyPaths(const QStringList& paths, const QString& targetDir)
{
	auto* t = new FileCopyThread(m->libraryInfoAccessor, paths, targetDir, this);

	connect(t, &QThread::started, this, &FileOperations::sigStarted);
	connect(t, &QThread::finished, this, &FileOperations::copyThreadFinished);

	t->start();

	return true;
}

void FileOperations::copyThreadFinished()
{
	auto* thread = dynamic_cast<FileOperationThread*>(sender());
	refreshLibraries(m->libraryInfoAccessor, thread->targetIds());

	thread->deleteLater();
	emit sigFinished();
}

bool FileOperations::deletePaths(const QStringList& paths)
{
	spLog(Log::Info, this) << "Try to delete " << paths;

	auto* t = new FileDeleteThread(m->libraryInfoAccessor, paths, this);
	connect(t, &QThread::started, this, &FileOperations::sigStarted);
	connect(t, &QThread::finished, this, &FileOperations::deleteThreadFinished);

	t->start();

	return true;
}

void FileOperations::deleteThreadFinished()
{
	auto* thread = dynamic_cast<FileOperationThread*>(sender());
	refreshLibraries(m->libraryInfoAccessor, thread->sourceIds());

	thread->deleteLater();
	emit sigFinished();
}

QStringList FileOperations::supportedReplacementTags()
{
	return {"<title>", "<album>", "<artist>", "<year>", "<bitrate>", "<tracknum>", "<disc>"};
}

bool FileOperations::renameByExpression(const QString& originalFilepath, const QString& expression) const
{
	auto* db = DB::Connector::instance();
	auto* libraryDb = db->libraryDatabase(-1);

	auto originalTrack = libraryDb->getTrackByPath(originalFilepath);
	if(originalTrack.id() < 0)
	{
		Tagging::Utils::getMetaDataOfFile(originalTrack);
	}

	const auto pureFilename = replaceTag(expression, originalTrack);
	if(pureFilename.isEmpty())
	{
		spLog(Log::Error, this) << "Target filename is empty";
		return false;
	}

	if(pureFilename.contains("<") || pureFilename.contains(">"))
	{
		spLog(Log::Error, this) << "<, > are not allowed. Maybe an invalid tag was specified?";
		return false;
	}

	const auto dir = Util::File::getParentDirectory(originalTrack.filepath());
	const auto ext = Util::File::getFileExtension(originalTrack.filepath());

	auto fullNewName = QString("%1/%2.%3").arg(dir).arg(pureFilename).arg(ext);
	fullNewName = incrementFilename(fullNewName);

	if(originalTrack.id() < 0)
	{
		return Util::File::renameFile(fullNewName, originalFilepath); // NOLINT(readability-suspicious-call-argument)
	}

	auto success = Util::File::renameFile(originalFilepath, fullNewName);
	if(success)
	{
		auto newTrack = originalTrack;
		newTrack.setFilepath(fullNewName);

		success = libraryDb->updateTrack(newTrack);
		if(!success)
		{
			Util::File::renameFile(fullNewName, originalFilepath); // NOLINT(readability-suspicious-call-argument)
		}

		else
		{
			auto* changeNotifier = Tagging::ChangeNotifier::instance();
			changeNotifier->changeMetadata(
				QList<MetaDataPair> {MetaDataPair(originalTrack, newTrack)});
		}
	}

	return success;

}
