/* Copyright 2013-2017 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <QFileInfo>
#include <minecraft/launch/LauncherPartLaunch.h>
#include <QDir>
#include <settings/Setting.h>

#include "LegacyInstance.h"

#include "minecraft/legacy/LegacyModList.h"
#include "minecraft/ModList.h"
#include "minecraft/WorldList.h"
#include <MMCZip.h>
#include <FileSystem.h>

LegacyInstance::LegacyInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir)
	: BaseInstance(globalSettings, settings, rootDir)
{
	settings->registerSetting("NeedsRebuild", true);
	settings->registerSetting("ShouldUpdate", false);
	settings->registerSetting("JarVersion", QString());
	settings->registerSetting("IntendedJarVersion", QString());
	/*
	 * custom base jar has no default. it is determined in code... see the accessor methods for
	 *it
	 *
	 * for instances that DO NOT have the CustomBaseJar setting (legacy instances),
	 * [.]minecraft/bin/mcbackup.jar is the default base jar
	 */
	settings->registerSetting("UseCustomBaseJar", true);
	settings->registerSetting("CustomBaseJar", "");
}

QString LegacyInstance::baseJar() const
{
	bool customJar = m_settings->get("UseCustomBaseJar").toBool();
	if (customJar)
	{
		return customBaseJar();
	}
	else
		return defaultBaseJar();
}

QString LegacyInstance::customBaseJar() const
{
	QString value = m_settings->get("CustomBaseJar").toString();
	if (value.isNull() || value.isEmpty())
	{
		return defaultCustomBaseJar();
	}
	return value;
}

bool LegacyInstance::shouldUseCustomBaseJar() const
{
	return m_settings->get("UseCustomBaseJar").toBool();
}


shared_qobject_ptr<Task> LegacyInstance::createUpdateTask(Net::Mode)
{
	return nullptr;
}

/*
class LegacyJarModTask : public Task
{
	//Q_OBJECT
public:
	explicit LegacyJarModTask(std::shared_ptr<LegacyInstance> inst) : Task(nullptr), m_inst(inst)
	{
	}
	virtual void executeTask()
	{
		if (!m_inst->shouldRebuild())
		{
			emitSucceeded();
			return;
		}

		// Get the mod list
		auto modList = m_inst->getJarMods();

		QFileInfo runnableJar(m_inst->runnableJar());
		QFileInfo baseJar(m_inst->baseJar());
		bool base_is_custom = m_inst->shouldUseCustomBaseJar();

		// Nothing to do if there are no jar mods to install, no backup and just the mc jar
		if (base_is_custom)
		{
			// yes, this can happen if the instance only has the runnable jar and not the base jar
			// it *could* be assumed that such an instance is vanilla, but that wouldn't be safe
			// because that's not something mmc4 guarantees
			if (runnableJar.isFile() && !baseJar.exists() && modList.empty())
			{
				m_inst->setShouldRebuild(false);
				emitSucceeded();
				return;
			}

			setStatus(tr("Installing mods: Backing up minecraft.jar ..."));
			if (!baseJar.exists() && !QFile::copy(runnableJar.filePath(), baseJar.filePath()))
			{
				emitFailed("It seems both the active and base jar are gone. A fresh base jar will "
						"be used on next run.");
				m_inst->setShouldRebuild(true);
				m_inst->setShouldUpdate(true);
				m_inst->setShouldUseCustomBaseJar(false);
				return;
			}
		}

		if (!baseJar.exists())
		{
			emitFailed("The base jar " + baseJar.filePath() + " does not exist");
			return;
		}

		if (runnableJar.exists() && !QFile::remove(runnableJar.filePath()))
		{
			emitFailed("Failed to delete old minecraft.jar");
			return;
		}

		setStatus(tr("Installing mods: Opening minecraft.jar ..."));

		QString outputJarPath = runnableJar.filePath();
		QString inputJarPath = baseJar.filePath();

		if(!MMCZip::createModdedJar(inputJarPath, outputJarPath, modList))
		{
			emitFailed(tr("Failed to create the custom Minecraft jar file."));
			return;
		}
		m_inst->setShouldRebuild(false);
		// inst->UpdateVersion(true);
		emitSucceeded();
		return;

	}
	std::shared_ptr<LegacyInstance> m_inst;
};
*/

std::shared_ptr<LegacyModList> LegacyInstance::jarModList() const
{
	if (!jar_mod_list)
	{
		auto list = new LegacyModList(jarModsDir(), modListFile());
		jar_mod_list.reset(list);
	}
	jar_mod_list->update();
	return jar_mod_list;
}

QList<Mod> LegacyInstance::getJarMods() const
{
	return jarModList()->allMods();
}

QString LegacyInstance::minecraftRoot() const
{
	QFileInfo mcDir(FS::PathCombine(instanceRoot(), "minecraft"));
	QFileInfo dotMCDir(FS::PathCombine(instanceRoot(), ".minecraft"));

	if (mcDir.exists() && !dotMCDir.exists())
		return mcDir.filePath();
	else
		return dotMCDir.filePath();
}

QString LegacyInstance::binRoot() const
{
	return FS::PathCombine(minecraftRoot(), "bin");
}

QString LegacyInstance::jarModsDir() const
{
	return FS::PathCombine(instanceRoot(), "instMods");
}

QString LegacyInstance::libDir() const
{
	return FS::PathCombine(minecraftRoot(), "lib");
}

QString LegacyInstance::savesDir() const
{
	return FS::PathCombine(minecraftRoot(), "saves");
}

QString LegacyInstance::loaderModsDir() const
{
	return FS::PathCombine(minecraftRoot(), "mods");
}

QString LegacyInstance::coreModsDir() const
{
	return FS::PathCombine(minecraftRoot(), "coremods");
}

QString LegacyInstance::resourceDir() const
{
	return FS::PathCombine(minecraftRoot(), "resources");
}
QString LegacyInstance::texturePacksDir() const
{
	return FS::PathCombine(minecraftRoot(), "texturepacks");
}

QString LegacyInstance::runnableJar() const
{
	return FS::PathCombine(binRoot(), "minecraft.jar");
}

QString LegacyInstance::modListFile() const
{
	return FS::PathCombine(instanceRoot(), "modlist");
}

QString LegacyInstance::instanceConfigFolder() const
{
	return FS::PathCombine(minecraftRoot(), "config");
}

bool LegacyInstance::shouldRebuild() const
{
	return m_settings->get("NeedsRebuild").toBool();
}

QString LegacyInstance::currentVersionId() const
{
	return m_settings->get("JarVersion").toString();
}

QString LegacyInstance::intendedVersionId() const
{
	return m_settings->get("IntendedJarVersion").toString();
}

bool LegacyInstance::shouldUpdate() const
{
	QVariant var = settings()->get("ShouldUpdate");
	if (!var.isValid() || var.toBool() == false)
	{
		return intendedVersionId() != currentVersionId();
	}
	return true;
}

QString LegacyInstance::defaultBaseJar() const
{
	return "versions/" + intendedVersionId() + "/" + intendedVersionId() + ".jar";
}

QString LegacyInstance::defaultCustomBaseJar() const
{
	return FS::PathCombine(binRoot(), "mcbackup.jar");
}

std::shared_ptr<WorldList> LegacyInstance::worldList() const
{
	if (!m_world_list)
	{
		m_world_list.reset(new WorldList(savesDir()));
	}
	return m_world_list;
}

QString LegacyInstance::typeName() const
{
	return tr("Legacy");
}

QString LegacyInstance::getStatusbarDescription()
{
	return tr("Instance from previous versions.");
}

QStringList LegacyInstance::verboseDescription(AuthSessionPtr session)
{
	QStringList out;

	auto alltraits = traits();
	if(alltraits.size())
	{
		out << "Traits:";
		for (auto trait : alltraits)
		{
			out << "  " + trait;
		}
		out << "";
	}

	QString windowParams;
	if (settings()->get("LaunchMaximized").toBool())
	{
		out << "Window size: max (if available)";
	}
	else
	{
		auto width = settings()->get("MinecraftWinWidth").toInt();
		auto height = settings()->get("MinecraftWinHeight").toInt();
		out << "Window size: " + QString::number(width) + " x " + QString::number(height);
	}
	out << "";
	return out;
}