pollymc/logic/InstanceFactory.cpp

/* Copyright 2013-2015 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 <QDir>
#include <QFileInfo>

#include "logic/settings/INIFile.h"
#include "logic/settings/INISettingsObject.h"
#include "logic/settings/Setting.h"

#include <pathutils.h>
#include "logger/QsLog.h"

#include "logic/InstanceFactory.h"

#include "logic/BaseInstance.h"
#include "logic/LegacyInstance.h"
#include "logic/OneSixInstance.h"
#include "logic/OneSixInstance.h"
#include "logic/BaseVersion.h"
#include "logic/minecraft/MinecraftVersion.h"

InstanceFactory InstanceFactory::loader;

InstanceFactory::InstanceFactory() : QObject(NULL)
{
}

InstanceFactory::InstLoadError InstanceFactory::loadInstance(InstancePtr &inst,
															 const QString &instDir)
{
	auto m_settings = new INISettingsObject(PathCombine(instDir, "instance.cfg"));

	m_settings->registerSetting("InstanceType", "Legacy");

	QString inst_type = m_settings->get("InstanceType").toString();

	// FIXME: replace with a map lookup, where instance classes register their types
	if (inst_type == "OneSix" || inst_type == "Nostalgia")
	{
		inst.reset(new OneSixInstance(instDir, m_settings));
	}
	else if (inst_type == "Legacy")
	{
		inst.reset(new LegacyInstance(instDir, m_settings));
	}
	else
	{
		return InstanceFactory::UnknownLoadError;
	}
	inst->init();
	return NoLoadError;
}

InstanceFactory::InstCreateError
InstanceFactory::createInstance(InstancePtr &inst, BaseVersionPtr version, const QString &instDir)
{
	QDir rootDir(instDir);

	QLOG_DEBUG() << instDir.toUtf8();
	if (!rootDir.exists() && !rootDir.mkpath("."))
	{
		QLOG_ERROR() << "Can't create instance folder" << instDir;
		return InstanceFactory::CantCreateDir;
	}

	if (!version)
	{
		QLOG_ERROR() << "Can't create instance for non-existing MC version";
		return InstanceFactory::NoSuchVersion;
	}

	auto m_settings = new INISettingsObject(PathCombine(instDir, "instance.cfg"));
	m_settings->registerSetting("InstanceType", "Legacy");

	auto minecraftVersion = std::dynamic_pointer_cast<MinecraftVersion>(version);
	if(minecraftVersion)
	{
		auto mcVer = std::dynamic_pointer_cast<MinecraftVersion>(version);
		m_settings->set("InstanceType", "OneSix");
		inst.reset(new OneSixInstance(instDir, m_settings));
		inst->setIntendedVersionId(version->descriptor());
		inst->init();
		return InstanceFactory::NoCreateError;
	}
	delete m_settings;
	return InstanceFactory::NoSuchVersion;
}

InstanceFactory::InstCreateError InstanceFactory::copyInstance(InstancePtr &newInstance,
															   InstancePtr &oldInstance,
															   const QString &instDir)
{
	QDir rootDir(instDir);

	QLOG_DEBUG() << instDir.toUtf8();
	if (!copyPath(oldInstance->instanceRoot(), instDir))
	{
		rootDir.removeRecursively();
		return InstanceFactory::CantCreateDir;
	}

	INISettingsObject settings_obj(PathCombine(instDir, "instance.cfg"));
	settings_obj.registerSetting("InstanceType", "Legacy");
	QString inst_type = settings_obj.get("InstanceType").toString();

	oldInstance->copy(instDir);

	auto error = loadInstance(newInstance, instDir);

	switch (error)
	{
	case NoLoadError:
		return NoCreateError;
	case NotAnInstance:
		rootDir.removeRecursively();
		return CantCreateDir;
	default:
	case UnknownLoadError:
		rootDir.removeRecursively();
		return UnknownCreateError;
	}
}