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/* Copyright 2013 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 "OneSixInstance.h"
#include "OneSixInstance_p.h"
#include "OneSixUpdate.h"
#include "MinecraftProcess.h"
#include "OneSixVersion.h"
#include "JavaChecker.h"

#include <setting.h>
#include <pathutils.h>
#include <cmdutils.h>
#include <JlCompress.h>
#include "gui/dialogs/OneSixModEditDialog.h"
#include "logger/QsLog.h"
#include "logic/assets/AssetsUtils.h"

OneSixInstance::OneSixInstance(const QString &rootDir, SettingsObject *setting_obj,
							   QObject *parent)
	: BaseInstance(new OneSixInstancePrivate(), rootDir, setting_obj, parent)
{
	I_D(OneSixInstance);
	d->m_settings->registerSetting(new Setting("IntendedVersion", ""));
	d->m_settings->registerSetting(new Setting("ShouldUpdate", false));
	reloadFullVersion();
}

std::shared_ptr<Task> OneSixInstance::doUpdate(bool only_prepare)
{
	return std::shared_ptr<Task> (new OneSixUpdate(this, only_prepare));
}

QString replaceTokensIn(QString text, QMap<QString, QString> with)
{
	QString result;
	QRegExp token_regexp("\\$\\{(.+)\\}");
	token_regexp.setMinimal(true);
	QStringList list;
	int tail = 0;
	int head = 0;
	while ((head = token_regexp.indexIn(text, head)) != -1)
	{
		result.append(text.mid(tail, head - tail));
		QString key = token_regexp.cap(1);
		auto iter = with.find(key);
		if (iter != with.end())
		{
			result.append(*iter);
		}
		head += token_regexp.matchedLength();
		tail = head;
	}
	result.append(text.mid(tail));
	return result;
}

QDir OneSixInstance::reconstructAssets(std::shared_ptr<OneSixVersion> version)
{
	QDir assetsDir = QDir("assets/");
	QDir indexDir = QDir(PathCombine(assetsDir.path(), "indexes"));
	QDir objectDir = QDir(PathCombine(assetsDir.path(), "objects"));
	QDir virtualDir = QDir(PathCombine(assetsDir.path(), "virtual"));

	QString indexPath = PathCombine(indexDir.path(), version->assets + ".json");
	QFile indexFile(indexPath);
	QDir virtualRoot(PathCombine(virtualDir.path(), version->assets));

	if(!indexFile.exists())
	{
		QLOG_ERROR() << "No assets index file" << indexPath << "; can't reconstruct assets";
		return virtualRoot;
	}

	QLOG_DEBUG() << "reconstructAssets" << assetsDir.path() << indexDir.path() << objectDir.path() << virtualDir.path() << virtualRoot.path();

	AssetsIndex index;
	bool loadAssetsIndex = AssetsUtils::loadAssetsIndexJson(indexPath, &index);

	if(loadAssetsIndex)
	{
		if(index.isVirtual)
		{
			QLOG_INFO() << "Reconstructing virtual assets folder at" << virtualRoot.path();

			for(QString map : index.objects.keys())
			{
				AssetObject asset_object = index.objects.value(map);
				QString target_path = PathCombine(virtualRoot.path(), map);
				QFile target(target_path);

				QString tlk = asset_object.hash.left(2);

				QString original_path = PathCombine(PathCombine(objectDir.path(), tlk), asset_object.hash);
				QFile original(original_path);
				if(!target.exists())
				{
					QFileInfo info(target_path);
					QDir target_dir = info.dir();
					//QLOG_DEBUG() << target_dir;
					if(!target_dir.exists()) QDir("").mkpath(target_dir.path());

					bool couldCopy = original.copy(target_path);
					QLOG_DEBUG() << " Copying" << original_path << "to" << target_path << QString::number(couldCopy);// << original.errorString();
				}
			}

			// TODO: Write last used time to virtualRoot/.lastused
		}
	}

	return virtualRoot;
}

QStringList OneSixInstance::processMinecraftArgs(MojangAccountPtr account)
{
	I_D(OneSixInstance);
	auto version = d->version;
	QString args_pattern = version->minecraftArguments;

	QMap<QString, QString> token_mapping;
	// yggdrasil!
	token_mapping["auth_username"] = account->username();
	token_mapping["auth_session"] = account->sessionId();
	token_mapping["auth_access_token"] = account->accessToken();
	token_mapping["auth_player_name"] = account->currentProfile()->name;
	token_mapping["auth_uuid"] = account->currentProfile()->id;

	// this is for offline?:
	/*
	map["auth_player_name"] = "Player";
	map["auth_player_name"] = "00000000-0000-0000-0000-000000000000";
	*/

	// these do nothing and are stupid.
	token_mapping["profile_name"] = name();
	token_mapping["version_name"] = version->id;

	QString absRootDir = QDir(minecraftRoot()).absolutePath();
	token_mapping["game_directory"] = absRootDir;
	QString absAssetsDir = QDir("assets/").absolutePath();
	token_mapping["game_assets"] = reconstructAssets(d->version).absolutePath();

	auto user = account->user();
	QJsonObject userAttrs;
	for(auto key: user.properties.keys())
	{
		auto array = QJsonArray::fromStringList(user.properties.values(key));
		userAttrs.insert(key, array);
	}
	QJsonDocument value(userAttrs);

	token_mapping["user_properties"] = value.toJson(QJsonDocument::Compact);
	token_mapping["user_type"] = account->currentProfile()->legacy ? "legacy" : "mojang";
	// 1.7.3+ assets tokens
	token_mapping["assets_root"] = absAssetsDir;
	token_mapping["assets_index_name"] = version->assets;

	QStringList parts = args_pattern.split(' ', QString::SkipEmptyParts);
	for (int i = 0; i < parts.length(); i++)
	{
		parts[i] = replaceTokensIn(parts[i], token_mapping);
	}
	return parts;
}

MinecraftProcess *OneSixInstance::prepareForLaunch(MojangAccountPtr account)
{
	I_D(OneSixInstance);

	QString natives_dir_raw = PathCombine(instanceRoot(), "natives/");

	auto version = d->version;
	if (!version)
		return nullptr;

	QStringList args;
	args.append(Util::Commandline::splitArgs(settings().get("JvmArgs").toString()));
	args << QString("-Xms%1m").arg(settings().get("MinMemAlloc").toInt());
	args << QString("-Xmx%1m").arg(settings().get("MaxMemAlloc").toInt());
	args << QString("-XX:PermSize=%1m").arg(settings().get("PermGen").toInt());

/**
 * HACK: Stupid hack for Intel drivers.
 * See: https://mojang.atlassian.net/browse/MCL-767
 */
#ifdef Q_OS_WIN32
	args << QString("-XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_"
					"minecraft.exe.heapdump");
#endif

	QDir natives_dir(natives_dir_raw);
	args << QString("-Djava.library.path=%1").arg(natives_dir.absolutePath());
	QString classPath;
	{
		auto libs = version->getActiveNormalLibs();
		for (auto lib : libs)
		{
			QFileInfo fi(QString("libraries/") + lib->storagePath());
			classPath.append(fi.absoluteFilePath());
#ifdef Q_OS_WIN32
			classPath.append(';');
#else
			classPath.append(':');
#endif
		}
		QString targetstr = "versions/" + version->id + "/" + version->id + ".jar";
		QFileInfo fi(targetstr);
		classPath.append(fi.absoluteFilePath());
	}
	if (classPath.size())
	{
		args << "-cp";
		args << classPath;
	}
	args << version->mainClass;
	args.append(processMinecraftArgs(account));

	// Set the width and height for 1.6 instances
	bool maximize = settings().get("LaunchMaximized").toBool();
	if (maximize)
	{
		// this is probably a BAD idea
		// args << QString("--fullscreen");
	}
	else
	{
		args << QString("--width") << settings().get("MinecraftWinWidth").toString();
		args << QString("--height") << settings().get("MinecraftWinHeight").toString();
	}

	// create the process and set its parameters
	MinecraftProcess *proc = new MinecraftProcess(this);
	proc->setArguments(args);
	proc->setWorkdir(minecraftRoot());
	return proc;
}

void OneSixInstance::cleanupAfterRun()
{
	QString target_dir = PathCombine(instanceRoot(), "natives/");
	QDir dir(target_dir);
	dir.removeRecursively();
}

std::shared_ptr<ModList> OneSixInstance::loaderModList()
{
	I_D(OneSixInstance);
	if (!d->loader_mod_list)
	{
		d->loader_mod_list.reset(new ModList(loaderModsDir()));
	}
	d->loader_mod_list->update();
	return d->loader_mod_list;
}

std::shared_ptr<ModList> OneSixInstance::resourcePackList()
{
	I_D(OneSixInstance);
	if (!d->resource_pack_list)
	{
		d->resource_pack_list.reset(new ModList(resourcePacksDir()));
	}
	d->resource_pack_list->update();
	return d->resource_pack_list;
}

QDialog *OneSixInstance::createModEditDialog(QWidget *parent)
{
	return new OneSixModEditDialog(this, parent);
}

bool OneSixInstance::setIntendedVersionId(QString version)
{
	settings().set("IntendedVersion", version);
	setShouldUpdate(true);
	auto pathCustom = PathCombine(instanceRoot(), "custom.json");
	auto pathOrig = PathCombine(instanceRoot(), "version.json");
	QFile::remove(pathCustom);
	QFile::remove(pathOrig);
	reloadFullVersion();
	return true;
}

QString OneSixInstance::intendedVersionId() const
{
	return settings().get("IntendedVersion").toString();
}

void OneSixInstance::setShouldUpdate(bool val)
{
	settings().set("ShouldUpdate", val);
}

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

bool OneSixInstance::versionIsCustom()
{
	QString verpath_custom = PathCombine(instanceRoot(), "custom.json");
	QFile versionfile(verpath_custom);
	return versionfile.exists();
}

QString OneSixInstance::currentVersionId() const
{
	return intendedVersionId();
}

bool OneSixInstance::customizeVersion()
{
	if (!versionIsCustom())
	{
		auto pathCustom = PathCombine(instanceRoot(), "custom.json");
		auto pathOrig = PathCombine(instanceRoot(), "version.json");
		QFile::copy(pathOrig, pathCustom);
		return reloadFullVersion();
	}
	else
		return true;
}

bool OneSixInstance::revertCustomVersion()
{
	if (versionIsCustom())
	{
		auto path = PathCombine(instanceRoot(), "custom.json");
		QFile::remove(path);
		return reloadFullVersion();
	}
	else
		return true;
}

bool OneSixInstance::reloadFullVersion()
{
	I_D(OneSixInstance);

	QString verpath = PathCombine(instanceRoot(), "version.json");
	{
		QString verpath_custom = PathCombine(instanceRoot(), "custom.json");
		QFile versionfile(verpath_custom);
		if (versionfile.exists())
			verpath = verpath_custom;
	}

	auto version = OneSixVersion::fromFile(verpath);
	if (version)
	{
		d->version = version;
		return true;
	}
	else
	{
		d->version.reset();
		return false;
	}
}

std::shared_ptr<OneSixVersion> OneSixInstance::getFullVersion()
{
	I_D(OneSixInstance);
	return d->version;
}

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

QString OneSixInstance::defaultCustomBaseJar() const
{
	return PathCombine(instanceRoot(), "custom.jar");
}

bool OneSixInstance::menuActionEnabled(QString action_name) const
{
	if (action_name == "actionChangeInstLWJGLVersion")
		return false;
	return true;
}

QString OneSixInstance::getStatusbarDescription()
{
	QString descr = "One Six : " + intendedVersionId();
	if (versionIsCustom())
	{
		descr + " (custom)";
	}
	return descr;
}

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

QString OneSixInstance::resourcePacksDir() const
{
	return PathCombine(minecraftRoot(), "resourcepacks");
}

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