#include "LegacyUpdate.h"
#include "lists/LwjglVersionList.h"
#include "lists/MinecraftVersionList.h"
#include "BaseInstance.h"
#include "LegacyInstance.h"
#include "MultiMC.h"
#include "ModList.h"
#include <pathutils.h>
#include <quazip.h>
#include <quazipfile.h>
#include <JlCompress.h>


LegacyUpdate::LegacyUpdate ( BaseInstance* inst, QObject* parent ) : BaseUpdate ( inst, parent ) {}

void LegacyUpdate::executeTask()
{
	lwjglStart();
}

void LegacyUpdate::lwjglStart()
{
	LegacyInstance * inst = (LegacyInstance *) m_inst;

	lwjglVersion =  inst->lwjglVersion();
	lwjglTargetPath = PathCombine("lwjgl", lwjglVersion );
	lwjglNativesPath = PathCombine( lwjglTargetPath, "natives");
	
	// if the 'done' file exists, we don't have to download this again
	QFileInfo doneFile(PathCombine(lwjglTargetPath, "done"));
	if(doneFile.exists())
	{
		jarStart();
		return;
	}
	
	auto &list = LWJGLVersionList::get();
	if(!list.isLoaded())
	{
		emitFailed("Too soon! Let the LWJGL list load :)");
		return;
	}
	
	setStatus("Downloading new LWJGL.");
	auto version = list.getVersion(lwjglVersion);
	if(!version)
	{
		emitFailed("Game update failed: the selected LWJGL version is invalid.");
		return;
	}
	
	QString url = version->url();
	QUrl realUrl(url);
	QString hostname = realUrl.host();
	auto worker = MMC->qnam();
	QNetworkRequest req(realUrl);
	req.setRawHeader("Host", hostname.toLatin1());
	req.setHeader(QNetworkRequest::UserAgentHeader, "Wget/1.14 (linux-gnu)");
	QNetworkReply * rep = worker->get ( req );
	
	m_reply = QSharedPointer<QNetworkReply> (rep, &QObject::deleteLater);
	connect(rep, SIGNAL(downloadProgress(qint64,qint64)), SLOT(updateDownloadProgress(qint64,qint64)));
	connect(worker, SIGNAL(finished(QNetworkReply*)), SLOT(lwjglFinished(QNetworkReply*)));
	//connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), SLOT(downloadError(QNetworkReply::NetworkError)));
}

void LegacyUpdate::lwjglFinished(QNetworkReply* reply)
{
	if(m_reply != reply)
	{
		return;
	}
	if(reply->error() != QNetworkReply::NoError)
	{
		emitFailed( "Failed to download: "+
					reply->errorString()+
					"\nSometimes you have to wait a bit if you download many LWJGL versions in a row. YMMV");
		return;
	}
	auto *worker = MMC->qnam();
	//Here i check if there is a cookie for me in the reply and extract it
	QList<QNetworkCookie> cookies = qvariant_cast<QList<QNetworkCookie>>(reply->header(QNetworkRequest::SetCookieHeader));
	if(cookies.count() != 0)
	{
		//you must tell which cookie goes with which url
		worker->cookieJar()->setCookiesFromUrl(cookies, QUrl("sourceforge.net"));
	}

	//here you can check for the 302 or whatever other header i need
	QVariant newLoc = reply->header(QNetworkRequest::LocationHeader);
	if(newLoc.isValid())
	{
		QString redirectedTo = reply->header(QNetworkRequest::LocationHeader).toString();
		QUrl realUrl(redirectedTo);
		QString hostname = realUrl.host();
		QNetworkRequest req(redirectedTo);
		req.setRawHeader("Host", hostname.toLatin1());
		req.setHeader(QNetworkRequest::UserAgentHeader, "Wget/1.14 (linux-gnu)");
		QNetworkReply * rep = worker->get(req);
		connect(rep, SIGNAL(downloadProgress(qint64,qint64)), SLOT(updateDownloadProgress(qint64,qint64)));
		m_reply = QSharedPointer<QNetworkReply> (rep, &QObject::deleteLater);
		return;
	}
	QFile saveMe("lwjgl.zip");
	saveMe.open(QIODevice::WriteOnly);
	saveMe.write(m_reply->readAll());
	saveMe.close();
	setStatus("Installing new LWJGL...");
	extractLwjgl();
	jarStart();
}
void LegacyUpdate::extractLwjgl()
{
	// make sure the directories are there

	bool success = ensureFolderPathExists(lwjglNativesPath);
	
	if(!success)
	{
		emitFailed("Failed to extract the lwjgl libs - error when creating required folders.");
		return;
	}
	
	QuaZip zip("lwjgl.zip");
	if(!zip.open(QuaZip::mdUnzip))
	{
		emitFailed("Failed to extract the lwjgl libs - not a valid archive.");
		return;
	}
	
	// and now we are going to access files inside it
	QuaZipFile file(&zip);
	const QString jarNames[] = { "jinput.jar", "lwjgl_util.jar", "lwjgl.jar" };
	for(bool more=zip.goToFirstFile(); more; more=zip.goToNextFile())
	{
		if(!file.open(QIODevice::ReadOnly))
		{
			zip.close();
			emitFailed("Failed to extract the lwjgl libs - error while reading archive.");
			return;
		}
		QuaZipFileInfo info;
		QString name = file.getActualFileName();
		if(name.endsWith('/'))
		{
			file.close();
			continue;
		}
		QString destFileName;
		// Look for the jars
		for (int i = 0; i < 3; i++)
		{
			if (name.endsWith(jarNames[i]))
			{
				destFileName = PathCombine(lwjglTargetPath, jarNames[i]);
			}
		}
		// Not found? look for the natives
		if(destFileName.isEmpty())
		{
#ifdef Q_OS_WIN32
			QString nativesDir = "windows";
#else
	#ifdef Q_OS_MAC
			QString nativesDir = "macosx";
	#else
			QString nativesDir = "linux";
	#endif
#endif
			if (name.contains(nativesDir))
			{
				int lastSlash = name.lastIndexOf('/');
				int lastBackSlash = name.lastIndexOf('/');
				if(lastSlash != -1)
					name = name.mid(lastSlash+1);
				else if(lastBackSlash != -1)
					name = name.mid(lastBackSlash+1);
				destFileName = PathCombine(lwjglNativesPath, name);
			}
		}
		// Now if destFileName is still empty, go to the next file.
		if (!destFileName.isEmpty())
		{
			setStatus("Installing new LWJGL - Extracting " + name);
			QFile output(destFileName);
			output.open(QIODevice::WriteOnly);
			output.write(file.readAll()); // FIXME: wste of memory!?
			output.close();
		}
		file.close(); // do not forget to close!
	}
	zip.close();
	m_reply.clear();
	QFile doneFile(PathCombine(lwjglTargetPath, "done"));
	doneFile.open(QIODevice::WriteOnly);
	doneFile.write("done.");
	doneFile.close();
}

void LegacyUpdate::lwjglFailed()
{
	emitFailed("Bad stuff happened while trying to get the lwjgl libs...");
}

void LegacyUpdate::jarStart()
{
	LegacyInstance * inst = (LegacyInstance *) m_inst;
	if(!inst->shouldUpdate() || inst->shouldUseCustomBaseJar())
	{
		ModTheJar();
		return;
	}
	
	setStatus("Checking for jar updates...");
	// Make directories
	QDir binDir(inst->binDir());
	if (!binDir.exists() && !binDir.mkpath("."))
	{
		emitFailed("Failed to create bin folder.");
		return;
	}

	// Build a list of URLs that will need to be downloaded.
	setStatus("Downloading new minecraft.jar");

	QString urlstr("http://s3.amazonaws.com/Minecraft.Download/versions/");
	QString intended_version_id = inst->intendedVersionId();
	urlstr += intended_version_id + "/" + intended_version_id + ".jar";
	
	auto dljob = new DownloadJob("Minecraft.jar for version " + intended_version_id);
	dljob->add(QUrl(urlstr), inst->defaultBaseJar());
	legacyDownloadJob.reset(dljob);
	connect(legacyDownloadJob.data(), SIGNAL(finished()), SLOT(jarFinished()));
	connect(legacyDownloadJob.data(), SIGNAL(failed()), SLOT(jarFailed()));
	connect(legacyDownloadJob.data(), SIGNAL(progress(qint64,qint64)), SLOT(updateDownloadProgress(qint64,qint64)));
	legacyDownloadJob->start();
}

void LegacyUpdate::jarFinished()
{
	// process the jar
	ModTheJar();
}

void LegacyUpdate::jarFailed()
{
	// bad, bad
	emitFailed("Failed to download the minecraft jar. Try again later.");
}

bool LegacyUpdate::MergeZipFiles( QuaZip* into, QFileInfo from, QSet< QString >& contained, MetainfAction metainf )
{
	setStatus("Installing mods - Adding " + from.fileName());
	
	QuaZip modZip(from.filePath());
	modZip.open(QuaZip::mdUnzip);
	
	QuaZipFile fileInsideMod(&modZip);
	QuaZipFile zipOutFile( into );
	for(bool more=modZip.goToFirstFile(); more; more=modZip.goToNextFile())
	{
		QString filename = modZip.getCurrentFileName();
		if(filename.contains("META-INF") && metainf == LegacyUpdate::IgnoreMetainf)
		{
			qDebug() << "Skipping META-INF " << filename << " from " << from.fileName();
			continue;
		}
		if(contained.contains(filename))
		{
			qDebug() << "Skipping already contained file " << filename << " from " << from.fileName();
			continue;
		}
		contained.insert(filename);
		qDebug() << "Adding file " << filename << " from " << from.fileName();
		
		if(!fileInsideMod.open(QIODevice::ReadOnly))
		{
			qDebug() << "Failed to open " << filename << " from " << from.fileName();
			return false;
		}
		/*
		QuaZipFileInfo old_info;
		fileInsideMod.getFileInfo(&old_info);
		*/
		QuaZipNewInfo info_out(fileInsideMod.getActualFileName());
		/*
		info_out.externalAttr = old_info.externalAttr;
		*/
		if(!zipOutFile.open(QIODevice::WriteOnly, info_out))
		{
			qDebug() << "Failed to open " << filename << " in the jar";
			fileInsideMod.close();
			return false;
		}
		if(!JlCompress::copyData(fileInsideMod, zipOutFile))
		{
			zipOutFile.close();
			fileInsideMod.close();
			qDebug() << "Failed to copy data of " << filename << " into the jar";
			return false;
		}
		zipOutFile.close();
		fileInsideMod.close();
	}
	return true;
}

void LegacyUpdate::ModTheJar()
{
	LegacyInstance * inst = (LegacyInstance *) m_inst;
	
	if(!inst->shouldRebuild())
	{
		emitSucceeded();
		return;
	}
	
	// Get the mod list
	auto modList = inst->jarModList();
	
	QFileInfo runnableJar (inst->runnableJar());
	QFileInfo baseJar (inst->baseJar());
	bool base_is_custom = 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())
		{
			inst->setShouldRebuild(false);
			emitSucceeded();
			return;
		}
		
		setStatus("Installing mods - backing up minecraft.jar...");
		if (!baseJar.exists() && !QFile::copy(runnableJar.filePath(), baseJar.filePath()))
		{
			emitFailed("Failed to back up minecraft.jar");
			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;
	}
	
	//TaskStep(); // STEP 1
	setStatus("Installing mods - Opening minecraft.jar");

	QuaZip zipOut(runnableJar.filePath());
	if(!zipOut.open(QuaZip::mdCreate))
	{
		QFile::remove(runnableJar.filePath());
		emitFailed("Failed to open the minecraft.jar for modding");
		return;
	}
	// Files already added to the jar.
	// These files will be skipped.
	QSet<QString> addedFiles;

	// Modify the jar
	setStatus("Installing mods - Adding mod files...");
	for (int i = modList->size() - 1; i >= 0; i--)
	{
		auto &mod = modList->operator[](i);
		if (mod.type() == Mod::MOD_ZIPFILE)
		{
			if(!MergeZipFiles(&zipOut, mod.filename(), addedFiles, LegacyUpdate::KeepMetainf))
			{
				zipOut.close();
				QFile::remove(runnableJar.filePath());
				emitFailed("Failed to add " + mod.filename().fileName() + " to the jar.");
				return;
			}
		}
		else if (mod.type() == Mod::MOD_SINGLEFILE)
		{
			auto filename = mod.filename();
			if(!JlCompress::compressFile(&zipOut, filename.absoluteFilePath(), filename.fileName()))
			{
				zipOut.close();
				QFile::remove(runnableJar.filePath());
				emitFailed("Failed to add " + filename.fileName() + " to the jar");
				return;
			}
			addedFiles.insert(filename.fileName());
			qDebug() << "Adding file " << filename.fileName() << " from " << filename.absoluteFilePath();
		}
		else if (mod.type() == Mod::MOD_FOLDER)
		{
			auto filename = mod.filename();
			QString what_to_zip = filename.absoluteFilePath();
			QDir dir(what_to_zip);
			dir.cdUp();
			QString parent_dir = dir.absolutePath();
			if(!JlCompress::compressSubDir(&zipOut, what_to_zip, parent_dir, true, addedFiles))
			{
				zipOut.close();
				QFile::remove(runnableJar.filePath());
				emitFailed("Failed to add " + filename.fileName() + " to the jar");
				return;
			}
			qDebug() << "Adding folder " << filename.fileName() << " from " << filename.absoluteFilePath();
		}
	}
	
	if(!MergeZipFiles(&zipOut, baseJar, addedFiles, LegacyUpdate::IgnoreMetainf))
	{
		zipOut.close();
		QFile::remove(runnableJar.filePath());
		emitFailed("Failed to insert minecraft.jar contents.");
		return;
	}
	
	// Recompress the jar
	zipOut.close();
    if(zipOut.getZipError()!=0)
	{
		QFile::remove(runnableJar.filePath());
		emitFailed("Failed to finalize minecraft.jar!");
		return;
    }
	inst->setShouldRebuild(false);
	//inst->UpdateVersion(true);
	emitSucceeded();
	return;
}