Implement basic game updater.

Resolves MMC-4: https://jira.forkk.net/browse/MMC-4

17 files changed, 598 insertions, 97 deletions

diff --git a/gui/mainwindow.cpp b/gui/mainwindow.cpp
index 22055b51..47753b37 100644
--- a/gui/mainwindow.cpp
+++ b/gui/mainwindow.cpp
@@ -50,7 +50,9 @@
 #include "version.h"
 
 #include "logintask.h"
-#include <instance.h>
+#include "gameupdatetask.h"
+
+#include "instance.h"
 #include "minecraftprocess.h"
 
 #include "instancemodel.h"
@@ -68,6 +70,10 @@ MainWindow::MainWindow ( QWidget *parent ) :
 	instList ( globalSettings->get ( "InstanceDir" ).toString() )
 {
 	ui->setupUi ( this );
+	
+	// Set active instance to null.
+	m_activeInst = NULL;
+	
 	// Create the widget
 	view = new KCategorizedView ( ui->centralWidget );
 	drawer = new KCategoryDrawer ( view );
@@ -149,7 +155,7 @@ void MainWindow::instanceActivated ( QModelIndex index )
 	if(!index.isValid())
 		return;
 	Instance * inst = (Instance *) index.data(InstanceModel::InstancePointerRole).value<void *>();
-	doLogin(inst->id());
+	doLogin();
 }
 
 void MainWindow::on_actionAddInstance_triggered()
@@ -313,55 +319,86 @@ void MainWindow::on_actionLaunchInstance_triggered()
 	Instance* inst = selectedInstance();
 	if(inst)
 	{
-		doLogin(inst->id());
+		doLogin();
 	}
 }
 
-void MainWindow::doLogin ( QString inst, const QString& errorMsg )
+void MainWindow::doLogin(const QString& errorMsg)
 {
-	LoginDialog* loginDlg = new LoginDialog ( this, errorMsg );
-	if ( loginDlg->exec() )
+	if (!selectedInstance())
+		return;
+	
+	LoginDialog* loginDlg = new LoginDialog(this, errorMsg);
+	if (loginDlg->exec())
 	{
-		UserInfo uInfo ( loginDlg->getUsername(), loginDlg->getPassword() );
-
-		TaskDialog* tDialog = new TaskDialog ( this );
-		LoginTask* loginTask = new LoginTask ( uInfo, inst, tDialog );
-		connect ( loginTask, SIGNAL ( loginComplete ( QString, LoginResponse ) ),
-		          SLOT ( onLoginComplete ( QString, LoginResponse ) ), Qt::QueuedConnection );
-		connect ( loginTask, SIGNAL ( loginFailed ( QString, QString ) ),
-		          SLOT ( onLoginFailed( QString, QString ) ), Qt::QueuedConnection );
-		tDialog->exec ( loginTask );
+		UserInfo uInfo(loginDlg->getUsername(), loginDlg->getPassword());
+
+		TaskDialog* tDialog = new TaskDialog(this);
+		LoginTask* loginTask = new LoginTask(uInfo, tDialog);
+		connect(loginTask, SIGNAL(loginComplete(LoginResponse)),
+				SLOT(onLoginComplete(LoginResponse)), Qt::QueuedConnection);
+		connect(loginTask, SIGNAL(loginFailed(QString)),
+				SLOT(doLogin(QString)), Qt::QueuedConnection);
+		m_activeInst = selectedInstance();
+		tDialog->exec(loginTask);
 	}
 }
 
-void MainWindow::onLoginComplete ( QString inst, LoginResponse response )
+void MainWindow::onLoginComplete(LoginResponse response)
 {
-	// TODO: console
-	console = new ConsoleWindow();
-	auto instance = instList.getInstanceById(inst);
-	if(instance)
+	Q_ASSERT_X(m_activeInst != NULL, "onLoginComplete", "no active instance is set");
+	
+	if (!m_activeInst->shouldUpdateGame())
 	{
-		proc = new MinecraftProcess(instance, response.username(), response.sessionID());
-		
-		console->show();
-		//connect(proc, SIGNAL(ended()), SLOT(onTerminated()));
-		connect(proc, SIGNAL(log(QString,MessageLevel::Enum)), console, SLOT(write(QString,MessageLevel::Enum)));
-		proc->launch();
+		launchInstance(m_activeInst, response);
 	}
 	else
 	{
-		
+		TaskDialog *tDialog = new TaskDialog(this);
+		GameUpdateTask *updateTask = new GameUpdateTask(response, m_activeInst);
+		connect(updateTask, SIGNAL(gameUpdateComplete(LoginResponse)), 
+				SLOT(onGameUpdateComplete(LoginResponse)));
+		connect(updateTask, SIGNAL(gameUpdateError(QString)), SLOT(onGameUpdateError(QString)));
+		tDialog->exec(updateTask);
 	}
-	/*
-	QMessageBox::information ( this, "Login Successful",
-	                           QString ( "Logged in as %1 with session ID %2. Instance: %3" ).
-	                           arg ( response.username(), response.sessionID(), inst ) );
-	*/
 }
 
-void MainWindow::onLoginFailed ( QString inst, const QString& errorMsg )
+void MainWindow::onGameUpdateComplete(LoginResponse response)
+{
+	launchInstance(response);
+}
+
+void MainWindow::onGameUpdateError(QString error)
 {
-	doLogin(inst, errorMsg);
+	QMessageBox::warning(this, "Error downloading instance", error);
+}
+
+
+void MainWindow::launchInstance(LoginResponse response)
+{
+	Q_ASSERT_X(m_activeInst != NULL, "onLoginComplete", "no active instance is set");
+	launchInstance(m_activeInst, response);
+}
+
+void MainWindow::launchInstance(QString instID, LoginResponse response)
+{
+	Instance *instance = instList.getInstanceById(instID).data();
+	Q_ASSERT_X(instance != NULL, "launchInstance", "instance ID does not correspond to a valid instance");
+	launchInstance(instance, response);
+}
+
+void MainWindow::launchInstance(Instance *instance, LoginResponse response)
+{
+	Q_ASSERT_X(instance != NULL, "launchInstance", "instance is NULL");
+	
+	console = new ConsoleWindow();
+	proc = new MinecraftProcess(instance, response.username(), response.sessionID());
+	
+	console->show();
+	//connect(proc, SIGNAL(ended()), SLOT(onTerminated()));
+	connect(proc, SIGNAL(log(QString, MessageLevel::Enum)), 
+			console, SLOT(write(QString, MessageLevel::Enum)));
+	proc->launch();
 }
 
 void MainWindow::taskStart(Task *task)
@@ -415,8 +452,7 @@ void MainWindow::on_actionChangeInstMCVersion_triggered()
 	if (view->selectionModel()->selectedIndexes().count() < 1)
 		return;
 	
-	QModelIndex index = view->selectionModel()->selectedIndexes().at(0);
-	Instance *inst = (Instance *)index.data(InstanceModel::InstancePointerRole).value<void *>();
+	Instance *inst = selectedInstance();
 	
 	VersionSelectDialog *vselect = new VersionSelectDialog(inst->versionList(), this);
 	if (vselect->exec() && vselect->selectedVersion())
diff --git a/gui/mainwindow.h b/gui/mainwindow.h
index bc35038e..192cdbc4 100644
--- a/gui/mainwindow.h
+++ b/gui/mainwindow.h
@@ -38,16 +38,21 @@ class MainWindow : public QMainWindow
 {
 	Q_OBJECT
 	
+	/*!
+	 * The currently selected instance.
+	 */
+	Q_PROPERTY(Instance* selectedInstance READ selectedInstance STORED false)
+	
 public:
 	explicit MainWindow(QWidget *parent = 0);
 	~MainWindow();
 	
 	void closeEvent(QCloseEvent *event);
 
-    // Browser Dialog
-    void openWebPage(QUrl url);
-
-private:
+	// Browser Dialog
+	void openWebPage(QUrl url);
+	
+	
 	Instance *selectedInstance();
 	
 private slots:
@@ -82,11 +87,14 @@ private slots:
 	
 	void on_actionChangeInstMCVersion_triggered();
 	
-	void doLogin( QString inst, const QString& errorMsg = "" );
+	void doLogin(const QString& errorMsg = "");
 	
 	
-	void onLoginComplete( QString inst, LoginResponse response );
-	void onLoginFailed( QString inst, const QString& errorMsg );
+	void onLoginComplete(LoginResponse response);
+	
+	
+	void onGameUpdateComplete(LoginResponse response);
+	void onGameUpdateError(QString error);
 	
 	void taskStart(Task *task);
 	void taskEnd(Task *task);
@@ -95,6 +103,10 @@ public slots:
 	void instanceActivated ( QModelIndex );
 	
 	void startTask(Task *task);
+	
+	void launchInstance(LoginResponse response);
+	void launchInstance(QString instID, LoginResponse response);
+	void launchInstance(Instance *inst, LoginResponse response);
 
 private:
 	Ui::MainWindow *ui;
@@ -106,6 +118,11 @@ private:
 	MinecraftProcess *proc;
 	ConsoleWindow *console;
 	
+	// A pointer to the instance we are actively doing stuff with.
+	// This is set when the user launches an instance and is used to refer to that
+	// instance throughout the launching process.
+	Instance *m_activeInst;
+	
 	Task *m_versionLoadTask;
 };
 
diff --git a/libmultimc/include/gameupdatetask.h b/libmultimc/include/gameupdatetask.h
index eabfbd1f..47f6c007 100644
--- a/libmultimc/include/gameupdatetask.h
+++ b/libmultimc/include/gameupdatetask.h
@@ -18,19 +18,105 @@
 
 #include <QObject>
 
+#include <QList>
+
+#include <QNetworkAccessManager>
+#include <QUrl>
+
+#include "task.h"
 #include "loginresponse.h"
+#include "instance.h"
 
 #include "libmmc_config.h"
 
+class FileToDownload : public QObject
+{
+	Q_OBJECT
+	
+	/*!
+	 * The URL to download the file from.
+	 */
+	Q_PROPERTY(QUrl url READ url WRITE setURL)
+	
+	/*!
+	 * The path to download to.
+	 * This path is relative to the instance's root directory.
+	 */
+	Q_PROPERTY(QString path READ path WRITE setPath)
+public:
+	FileToDownload(const QUrl &url, const QString &path, QObject *parent = 0);
+	FileToDownload(const FileToDownload &other);
+	
+	virtual QUrl url() const { return m_dlURL; }
+	virtual void setURL(const QUrl &url) { m_dlURL = url; }
+	
+	virtual QString path() const { return m_dlPath; }
+	virtual void setPath(const QString &path) { m_dlPath = path; }
+	
+private:
+	QUrl m_dlURL;
+	QString m_dlPath;
+};
+
 /*!
- * \brief The game update task is the task that handles downloading instances.
- * Each instance type has its own class inheriting from this base game update task.
+ * The game update task is the task that handles downloading instances' files.
  */
-class LIBMULTIMC_EXPORT GameUpdateTask : public QObject
+class LIBMULTIMC_EXPORT GameUpdateTask : public Task
 {
 	Q_OBJECT
+	
+	/*!
+	 * The task's state.
+	 * A certain state message will be shown depending on what this is set to.
+	 */
+	Q_PROPERTY(int state READ state WRITE setState)
+	
+	/*!
+	 * The substatus message.
+	 * This will be next to the the state message in the task's status.
+	 */
+	Q_PROPERTY(QString subStatus READ subStatus WRITE setSubStatus)
 public:
-	explicit GameUpdateTask(const LoginResponse &response, QObject *parent = 0);
+	explicit GameUpdateTask(const LoginResponse &response, Instance *inst, QObject *parent = 0);
+	
+	
+	/////////////////////////
+	// EXECUTION FUNCTIONS //
+	/////////////////////////
+	
+	virtual void executeTask();
+	
+	virtual bool downloadFile(const FileToDownload &file);
+	
+	
+	//////////////////////
+	// STATE AND STATUS //
+	//////////////////////
+	
+	virtual int state() const;
+	virtual void setState(int state, bool resetSubStatus = true);
+	
+	virtual QString subStatus() const;
+	virtual void setSubStatus(const QString &msg);
+	
+	/*!
+	 * Gets the message that will be displated for the given state.
+	 */
+	virtual QString getStateMessage(int state);
+	
+public slots:
+	
+	/*!
+	 * Updates the status message based on the state and substatus message.
+	 */
+	virtual void updateStatus();
+	
+	
+	virtual void error(const QString &msg);
+	
+	
+private slots:
+	virtual void updateDownloadProgress(qint64 current, qint64 total);
 	
 signals:
 	/*!
@@ -40,13 +126,59 @@ signals:
 	void gameUpdateComplete(const LoginResponse &response);
 	
 	/*!
-	 * \brief Signal emitted if the game update fails.
+	 * \brief Signal emitted if an error occurrs during the update.
 	 * \param errorMsg An error message to be displayed to the user.
 	 */
-	void gameUpdateFailed(const QString &errorMsg);
+	void gameUpdateError(const QString &errorMsg);
 	
 private:
+	///////////
+	// STUFF //
+	///////////
+	
+	Instance *m_inst;
+	
 	LoginResponse m_response;
+	
+	QNetworkAccessManager *netMgr;
+	
+	
+	
+	////////////////////////
+	// FILE DOWNLOAD LIST //
+	////////////////////////
+	
+	// List of URLs that the game updater will need to download.
+	QList<FileToDownload> m_downloadList;
+	int m_currentDownload;
+	
+	
+	
+	////////////////////////////
+	// STATE AND STATUS STUFF //
+	////////////////////////////
+	
+	int m_updateState;
+	QString m_subStatusMsg;
+	
+	enum UpdateState
+	{
+		// Initializing
+		StateInit = 0,
+		
+		// Determining files to download
+		StateDetermineURLs,
+		
+		// Downloading files
+		StateDownloadFiles,
+		
+		// Installing files
+		StateInstall,
+		
+		// Finished
+		StateFinished
+	};
 };
 
+
 #endif // GAMEUPDATETASK_H
diff --git a/libmultimc/include/instance.h b/libmultimc/include/instance.h
index e72a0be3..717f8816 100644
--- a/libmultimc/include/instance.h
+++ b/libmultimc/include/instance.h
@@ -75,6 +75,21 @@ class LIBMULTIMC_EXPORT Instance : public QObject
 	 */
 	Q_PROPERTY(bool shouldRebuild READ shouldRebuild WRITE setShouldRebuild)
 	
+	/*!
+	 * Whether or not Minecraft should be downloaded when the instance is launched.
+	 * This returns true if shouldForceUpdate game is true or if the intended and 
+	 * current versions don't match.
+	 */
+	Q_PROPERTY(bool shouldUpdateGame READ shouldUpdateGame STORED false)
+	
+	/*!
+	 * Whether or not the game will be forced to update on the next launch.
+	 * If this is set to true, shouldUpdateGame will be true, regardless of whether or not
+	 * the current and intended versions match.
+	 * It should be noted that this is set to false automatically when game updates are run.
+	 */
+	Q_PROPERTY(bool shouldForceUpdateGame READ shouldForceUpdateGame WRITE setShouldForceUpdateGame)
+	
 	
 	/*!
 	 * The instance's current version.
@@ -182,7 +197,7 @@ public:
 	//////// INSTANCE INFO ////////
 	
 	//// General Info ////
-	virtual QString name() { return settings().get("name").toString(); }
+	virtual QString name() const { return settings().get("name").toString(); }
 	virtual void setName(QString val)
 	{
 		settings().set("name", val);
@@ -212,27 +227,33 @@ public:
 	
 	//// Version Stuff ////
 	
-	virtual QString currentVersion() { return settings().get("JarVersion").toString(); }
+	virtual QString currentVersion() const { return settings().get("JarVersion").toString(); }
 	virtual void setCurrentVersion(QString val) { settings().set("JarVersion", val); }
 	
-	virtual QString lwjglVersion() { return settings().get("LwjglVersion").toString(); }
+	virtual QString lwjglVersion() const { return settings().get("LwjglVersion").toString(); }
 	virtual void setLWJGLVersion(QString val) { settings().set("LwjglVersion", val); }
 	
-	virtual QString intendedVersion() { return settings().get("IntendedJarVersion").toString(); }
+	virtual QString intendedVersion() const { return settings().get("IntendedJarVersion").toString(); }
 	virtual void setIntendedVersion(QString val) { settings().set("IntendedJarVersion", val); }
 	
+	virtual bool shouldUpdateGame() const 
+	{ return shouldForceUpdateGame() || intendedVersion() != currentVersion(); }
+	
+	virtual bool shouldForceUpdateGame() const { return settings().get("ShouldForceUpdate").toBool(); }
+	virtual void setShouldForceUpdateGame(bool val) { settings().set("ShouldForceUpdate", val); }
+	
 	
 	
 	//// Timestamps ////
 	
-	virtual qint64 lastLaunch() { return settings().get("lastLaunchTime").value<qint64>(); }
+	virtual qint64 lastLaunch() const { return settings().get("lastLaunchTime").value<qint64>(); }
 	virtual void setLastLaunch(qint64 val = QDateTime::currentMSecsSinceEpoch()) 
 	{
 		settings().set("lastLaunchTime", val);
 		emit propertiesChanged(this);
 	}
 	
-	virtual qint64 lastCurrentVersionUpdate() { return settings().get("lastVersionUpdate").value<qint64>(); }
+	virtual qint64 lastCurrentVersionUpdate() const { return settings().get("lastVersionUpdate").value<qint64>(); }
 	virtual void setLastCurrentVersionUpdate(qint64 val) { settings().set("lastVersionUpdate", val); }
 	
 	
@@ -274,7 +295,7 @@ public:
 	 *        stored in the instance config file against the last modified time of Minecraft.jar.
 	 * \return True if updateCurrentVersion() should be called.
 	 */
-	virtual bool shouldUpdateCurrentVersion();
+	virtual bool shouldUpdateCurrentVersion() const;
 	
 	/*!
 	 * \brief Updates the current version. 
diff --git a/libmultimc/include/logintask.h b/libmultimc/include/logintask.h
index e00609ec..15d715bd 100644
--- a/libmultimc/include/logintask.h
+++ b/libmultimc/include/logintask.h
@@ -30,20 +30,19 @@ class LIBMULTIMC_EXPORT LoginTask : public Task
 {
 	Q_OBJECT
 public:
-	explicit LoginTask(const UserInfo& uInfo, QString inst, QObject *parent = 0);
+	explicit LoginTask(const UserInfo& uInfo, QObject *parent = 0);
 	
 public slots:
 	void processNetReply(QNetworkReply* reply);
 	
 signals:
-	void loginComplete(QString inst, LoginResponse loginResponse);
-	void loginFailed(QString inst, const QString& errorMsg);
+	void loginComplete(LoginResponse loginResponse);
+	void loginFailed(const QString& errorMsg);
 	
 protected:
 	void executeTask();
 	
 	QNetworkReply* netReply;
-	QString inst;
 	UserInfo uInfo;
 };
 
diff --git a/libmultimc/include/minecraftprocess.h b/libmultimc/include/minecraftprocess.h
index ac4d6be2..eb861236 100644
--- a/libmultimc/include/minecraftprocess.h
+++ b/libmultimc/include/minecraftprocess.h
@@ -54,7 +54,7 @@ public:
 	 * @param session the minecraft session id
 	 * @param console the instance console window
 	 */
-	MinecraftProcess(InstancePtr inst, QString user, QString session);
+	MinecraftProcess(Instance *inst, QString user, QString session);
 
 	/**
 	 * @brief launch minecraft
@@ -66,7 +66,7 @@ public:
 	 * @param inst the instance
 	 * @param destination the destination path
 	 */
-	static inline void extractIcon(InstancePtr inst, QString destination);
+	static inline void extractIcon(Instance *inst, QString destination);
 
 	/**
 	 * @brief extract the MultiMC launcher.jar
@@ -78,7 +78,7 @@ public:
 	 * @brief prepare the launch by extracting icon and launcher
 	 * @param inst the instance
 	 */
-	static void prepare(InstancePtr inst);
+	static void prepare(Instance *inst);
 
 	/**
 	 * @brief split a string into argv items like a shell would do
@@ -101,7 +101,7 @@ signals:
 	void log(QString text, MessageLevel::Enum level=MessageLevel::MultiMC);
 
 protected:
-	InstancePtr m_instance;
+	Instance *m_instance;
 	QString m_user;
 	QString m_session;
 	QString m_err_leftover;
diff --git a/libmultimc/include/minecraftversion.h b/libmultimc/include/minecraftversion.h
index e30582ac..fd11b316 100644
--- a/libmultimc/include/minecraftversion.h
+++ b/libmultimc/include/minecraftversion.h
@@ -39,6 +39,11 @@ class LIBMULTIMC_EXPORT MinecraftVersion : public InstVersion
 	 */
 	Q_PROPERTY(QString etag READ etag)
 	
+	/*!
+	 * True if this is a version from the new Minecraft launcher's version list.
+	 */
+	Q_PROPERTY(bool isForNewLauncher READ isForNewLauncher WRITE setIsForNewLauncher)
+	
 public:
 	explicit MinecraftVersion(QString descriptor, 
 							  QString name, 
@@ -75,6 +80,9 @@ public:
 	virtual QString typeName() const;
 	virtual qint64 timestamp() const;
 	
+	virtual bool isForNewLauncher() const;
+	virtual void setIsForNewLauncher(bool val);
+	
 	virtual VersionType versionType() const;
 	virtual void setVersionType(VersionType typeName);
 	
@@ -90,6 +98,8 @@ private:
 	QString m_dlUrl;
 	QString m_etag;
 	VersionType m_type;
+	
+	bool m_isNewLauncherVersion;
 };
 
 #endif // MINECRAFTVERSION_H
diff --git a/libmultimc/src/gameupdatetask.cpp b/libmultimc/src/gameupdatetask.cpp
index c152147e..34c8f670 100644
--- a/libmultimc/src/gameupdatetask.cpp
+++ b/libmultimc/src/gameupdatetask.cpp
@@ -15,8 +15,231 @@
 
 #include "gameupdatetask.h"
 
-GameUpdateTask::GameUpdateTask(const LoginResponse &response, QObject *parent) :
-	QObject(parent), m_response(response)
+#include <QtNetwork>
+
+#include <QFile>
+#include <QFileInfo>
+#include <QTextStream>
+#include <QDataStream>
+
+#include <QDebug>
+
+#include "minecraftversionlist.h"
+
+#include "pathutils.h"
+#include "netutils.h"
+
+GameUpdateTask::GameUpdateTask(const LoginResponse &response, Instance *inst, QObject *parent) :
+	Task(parent), m_response(response)
+{
+	m_inst = inst;
+	m_updateState = StateInit;
+	m_currentDownload = 0;
+}
+
+void GameUpdateTask::executeTask()
+{
+	updateStatus();
+	
+	QNetworkAccessManager networkMgr;
+	netMgr = &networkMgr;
+	
+	// Get a pointer to the version object that corresponds to the instance's version.
+	MinecraftVersion *targetVersion = (MinecraftVersion *)MinecraftVersionList::getMainList().
+			findVersion(m_inst->intendedVersion());
+	Q_ASSERT_X(targetVersion != NULL, "game update", "instance's intended version is not an actual version");
+	
+	// Make directories
+	QDir binDir(m_inst->binDir());
+	if (!binDir.exists() && !binDir.mkpath("."))
+	{
+		error("Failed to create bin folder.");
+		return;
+	}
+	
+	
+	
+	/////////////////////////
+	// BUILD DOWNLOAD LIST //
+	/////////////////////////
+	// Build a list of URLs that will need to be downloaded.
+	
+	setState(StateDetermineURLs);
+	
+	
+	// Add the URL for minecraft.jar
+	
+	// This will be either 'minecraft' or the version number, depending on where
+	// we're downloading from.
+	QString jarFilename = "minecraft";
+	
+	if (targetVersion->isForNewLauncher())
+		jarFilename = targetVersion->descriptor();
+	
+	QUrl mcJarURL = targetVersion->downloadURL() + jarFilename + ".jar";
+	qDebug() << mcJarURL.toString();
+	m_downloadList.append(FileToDownload(mcJarURL, PathCombine(m_inst->minecraftDir(), "bin/minecraft.jar")));
+	
+	
+	
+	////////////////////
+	// DOWNLOAD FILES //
+	////////////////////
+	setState(StateDownloadFiles);
+	for (int i = 0; i < m_downloadList.length(); i++)
+	{
+		m_currentDownload = i;
+		if (!downloadFile(m_downloadList[i]))
+			return;
+	}
+	
+	
+	
+	///////////////////
+	// INSTALL FILES //
+	///////////////////
+	setState(StateInstall);
+	
+	// Nothing to do here yet
+	
+	
+	
+	//////////////
+	// FINISHED //
+	//////////////
+	setState(StateFinished);
+	emit gameUpdateComplete(m_response);
+}
+
+bool GameUpdateTask::downloadFile(const FileToDownload &file)
+{
+	setSubStatus("Downloading " + file.url().toString());
+	QNetworkReply *reply = netMgr->get(QNetworkRequest(file.url()));
+	
+	this->connect(reply, SIGNAL(downloadProgress(qint64,qint64)),
+				  SLOT(updateDownloadProgress(qint64,qint64)));
+	
+	NetUtils::waitForNetRequest(reply);
+	
+	if (reply->error() == QNetworkReply::NoError)
+	{
+		QFile outFile = file.path();
+		if (outFile.exists() && !outFile.remove())
+		{
+			error("Can't delete old file " + file.path() + ": " + outFile.errorString());
+			return false;
+		}
+		
+		if (!outFile.open(QIODevice::WriteOnly))
+		{
+			error("Can't write to " + file.path() + ": " + outFile.errorString());
+			return false;
+		}
+		
+		outFile.write(reply->readAll());
+		outFile.close();
+	}
+	else
+	{
+		error("Can't download " + file.url().toString() + ": " + reply->errorString());
+		return false;
+	}
+	
+	// TODO: Check file integrity after downloading.
+	
+	return true;
+}
+
+int GameUpdateTask::state() const
+{
+	return m_updateState;
+}
+
+void GameUpdateTask::setState(int state, bool resetSubStatus)
+{
+	m_updateState = state;
+	if (resetSubStatus)
+		setSubStatus("");
+	else // We only need to update if we're not resetting substatus becasue setSubStatus updates status for us.
+		updateStatus();
+}
+
+QString GameUpdateTask::subStatus() const
+{
+	return m_subStatusMsg;
+}
+
+void GameUpdateTask::setSubStatus(const QString &msg)
+{
+	m_subStatusMsg = msg;
+	updateStatus();
+}
+
+QString GameUpdateTask::getStateMessage(int state)
+{
+	switch (state)
+	{
+	case StateInit:
+		return "Initializing";
+		
+	case StateDetermineURLs:
+		return "Determining files to download";
+		
+	case StateDownloadFiles:
+		return "Downloading files";
+		
+	case StateInstall:
+		return "Installing";
+		
+	case StateFinished:
+		return "Finished";
+	
+	default:
+		return "Downloading instance files";
+	}
+}
+
+void GameUpdateTask::updateStatus()
+{
+	QString newStatus;
+	
+	newStatus = getStateMessage(state());
+	if (!subStatus().isEmpty())
+		newStatus += ": " + subStatus();
+	else
+		newStatus += "...";
+	
+	setStatus(newStatus);
+}
+
+
+void GameUpdateTask::error(const QString &msg)
+{
+	emit gameUpdateError(msg);
+}
+
+void GameUpdateTask::updateDownloadProgress(qint64 current, qint64 total)
+{
+	// The progress on the current file is current / total
+	float currentDLProgress = (float) current / (float) total; // Cast ALL the values!
+	
+	// The overall progress is (current progress + files downloaded) / total files to download
+	float overallDLProgress = ((currentDLProgress + m_currentDownload) / (float) m_downloadList.length());
+	
+	// Multiply by 100 to make it a percentage.
+	setProgress((int)(overallDLProgress * 100));
+}
+
+
+
+FileToDownload::FileToDownload(const QUrl &url, const QString &path, QObject *parent) : 
+	QObject(parent), m_dlURL(url), m_dlPath(path)
+{
+	
+}
+
+FileToDownload::FileToDownload(const FileToDownload &other) :
+	QObject(other.parent()), m_dlURL(other.m_dlURL), m_dlPath(other.m_dlPath)
 {
 	
 }
diff --git a/libmultimc/src/instance.cpp b/libmultimc/src/instance.cpp
index f4a6a3c9..08cd6605 100644
--- a/libmultimc/src/instance.cpp
+++ b/libmultimc/src/instance.cpp
@@ -34,8 +34,9 @@ Instance::Instance(const QString &rootDir, QObject *parent) :
 	settings().registerSetting(new Setting("iconKey", "default"));
 	settings().registerSetting(new Setting("notes", ""));
 	settings().registerSetting(new Setting("NeedsRebuild", true));
+	settings().registerSetting(new Setting("ShouldForceUpdate", false));
 	settings().registerSetting(new Setting("JarVersion", "Unknown"));
-	settings().registerSetting(new Setting("LwjglVersion", "Mojang"));
+	settings().registerSetting(new Setting("LwjglVersion", "2.9.0"));
 	settings().registerSetting(new Setting("IntendedJarVersion", ""));
 	settings().registerSetting(new Setting("lastLaunchTime", 0));
 	
@@ -157,7 +158,7 @@ InstVersionList *Instance::versionList() const
 	return &MinecraftVersionList::getMainList();
 }
 
-bool Instance::shouldUpdateCurrentVersion()
+bool Instance::shouldUpdateCurrentVersion() const
 {
 	QFileInfo jar(mcJar());
 	return jar.lastModified().toUTC().toMSecsSinceEpoch() != lastCurrentVersionUpdate();
diff --git a/libmultimc/src/logintask.cpp b/libmultimc/src/logintask.cpp
index e042a93f..4a55037c 100644
--- a/libmultimc/src/logintask.cpp
+++ b/libmultimc/src/logintask.cpp
@@ -24,8 +24,8 @@
 #include <QUrl>
 #include <QUrlQuery>
 
-LoginTask::LoginTask( const UserInfo& uInfo, QString inst, QObject* parent ) :
-	Task(parent), uInfo(uInfo), inst(inst)
+LoginTask::LoginTask( const UserInfo& uInfo, QObject* parent ) :
+	Task(parent), uInfo(uInfo)
 {
 	
 }
@@ -78,42 +78,42 @@ void LoginTask::processNetReply(QNetworkReply *reply)
 					QString sessionID = strings[3];
 					
 					LoginResponse response(username, sessionID, latestVersion);
-					emit loginComplete(inst, response);
+					emit loginComplete(response);
 				}
 				else
 				{
-					emit loginFailed(inst, "Failed to parse Minecraft version string.");
+					emit loginFailed("Failed to parse Minecraft version string.");
 				}
 			}
 			else
 			{
 				if (responseStr.toLower() == "bad login")
-					emit loginFailed(inst, "Invalid username or password.");
+					emit loginFailed("Invalid username or password.");
 				else if (responseStr.toLower() == "old version")
-					emit loginFailed(inst, "Launcher outdated, please update.");
+					emit loginFailed("Launcher outdated, please update.");
 				else
-					emit loginFailed(inst, "Login failed: " + responseStr);
+					emit loginFailed("Login failed: " + responseStr);
 			}
 		}
 		else if (responseCode == 503)
 		{
-			emit loginFailed(inst, "The login servers are currently unavailable. "
+			emit loginFailed("The login servers are currently unavailable. "
 							 "Check http://help.mojang.com/ for more info.");
 		}
 		else
 		{
-			emit loginFailed(inst, QString("Login failed: Unknown HTTP error %1 occurred.").
+			emit loginFailed(QString("Login failed: Unknown HTTP error %1 occurred.").
 							 arg(QString::number(responseCode)));
 		}
 		break;
 	}
 		
 	case QNetworkReply::OperationCanceledError:
-		emit loginFailed(inst, "Login canceled.");
+		emit loginFailed("Login canceled.");
 		break;
 		
 	default:
-		emit loginFailed(inst, "Login failed: " + reply->errorString());
+		emit loginFailed("Login failed: " + reply->errorString());
 		break;
 	}
 	
diff --git a/libmultimc/src/minecraftprocess.cpp b/libmultimc/src/minecraftprocess.cpp
index f1b63e3d..e8b9959e 100644
--- a/libmultimc/src/minecraftprocess.cpp
+++ b/libmultimc/src/minecraftprocess.cpp
@@ -73,7 +73,7 @@ QStringList MinecraftProcess::splitArgs(QString args)
 }
 
 // prepare tools
-inline void MinecraftProcess::extractIcon(InstancePtr inst, QString destination)
+inline void MinecraftProcess::extractIcon(Instance *inst, QString destination)
 {
 //	QImage(":/icons/instances/" + inst->iconKey()).save(destination);
 }
@@ -83,14 +83,14 @@ inline void MinecraftProcess::extractLauncher(QString destination)
 	QFile(":/launcher/launcher.jar").copy(destination);
 }
 
-void MinecraftProcess::prepare(InstancePtr inst)
+void MinecraftProcess::prepare(Instance *inst)
 {
 	extractLauncher(PathCombine(inst->minecraftDir(), LAUNCHER_FILE));
 	extractIcon(inst, PathCombine(inst->minecraftDir(), "icon.png"));
 }
 
 // constructor
-MinecraftProcess::MinecraftProcess(InstancePtr inst, QString user, QString session) :
+MinecraftProcess::MinecraftProcess(Instance *inst, QString user, QString session) :
 	m_instance(inst), m_user(user), m_session(session)
 {
 	connect(this, SIGNAL(finished(int, QProcess::ExitStatus)), SLOT(finish(int, QProcess::ExitStatus)));
@@ -254,9 +254,8 @@ void MinecraftProcess::genArgs()
 #endif
 	
 	// lwjgl
-	QString lwjgl = m_instance->lwjglVersion();
-	if (lwjgl != "Mojang")
-		lwjgl = QDir(globalSettings->get("LWJGLDir").toString() + "/" + lwjgl).absolutePath();
+	QString lwjgl = QDir(globalSettings->get("LWJGLDir").toString() + "/" + 
+						 m_instance->lwjglVersion()).absolutePath();
 	
 	// launcher arguments
 	m_arguments << QString("-Xms%1m").arg(m_instance->settings().get("MinMemAlloc").toInt());
diff --git a/libmultimc/src/minecraftversion.cpp b/libmultimc/src/minecraftversion.cpp
index 2e8b4a9b..7dee802f 100644
--- a/libmultimc/src/minecraftversion.cpp
+++ b/libmultimc/src/minecraftversion.cpp
@@ -24,6 +24,7 @@ MinecraftVersion::MinecraftVersion(QString descriptor,
 		InstVersion(descriptor, name, timestamp, parent), m_dlUrl(dlUrl), m_etag(etag)
 {
 	m_linkedVersion = NULL;
+	m_isNewLauncherVersion = false;
 }
 
 MinecraftVersion::MinecraftVersion(const MinecraftVersion *linkedVersion) :
@@ -98,6 +99,16 @@ qint64 MinecraftVersion::timestamp() const
 	return m_timestamp;
 }
 
+bool MinecraftVersion::isForNewLauncher() const
+{
+	return m_isNewLauncherVersion;
+}
+
+void MinecraftVersion::setIsForNewLauncher(bool val)
+{
+	m_isNewLauncherVersion = val;
+}
+
 MinecraftVersion::VersionType MinecraftVersion::versionType() const
 {
 	return m_type;
@@ -137,6 +148,7 @@ InstVersion *MinecraftVersion::copyVersion(InstVersionList *newParent) const
 		MinecraftVersion *version = new MinecraftVersion(
 					descriptor(), name(), timestamp(), downloadURL(), etag(), newParent);
 		version->setVersionType(versionType());
+		version->setIsForNewLauncher(isForNewLauncher());
 		return version;
 	}
 }
diff --git a/libmultimc/src/minecraftversionlist.cpp b/libmultimc/src/minecraftversionlist.cpp
index bb8b0f7a..8b40069e 100644
--- a/libmultimc/src/minecraftversionlist.cpp
+++ b/libmultimc/src/minecraftversionlist.cpp
@@ -29,6 +29,8 @@
 
 #include <QtNetwork>
 
+#include "netutils.h"
+
 #define MCVLIST_URLBASE "http://s3.amazonaws.com/Minecraft.Download/versions/"
 #define ASSETS_URLBASE "http://assets.minecraft.net/"
 #define MCN_URLBASE "http://sonicrules.org/mcnweb.py"
@@ -101,6 +103,7 @@ InstVersion *MinecraftVersionList::getLatestStable() const
 			return m_vlist.at(i);
 		}
 	}
+	return NULL;
 }
 
 MinecraftVersionList &MinecraftVersionList::getMainList()
@@ -169,13 +172,6 @@ inline QDateTime timeFromMCVListTime(QString str)
 	
 }
 
-inline void waitForNetRequest(QNetworkReply *netReply)
-{
-	QEventLoop loop;
-	loop.connect(netReply, SIGNAL(finished()), SLOT(quit()));
-	loop.exec();
-}
-
 
 MCVListLoadTask::MCVListLoadTask(MinecraftVersionList *vlist)
 {
@@ -222,7 +218,7 @@ bool MCVListLoadTask::loadFromVList()
 {
 	QNetworkReply *vlistReply = netMgr->get(QNetworkRequest(QUrl(QString(MCVLIST_URLBASE) + 
 																 "versions.json")));
-	waitForNetRequest(vlistReply);
+	NetUtils::waitForNetRequest(vlistReply);
 	
 	switch (vlistReply->error())
 	{
@@ -307,6 +303,7 @@ bool MCVListLoadTask::loadFromVList()
 				MinecraftVersion *mcVersion = new MinecraftVersion(
 							versionID, versionID, versionTime.toMSecsSinceEpoch(),
 							dlUrl, "");
+				mcVersion->setIsForNewLauncher(true);
 				mcVersion->setVersionType(versionType);
 				tempList.append(mcVersion);
 			}
@@ -335,7 +332,7 @@ bool MCVListLoadTask::loadFromAssets()
 	bool succeeded = false;
 	
 	QNetworkReply *assetsReply = netMgr->get(QNetworkRequest(QUrl(ASSETS_URLBASE)));
-	waitForNetRequest(assetsReply);
+	NetUtils::waitForNetRequest(assetsReply);
 	
 	switch (assetsReply->error())
 	{
@@ -459,7 +456,7 @@ bool MCVListLoadTask::loadFromAssets()
 bool MCVListLoadTask::loadMCNostalgia()
 {
 	QNetworkReply *mcnReply = netMgr->get(QNetworkRequest(QUrl(QString(MCN_URLBASE) + "?pversion=1&list=True")));
-	waitForNetRequest(mcnReply);
+	NetUtils::waitForNetRequest(mcnReply);
 	return true;
 }
 
diff --git a/libutil/CMakeLists.txt b/libutil/CMakeLists.txt
index 11b21426..caafc756 100644
--- a/libutil/CMakeLists.txt
+++ b/libutil/CMakeLists.txt
@@ -31,6 +31,7 @@ include/pathutils.h
 include/osutils.h
 include/userutils.h
 include/cmdutils.h
+include/netutils.h
 )
 
 SET(LIBUTIL_SOURCES
@@ -38,6 +39,7 @@ src/pathutils.cpp
 src/osutils.cpp
 src/userutils.cpp
 src/cmdutils.cpp
+src/netutils.cpp
 )
 
 # Set the include dir path.
diff --git a/libutil/include/netutils.h b/libutil/include/netutils.h
new file mode 100644
index 00000000..0153693b
--- /dev/null
+++ b/libutil/include/netutils.h
@@ -0,0 +1,36 @@
+/* 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.
+ */
+
+#ifndef NETUTILS_H
+#define NETUTILS_H
+
+#include <QObject>
+
+#include <QNetworkReply>
+#include <QEventLoop>
+
+namespace NetUtils
+{
+
+inline void waitForNetRequest(QNetworkReply *netReply)
+{
+	QEventLoop loop;
+	loop.connect(netReply, SIGNAL(finished()), SLOT(quit()));
+	loop.exec();
+}
+
+}
+
+#endif // NETUTILS_H
diff --git a/libutil/src/netutils.cpp b/libutil/src/netutils.cpp
new file mode 100644
index 00000000..57eead9b
--- /dev/null
+++ b/libutil/src/netutils.cpp
@@ -0,0 +1,16 @@
+/* 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 "include/netutils.h"
diff --git a/main.cpp b/main.cpp
index f54e8723..b9ca3a29 100644
--- a/main.cpp
+++ b/main.cpp
@@ -66,7 +66,7 @@ private slots:
 	{
 		// TODO: console
 		console = new ConsoleWindow();
-		proc = new MinecraftProcess(instance, response.username(), response.sessionID());
+		proc = new MinecraftProcess(instance.data(), response.username(), response.sessionID());
 		//if (instance->getShowConsole())
 		console->show();
 		connect(proc, SIGNAL(ended()), SLOT(onTerminated()));
@@ -82,7 +82,7 @@ private slots:
 			UserInfo uInfo(loginDlg->getUsername(), loginDlg->getPassword());
 			
 			TaskDialog* tDialog = new TaskDialog(nullptr);
-			LoginTask* loginTask = new LoginTask(uInfo, instance.data()->id(), tDialog);
+			LoginTask* loginTask = new LoginTask(uInfo, tDialog);
 			connect(loginTask, SIGNAL(loginComplete(QString, LoginResponse)),
 					SLOT(onLoginComplete(QString, LoginResponse)), Qt::QueuedConnection);
 			connect(loginTask, SIGNAL(loginFailed(QString, QString)),