Improve group changing, update instance on version change

Gives a list of existing groups to choose from.
Instances are updated as long as there is at least one valid account.

logic/BaseInstance.h

@@ -149,7 +149,7 @@ public:
 	 */
 	virtual SettingsObject &settings() const;
 
-	/// returns a valid update task if update is needed, NULL otherwise
+	/// returns a valid update task
 	virtual std::shared_ptr<Task> doUpdate(bool only_prepare) = 0;
 
 	/// returns a valid minecraft process, ready for launch with the given account.

logic/OneSixUpdate.cpp

@@ -54,11 +54,9 @@ void OneSixUpdate::executeTask()
 
 	if (m_only_prepare)
 	{
-		if (m_inst->shouldUpdate())
-		{
-			emitFailed("Unable to update instance in offline mode.");
-			return;
-		}
+		/*
+		 * FIXME: in offline mode, do not proceed!
+		 */
 		setStatus("Testing the Java installation.");
 		QString java_path = m_inst->settings().get("JavaPath").toString();
 

logic/auth/MojangAccountList.cpp

@@ -414,3 +414,13 @@ void MojangAccountList::setListFilePath(QString path, bool autosave)
 	m_listFilePath = path;
 	m_autosave = autosave;
 }
+
+bool MojangAccountList::anyAccountIsValid()
+{
+	for(auto account:m_accounts)
+	{
+		if(account->accountStatus() != NotVerified)
+			return true;
+	}
+	return false;
+}

logic/auth/MojangAccountList.h

@@ -126,6 +126,11 @@ public:
 	 * If the username given is an empty string, sets the active account to nothing.
 	 */
 	virtual void setActiveAccount(const QString &username);
+	
+	/*!
+	 * Returns true if any of the account is at least Validated
+	 */
+	bool anyAccountIsValid();
 
 signals:
 	/*!

logic/lists/InstanceList.cpp

@@ -117,6 +117,11 @@ void InstanceList::groupChanged()
 	saveGroupList();
 }
 
+QStringList InstanceList::getGroups()
+{
+	return m_groups.toList();
+}
+
 void InstanceList::saveGroupList()
 {
 	QString groupFileName = m_instDir + "/instgroups.json";
@@ -126,7 +131,7 @@ void InstanceList::saveGroupList()
 	if (!groupFile.open(QIODevice::WriteOnly | QIODevice::Truncate))
 	{
 		// An error occurred. Ignore it.
-		QLOG_ERROR() << "Failed to read instance group file.";
+		QLOG_ERROR() << "Failed to save instance group file.";
 		return;
 	}
 	QTextStream out(&groupFile);
@@ -137,6 +142,10 @@ void InstanceList::saveGroupList()
 		QString group = instance->group();
 		if (group.isEmpty())
 			continue;
+
+		// keep a list/set of groups for choosing
+		m_groups.insert(group);
+
 		if (!groupMap.count(group))
 		{
 			QSet<QString> set;
@@ -253,6 +262,9 @@ void InstanceList::loadGroupList(QMap<QString, QString> &groupMap)
 			continue;
 		}
 
+		// keep a list/set of groups for choosing
+		m_groups.insert(groupName);
+
 		// Iterate through the list of instances in the group.
 		QJsonArray instancesArray = groupObj.value("instances").toArray();
 

logic/lists/InstanceList.h

@@ -17,6 +17,7 @@
 
 #include <QObject>
 #include <QAbstractListModel>
+#include <QSet>
 #include "categorizedsortfilterproxymodel.h"
 #include <QIcon>
 
@@ -97,6 +98,9 @@ public:
 	InstancePtr getInstanceById(QString id) const;
 
 	QModelIndex getInstanceIndexById(const QString &id) const;
+
+	// FIXME: instead of iterating through all instances and forming a set, keep the set around
+	QStringList getGroups();
 signals:
 	void dataIsInvalid();
 
@@ -116,6 +120,7 @@ private:
 protected:
 	QString m_instDir;
 	QList<InstancePtr> m_instances;
+	QSet<QString> m_groups;
 };
 
 class InstanceProxyModel : public KCategorizedSortFilterProxyModel