path: root/src/dialog.cpp

#include "dialog.h"

#include <QMessageBox>
#include <QDebug>
#include <QRegExp>
#include <QFile>
#include <QProcess>
#include <QTimer>
#include <QDesktopWidget>
#include <QDateTime>
#include <QTemporaryFile>

#include "unistd.h"
#include "stdio.h"
#include "sys/wait.h"

#include "ui_dialog.h"
#include "sessiontreeitem.h"
#include "globals.h"
#include "vsession.h"
#include "choosersettings.h"

Dialog::Dialog(int defaultTab, bool examMode, QWidget *parent)
    : QDialog(parent), ui(new Ui::Dialog) {
    model_[0] = new SessionTreeModel(parent);
    model_[1] = new SessionTreeModel(parent);
    model_[2] = new SessionTreeModel(parent);
    if (defaultTab < 0 || defaultTab > TAB_COUNT) defaultTab = TAB_ALL_VMS;
    defaultTab_ = defaultTab;
    qDebug() << "Default tab: " << defaultTab;
    userInteracted_ = false;
    genericExpandedOnce_ = false;
    examMode_ = examMode;

    ui->setupUi(this);

    tabs_[0] = ui->tabButtonLocal;
    tabs_[1] = ui->tabButtonMyClasses;
    tabs_[2] = ui->tabButtonAllClasses;

    strings_[STR_LOADING] = QCoreApplication::instance()->translate("Dialog", "Loading...");
    strings_[STR_URL_ERROR] = QCoreApplication::instance()->translate("Dialog", "URL Error");
    strings_[STR_NO_ITEMS] = QCoreApplication::instance()->translate("Dialog", "No Items");

    // Re-center dialog every second to account for resolution changes
    QRect desktopRect = QApplication::desktop()->availableGeometry(this);
    oldCenter_ = desktopRect.center();
    centerTimer_ = new QTimer(this);
    connect(centerTimer_, SIGNAL(timeout()), this, SLOT(onCenterTimer()));
    centerTimer_->start(1000);

    ui->treeView->setFocusProxy(ui->filterEdit);
    // ui->filterEdit->installEventFilter(this);
    qApp->installEventFilter(this);

    ui->helpBox->hide();
    ui->newsBox->hide();
    ui->lblAutoQuit->hide();

    this->addStatusString(STR_LOADING);

    /*
     * TODO: why connect signal/slot when no item was loaded yet?
     * TODO: Change "TODO" in the above line to "QUESTION", as it's just that
    QObject::connect(ui->treeView->selectionModel(), SIGNAL(currentChanged ( const QModelIndex&, const QModelIndex&)),
            this, SLOT(treeView_selectionChanged(const QModelIndex&, const QModelIndex&)));
    */

    ui->PVS_checkbox->setVisible(g_pvsEnabled);

    if (examMode_) {
        ui->tabButtonLocal->setEnabled(false);
        this->onTabButtonChanged(TAB_ALL_VMS);
        /* modify the pvs checkbox */
        ui->PVS_checkbox->setText(tr("join PVS(limited)"));
        ui->PVS_checkbox->setEnabled(false);
        ui->PVS_checkbox->setChecked(true);

    } else {
        this->onTabButtonChanged(TAB_NATIVE);
        this->selectPreviousSession();
    }
    //activeTab_ = 2;
    //ui->tabButtonAllClasses->setChecked(true);

    ui->chkAdminMode->setVisible(g_allowVmEdit);

    // TODO: Implement bug report dialog :)
    ui->buttonBugReport->setEnabled(false);
    QObject::connect(SessionsIconHolder::get(), SIGNAL(iconDownloaded(const QUrl&, const QIcon&)),
            this, SLOT(iconDownloaded(const QUrl&, const QIcon&)));

}

Dialog::~Dialog() {
    delete ui;
}

void Dialog::changeEvent(QEvent *e) {
    QDialog::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

void Dialog::on_treeView_doubleClicked(const QModelIndex& index)
{
    userInteracted_ = true;
    // this method gets called when a Session has been selected to start

    SessionTreeItem* item =
                    static_cast<SessionTreeItem*>(index.internalPointer());

    if (item == NULL)
            return; // do nothing if cast failed

    const Session* s(item->session());
    if (s == NULL) // no valid session has been selected, do nothing
            return;

    // These two are up here in case run-virt cares...
    if (g_pvsEnabled) {
        if (ui->PVS_checkbox->isChecked()) {
            setenv("PVS_AUTO_CONNECT", "TRUE", 1);
        } else {
            setenv("PVS_AUTO_CONNECT", "FALSE", 1);
        }
    }
    if (g_allowVmEdit && ui->chkAdminMode->isChecked()) {
    	setenv("VMCHOOSER_ADMIN_MODE", "TRUE", 1);
    } else {
    	setenv("VMCHOOSER_ADMIN_MODE", "FALSE", 1);
    }

    // Run session
    if (s->run()) {
        // Run session start script if the session could be initialized successfully
        if (QFile::exists(sessionStartScript)) {
            // Use the current environment variables and add the necessary
            // information for the startUpScipt.
            // export session information to the environment of the process to be exec'ed
            setenv("SESSION_NAME", s->shortDescription().toUtf8(), 1);
            setenv("SESSION_UUID", s->uuid().toUtf8(), 1);
            setenv("SESSION_CMD", s->execCommand().toUtf8(), 1);
            if (s->type() == Session::VSESSION) {
               setenv("SESSION_TYPE", "VSESSION", 1);
            } else if (s->type() == Session::XSESSION) {
               setenv("SESSION_TYPE", "XSESSION", 1);
            }
            // Fork this process twice to detach
            pid_t pid = fork();
            if (pid == 0) {

                // Close all filedescriptors
                for (int i = 3; i < 1024; ++i)
                    ::close(i);

                // Change process group
                setsid();

                // Reopen standard pipes
                freopen("/dev/null", "r", stdin);
                freopen("/dev/null", "w", stdout);
                freopen("/dev/null", "w", stderr);

                pid = fork();
                if (pid == 0) {
                    // At this point we are executing as the 2nd child process
                    // Replace this clone with the process we'd like to start
                    char const * const args[] = {VMCHOOSER_SESSION_START_SCRIPT, NULL};
                    execv(VMCHOOSER_SESSION_START_SCRIPT, (char**)args);
                }
                _exit(0); // Dont use exit hooks
            }
            // Wait and cleanup the intermediate process
            waitpid(pid, NULL, 0);
        }
        ChooserSettings::setSetting("last-session", (s->shortDescription()));
        ChooserSettings::setSetting("last-tab", QString::number(activeTab_));
        g_autoQuitSeconds = 0; // So we don't kill the session :>
        setVisible(false);
    } else {
        QMessageBox::warning(
                    this, trUtf8("vmchooser"),
                    trUtf8("Vmchooser failed to run the selected session!"));
    }
}

void Dialog::on_treeView_expanded(const QModelIndex& index) {
    SessionTreeItem* item =
                    static_cast<SessionTreeItem*>(index.internalPointer());
    if (item->session() == NULL && item->sectionType() != SECTION_FOR_LOCATION) {
        genericExpandedOnce_ = true;
    }
}

void Dialog::addItems(const QList<Session*>& entries, int tab) {
    if (tab < 0 || tab > 2) {
        return;
    }
    if (examMode_ && tab == TAB_NATIVE)
        return;
    this->model_[tab]->addItems(entries);
    tabs_[tab]->setEnabled(this->model_[tab]->rowCount() != 0);
    if (tab == activeTab_) {
        setListModel(this->model_[tab]);
    }
    model_[tab]->updateView();
    selectPreviousSession();
    on_filterEdit_textChanged();
}

void Dialog::addStatusString(const int status) {
    if (status < 0 || status >= STR__MAX)
        return;
    this->model_[1]->addLabelItem(strings_[status]);
    this->model_[2]->addLabelItem(strings_[status]);
    tabs_[1]->setEnabled(this->model_[1]->rowCount() > 1);
    tabs_[2]->setEnabled(this->model_[2]->rowCount() > 1);
    model_[1]->updateView();
    model_[2]->updateView();
}

void Dialog::removeStatusString(const int status) {
    if (status < 0 || status >= STR__MAX)
        return;
    this->model_[1]->removeItem(strings_[status]);
    this->model_[2]->removeItem(strings_[status]);
    tabs_[1]->setEnabled(this->model_[1]->rowCount() > 1);
    tabs_[2]->setEnabled(this->model_[1]->rowCount() > 1);
    model_[1]->updateView();
    model_[2]->updateView();
}

void Dialog::on_pushButtonAbort_clicked() {
    close();
}

void Dialog::on_pushButtonStart_clicked() {
    userInteracted_ = true;
    this->on_treeView_doubleClicked(ui->treeView->selectionModel()->currentIndex());
}

bool Dialog::selectSession(const QString& name) {
    QModelIndex root(ui->treeView->rootIndex());

    for (int tab = 0; tab <= TAB_COUNT; ++tab) {
        for (int i = 0; i < model_[tab]->rowCount(root); ++i) {
            QModelIndex section(model_[tab]->index(i, 0, root));
            if (!section.isValid()) {
                break;
            }
            for (int j = 0; j < model_[tab]->rowCount(section); ++j) {
                QModelIndex index(model_[tab]->index(j, 0, section));
                SessionTreeItem* item = static_cast<SessionTreeItem*>(index.internalPointer());
                const Session* s(item->session());
                if (s == NULL) {
                    continue;
                }
                if (s->shortDescription() == name) {
                    // change the tab
                    onTabButtonChanged(tab);
                    // set selection
                    ui->treeView->selectionModel()->clearSelection();
                    ui->treeView->selectionModel()->clear();
                    ui->treeView->selectionModel()->select(index, QItemSelectionModel::Select);
                    ui->treeView->selectionModel()->setCurrentIndex(index, QItemSelectionModel::Select);
                    ui->treeView->scrollTo(index);
                    return true;
                }
            }
        }
    }

    return false;
}

bool Dialog::selectSessionByUuid(const QString& name) {
    QModelIndex root(ui->treeView->rootIndex());

    for (int tab = 0; tab <= TAB_COUNT; ++tab) {
        for (int i = 0; i < model_[tab]->rowCount(root); ++i) {
            QModelIndex section(model_[tab]->index(i, 0, root));
            if (!section.isValid()) {
                break;
            }
            for (int j = 0; j < model_[tab]->rowCount(section); ++j) {
                QModelIndex index(model_[tab]->index(j, 0, section));
                SessionTreeItem* item = static_cast<SessionTreeItem*>(index.internalPointer());
                const Session* s(item->session());
                if (s == NULL) {
                    continue;
                }
                /* TODO: implement this here */
                /* check if it is a vsession, then access the uuid and compare with name*/
                if (s->type() == Session::VSESSION) {
                    /* cast to vsession */
                    const VSession* v = static_cast<const VSession*>(s);
                    if (v->uuid() == name) {
                        // change the tab
                        onTabButtonChanged(tab);
                        // set selection
                        ui->treeView->selectionModel()->clearSelection();
                        ui->treeView->selectionModel()->clear();
                        ui->treeView->selectionModel()->select(index, QItemSelectionModel::Select);
                        ui->treeView->selectionModel()->setCurrentIndex(index, QItemSelectionModel::Select);
                        ui->treeView->scrollTo(index);
                        return true;
                    }
                }
            }
        }
    }

    return false;
}

void Dialog::selectPreviousSession() {
    if (userInteracted_) {
        qDebug() << "Not selecting previous session as user interacted or session was already selected";
        return;
    }
    if (!ChooserSettings::getSetting("last-session").isEmpty()) {
        qDebug() << "Trying to select last session: " << ChooserSettings::getSetting("last-session");
        ui->treeView->clearSelection();
        if (selectSession(ChooserSettings::getSetting("last-session"))) {
            qDebug() << "Success";
            userInteracted_ = true;
            return;
        }
    }
    // could not find last session, change to last used tab
    if (!ChooserSettings::getSetting("last-tab").isEmpty()) {
        qDebug() << "Trying to select last tab " << ChooserSettings::getSetting("last-tab");
        this->onTabButtonChanged(ChooserSettings::getSetting("last-tab").toInt());
    } else {
        qDebug() << "Selected default tab " << defaultTab_;
        // Select default tab
        this->onTabButtonChanged(defaultTab_);
    }
}

void Dialog::startSession(const QString& name) {
    autoStartEntry_ = name;
}

void Dialog::setTheme() {
    QString label_l_style, label_r_style;
    QString backgroundColor, imageLeft, imageRight;
    QString themePathBase, themePathIni, themePathImgLeft, themePathImgRight;

    if (theme.isEmpty()) return;

    themePathBase = QString("%1/%2/").arg(VMCHOOSER_THEME_BASE).arg(theme);
    themePathIni = QString("%1%2.ini").arg(themePathBase).arg(theme);

    if (!QFile::exists(themePathIni)) return;


    QSettings themeSettings(themePathIni, QSettings::IniFormat);
    backgroundColor = themeSettings.value("background-color").toString();
    imageLeft = themeSettings.value("image-left").toString();
    imageRight = themeSettings.value("image-right").toString();

    themePathImgLeft = QString("%1%2").arg(themePathBase).arg(imageLeft);
    themePathImgRight = QString("%1%2").arg(themePathBase).arg(imageRight);

    QRegExp re;

    ui->label_l->setPixmap(QPixmap(themePathImgLeft));
    ui->label_r->setPixmap(QPixmap(themePathImgRight));
    label_l_style = ui->label_l->styleSheet();
    label_r_style = ui->label_r->styleSheet();
    backgroundColor.prepend("\\1").append("\\2");
    label_l_style.replace(QRegExp("(.*background-color:)#[^;]*(;.*)"), backgroundColor);
    label_r_style.replace(QRegExp("(.*background-color:)#[^;]*(;.*)"), backgroundColor);
    ui->label_l->setStyleSheet(label_l_style);
    ui->label_r->setStyleSheet(label_r_style);
}


void Dialog::onCenterTimer() {
    // center dialog on primary screen
    if (isVisible()) {
        QRect desktopRect = QApplication::desktop()->availableGeometry(this);
        QPoint center = desktopRect.center();
        if (center != oldCenter_) {
            if (_fullscreen)
                this->resize(desktopRect.width(), desktopRect.height());
            this->move(center.x() - this->width() / 2, center.y() - this->height() / 2);
            oldCenter_ = center;
        }
    }
    // Handle auto-quit timeout
    if (g_autoQuitSeconds > 0) {
        g_autoQuitSeconds--;
        if (g_autoQuitSeconds == 0) {
            qApp->exit(0);
        } else if (g_autoQuitSeconds < 60) {
            ui->lblAutoQuit->setText(this->trUtf8("Auto logout in %1").arg(g_autoQuitSeconds));
            ui->lblAutoQuit->show();
        }
    }
}

void Dialog::addSessionsAfterDownload(QNetworkReply* reply) {
    QString temp_filename;

    if (reply->error() != QNetworkReply::NoError) {
        qDebug() << "Error reading from URL: " << reply->error();

        QFile backup_file(xml_filename);

        if (!backup_file.open(QIODevice::ReadOnly)) {
            qDebug() << "Cannot read backup file " << xml_filename << " either";
            this->removeStatusString(STR_LOADING);
            this->addStatusString(STR_URL_ERROR);
            return;
        }
        qDebug() << "Using backup file " << xml_filename;
        backup_file.close();

        temp_filename = xml_filename;
    } else {
        QByteArray data = reply->readAll();

        // write xml to temporary file
        temp_filename = QDir::tempPath() + "/vmchooser2/vmchooser-XXXXXX.xml";
        QTemporaryFile tmpfile(temp_filename);
        if (!tmpfile.open() || tmpfile.write(data) == -1) {
            return;
        }
        tmpfile.close();
        tmpfile.setAutoRemove(false);
        temp_filename = tmpfile.fileName();
    }

    QList<Session*> sessions = VSession::readXmlFile(temp_filename);

    this->removeStatusString(STR_LOADING);

    if (!sessions.isEmpty()) {
        qSort(sessions.begin(), sessions.end(), myLessThan);
        this->addItems(sessions, TAB_ALL_VMS);
        // TODO: Filter user's classes and add to tab[TAB_MY_COURSES]
    } else {
        this->addStatusString(STR_NO_ITEMS);
    }

    checkAutostart();

    // select last-session
    selectPreviousSession();
    userInteracted_ = true;
}


void Dialog::mousePressEvent(QMouseEvent * event) {
    QDialog::mousePressEvent(event);
    userInteracted_ = true;
}

void Dialog::treeView_selectionChanged(const QModelIndex& current, const QModelIndex&) {
    SessionTreeItem* item =
            static_cast<SessionTreeItem*>(current.internalPointer());
    if (item == NULL) return;

    const Session* s(item->session());
    if (!s) {
        qDebug() << "invalid selection";
        // no valid session has been selected, do nothing
        return;
    }

    QString description;
    if (s->type() == Session::VSESSION) {
        const VSession* vs = (VSession*) s;

        ui->label_creator->setText(vs->getAttribute("creator", "param"));
        ui->label_creator->setToolTip(vs->getAttribute("creator", "param"));

        ui->label_os->setText(vs->getAttribute("os_name", "param"));
        ui->label_os->setToolTip(vs->getAttribute("os_name", "param"));

        ui->label_platform->setText(vs->getAttribute("virtualizer_name", "param"));
        ui->label_platform->setToolTip(vs->getAttribute("virtualizer_name", "param"));

        if (vs->keywords().length() > 0) {
            description = "\n\nKeywords: ";
            for (int i = 0; i < vs->keywords().length(); ++i) {
                description += vs->keywords()[i] + ", ";
            }
        }
    } else {
        ui->label_creator->setText("");
        ui->label_creator->setToolTip("");
        ui->label_os->setText(QCoreApplication::instance()->translate("Dialog", "Native Linux"));
        ui->label_platform->setText("Linux");
        ui->label_platform->setToolTip("");
    }
    ui->label_name->setText(s->shortDescription());
    ui->label_name->setToolTip(s->shortDescription());
    ui->textBrowser->setPlainText(s->description() + description);
}

void Dialog::on_tabButtonLocal_clicked() {
    userInteracted_ = true;
    onTabButtonChanged(TAB_NATIVE);
}

void Dialog::on_tabButtonMyClasses_clicked() {
    userInteracted_ = true;
    onTabButtonChanged(TAB_MY_COURSES);
}

void Dialog::on_tabButtonAllClasses_clicked() {
    userInteracted_ = true;
    onTabButtonChanged(TAB_ALL_VMS);
}

void Dialog::onTabButtonChanged(int tab) {
    if (tab < 0 || tab > 2) {
        // no valid button
        return;
    }

    // give focus to treeView
    if (!ui->treeView->hasFocus()) {
        ui->treeView->setFocus();
    }

    // Update pressed status of buttons
    for (int i = 0; i < 3; ++i) {
        tabs_[i]->setChecked(tab == i);
    }

    // clear filter if necessary
    if (activeTab_ != tab) {
        this->ui->filterEdit->setText("");
    }

    // load the new list
    setListModel(model_[tab]);
    this->activeTab_ = tab;

    /* get the first element ad select it */
    selectFirstElement();

}

void Dialog::on_filterEdit_textEdited() {
    userInteracted_ = true;
}

void Dialog::on_filterEdit_textChanged() {
    if (activeTab_ < 0 || activeTab_ >= TAB_COUNT) return;
    SessionTreeModel *newModel = NULL;

    // filter the current model
    if (!ui->filterEdit->text().isEmpty() && ui->filterEdit->text().replace(" ", "").length() > 2) {
        if (model_[activeTab_] != NULL) {
            newModel = new SessionTreeModel(this);
            newModel->addItems(this->model_[activeTab_]->lookForItem(ui->filterEdit->text()));
        }
    }
    if (newModel == NULL) {
        newModel = model_[activeTab_];
    }
    if (newModel != NULL) {
        setListModel(newModel);
    }
}

void Dialog::setListModel(SessionTreeModel *model) {
    QAbstractItemModel *old = NULL;
    if (ui->treeView->model() == model_[0] || ui->treeView->model() == model_[1] || ui->treeView->model() == model_[2]) {
    } else {
        old = ui->treeView->model();
    }
    ui->treeView->setModel(model);
    ui->treeView->expandAll();
    if (!genericExpandedOnce_ && g_forLocationHandling == LOCATION_EXCLUSIVE && model->rowCount() > 1) {
        QModelIndex index = model->getSection(SECTION_GENERIC);
        if (index.isValid()) {
            ui->treeView->collapse(index);
        }
        index = model->getSection(SECTION_TEMPLATES);
        if (index.isValid()) {
            ui->treeView->collapse(index);
        }
    }
    if (old != NULL) {
        old->deleteLater();
    }

    // reconnect the treeModel
    QObject::connect(ui->treeView->selectionModel(), SIGNAL(currentChanged(const QModelIndex&, const QModelIndex&)),
            this, SLOT(treeView_selectionChanged(const QModelIndex&, const QModelIndex&)));

    // select the first element, if no element is selected
    if (ui->treeView->selectionModel()->selectedRows().count() == 0) {
        //ui->treeView->selectionModel()->setCurrentIndex(ui->treeView->model()->index(0, 0, ui->treeView->rootIndex()), QItemSelectionModel::Select);
        ui->treeView->selectionModel()->select(ui->treeView->model()->index(0, 0, ui->treeView->rootIndex()), QItemSelectionModel::Select);
    }
}

void Dialog::on_helpNewsButton_clicked() {
    if (ui->helpBox->isVisible()) {
        ui->helpBox->hide();
        ui->newsBox->hide();
    } else {
        ui->helpBox->show();
        ui->newsBox->show();
    }
}

void Dialog::addNewsAfterDownload(QNetworkReply* reply) {
    if (reply->error() != QNetworkReply::NoError) {
        if (debugMode) {
            qDebug() << "Could not get news. Try to get cached news.";
        }

        // try to get cached news
        QFile backup_file(news_backup_filename);

        if (!backup_file.open(QIODevice::ReadOnly)) {
            if (debugMode) {
                qDebug() << "Cannot read backup file " << news_backup_filename << " either";
            }
            this->ui->newsTextBrowser->setText(QCoreApplication::instance()->translate("Dialog", "Could not get news."));
            return;
        }
        if (debugMode) {
            qDebug() << "Used backup file " << news_backup_filename;
        }
        backup_file.close();
        return;
    }
    QByteArray data = reply->readAll();
    QDomDocument doc;
    if (!doc.setContent(data)) {
        qDebug() << "News XML contains errors.";
        return;
    }
    QDomElement newsNode = doc.firstChildElement("news");
    QDomElement timeNode = newsNode.firstChildElement("date");
    QDomElement infoNode = newsNode.firstChildElement("info");
    QDateTime timestamp;
    timestamp.setTime_t(timeNode.text().toInt());

    if (timeNode.isNull() || infoNode.isNull()) {
        ui->newsTextBrowser->setText(QCoreApplication::instance()->translate("Dialog", "Could not get news. (//news/date or //news/info missing)"));
    } else {
        // format and print news
        ui->newsTextBrowser->setText(QString("<p style='font-size:16px; margin-bottom: 2px;'>" + newsNode.firstChildElement("headline").text() + "</p> <small>"
                + timestamp.toString(Qt::SystemLocaleShortDate) + "</small><p>"
                + infoNode.text() + "</p>"));
    }

    if (ChooserSettings::getSetting("last-news").toUInt() < timestamp.toTime_t()) {
        // show news if not seen before
        on_helpNewsButton_clicked();
    }

    // update ini
    ChooserSettings::setSetting("last-news", QString::number(timestamp.toTime_t()));

    // make backup
    QFile file(news_backup_filename);
    if (!file.open(QIODevice::WriteOnly)) {
        if (debugMode) {
            qDebug() << "Could not write XML to " << news_backup_filename;
        }
        return;
    }

    if (file.write(data) != data.length()) {
        return;
    }
    if (!file.setPermissions(QFile::ReadUser | QFile::ReadGroup | QFile::ReadOther | QFile::WriteUser | QFile::WriteGroup | QFile::WriteOther)) {
        if (debugMode) {
            qDebug() << "Could not change permissions of file: " << news_backup_filename;
        }
    }
    file.close();
}

void Dialog::addHelpAfterDownload(QNetworkReply* reply) {
    if (reply->error() != QNetworkReply::NoError) {
        if (debugMode) {
            qDebug() << "Could not get help xml. Try to get cached help...";
        }

        // try to get cached news
        QFile backup_file(help_backup_filename);

        if (!backup_file.open(QIODevice::ReadOnly)) {
            if (debugMode) {
                qDebug() << "Cannot read backup file " << help_backup_filename << " either";
            }
            this->ui->helpTextBrowser->setText(QCoreApplication::instance()->translate("Dialog", "Could not get help."));
            return;
        }
        if (debugMode) {
            qDebug() << "Used backup file " << help_backup_filename;
        }
        backup_file.close();
        return;
    }

    QByteArray data = reply->readAll();
    QDomDocument doc;

    if (!doc.setContent(data)) {
        if (debugMode) {
            qDebug() << "Help file contains errors.";
        }
        return;
    }

    QDomElement newsNode = doc.firstChildElement("news").firstChildElement("info");
    if (newsNode.isNull()) {
        ui->helpTextBrowser->setText(QCoreApplication::instance()->translate("Dialog", "Could not get help (XML has no //news/info)"));
    } else {
        ui->helpTextBrowser->setText(newsNode.text());
    }

    // make backup
    QFile file(help_backup_filename);
    if (!file.open(QIODevice::WriteOnly)) {
        if (debugMode) {
            qDebug() << "Could not write XML to " << help_backup_filename;
        }
        return;
    }

    if (file.write(data) != data.length()) {
        return;
    }
    if (!file.setPermissions(QFile::ReadUser | QFile::ReadGroup | QFile::ReadOther | QFile::WriteUser | QFile::WriteGroup | QFile::WriteOther)) {
        if (debugMode) {
            qDebug() << "Could not change permissions of file: " << help_backup_filename;
        }
    }
    file.close();
}

void Dialog::keyPressEvent(QKeyEvent* event) {
    switch(event->key()) {
    case Qt::Key_Return:    this->on_pushButtonStart_clicked(); break;
    case Qt::Key_Escape:    this->on_pushButtonAbort_clicked(); break;
    case Qt::Key_H:         this->on_helpNewsButton_clicked(); break;
    }
    QDialog::keyPressEvent(event);
}

void Dialog::iconDownloaded(const QUrl& url, const QIcon&) {
    qDebug() << "Icon downloaded... (" << url << ")";
    // TODO: Check which model(s) contain an entry with this icon
    model_[TAB_MY_COURSES]->updateView();
    model_[TAB_ALL_VMS]->updateView();
}

void Dialog::on_leftKey() {
    int i = activeTab_;
    do {
        i = (i - 1 + TAB_COUNT) % TAB_COUNT;
    } while (!tabs_[i]->isEnabled());
    onTabButtonChanged(i);
}

void Dialog::on_rightKey() {
    int i = activeTab_;
    do {
        i = (i + 1) % TAB_COUNT;
    } while (!tabs_[i]->isEnabled());
    onTabButtonChanged(i);
}

/* when the user presses the space key, the current selection in the treeview
 * should be collapsed/expanded. */
void Dialog::on_spaceKey() {
    QModelIndex index = ui->treeView->selectionModel()->currentIndex();
    if (ui->treeView->isExpanded(index)) {
        ui->treeView->collapse(index);
    } else {
        ui->treeView->expand(index);
    }
}

void Dialog::selectFirstElement() {
    QModelIndex root(ui->treeView->rootIndex());
    QModelIndex section(model_[activeTab_]->index(0, 0, root));
    QModelIndex newIndex = QModelIndex(model_[activeTab_]->index(0, 0, section));

    ui->treeView->selectionModel()->setCurrentIndex(newIndex, QItemSelectionModel::Select);
    ui->treeView->setFocus();
}

/* install this filter to the filterEdit to listen for arrow keys */
bool Dialog::eventFilter(QObject*, QEvent *event) {
    if (event->type() == QEvent::KeyPress) {
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        bool fortv = false;
        if (keyEvent->key() == Qt::Key_Right) {
            on_rightKey();
            fortv = true;
        }
        if (keyEvent->key() == Qt::Key_Left) {
            on_leftKey();
            fortv = true;
        }
        if (keyEvent->key() == Qt::Key_Up) {
            ui->treeView->cursorUp();
            fortv = true;
        }
        if (keyEvent->key() == Qt::Key_Down) {
            ui->treeView->cursorDown();
            fortv = true;
        }
        if (fortv) {
            ui->treeView->setFocus();
            return true;
        }
    }
    return false;
}
void Dialog::checkAutostart() {
    if (!autoStartEntry_.isEmpty()) {
        if (this->selectSessionByUuid(autoStartEntry_) || this->selectSession(autoStartEntry_)) {
            this->on_treeView_doubleClicked(ui->treeView->selectionModel()->currentIndex());
        } else {
            QMessageBox::critical(this, "Autostart", QString::fromUtf8("Konnte %1 nicht starten.").arg(autoStartEntry_));
        }
        autoStartEntry_.clear();
        return;
    }
}