/**************************************************************************
**
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** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Installer Framework.
**
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** accordance with the commercial license agreement provided with the
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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**************************************************************************/
#include "packagemanagergui.h"

#include "component.h"
#include "componentmodel.h"
#include "errors.h"
#include "fileutils.h"
#include "messageboxhandler.h"
#include "packagemanagercore.h"
#include "progresscoordinator.h"
#include "performinstallationform.h"
#include "settings.h"
#include "utils.h"

#include "kdsysinfo.h"

#include <QtCore/QDir>
#include <QtCore/QDynamicPropertyChangeEvent>
#include <QtCore/QPair>
#include <QtCore/QProcess>
#include <QtCore/QRegExp>
#include <QtCore/QSettings>
#include <QtCore/QTimer>

#include <QApplication>
#include <QCheckBox>
#include <QDesktopServices>
#include <QFileDialog>
#include <QGridLayout>
#include <QFormLayout>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QLabel>
#include <QLineEdit>
#include <QListWidget>
#include <QListWidgetItem>
#include <QMessageBox>
#include <QProgressBar>
#include <QPushButton>
#include <QRadioButton>
#include <QTextBrowser>
#include <QTreeWidget>
#include <QTreeView>
#include <QVBoxLayout>
#include <QScrollBar>
#include <QShowEvent>

#include <QtScript/QScriptEngine>

using namespace KDUpdater;
using namespace QInstaller;

/*
TRANSLATOR QInstaller::PackageManagerCore;
*/
/*
TRANSLATOR QInstaller::PackageManagerGui
*/
/*
TRANSLATOR QInstaller::PackageManagerPage
*/
/*
TRANSLATOR QInstaller::IntroductionPage
*/
/*
TRANSLATOR QInstaller::LicenseAgreementPage
*/
/*
TRANSLATOR QInstaller::ComponentSelectionPage
*/
/*
TRANSLATOR QInstaller::TargetDirectoryPage
*/
/*
TRANSLATOR QInstaller::StartMenuDirectoryPage
*/
/*
TRANSLATOR QInstaller::ReadyForInstallationPage
*/
/*
TRANSLATOR QInstaller::PerformInstallationPage
*/
/*
TRANSLATOR QInstaller::FinishedPage
*/

class DynamicInstallerPage : public PackageManagerPage
{
public:
    explicit DynamicInstallerPage(QWidget *widget, PackageManagerCore *core = 0)
        : PackageManagerPage(core)
        , m_widget(widget)
    {
        setObjectName(QLatin1String("Dynamic") + widget->objectName());
        setPixmap(QWizard::LogoPixmap, logoPixmap());
        setPixmap(QWizard::WatermarkPixmap, QPixmap());
        setPixmap(QWizard::BannerPixmap, QPixmap());

        setLayout(new QVBoxLayout);
        setSubTitle(QString());
        setTitle(widget->windowTitle());
        m_widget->setProperty("complete", true);
        m_widget->setProperty("final", false);
        widget->installEventFilter(this);
        layout()->addWidget(widget);
    }

    QWidget *widget() const
    {
        return m_widget;
    }

    bool isComplete() const
    {
        return m_widget->property("complete").toBool();
    }

protected:
    bool eventFilter(QObject *obj, QEvent *event)
    {
        if (obj == m_widget) {
            switch(event->type()) {
            case QEvent::WindowTitleChange:
                setTitle(m_widget->windowTitle());
                break;

            case QEvent::DynamicPropertyChange:
                emit completeChanged();
                if (m_widget->property("final").toBool() != isFinalPage())
                    setFinalPage(m_widget->property("final").toBool());
                break;

            default:
                break;
            }
        }
        return PackageManagerPage::eventFilter(obj, event);
    }

private:
    QWidget *const m_widget;
};


// -- PackageManagerGui::Private

class PackageManagerGui::Private
{
public:
    Private()
        : m_modified(false)
        , m_autoSwitchPage(true)
        , m_showSettingsButton(false)
    {
        m_wizardButtonTypes.insert(QWizard::BackButton, QLatin1String("QWizard::BackButton"));
        m_wizardButtonTypes.insert(QWizard::NextButton, QLatin1String("QWizard::NextButton"));
        m_wizardButtonTypes.insert(QWizard::CommitButton, QLatin1String("QWizard::CommitButton"));
        m_wizardButtonTypes.insert(QWizard::FinishButton, QLatin1String("QWizard::FinishButton"));
        m_wizardButtonTypes.insert(QWizard::CancelButton, QLatin1String("QWizard::CancelButton"));
        m_wizardButtonTypes.insert(QWizard::HelpButton, QLatin1String("QWizard::HelpButton"));
        m_wizardButtonTypes.insert(QWizard::CustomButton1, QLatin1String("QWizard::CustomButton1"));
        m_wizardButtonTypes.insert(QWizard::CustomButton2, QLatin1String("QWizard::CustomButton2"));
        m_wizardButtonTypes.insert(QWizard::CustomButton3, QLatin1String("QWizard::CustomButton3"));
        m_wizardButtonTypes.insert(QWizard::Stretch, QLatin1String("QWizard::Stretch"));
    }

    QString buttonType(int wizardButton)
    {
        return m_wizardButtonTypes.value(static_cast<QWizard::WizardButton>(wizardButton),
            QLatin1String("unknown button"));
    }


    bool m_modified;
    bool m_autoSwitchPage;
    bool m_showSettingsButton;
    QHash<int, QWizardPage*> m_defaultPages;
    QHash<int, QString> m_defaultButtonText;

    QScriptValue m_controlScript;
    QScriptEngine m_controlScriptEngine;
    QHash<QWizard::WizardButton, QString> m_wizardButtonTypes;
};


// -- PackageManagerGui

QScriptEngine *PackageManagerGui::controlScriptEngine() const
{
    return &d->m_controlScriptEngine;
}

/*!
    \class QInstaller::PackageManagerGui
    Is the "gui" object in a none interactive installation
*/
PackageManagerGui::PackageManagerGui(PackageManagerCore *core, QWidget *parent)
    : QWizard(parent)
    , d(new Private)
    , m_core(core)
{
    if (m_core->isInstaller())
        setWindowTitle(tr("%1 Setup").arg(m_core->value(scTitle)));
    else
        setWindowTitle(tr("Maintain %1").arg(m_core->value(scTitle)));

#ifndef Q_OS_MAC
    setWindowIcon(QIcon(m_core->settings().installerWindowIcon()));
#else
    setPixmap(QWizard::BackgroundPixmap, m_core->settings().background());
#endif
#ifdef Q_OS_LINUX
    setWizardStyle(QWizard::ModernStyle);
    setSizeGripEnabled(true);
#endif
    setOption(QWizard::NoBackButtonOnStartPage);
    setOption(QWizard::NoBackButtonOnLastPage);

    connect(this, SIGNAL(rejected()), m_core, SLOT(setCanceled()));
    connect(this, SIGNAL(interrupted()), m_core, SLOT(interrupt()));

    // both queued to show the finished page once everything is done
    connect(m_core, SIGNAL(installationFinished()), this, SLOT(showFinishedPage()), Qt::QueuedConnection);
    connect(m_core, SIGNAL(uninstallationFinished()), this, SLOT(showFinishedPage()), Qt::QueuedConnection);

    connect(this, SIGNAL(currentIdChanged(int)), this, SLOT(slotCurrentPageChanged(int)));
    connect(this, SIGNAL(currentIdChanged(int)), m_core, SIGNAL(currentPageChanged(int)));
    connect(button(QWizard::FinishButton), SIGNAL(clicked()), this, SIGNAL(finishButtonClicked()));
    connect(button(QWizard::FinishButton), SIGNAL(clicked()), m_core, SIGNAL(finishButtonClicked()));

    // make sure the QUiLoader's retranslateUi is executed first, then the script
    connect(this, SIGNAL(languageChanged()), m_core, SLOT(languageChanged()), Qt::QueuedConnection);
    connect(this, SIGNAL(languageChanged()), this, SLOT(onLanguageChanged()), Qt::QueuedConnection);

    connect(m_core, SIGNAL(wizardPageInsertionRequested(QWidget*, QInstaller::PackageManagerCore::WizardPage)),
        this, SLOT(wizardPageInsertionRequested(QWidget*, QInstaller::PackageManagerCore::WizardPage)));
    connect(m_core, SIGNAL(wizardPageRemovalRequested(QWidget*)),this,
        SLOT(wizardPageRemovalRequested(QWidget*)));
    connect(m_core, SIGNAL(wizardWidgetInsertionRequested(QWidget*, QInstaller::PackageManagerCore::WizardPage)),
        this, SLOT(wizardWidgetInsertionRequested(QWidget*, QInstaller::PackageManagerCore::WizardPage)));
    connect(m_core, SIGNAL(wizardWidgetRemovalRequested(QWidget*)), this,
        SLOT(wizardWidgetRemovalRequested(QWidget*)));
    connect(m_core, SIGNAL(wizardPageVisibilityChangeRequested(bool, int)), this,
        SLOT(wizardPageVisibilityChangeRequested(bool, int)), Qt::QueuedConnection);

    connect(m_core, SIGNAL(setValidatorForCustomPageRequested(QInstaller::Component*, QString, QString)),
            this, SLOT(setValidatorForCustomPageRequested(QInstaller::Component*, QString, QString)));

    connect(m_core, SIGNAL(setAutomatedPageSwitchEnabled(bool)), this,
        SLOT(setAutomatedPageSwitchEnabled(bool)));

    connect(this, SIGNAL(customButtonClicked(int)), this, SLOT(customButtonClicked(int)));

    for (int i = QWizard::BackButton; i < QWizard::CustomButton1; ++i)
        d->m_defaultButtonText.insert(i, buttonText(QWizard::WizardButton(i)));
}

PackageManagerGui::~PackageManagerGui()
{
    delete d;
}

void PackageManagerGui::setAutomatedPageSwitchEnabled(bool request)
{
    d->m_autoSwitchPage = request;
}

QString PackageManagerGui::defaultButtonText(int wizardButton) const
{
    return d->m_defaultButtonText.value(wizardButton);
}

void PackageManagerGui::clickButton(int wb, int delay)
{
    if (QAbstractButton *b = button(static_cast<QWizard::WizardButton>(wb) )) {
        QTimer::singleShot(delay, b, SLOT(click()));
    } else {
        qWarning() << "Button with type: " << d->buttonType(wb) << "not found!";
    }
}

bool PackageManagerGui::isButtonEnabled(int wb)
{
    if (QAbstractButton *b = button(static_cast<QWizard::WizardButton>(wb) )) {
        return b->isEnabled();
    } else {
        qWarning() << "Button with type: " << d->buttonType(wb) << "not found!";
    }
    return false;
}

void PackageManagerGui::setValidatorForCustomPageRequested(Component *component, const QString &name,
                                                           const QString &callbackName)
{
    component->setValidatorCallbackName(callbackName);

    const QString componentName = QLatin1String("Dynamic") + name;
    const QList<int> ids = pageIds();
    foreach (const int i, ids) {
        PackageManagerPage *const p = qobject_cast<PackageManagerPage*> (page(i));
        if (p && p->objectName() == componentName) {
            p->setValidatePageComponent(component);
            return;
        }
    }
}

/*!
    Loads a script to perform the installation non-interactively.
    @throws QInstaller::Error if the script is not readable/cannot be parsed
*/
void PackageManagerGui::loadControlScript(const QString &scriptPath)
{
    QFile file(scriptPath);
    if (!file.open(QIODevice::ReadOnly)) {
        throw Error(QObject::tr("Could not open the requested script file at %1: %2")
            .arg(scriptPath, file.errorString()));
    }

    QScriptValue installerObject = d->m_controlScriptEngine.newQObject(m_core);
    installerObject.setProperty(QLatin1String("componentByName"), d->m_controlScriptEngine
        .newFunction(qInstallerComponentByName, 1));

    d->m_controlScriptEngine.globalObject().setProperty(QLatin1String("installer"),
        installerObject);
    d->m_controlScriptEngine.globalObject().setProperty(QLatin1String("gui"),
        d->m_controlScriptEngine.newQObject(this));
    d->m_controlScriptEngine.globalObject().setProperty(QLatin1String("packagemanagergui"),
        d->m_controlScriptEngine.newQObject(this));
    registerMessageBox(&d->m_controlScriptEngine);

#undef REGISTER_BUTTON
#define REGISTER_BUTTON(x)    buttons.setProperty(QLatin1String(#x), \
    d->m_controlScriptEngine.newVariant(static_cast<int>(QWizard::x)));

    QScriptValue buttons = d->m_controlScriptEngine.newArray();
    REGISTER_BUTTON(BackButton)
    REGISTER_BUTTON(NextButton)
    REGISTER_BUTTON(CommitButton)
    REGISTER_BUTTON(FinishButton)
    REGISTER_BUTTON(CancelButton)
    REGISTER_BUTTON(HelpButton)
    REGISTER_BUTTON(CustomButton1)
    REGISTER_BUTTON(CustomButton2)
    REGISTER_BUTTON(CustomButton3)

#undef REGISTER_BUTTON

    d->m_controlScriptEngine.globalObject().setProperty(QLatin1String("buttons"), buttons);

    d->m_controlScriptEngine.evaluate(QLatin1String(file.readAll()), scriptPath);
    if (d->m_controlScriptEngine.hasUncaughtException()) {
        throw Error(QObject::tr("Exception while loading the control script %1")
            .arg(uncaughtExceptionString(&(d->m_controlScriptEngine)/*, scriptPath*/)));
    }

    QScriptValue comp = d->m_controlScriptEngine.evaluate(QLatin1String("Controller"));
    if (d->m_controlScriptEngine.hasUncaughtException()) {
        throw Error(QObject::tr("Exception while loading the control script %1")
            .arg(uncaughtExceptionString(&(d->m_controlScriptEngine)/*, scriptPath*/)));
    }

    d->m_controlScript = comp;
    d->m_controlScript.construct();

    qDebug() << "Loaded control script" << scriptPath;
}

void PackageManagerGui::slotCurrentPageChanged(int id)
{
    QMetaObject::invokeMethod(this, "delayedControlScriptExecution", Qt::QueuedConnection,
        Q_ARG(int, id));
}

void PackageManagerGui::callControlScriptMethod(const QString &methodName)
{
    if (!d->m_controlScript.isValid())
        return;

    QScriptValue method = d->m_controlScript.property(QLatin1String("prototype")).property(methodName);

    if (!method.isValid()) {
        qDebug() << "Control script callback" << methodName << "does not exist.";
        return;
    }

    qDebug() << "Calling control script callback" << methodName;

    method.call(d->m_controlScript);

    if (d->m_controlScriptEngine.hasUncaughtException()) {
        qCritical()
            << uncaughtExceptionString(&(d->m_controlScriptEngine) /*, QLatin1String("control script")*/);
        // TODO: handle error
    }
}

void PackageManagerGui::delayedControlScriptExecution(int id)
{
    if (PackageManagerPage *const p = qobject_cast<PackageManagerPage*> (page(id)))
        callControlScriptMethod(p->objectName() + QLatin1String("Callback"));
}

void PackageManagerGui::onLanguageChanged()
{
    d->m_defaultButtonText.clear();
    for (int i = QWizard::BackButton; i < QWizard::CustomButton1; ++i)
        d->m_defaultButtonText.insert(i, buttonText(QWizard::WizardButton(i)));
}

bool PackageManagerGui::event(QEvent *event)
{
    switch(event->type()) {
    case QEvent::LanguageChange:
        emit languageChanged();
        break;
    default:
        break;
    }
    return QWizard::event(event);
}

void PackageManagerGui::showEvent(QShowEvent *event)
{
    if (!event->spontaneous()) {
        foreach (int id, pageIds()) {
            const QString subTitle = page(id)->subTitle();
            if (subTitle.isEmpty()) {
                const QWizard::WizardStyle style = wizardStyle();
                if ((style == QWizard::ClassicStyle || style == QWizard::ModernStyle))
                    page(id)->setSubTitle(QLatin1String(" "));    // otherwise the colors might screw up
            }
        }
    }
    QWizard::showEvent(event);
    QMetaObject::invokeMethod(this, "dependsOnLocalInstallerBinary", Qt::QueuedConnection);
}

void PackageManagerGui::wizardPageInsertionRequested(QWidget *widget,
    QInstaller::PackageManagerCore::WizardPage page)
{
    // just in case it was already in there...
    wizardPageRemovalRequested(widget);

    int pageId = static_cast<int>(page) - 1;
    while (QWizard::page(pageId) != 0)
        --pageId;

    // add it
    setPage(pageId, new DynamicInstallerPage(widget, m_core));
}

void PackageManagerGui::wizardPageRemovalRequested(QWidget *widget)
{
    foreach (int pageId, pageIds()) {
        DynamicInstallerPage *const dynamicPage = dynamic_cast<DynamicInstallerPage*>(page(pageId));
        if (dynamicPage == 0)
            continue;
        if (dynamicPage->widget() != widget)
            continue;
        removePage(pageId);
        d->m_defaultPages.remove(pageId);
    }
}

void PackageManagerGui::wizardWidgetInsertionRequested(QWidget *widget,
    QInstaller::PackageManagerCore::WizardPage page)
{
    Q_ASSERT(widget);
    if (QWizardPage *const p = QWizard::page(page))
        p->layout()->addWidget(widget);
}

void PackageManagerGui::wizardWidgetRemovalRequested(QWidget *widget)
{
    Q_ASSERT(widget);
    widget->setParent(0);
}

void PackageManagerGui::wizardPageVisibilityChangeRequested(bool visible, int p)
{
    if (visible && page(p) == 0) {
        setPage(p, d->m_defaultPages[p]);
    } else if (!visible && page(p) != 0) {
        d->m_defaultPages[p] = page(p);
        removePage(p);
    }
}

PackageManagerPage *PackageManagerGui::page(int pageId) const
{
    return qobject_cast<PackageManagerPage*> (QWizard::page(pageId));
}

QWidget *PackageManagerGui::pageWidgetByObjectName(const QString &name) const
{
    const QList<int> ids = pageIds();
    foreach (const int i, ids) {
        PackageManagerPage *const p = qobject_cast<PackageManagerPage*> (page(i));
        if (p && p->objectName() == name) {
            // For dynamic pages, return the contained widget (as read from the UI file), not the
            // wrapper page
            if (DynamicInstallerPage *dp = dynamic_cast<DynamicInstallerPage*>(p))
                return dp->widget();
            return p;
        }
    }
    qDebug() << "No page found for object name" << name;
    return 0;
}

QWidget *PackageManagerGui::currentPageWidget() const
{
    return currentPage();
}

void PackageManagerGui::cancelButtonClicked()
{
    if (currentId() != PackageManagerCore::Introduction
        && currentId() != PackageManagerCore::InstallationFinished) {
        PackageManagerPage *const page = qobject_cast<PackageManagerPage*> (currentPage());
        if (page && page->isInterruptible() && m_core->status() != PackageManagerCore::Canceled
            && m_core->status() != PackageManagerCore::Failure) {
            const QMessageBox::StandardButton bt =
                MessageBoxHandler::question(MessageBoxHandler::currentBestSuitParent(),
                QLatin1String("cancelInstallation"), tr("Question"),
                tr("Do you want to abort the %1 process?").arg(m_core->isUninstaller() ? tr("uninstallation")
                    : tr("installation")), QMessageBox::Yes | QMessageBox::No);
            if (bt == QMessageBox::Yes)
                emit interrupted();
        } else {
            QString app = tr("installer");
            if (m_core->isUninstaller())
                app = tr("uninstaller");
            if (m_core->isUpdater() || m_core->isPackageManager())
                app = tr("maintenance");

            const QMessageBox::StandardButton bt =
                MessageBoxHandler::question(MessageBoxHandler::currentBestSuitParent(),
                QLatin1String("cancelInstallation"), tr("Question"),
                tr("Do you want to quit the %1 application?").arg(app), QMessageBox::Yes | QMessageBox::No);
            if (bt == QMessageBox::Yes)
                QDialog::reject();
        }
    } else {
        QDialog::reject();
    }
}

void PackageManagerGui::rejectWithoutPrompt()
{
    m_core->setCanceled();
    QDialog::reject();
}

void PackageManagerGui::reject()
{
    cancelButtonClicked();
}

void PackageManagerGui::setModified(bool value)
{
    d->m_modified = value;
}

void PackageManagerGui::showFinishedPage()
{
    qDebug() << "SHOW FINISHED PAGE";
    if (d->m_autoSwitchPage)
        next();
    else
        qobject_cast<QPushButton*>(button(QWizard::CancelButton))->setEnabled(false);
}

void PackageManagerGui::showSettingsButton(bool show)
{
    if (d->m_showSettingsButton == show)
        return;

    d->m_showSettingsButton = show;
    setOption(QWizard::HaveCustomButton1, show);
    setButtonText(QWizard::CustomButton1, tr("Settings"));

    updateButtonLayout();
}

/*!
    Force an update of our own button layout, needs to be called whenever a button option has been set.
*/
void PackageManagerGui::updateButtonLayout()
{
    QVector<QWizard::WizardButton> buttons(12, QWizard::NoButton);
    if (options() & QWizard::HaveHelpButton)
        buttons[(options() & QWizard::HelpButtonOnRight) ? 11 : 0] = QWizard::HelpButton;

    buttons[1] = QWizard::Stretch;
    if (options() & QWizard::HaveCustomButton1) {
        buttons[1] = QWizard::CustomButton1;
        buttons[2] = QWizard::Stretch;
    }

    if (options() & QWizard::HaveCustomButton2)
        buttons[3] = QWizard::CustomButton2;

    if (options() & QWizard::HaveCustomButton3)
        buttons[4] = QWizard::CustomButton3;

    if (!(options() & QWizard::NoCancelButton))
        buttons[(options() & QWizard::CancelButtonOnLeft) ? 5 : 10] = QWizard::CancelButton;

    buttons[6] = QWizard::BackButton;
    buttons[7] = QWizard::NextButton;
    buttons[8] = QWizard::CommitButton;
    buttons[9] = QWizard::FinishButton;

    setOption(QWizard::NoBackButtonOnLastPage, true);
    setOption(QWizard::NoBackButtonOnStartPage, true);

    setButtonLayout(buttons.toList());
}

void PackageManagerGui::setSettingsButtonEnabled(bool enabled)
{
    if (QAbstractButton *btn = button(QWizard::CustomButton1))
        btn->setEnabled(enabled);
}

void PackageManagerGui::customButtonClicked(int which)
{
    if (QWizard::WizardButton(which) == QWizard::CustomButton1 && d->m_showSettingsButton)
        emit settingsButtonClicked();
}

void PackageManagerGui::dependsOnLocalInstallerBinary()
{
    if (m_core->settings().dependsOnLocalInstallerBinary() && !m_core->localInstallerBinaryUsed()) {
        MessageBoxHandler::critical(MessageBoxHandler::currentBestSuitParent(),
            QLatin1String("Installer_Needs_To_Be_Local_Error"), tr("Error"),
            tr("It is not possible to install from network location.\n"
               "Please copy the installer to a local drive"), QMessageBox::Ok);
        rejectWithoutPrompt();
    }
}


// -- PackageManagerPage

PackageManagerPage::PackageManagerPage(PackageManagerCore *core)
    : m_fresh(true)
    , m_complete(true)
    , m_core(core)
    , validatorComponent(0)
{
    setPixmap(QWizard::WatermarkPixmap, watermarkPixmap());
    setPixmap(QWizard::BannerPixmap, bannerPixmap());
    setPixmap(QWizard::LogoPixmap, logoPixmap());
}

PackageManagerCore *PackageManagerPage::packageManagerCore() const
{
    return m_core;
}

QPixmap PackageManagerPage::watermarkPixmap() const
{
    return QPixmap(m_core->value(QLatin1String("WatermarkPixmap")));
}

QPixmap PackageManagerPage::bannerPixmap() const
{
    return QPixmap(m_core->value(QLatin1String("BannerPixmap")));
}

QPixmap PackageManagerPage::logoPixmap() const
{
    return QPixmap(m_core->value(QLatin1String("LogoPixmap")));
}

QString PackageManagerPage::productName() const
{
    return m_core->value(QLatin1String("ProductName"));
}

bool PackageManagerPage::isComplete() const
{
    return m_complete;
}

void PackageManagerPage::setComplete(bool complete)
{
    m_complete = complete;
    if (QWizard *w = wizard()) {
        if (QAbstractButton *cancel = w->button(QWizard::CancelButton)) {
            if (cancel->hasFocus()) {
                if (QAbstractButton *next = w->button(QWizard::NextButton))
                    next->setFocus();
            }
        }
    }
    emit completeChanged();
}

void PackageManagerPage::setValidatePageComponent(Component *component)
{
    validatorComponent = component;
}

bool PackageManagerPage::validatePage()
{
    if (validatorComponent)
        return validatorComponent->validatePage();
    return true;
}

void PackageManagerPage::insertWidget(QWidget *widget, const QString &siblingName, int offset)
{
    QWidget *sibling = findChild<QWidget *>(siblingName);
    QWidget *parent = sibling ? sibling->parentWidget() : 0;
    QLayout *layout = parent ? parent->layout() : 0;
    QBoxLayout *blayout = qobject_cast<QBoxLayout *>(layout);

    if (blayout) {
        const int index = blayout->indexOf(sibling) + offset;
        blayout->insertWidget(index, widget);
    }
}

QWidget *PackageManagerPage::findWidget(const QString &objectName) const
{
    return findChild<QWidget*> (objectName);
}

/*!
    \reimp
    \Overwritten to support some kind of initializePage() in the case the wizard has been set
    to QWizard::IndependentPages. If that option has been set, initializePage() would be only called
    once. So we provide entering() and leaving() based on this overwritten function.
*/
void PackageManagerPage::setVisible(bool visible)
{
    QWizardPage::setVisible(visible);
    qApp->processEvents();

    if (m_fresh && !visible) {
        // this is only hit once when the page gets added to the wizard
        m_fresh = false;
        return;
    }

    if (visible)
        entering();
    else
        leaving();
}

int PackageManagerPage::nextId() const
{
    const int next = QWizardPage::nextId(); // the page to show next
    if (next == PackageManagerCore::LicenseCheck) {
        // calculate the page after the license page
        const int nextNextId = gui()->pageIds().value(gui()->pageIds().indexOf(next) + 1, -1);
        const PackageManagerCore *const core = packageManagerCore();
        if (core->isUninstaller())
            return nextNextId;  // forcibly hide the license page if we run as uninstaller

        core->calculateComponentsToInstall();
        foreach (Component* component, core->orderedComponentsToInstall()) {
            if ((core->isPackageManager() || core->isUpdater()) && component->isInstalled())
                continue;   // package manager or updater, hide as long as the component is installed

            if (!component->licenses().isEmpty())
                return next;    // we found a component not installed with a license, need to show the page
        }
        return nextNextId;  // no component with a license or all components with license installed
    }
    return next;    // default, show the next page
}

// -- IntroductionPage

IntroductionPage::IntroductionPage(PackageManagerCore *core)
    : PackageManagerPage(core)
    , m_widget(0)
{
    setObjectName(QLatin1String("IntroductionPage"));
    setTitle(tr("Setup - %1").arg(productName()));

    m_msgLabel = new QLabel(this);
    m_msgLabel->setWordWrap(true);
    m_msgLabel->setObjectName(QLatin1String("MessageLabel"));
    m_msgLabel->setText(tr("Welcome to the %1 Setup Wizard.").arg(productName()));

    QVBoxLayout *layout = new QVBoxLayout(this);
    setLayout(layout);
    layout->addWidget(m_msgLabel);
    layout->addItem(new QSpacerItem(20, 20, QSizePolicy::Minimum, QSizePolicy::Expanding));
}

void IntroductionPage::setWidget(QWidget *widget)
{
    if (m_widget) {
        layout()->removeWidget(m_widget);
        delete m_widget;
    }
    m_widget = widget;
    if (m_widget)
        static_cast<QVBoxLayout*>(layout())->addWidget(m_widget, 1);
}

void IntroductionPage::setText(const QString &text)
{
    m_msgLabel->setText(text);
}


// -- LicenseAgreementPage::ClickForwarder

class LicenseAgreementPage::ClickForwarder : public QObject
{
    Q_OBJECT

public:
    explicit ClickForwarder(QAbstractButton *button)
        : QObject(button)
        , m_abstractButton(button) {}

protected:
    bool eventFilter(QObject *object, QEvent *event)
    {
        if (event->type() == QEvent::MouseButtonRelease) {
            m_abstractButton->click();
            return true;
        }
        // standard event processing
        return QObject::eventFilter(object, event);
    }
private:
    QAbstractButton *m_abstractButton;
};


// -- LicenseAgreementPage

LicenseAgreementPage::LicenseAgreementPage(PackageManagerCore *core)
    : PackageManagerPage(core)
{
    setPixmap(QWizard::WatermarkPixmap, QPixmap());
    setObjectName(QLatin1String("LicenseAgreementPage"));
    setTitle(tr("License Agreement"));

    m_licenseListWidget = new QListWidget(this);
    m_licenseListWidget->setObjectName(QLatin1String("LicenseListWidget"));
    m_licenseListWidget->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Expanding);
    connect(m_licenseListWidget, SIGNAL(currentItemChanged(QListWidgetItem *, QListWidgetItem *)),
        this, SLOT(currentItemChanged(QListWidgetItem *)));

    m_textBrowser = new QTextBrowser(this);
    m_textBrowser->setReadOnly(true);
    m_textBrowser->setOpenLinks(false);
    m_textBrowser->setOpenExternalLinks(true);
    m_textBrowser->setObjectName(QLatin1String("LicenseTextBrowser"));
    m_textBrowser->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
    connect(m_textBrowser, SIGNAL(anchorClicked(QUrl)), this, SLOT(openLicenseUrl(QUrl)));

    QHBoxLayout *licenseBoxLayout = new QHBoxLayout();
    licenseBoxLayout->addWidget(m_licenseListWidget);
    licenseBoxLayout->addWidget(m_textBrowser);

    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addLayout(licenseBoxLayout);

    m_acceptRadioButton = new QRadioButton(this);
    m_acceptRadioButton->setShortcut(QKeySequence(tr("Alt+A", "agree license")));
    m_acceptRadioButton->setObjectName(QLatin1String("AcceptLicenseRadioButton"));
    ClickForwarder *acceptClickForwarder = new ClickForwarder(m_acceptRadioButton);

    m_acceptLabel = new QLabel;
    m_acceptLabel->setWordWrap(true);
    m_acceptLabel->installEventFilter(acceptClickForwarder);
    m_acceptLabel->setObjectName(QLatin1String("AcceptLicenseLabel"));
    m_acceptLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);

    m_rejectRadioButton = new QRadioButton(this);
    ClickForwarder *rejectClickForwarder = new ClickForwarder(m_rejectRadioButton);
    m_rejectRadioButton->setObjectName(QString::fromUtf8("RejectLicenseRadioButton"));
    m_rejectRadioButton->setShortcut(QKeySequence(tr("Alt+D", "do not agree license")));

    m_rejectLabel = new QLabel;
    m_rejectLabel->setWordWrap(true);
    m_rejectLabel->installEventFilter(rejectClickForwarder);
    m_rejectLabel->setObjectName(QLatin1String("RejectLicenseLabel"));
    m_rejectLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);

#ifdef Q_OS_UNIX
    QFont labelFont(font());
    labelFont.setPixelSize(9);
    m_acceptLabel->setFont(labelFont);
    m_rejectLabel->setFont(labelFont);
#endif

    QGridLayout *gridLayout = new QGridLayout;
    gridLayout->setColumnStretch(1, 1);
    gridLayout->addWidget(m_acceptRadioButton, 0, 0);
    gridLayout->addWidget(m_acceptLabel, 0, 1);
    gridLayout->addWidget(m_rejectRadioButton, 1, 0);
    gridLayout->addWidget(m_rejectLabel, 1, 1);
    layout->addLayout(gridLayout);

    connect(m_acceptRadioButton, SIGNAL(toggled(bool)), this, SIGNAL(completeChanged()));
    connect(m_rejectRadioButton, SIGNAL(toggled(bool)), this, SIGNAL(completeChanged()));

    m_rejectRadioButton->setChecked(true);
}

void LicenseAgreementPage::entering()
{
    m_licenseListWidget->clear();
    m_textBrowser->setText(QString());
    m_licenseListWidget->setVisible(false);

    packageManagerCore()->calculateComponentsToInstall();
    foreach (QInstaller::Component *component, packageManagerCore()->orderedComponentsToInstall())
        addLicenseItem(component->licenses());

    const int licenseCount = m_licenseListWidget->count();
    if (licenseCount > 0) {
        m_licenseListWidget->setVisible(licenseCount > 1);
        m_licenseListWidget->setCurrentItem(m_licenseListWidget->item(0));
    }

    updateUi();
}

bool LicenseAgreementPage::isComplete() const
{
    return m_acceptRadioButton->isChecked();
}

void LicenseAgreementPage::openLicenseUrl(const QUrl &url)
{
    QDesktopServices::openUrl(url);
}

void LicenseAgreementPage::currentItemChanged(QListWidgetItem *current)
{
    if (current)
        m_textBrowser->setText(current->data(Qt::UserRole).toString());
}

void LicenseAgreementPage::addLicenseItem(const QHash<QString, QPair<QString, QString> > &hash)
{
    for (QHash<QString, QPair<QString, QString> >::const_iterator it = hash.begin();
        it != hash.end(); ++it) {
            QListWidgetItem *item = new QListWidgetItem(it.key(), m_licenseListWidget);
            item->setData(Qt::UserRole, it.value().second);
    }
}

void LicenseAgreementPage::updateUi()
{
    QString subTitleText;
    QString acceptButtonText;
    QString rejectButtonText;
    if (m_licenseListWidget->count() == 1) {
        subTitleText = tr("Please read the following license agreement. You must accept the terms "
                          "contained in this agreement before continuing with the installation.");
        acceptButtonText = tr("I accept the license.");
        rejectButtonText = tr("I do not accept the license.");
    } else {
        subTitleText = tr("Please read the following license agreements. You must accept the terms "
                          "contained in these agreements before continuing with the installation.");
        acceptButtonText = tr("I accept the licenses.");
        rejectButtonText = tr("I do not accept the licenses.");
    }

    setSubTitle(subTitleText);

    m_acceptLabel->setText(acceptButtonText);
    m_rejectLabel->setText(rejectButtonText);

}


// -- ComponentSelectionPage::Private

class ComponentSelectionPage::Private : public QObject
{
    Q_OBJECT

public:
    Private(ComponentSelectionPage *qq, PackageManagerCore *core)
        : q(qq)
        , m_core(core)
        , m_treeView(new QTreeView(q))
        , m_allModel(m_core->defaultComponentModel())
        , m_updaterModel(m_core->updaterComponentModel())
        , m_currentModel(m_allModel)
    {
        m_treeView->setObjectName(QLatin1String("ComponentsTreeView"));

        connect(m_allModel, SIGNAL(checkStateChanged(QInstaller::ComponentModel::ModelState)), this,
            SLOT(onCheckStateChanged(QInstaller::ComponentModel::ModelState)));
        connect(m_updaterModel, SIGNAL(checkStateChanged(QInstaller::ComponentModel::ModelState)), this,
            SLOT(onCheckStateChanged(QInstaller::ComponentModel::ModelState)));

        QHBoxLayout *hlayout = new QHBoxLayout;
        hlayout->addWidget(m_treeView, 3);

        m_descriptionLabel = new QLabel(q);
        m_descriptionLabel->setWordWrap(true);
        m_descriptionLabel->setObjectName(QLatin1String("ComponentDescriptionLabel"));

        QVBoxLayout *vlayout = new QVBoxLayout;
        vlayout->addWidget(m_descriptionLabel);

        m_sizeLabel = new QLabel(q);
        m_sizeLabel->setWordWrap(true);
        vlayout->addWidget(m_sizeLabel);
        m_sizeLabel->setObjectName(QLatin1String("ComponentSizeLabel"));

        vlayout->addSpacerItem(new QSpacerItem(1, 1, QSizePolicy::MinimumExpanding,
            QSizePolicy::MinimumExpanding));
        hlayout->addLayout(vlayout, 2);

        QVBoxLayout *layout = new QVBoxLayout(q);
        layout->addLayout(hlayout, 1);

        m_checkDefault = new QPushButton;
        connect(m_checkDefault, SIGNAL(clicked()), this, SLOT(selectDefault()));
        if (m_core->isInstaller()) {
            m_checkDefault->setObjectName(QLatin1String("SelectDefaultComponentsButton"));
            m_checkDefault->setShortcut(QKeySequence(ComponentSelectionPage::tr("Alt+A", "select default components")));
            m_checkDefault->setText(ComponentSelectionPage::tr("Def&ault"));
        } else {
            m_checkDefault->setEnabled(false);
            m_checkDefault->setObjectName(QLatin1String("ResetComponentsButton"));
            m_checkDefault->setShortcut(QKeySequence(ComponentSelectionPage::tr("Alt+R", "reset to already installed components")));
            m_checkDefault->setText(ComponentSelectionPage::tr("&Reset"));
        }
        hlayout = new QHBoxLayout;
        hlayout->addWidget(m_checkDefault);

        m_checkAll = new QPushButton;
        hlayout->addWidget(m_checkAll);
        connect(m_checkAll, SIGNAL(clicked()), this, SLOT(selectAll()));
        m_checkAll->setObjectName(QLatin1String("SelectAllComponentsButton"));
        m_checkAll->setShortcut(QKeySequence(ComponentSelectionPage::tr("Alt+S", "select all components")));
        m_checkAll->setText(ComponentSelectionPage::tr("&Select All"));

        m_uncheckAll = new QPushButton;
        hlayout->addWidget(m_uncheckAll);
        connect(m_uncheckAll, SIGNAL(clicked()), this, SLOT(deselectAll()));
        m_uncheckAll->setObjectName(QLatin1String("DeselectAllComponentsButton"));
        m_uncheckAll->setShortcut(QKeySequence(ComponentSelectionPage::tr("Alt+D", "deselect all components")));
        m_uncheckAll->setText(ComponentSelectionPage::tr("&Deselect All"));

        hlayout->addSpacerItem(new QSpacerItem(1, 1, QSizePolicy::MinimumExpanding,
            QSizePolicy::MinimumExpanding));
        layout->addLayout(hlayout);
    }

    void updateTreeView()
    {
        m_checkDefault->setVisible(m_core->isInstaller() || m_core->isPackageManager());
        if (m_treeView->selectionModel()) {
            disconnect(m_currentModel, SIGNAL(checkStateChanged(QModelIndex)), this,
                SLOT(currentCheckedChanged(QModelIndex)));
            disconnect(m_treeView->selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)),
                this, SLOT(currentSelectedChanged(QModelIndex)));
        }

        m_currentModel = m_core->isUpdater() ? m_updaterModel : m_allModel;
        m_treeView->setModel(m_currentModel);
        m_treeView->setExpanded(m_currentModel->index(0, 0), true);

        if (m_core->isInstaller()) {
            m_treeView->setHeaderHidden(true);
            for (int i = 1; i < m_currentModel->columnCount(); ++i)
                m_treeView->hideColumn(i);
        } else {
            m_treeView->header()->setStretchLastSection(true);
            for (int i = 0; i < m_currentModel->columnCount(); ++i)
                m_treeView->resizeColumnToContents(i);
        }

        bool hasChildren = false;
        const int rowCount = m_currentModel->rowCount();
        for (int row = 0; row < rowCount && !hasChildren; ++row)
            hasChildren = m_currentModel->hasChildren(m_currentModel->index(row, 0));
        m_treeView->setRootIsDecorated(hasChildren);

        connect(m_currentModel, SIGNAL(checkStateChanged(QModelIndex)), this,
            SLOT(currentCheckedChanged(QModelIndex)));
        connect(m_treeView->selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)),
            this, SLOT(currentSelectedChanged(QModelIndex)));

        m_treeView->setCurrentIndex(m_currentModel->index(0, 0));
    }

public slots:
    void currentCheckedChanged(const QModelIndex &current)
    {
        if (m_treeView->selectionModel()->currentIndex() == current)
            currentSelectedChanged(current);
    }

    void currentSelectedChanged(const QModelIndex &current)
    {
        if (!current.isValid())
            return;

        m_sizeLabel->setText(QString());
        m_descriptionLabel->setText(m_currentModel->data(m_currentModel->index(current.row(),
            ComponentModelHelper::NameColumn, current.parent()), Qt::ToolTipRole).toString());

        Component *component = m_currentModel->componentFromIndex(current);
        if ((m_core->isUninstaller()) || (!component))
            return;

        if ((component->checkState() != Qt::Unchecked) && (component->updateUncompressedSize() > 0)) {
            m_sizeLabel->setText(ComponentSelectionPage::tr("This component "
                "will occupy approximately %1 on your hard disk drive.")
                .arg(humanReadableSize(component->value(scUncompressedSizeSum).toLongLong())));
        }
    }

    void selectAll()
    {
        m_currentModel->setCheckedState(ComponentModel::AllChecked);
    }

    void deselectAll()
    {
        m_currentModel->setCheckedState(ComponentModel::AllUnchecked);
    }

    void selectDefault()
    {
        m_currentModel->setCheckedState(ComponentModel::DefaultChecked);
    }

    void onCheckStateChanged(QInstaller::ComponentModel::ModelState state)
    {
        q->setModified(state != ComponentModel::DefaultChecked);

        // If all components in the checked list are only checkable when run without forced installation, set
        // ComponentModel::AllUnchecked as well, as we cannot uncheck anything. Helps to keep the UI correct.
        if ((!m_core->noForceInstallation()) && (m_currentModel->checked() == m_currentModel->uncheckable()))
                state |= ComponentModel::AllUnchecked;

        // enable the button if the corresponding flag is not set
        m_checkAll->setEnabled(state.testFlag(ComponentModel::AllChecked) == false);
        m_uncheckAll->setEnabled(state.testFlag(ComponentModel::AllUnchecked) == false);
        m_checkDefault->setEnabled(state.testFlag(ComponentModel::DefaultChecked) == false);
    }

public:
    ComponentSelectionPage *q;
    PackageManagerCore *m_core;
    QTreeView *m_treeView;
    ComponentModel *m_allModel;
    ComponentModel *m_updaterModel;
    ComponentModel *m_currentModel;
    QLabel *m_sizeLabel;
    QLabel *m_descriptionLabel;
    QPushButton *m_checkAll;
    QPushButton *m_uncheckAll;
    QPushButton *m_checkDefault;
};


// -- ComponentSelectionPage

/*!
    \class QInstaller::ComponentSelectionPage
    On this page the user can select and deselect what he wants to be installed.
*/
ComponentSelectionPage::ComponentSelectionPage(PackageManagerCore *core)
    : PackageManagerPage(core)
    , d(new Private(this, core))
{
    setPixmap(QWizard::WatermarkPixmap, QPixmap());
    setObjectName(QLatin1String("ComponentSelectionPage"));
    setTitle(tr("Select Components"));
}

ComponentSelectionPage::~ComponentSelectionPage()
{
    delete d;
}

void ComponentSelectionPage::entering()
{
    static const char *strings[] = {
        QT_TR_NOOP("Please select the components you want to update."),
        QT_TR_NOOP("Please select the components you want to install."),
        QT_TR_NOOP("Please select the components you want to uninstall."),
        QT_TR_NOOP("Select the components to install. Deselect installed components to uninstall them.")
     };

    int index = 0;
    PackageManagerCore *core = packageManagerCore();
    if (core->isInstaller()) index = 1;
    if (core->isUninstaller()) index = 2;
    if (core->isPackageManager()) index = 3;
    setSubTitle(tr(strings[index]));

    d->updateTreeView();
    setModified(isComplete());
}

void ComponentSelectionPage::showEvent(QShowEvent *event)
{
    // remove once we deprecate isSelected, setSelected etc...
    if (!event->spontaneous())
        packageManagerCore()->resetComponentsToUserCheckedState();
    QWizardPage::showEvent(event);
}

void ComponentSelectionPage::selectAll()
{
    d->selectAll();
}

void ComponentSelectionPage::deselectAll()
{
    d->deselectAll();
}

void ComponentSelectionPage::selectDefault()
{
    if (packageManagerCore()->isInstaller())
        d->selectDefault();
}

/*!
    Selects the component with /a id in the component tree.
*/
void ComponentSelectionPage::selectComponent(const QString &id)
{
    const QModelIndex &idx = d->m_currentModel->indexFromComponentName(id);
    if (idx.isValid())
        d->m_currentModel->setData(idx, Qt::Checked, Qt::CheckStateRole);
}

/*!
    Deselects the component with /a id in the component tree.
*/
void ComponentSelectionPage::deselectComponent(const QString &id)
{
    const QModelIndex &idx = d->m_currentModel->indexFromComponentName(id);
    if (idx.isValid())
        d->m_currentModel->setData(idx, Qt::Unchecked, Qt::CheckStateRole);
}

void ComponentSelectionPage::setModified(bool modified)
{
    setComplete(modified);
}

bool ComponentSelectionPage::isComplete() const
{
    if (packageManagerCore()->isInstaller() || packageManagerCore()->isUpdater())
        return d->m_currentModel->checked().count();
    return d->m_currentModel->checkedState() != ComponentModel::DefaultChecked;
}


// -- TargetDirectoryPage

TargetDirectoryPage::TargetDirectoryPage(PackageManagerCore *core)
    : PackageManagerPage(core)
{
    setPixmap(QWizard::WatermarkPixmap, QPixmap());
    setObjectName(QLatin1String("TargetDirectoryPage"));
    setTitle(tr("Installation Folder"));

    QVBoxLayout *layout = new QVBoxLayout(this);

    QLabel *msgLabel = new QLabel(this);
    msgLabel->setWordWrap(true);
    msgLabel->setObjectName(QLatin1String("MessageLabel"));
    msgLabel->setText(tr("Please specify the folder where %1 will be installed.").arg(productName()));
    layout->addWidget(msgLabel);

    QHBoxLayout *hlayout = new QHBoxLayout;

    m_lineEdit = new QLineEdit(this);
    m_lineEdit->setObjectName(QLatin1String("TargetDirectoryLineEdit"));
    connect(m_lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(completeChanged()));
    hlayout->addWidget(m_lineEdit);

    QPushButton *browseButton = new QPushButton(this);
    browseButton->setObjectName(QLatin1String("BrowseDirectoryButton"));
    connect(browseButton, SIGNAL(clicked()), this, SLOT(dirRequested()));
    browseButton->setShortcut(QKeySequence(tr("Alt+R", "browse file system to choose a file")));
    browseButton->setText(tr("B&rowse..."));
    hlayout->addWidget(browseButton);

    layout->addLayout(hlayout);
    setLayout(layout);
}

QString TargetDirectoryPage::targetDir() const
{
    return m_lineEdit->text();
}

void TargetDirectoryPage::setTargetDir(const QString &dirName)
{
    m_lineEdit->setText(dirName);
}

void TargetDirectoryPage::initializePage()
{
    QString targetDir = packageManagerCore()->value(scTargetDir);
    if (targetDir.isEmpty()) {
        targetDir = QDir::homePath() + QDir::separator();
        // prevent spaces in the default target directory
        if (targetDir.contains(QLatin1Char(' ')))
            targetDir = QDir::rootPath();
        targetDir += productName().remove(QLatin1Char(' '));
    }
    m_lineEdit->setText(QDir::toNativeSeparators(QDir(targetDir).absolutePath()));

    PackageManagerPage::initializePage();
}

bool TargetDirectoryPage::validatePage()
{
    if (targetDir().isEmpty()) {
        MessageBoxHandler::critical(MessageBoxHandler::currentBestSuitParent(),
            QLatin1String("EmptyTargetDirectoryMessage"), tr("Error"), tr("The install directory cannot be "
            "empty, please specify a valid folder."), QMessageBox::Ok);
        return false;
    }

    const QDir dir(targetDir());
    // it exists, but is empty (might be created by the Browse button (getExistingDirectory)
    if (dir.exists() && dir.entryList(QDir::NoDotAndDotDot).isEmpty())
        return true;

    if (dir.exists() && dir.isReadable()) {
        // it exists, but is not empty
        if (dir == QDir::root()) {
            MessageBoxHandler::critical(MessageBoxHandler::currentBestSuitParent(),
                QLatin1String("ForbiddenTargetDirectoryMessage"), tr("Error"), tr("As the install directory "
                "is completely deleted on uninstall, installing in %1 is forbidden.").arg(QDir::rootPath()),
                QMessageBox::Ok);
            return false;
        }

        if (!QVariant(packageManagerCore()->value(scRemoveTargetDir)).toBool())
            return true;

        return MessageBoxHandler::critical(MessageBoxHandler::currentBestSuitParent(),
            QLatin1String("OverwriteTargetDirectoryMessage"), tr("Warning"), tr("You have selected an existing, "
            "non-empty folder for installation. Note that it will be completely wiped on uninstallation of "
            "this application. It is not advisable to install into this folder as installation might fail. "
            "Do you want to continue?"), QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes;
    }
    return true;
}

void TargetDirectoryPage::entering()
{
}

void TargetDirectoryPage::leaving()
{
    packageManagerCore()->setValue(scTargetDir, targetDir());
}

void TargetDirectoryPage::targetDirSelected()
{
}

void TargetDirectoryPage::dirRequested()
{
    const QString newDirName = QFileDialog::getExistingDirectory(this, tr("Select Installation Folder"),
        targetDir());
    if (newDirName.isEmpty() || newDirName == targetDir())
        return;
    m_lineEdit->setText(QDir::toNativeSeparators(newDirName));
}


// -- StartMenuDirectoryPage

StartMenuDirectoryPage::StartMenuDirectoryPage(PackageManagerCore *core)
    : PackageManagerPage(core)
{
    setPixmap(QWizard::WatermarkPixmap, QPixmap());
    setObjectName(QLatin1String("StartMenuDirectoryPage"));
    setTitle(tr("Start Menu shortcuts"));
    setSubTitle(tr("Select the Start Menu in which you would like to create the program's shortcuts. You can "
                   "also enter a name to create a new folder."));

    m_lineEdit = new QLineEdit(this);
    m_lineEdit->setObjectName(QLatin1String("LineEdit"));

    QString startMenuDir = core->value(scStartMenuDir);
    if (startMenuDir.isEmpty())
        startMenuDir = productName();
    m_lineEdit->setText(startMenuDir);

    // grab existing start menu folders
    QSettings user(QLatin1String("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\"
        "Explorer\\User Shell Folders"), QSettings::NativeFormat);
    // User Shell Folders uses %USERPROFILE%
    startMenuPath = replaceWindowsEnvironmentVariables(user.value(QLatin1String("Programs"), QString())
        .toString());
    core->setValue(QLatin1String("DesktopDir"), replaceWindowsEnvironmentVariables(user
        .value(QLatin1String("Desktop")).toString()));

    QDir dir(startMenuPath); // user only dirs
    QStringList dirs = dir.entryList(QDir::AllDirs | QDir::NoDotAndDotDot);

    if (core->value(QLatin1String("AllUsers")) == QLatin1String("true")) {
        qDebug() << "AllUsers set. Using HKEY_LOCAL_MACHINE";
        QSettings system(QLatin1String("HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\"
            "Explorer\\Shell Folders"), QSettings::NativeFormat);
        startMenuPath = system.value(QLatin1String("Common Programs"), QString()).toString();
        core->setValue(QLatin1String("DesktopDir"),system.value(QLatin1String("Desktop")).toString());

        dir.setPath(startMenuPath); // system only dirs
        dirs += dir.entryList(QDir::AllDirs | QDir::NoDotAndDotDot);
    }

    qDebug() << "StartMenuPath: \t" << startMenuPath;
    qDebug() << "DesktopDir: \t" << core->value(QLatin1String("DesktopDir"));

    m_listWidget = new QListWidget(this);
    if (!dirs.isEmpty()) {
        dirs.removeDuplicates();
        foreach (const QString &dir, dirs)
            new QListWidgetItem(dir, m_listWidget);
    }

    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(m_lineEdit);
    layout->addWidget(m_listWidget);

    setLayout(layout);

    connect(m_listWidget, SIGNAL(currentItemChanged(QListWidgetItem*, QListWidgetItem*)), this,
        SLOT(currentItemChanged(QListWidgetItem*)));
}

QString StartMenuDirectoryPage::startMenuDir() const
{
    return m_lineEdit->text();
}

void StartMenuDirectoryPage::setStartMenuDir(const QString &startMenuDir)
{
    m_lineEdit->setText(startMenuDir);
}

void StartMenuDirectoryPage::leaving()
{
    packageManagerCore()->setValue(scStartMenuDir, startMenuPath + QDir::separator() + startMenuDir());
}

void StartMenuDirectoryPage::currentItemChanged(QListWidgetItem *current)
{
    if (current) {
        QString dir = current->data(Qt::DisplayRole).toString();
        if (!dir.isEmpty())
            dir += QDir::separator();
        setStartMenuDir(dir + packageManagerCore()->value(scStartMenuDir));
    }
}


// -- ReadyForInstallationPage

ReadyForInstallationPage::ReadyForInstallationPage(PackageManagerCore *core)
    : PackageManagerPage(core)
    , m_msgLabel(new QLabel)
{
    setPixmap(QWizard::WatermarkPixmap, QPixmap());
    setObjectName(QLatin1String("ReadyForInstallationPage"));

    QVBoxLayout *baseLayout = new QVBoxLayout();
    baseLayout->setObjectName(QLatin1String("BaseLayout"));

    QVBoxLayout *topLayout = new QVBoxLayout();
    topLayout->setObjectName(QLatin1String("TopLayout"));

    m_msgLabel->setWordWrap(true);
    m_msgLabel->setObjectName(QLatin1String("MessageLabel"));
    m_msgLabel->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    topLayout->addWidget(m_msgLabel);
    baseLayout->addLayout(topLayout);

    m_taskDetailsButton = new QPushButton(tr("&Show Details"), this);
    m_taskDetailsButton->setObjectName(QLatin1String("TaskDetailsButton"));
    m_taskDetailsButton->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Fixed);
    connect(m_taskDetailsButton, SIGNAL(clicked()), this, SLOT(toggleDetails()));
    topLayout->addWidget(m_taskDetailsButton);

    QVBoxLayout *bottomLayout = new QVBoxLayout();
    bottomLayout->setObjectName(QLatin1String("BottomLayout"));
    bottomLayout->addStretch();

    m_taskDetailsBrowser = new QTextBrowser(this);
    m_taskDetailsBrowser->setReadOnly(true);
    m_taskDetailsBrowser->setObjectName(QLatin1String("TaskDetailsBrowser"));
    m_taskDetailsBrowser->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_taskDetailsBrowser->setVisible(false);
    bottomLayout->addWidget(m_taskDetailsBrowser);
    bottomLayout->setStretch(1, 10);
    baseLayout->addLayout(bottomLayout);

    setLayout(baseLayout);
}


/*!
    \reimp
*/
void ReadyForInstallationPage::entering()
{
    setCommitPage(false);

    if (packageManagerCore()->isUninstaller()) {
        m_taskDetailsButton->setVisible(false);
        m_taskDetailsBrowser->setVisible(false);
        setButtonText(QWizard::CommitButton, tr("U&ninstall"));
        setTitle(tr("Ready to Uninstall"));
        m_msgLabel->setText(tr("Setup is now ready to begin removing %1 from your computer.<br>"
            "<font color=\"red\">The program directory %2 will be deleted completely</font>, "
            "including all content in that directory!")
            .arg(productName(), QDir::toNativeSeparators(QDir(packageManagerCore()->value(scTargetDir))
            .absolutePath())));
        setCommitPage(true);
        return;
    } else if (packageManagerCore()->isPackageManager() || packageManagerCore()->isUpdater()) {
        setButtonText(QWizard::CommitButton, tr("U&pdate"));
        setTitle(tr("Ready to Update Packages"));
        m_msgLabel->setText(tr("Setup is now ready to begin updating your installation."));
    } else {
        Q_ASSERT(packageManagerCore()->isInstaller());
        setButtonText(QWizard::CommitButton, tr("&Install"));
        setTitle(tr("Ready to Install"));
        m_msgLabel->setText(tr("Setup is now ready to begin installing %1 on your computer.")
            .arg(productName()));
    }

    refreshTaskDetailsBrowser();

    const VolumeInfo tempVolume = VolumeInfo::fromPath(QDir::tempPath());
    const VolumeInfo targetVolume = VolumeInfo::fromPath(packageManagerCore()->value(scTargetDir));

    const quint64 tempVolumeAvailableSize = tempVolume.availableSize();
    const quint64 installVolumeAvailableSize = targetVolume.availableSize();

    // at the moment there is no better way to check this
    if (targetVolume.size() == 0 && installVolumeAvailableSize == 0) {
        qDebug() << QString::fromLatin1("Could not determine available space on device. Volume descriptor: %1,"
            "Mount path: %2. Continue silently.").arg(targetVolume.volumeDescriptor(), targetVolume.mountPath());
        setCommitPage(true);
        return;     // TODO: Shouldn't this also disable the "Next" button?
    }

    const bool tempOnSameVolume = (targetVolume == tempVolume);
    if (tempOnSameVolume) {
        qDebug() << "Tmp and install folder are on the same volume. Volume mount point:" << targetVolume
            .mountPath() << "Free space available:" << humanReadableSize(installVolumeAvailableSize);
    } else {
        qDebug() << "Tmp is on a different volume than the install folder. Tmp volume mount point:"
            << tempVolume.mountPath() << "Free space available:" << humanReadableSize(tempVolumeAvailableSize)
            << "Install volume mount point:" << targetVolume.mountPath() << "Free space "
            "available:" << humanReadableSize(installVolumeAvailableSize);
    }

    const quint64 extraSpace = 256 * 1024 * 1024LL;
    quint64 required(packageManagerCore()->requiredDiskSpace());
    quint64 tempRequired(packageManagerCore()->requiredTemporaryDiskSpace());
    if (required < extraSpace) {
        required += 0.1 * required;
        tempRequired += 0.1 * tempRequired;
    } else {
        required += extraSpace;
        tempRequired += extraSpace;
    }

    quint64 repositorySize = 0;
    const bool createLocalRepository = packageManagerCore()->createLocalRepositoryFromBinary();
    if (createLocalRepository) {
        repositorySize = QFile(QCoreApplication::applicationFilePath()).size();
        required += repositorySize; // if we create a local repository, take that space into account as well
    }

    qDebug() << "Installation space required:" << humanReadableSize(required) << "Temporary space required:"
        << humanReadableSize(tempRequired) << "Local repository size:" << humanReadableSize(repositorySize);

    if (tempOnSameVolume && (installVolumeAvailableSize <= (required + tempRequired))) {
        m_msgLabel->setText(tr("Not enough disk space to store temporary files and the installation! "
            "Available space: %1, at least required %2.").arg(humanReadableSize(installVolumeAvailableSize),
            humanReadableSize(required + tempRequired)));
        return;
    }

    if (installVolumeAvailableSize < required) {
        m_msgLabel->setText(tr("Not enough disk space to store all selected components! Available space: %1, "
            "at least required: %2.").arg(humanReadableSize(installVolumeAvailableSize),
            humanReadableSize(required)));
        return;
    }

    if (tempVolumeAvailableSize < tempRequired) {
        m_msgLabel->setText(tr("Not enough disk space to store temporary files! Available space: %1, at "
            "least required: %2.").arg(humanReadableSize(tempVolumeAvailableSize),
            humanReadableSize(tempRequired)));
        return;
    }

    if (installVolumeAvailableSize - required < 0.01 * targetVolume.size()) {
        // warn for less than 1% of the volume's space being free
        m_msgLabel->setText(tr("The volume you selected for installation seems to have sufficient space for "
            "installation, but there will be less than 1% of the volume's space available afterwards. %1")
            .arg(m_msgLabel->text()));
    } else if (installVolumeAvailableSize - required < 100 * 1024 * 1024LL) {
        // warn for less than 100MB being free
        m_msgLabel->setText(tr("The volume you selected for installation seems to have sufficient space for "
            "installation, but there will be less than 100 MB available afterwards. %1")
            .arg(m_msgLabel->text()));
    }
    setCommitPage(true);
}

void ReadyForInstallationPage::refreshTaskDetailsBrowser()
{
    QString htmlOutput;
    QString lastInstallReason;
    if (!packageManagerCore()->calculateComponentsToUninstall() ||
        !packageManagerCore()->calculateComponentsToInstall()) {
            htmlOutput.append(QString::fromLatin1("<h2><font color=\"red\">%1</font></h2><ul>")
                .arg(tr("Can not resolve all dependencies!")));
            //if we have a missing dependency or a recursion we can display it
            if (!packageManagerCore()->componentsToInstallError().isEmpty()) {
                htmlOutput.append(QString::fromLatin1("<li> %1 </li>").arg(
                    packageManagerCore()->componentsToInstallError()));
            }
            htmlOutput.append(QLatin1String("</ul>"));
            m_taskDetailsBrowser->setHtml(htmlOutput);
            if (!m_taskDetailsBrowser->isVisible())
                toggleDetails();
            setCommitPage(false);
            return;
    }

    // In case of updater mode we don't uninstall components.
    if (!packageManagerCore()->isUpdater()) {
        QList<Component*> componentsToRemove = packageManagerCore()->componentsToUninstall();
        if (!componentsToRemove.isEmpty()) {
            htmlOutput.append(QString::fromLatin1("<h3>%1</h3><ul>").arg(tr("Components about to be removed.")));
            foreach (Component *component, componentsToRemove)
                htmlOutput.append(QString::fromLatin1("<li> %1 </li>").arg(component->name()));
            htmlOutput.append(QLatin1String("</ul>"));
        }
    }

    foreach (Component *component, packageManagerCore()->orderedComponentsToInstall()) {
        const QString installReason = packageManagerCore()->installReason(component);
        if (lastInstallReason != installReason) {
            if (!lastInstallReason.isEmpty()) // means we had to close the previous list
                htmlOutput.append(QLatin1String("</ul>"));
            htmlOutput.append(QString::fromLatin1("<h3>%1</h3><ul>").arg(installReason));
            lastInstallReason = installReason;
        }
        htmlOutput.append(QString::fromLatin1("<li> %1 </li>").arg(component->name()));
    }
    m_taskDetailsBrowser->setHtml(htmlOutput);
}

void ReadyForInstallationPage::toggleDetails()
{
    const bool visible = !m_taskDetailsBrowser->isVisible();
    m_taskDetailsBrowser->setVisible(visible);
    m_taskDetailsButton->setText(visible ? tr("&Hide Details") : tr("&Show Details"));
}

void ReadyForInstallationPage::leaving()
{
    setButtonText(QWizard::CommitButton, gui()->defaultButtonText(QWizard::CommitButton));
}

/*!
    \reimp
*/
bool ReadyForInstallationPage::isComplete() const
{
    return isCommitPage();
}


// -- PerformInstallationPage

/*!
    \class QInstaller::PerformInstallationPage
    On this page the user can see on a progress bar how far the current installation is.
*/
PerformInstallationPage::PerformInstallationPage(PackageManagerCore *core)
    : PackageManagerPage(core)
    , m_performInstallationForm(new PerformInstallationForm(this))
{
    setPixmap(QWizard::WatermarkPixmap, QPixmap());
    setObjectName(QLatin1String("PerformInstallationPage"));

    m_performInstallationForm->setupUi(this);

    connect(ProgressCoordinator::instance(), SIGNAL(detailTextChanged(QString)), m_performInstallationForm,
        SLOT(appendProgressDetails(QString)));
    connect(ProgressCoordinator::instance(), SIGNAL(detailTextResetNeeded()), m_performInstallationForm,
        SLOT(clearDetailsBrowser()));
    connect(m_performInstallationForm, SIGNAL(showDetailsChanged()), this, SLOT(toggleDetailsWereChanged()));

    connect(core, SIGNAL(installationStarted()), this, SLOT(installationStarted()));
    connect(core, SIGNAL(installationFinished()), this, SLOT(installationFinished()));

    connect(core, SIGNAL(uninstallationStarted()), this, SLOT(uninstallationStarted()));
    connect(core, SIGNAL(uninstallationFinished()), this, SLOT(uninstallationFinished()));

    connect(core, SIGNAL(titleMessageChanged(QString)), this, SLOT(setTitleMessage(QString)));
    connect(this, SIGNAL(setAutomatedPageSwitchEnabled(bool)), core,
        SIGNAL(setAutomatedPageSwitchEnabled(bool)));

    m_performInstallationForm->setDetailsWidgetVisible(true);
}

PerformInstallationPage::~PerformInstallationPage()
{
    delete m_performInstallationForm;
}

bool PerformInstallationPage::isAutoSwitching() const
{
    return !m_performInstallationForm->isShowingDetails();
}

// -- protected

void PerformInstallationPage::entering()
{
    setComplete(false);
    setCommitPage(true);

    if (packageManagerCore()->isUninstaller()) {
        setButtonText(QWizard::CommitButton, tr("&Uninstall"));
        setTitle(tr("Uninstalling %1").arg(productName()));

        QTimer::singleShot(30, packageManagerCore(), SLOT(runUninstaller()));
    } else if (packageManagerCore()->isPackageManager() || packageManagerCore()->isUpdater()) {
        setButtonText(QWizard::CommitButton, tr("&Update"));
        setTitle(tr("Updating components of %1").arg(productName()));

        QTimer::singleShot(30, packageManagerCore(), SLOT(runPackageUpdater()));
    } else {
        setButtonText(QWizard::CommitButton, tr("&Install"));
        setTitle(tr("Installing %1").arg(productName()));

        QTimer::singleShot(30, packageManagerCore(), SLOT(runInstaller()));
    }

    m_performInstallationForm->enableDetails();
    emit setAutomatedPageSwitchEnabled(true);
}

void PerformInstallationPage::leaving()
{
    setButtonText(QWizard::CommitButton, gui()->defaultButtonText(QWizard::CommitButton));
}

// -- public slots

void PerformInstallationPage::setTitleMessage(const QString &title)
{
    setTitle(title);
}

// -- private slots

void PerformInstallationPage::installationStarted()
{
    m_performInstallationForm->startUpdateProgress();
}

void PerformInstallationPage::installationFinished()
{
    m_performInstallationForm->stopUpdateProgress();
    if (!isAutoSwitching()) {
        m_performInstallationForm->scrollDetailsToTheEnd();
        m_performInstallationForm->setDetailsButtonEnabled(false);

        setComplete(true);
        setButtonText(QWizard::CommitButton, gui()->defaultButtonText(QWizard::NextButton));
    }
}

void PerformInstallationPage::uninstallationStarted()
{
    m_performInstallationForm->startUpdateProgress();
    if (QAbstractButton *cancel = gui()->button(QWizard::CancelButton))
        cancel->setEnabled(false);
}

void PerformInstallationPage::uninstallationFinished()
{
    installationFinished();
    if (QAbstractButton *cancel = gui()->button(QWizard::CancelButton))
        cancel->setEnabled(false);
}

void PerformInstallationPage::toggleDetailsWereChanged()
{
    emit setAutomatedPageSwitchEnabled(isAutoSwitching());
}


// -- FinishedPage

FinishedPage::FinishedPage(PackageManagerCore *core)
    : PackageManagerPage(core)
    , m_commitButton(0)
{
    setObjectName(QLatin1String("FinishedPage"));
    setTitle(tr("Completing the %1 Wizard").arg(productName()));

    m_msgLabel = new QLabel(this);
    m_msgLabel->setWordWrap(true);
    m_msgLabel->setObjectName(QLatin1String("MessageLabel"));

#ifdef Q_OS_MAC
    m_msgLabel->setText(tr("Click Done to exit the %1 Wizard.").arg(productName()));
#else
    m_msgLabel->setText(tr("Click Finish to exit the %1 Wizard.").arg(productName()));
#endif

    m_runItCheckBox = new QCheckBox(this);
    m_runItCheckBox->setObjectName(QLatin1String("RunItCheckBox"));
    m_runItCheckBox->setChecked(true);

    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(m_msgLabel);
    layout->addWidget(m_runItCheckBox);
    setLayout(layout);
}

void FinishedPage::entering()
{
    if (m_commitButton) {
        disconnect(m_commitButton, SIGNAL(clicked()), this, SLOT(handleFinishClicked()));
        m_commitButton = 0;
    }

    setCommitPage(true);
    if (packageManagerCore()->isUpdater() || packageManagerCore()->isPackageManager()) {
#ifdef Q_OS_MAC
        gui()->setOption(QWizard::NoCancelButton, false);
#endif
        if (QAbstractButton *cancel = gui()->button(QWizard::CancelButton)) {
            m_commitButton = cancel;
            cancel->setEnabled(true);
            cancel->setVisible(true);
        }
        setButtonText(QWizard::CommitButton, tr("Restart"));
        setButtonText(QWizard::CancelButton, gui()->defaultButtonText(QWizard::FinishButton));
    } else {
        if (packageManagerCore()->isInstaller())
            m_commitButton = wizard()->button(QWizard::FinishButton);

        gui()->setOption(QWizard::NoCancelButton, true);
        if (QAbstractButton *cancel = gui()->button(QWizard::CancelButton))
            cancel->setVisible(false);
    }

    gui()->updateButtonLayout();

    if (m_commitButton) {
        disconnect(m_commitButton, SIGNAL(clicked()), this, SLOT(handleFinishClicked()));
        connect(m_commitButton, SIGNAL(clicked()), this, SLOT(handleFinishClicked()));
    }

    if (packageManagerCore()->status() == PackageManagerCore::Success) {
        const QString finishedText = packageManagerCore()->value(QLatin1String("FinishedText"));
        if (!finishedText.isEmpty())
            m_msgLabel->setText(finishedText);

        if (!packageManagerCore()->value(scRunProgram).isEmpty()) {
            m_runItCheckBox->show();
            m_runItCheckBox->setText(packageManagerCore()->value(scRunProgramDescription, tr("Run %1 now."))
                .arg(productName()));
            return; // job done
        }
    } else {
        // TODO: how to handle this using the config.xml
        setTitle(tr("The %1 Wizard failed.").arg(productName()));
    }

    m_runItCheckBox->hide();
    m_runItCheckBox->setChecked(false);
}

void FinishedPage::leaving()
{
#ifdef Q_OS_MAC
    gui()->setOption(QWizard::NoCancelButton, true);
#endif

    if (QAbstractButton *cancel = gui()->button(QWizard::CancelButton))
        cancel->setVisible(false);
    gui()->updateButtonLayout();

    setButtonText(QWizard::CommitButton, gui()->defaultButtonText(QWizard::CommitButton));
    setButtonText(QWizard::CancelButton, gui()->defaultButtonText(QWizard::CancelButton));
}

void FinishedPage::handleFinishClicked()
{
    const QString program = packageManagerCore()->replaceVariables(packageManagerCore()->value(scRunProgram));
    const QStringList args = packageManagerCore()->replaceVariables(
                packageManagerCore()->value(scRunProgramArguments)).split(QLatin1Char(' '));
    if (!m_runItCheckBox->isChecked() || program.isEmpty())
        return;

    qDebug() << "starting" << program << args;
    QProcess::startDetached(program, args);
}


// -- RestartPage

RestartPage::RestartPage(PackageManagerCore *core)
    : PackageManagerPage(core)
{
    setObjectName(QLatin1String("RestartPage"));
    setTitle(tr("Completing the %1 Setup Wizard").arg(productName()));

    setFinalPage(false);
    setCommitPage(false);
}

int RestartPage::nextId() const
{
    return PackageManagerCore::Introduction;
}

void RestartPage::entering()
{
    if (!packageManagerCore()->needsRestart()) {
        if (QAbstractButton *finish = wizard()->button(QWizard::FinishButton))
            finish->setVisible(false);
        QMetaObject::invokeMethod(this, "restart", Qt::QueuedConnection);
    } else {
        gui()->accept();
    }
}

void RestartPage::leaving()
{
}

#include "packagemanagergui.moc"
#include "moc_packagemanagergui.cpp"