/*
 * This file is part of the KDE Libraries
 * Copyright (C) 1999-2000 Espen Sand (espen@kde.org)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

// I (espen) prefer that header files are included alphabetically

#include "khelpmenu.h"

#include <QtCore/QTimer>
#include <QtGui/QLabel>
#include <QtGui/QWidget>
#include <QtGui/QWhatsThis>

#include <kaboutapplicationdialog.h>
#include <kaboutdata.h>
#include <kaboutkdedialog_p.h>
#include <kaction.h>
#include <kactioncollection.h>
#include <kapplication.h>
#include <kdialog.h>
#include <kguiitem.h>
#include <khbox.h>
#include <kiconloader.h>
#include <klocale.h>
#include <kmenu.h>
#include <kstandardshortcut.h>
#include <kstandardaction.h>
#include <kstandardguiitem.h>
#include <kswitchlanguagedialog_p.h>
#include <ktoolinvocation.h>
#include <kstandarddirs.h>

#include <config.h>
#ifdef Q_WS_X11
#include <QtGui/qx11embed_x11.h>
#endif

#include <kglobalsettings.h>

using namespace KDEPrivate;

class KHelpMenuPrivate
{
public:
    KHelpMenuPrivate()
        : mSwitchApplicationLanguage(0),
        mActionsCreated(false),
        mSwitchApplicationLanguageAction(0)
    {
        mMenu = 0;
        mAboutApp = 0;
        mAboutKDE = 0;
        mWhatsThisAction = 0;
        mReportBugAction = 0;
        mAboutAppAction = 0;
        mAboutKDEAction = 0;
    }
    ~KHelpMenuPrivate()
    {
        delete mMenu;
        delete mAboutApp;
        delete mAboutKDE;
        delete mSwitchApplicationLanguage;
    }

    void createActions(KHelpMenu* q);

    KMenu *mMenu;
    KDialog *mAboutApp;
    KAboutKdeDialog *mAboutKDE;
    KSwitchLanguageDialog *mSwitchApplicationLanguage;

    // TODO evaluate if we use static_cast<QWidget*>(parent()) instead of mParent to win that bit of memory
    QWidget *mParent;
    QString mAboutAppText;

    bool mShowWhatsThis;
    bool mActionsCreated;

    KAction *mWhatsThisAction;
    QAction *mReportBugAction, *mSwitchApplicationLanguageAction, *mAboutAppAction, *mAboutKDEAction;

    const KAboutData *mAboutData;
};

KHelpMenu::KHelpMenu(QWidget *parent, const QString &aboutAppText,
                     bool showWhatsThis)
    : QObject(parent),
    d(new KHelpMenuPrivate)
{
    d->mAboutAppText = aboutAppText;
    d->mShowWhatsThis = showWhatsThis;
    d->mParent = parent;
    d->mAboutData = 0;
}

KHelpMenu::KHelpMenu(QWidget *parent, const KAboutData *aboutData,
                     bool showWhatsThis, KActionCollection *actions)
    : QObject(parent),
    d(new KHelpMenuPrivate)
{
    d->mShowWhatsThis = showWhatsThis;
    d->mParent = parent;
    d->mAboutData = aboutData;

    if (actions) {
        d->createActions(this);
        if (d->mWhatsThisAction) {
            actions->addAction(d->mWhatsThisAction->objectName(), d->mWhatsThisAction);
        }
        if (d->mReportBugAction) {
            actions->addAction(d->mReportBugAction->objectName(), d->mReportBugAction);
        }
        if (d->mSwitchApplicationLanguageAction) {
            actions->addAction(d->mSwitchApplicationLanguageAction->objectName(), d->mSwitchApplicationLanguageAction);
        }
        if (d->mAboutAppAction) {
            actions->addAction(d->mAboutAppAction->objectName(), d->mAboutAppAction);
        }
        if (d->mAboutKDEAction) {
            actions->addAction(d->mAboutKDEAction->objectName(), d->mAboutKDEAction);
        }
    }
}

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

void KHelpMenuPrivate::createActions(KHelpMenu* q)
{
    if (mActionsCreated) {
        return;
    }
    mActionsCreated = true;

    if (mShowWhatsThis) {
        mWhatsThisAction = KStandardAction::whatsThis(q, SLOT(contextHelpActivated()), q);
    }

    const KAboutData *aboutData = mAboutData ? mAboutData : KGlobal::mainComponent().aboutData();
    if (aboutData && !aboutData->bugAddress().isEmpty()) {
        mReportBugAction = KStandardAction::reportBug(q, SLOT(reportBug()), q);
    }

    if ((KGlobal::dirs()->findAllResources("locale", QString::fromLatin1("l10n/*/entry.desktop"))).count() > 0) {
        mSwitchApplicationLanguageAction = KStandardAction::create(KStandardAction::SwitchApplicationLanguage, q, SLOT(switchApplicationLanguage()), q);
    }

    mAboutAppAction = KStandardAction::aboutApp(q, SLOT(aboutApplication()), q);
    mAboutKDEAction = KStandardAction::aboutKDE(q, SLOT(aboutKDE()), q);
}

// Used in the non-xml-gui case, like kfind or ksnapshot's help button.
KMenu* KHelpMenu::menu()
{
    if (!d->mMenu) {
        d->mMenu = new KMenu();
        connect(d->mMenu, SIGNAL(destroyed()), this, SLOT(menuDestroyed()));

        d->mMenu->setTitle(i18n("&Help"));

        d->createActions(this);

        bool need_separator = false;
        if (d->mWhatsThisAction) {
            d->mMenu->addAction(d->mWhatsThisAction);
            need_separator = true;
        }

        if (d->mReportBugAction) {
        if (need_separator) {
            d->mMenu->addSeparator();
        }
        d->mMenu->addAction(d->mReportBugAction);
        need_separator = true;
        }

        if (d->mSwitchApplicationLanguageAction) {
            if (need_separator) {
                d->mMenu->addSeparator();
            }
            d->mMenu->addAction(d->mSwitchApplicationLanguageAction);
            need_separator = true;
        }

        if (need_separator) {
            d->mMenu->addSeparator();
        }

        if (d->mAboutAppAction) {
            d->mMenu->addAction(d->mAboutAppAction);
        }

        if (d->mAboutKDEAction) {
            d->mMenu->addAction(d->mAboutKDEAction);
        }
    }

    return d->mMenu;
}

QAction *KHelpMenu::action(MenuId id) const
{
    switch (id) {
        case menuWhatsThis: {
            return d->mWhatsThisAction;
        }
        case menuReportBug: {
            return d->mReportBugAction;
        }
        case menuSwitchLanguage: {
            return d->mSwitchApplicationLanguageAction;
        }
        case menuAboutApp: {
            return d->mAboutAppAction;
        }
        case menuAboutKDE: {
            return d->mAboutKDEAction;
        }
    }
    return 0;
}

void KHelpMenu::appHelpActivated()
{
    KToolInvocation::invokeHelp();
}

void KHelpMenu::aboutApplication()
{
    if (receivers(SIGNAL(showAboutApplication())) > 0) {
        emit showAboutApplication();
    } else if (d->mAboutData) {
        if (!d->mAboutApp) {
            d->mAboutApp = new KAboutApplicationDialog(d->mAboutData, d->mParent);
            connect(d->mAboutApp, SIGNAL(finished()), this, SLOT(dialogFinished()));
        }
        d->mAboutApp->show();
    } else {
        if (!d->mAboutApp) {
            d->mAboutApp = new KDialog(d->mParent, Qt::Dialog);
            d->mAboutApp->setCaption(i18n("About %1", KGlobal::caption()));
            d->mAboutApp->setButtons(KDialog::Yes);
            d->mAboutApp->setObjectName("about");
            d->mAboutApp->setButtonText( KDialog::Yes, KStandardGuiItem::ok().text());
            d->mAboutApp->setDefaultButton( KDialog::Yes );
            d->mAboutApp->setEscapeButton( KDialog::Yes );
            connect(d->mAboutApp, SIGNAL(finished()), this, SLOT(dialogFinished()));

            KHBox *hbox = new KHBox(d->mAboutApp);
            d->mAboutApp->setMainWidget(hbox);
            hbox->setSpacing(KDialog::spacingHint() * 3);
            hbox->setMargin(KDialog::marginHint() * 1);

            QLabel *label1 = new QLabel(hbox);

            int size = IconSize(KIconLoader::Dialog);
            label1->setPixmap(qApp->windowIcon().pixmap(size,size));
            QLabel *label2 = new QLabel(hbox);
            label2->setText(d->mAboutAppText);
        }
        d->mAboutApp->show();
    }
}

void KHelpMenu::aboutKDE()
{
    if (!d->mAboutKDE) {
        d->mAboutKDE = new KAboutKdeDialog(d->mParent);
        connect(d->mAboutKDE, SIGNAL(finished()), this, SLOT(dialogFinished()));
    }
    d->mAboutKDE->show();
}


void KHelpMenu::reportBug()
{
    KToolInvocation::invokeBrowser(KDE_BUG_REPORT_URL);
}


void KHelpMenu::switchApplicationLanguage()
{
    if (!d->mSwitchApplicationLanguage) {
        d->mSwitchApplicationLanguage = new KSwitchLanguageDialog(d->mParent);
        connect(d->mSwitchApplicationLanguage, SIGNAL(finished()), this, SLOT(dialogFinished()));
    }
    d->mSwitchApplicationLanguage->show();
}


void KHelpMenu::dialogFinished()
{
    QTimer::singleShot(0, this, SLOT(timerExpired()));
}

void KHelpMenu::timerExpired()
{
    if (d->mAboutKDE && !d->mAboutKDE->isVisible()) {
        delete d->mAboutKDE;
        d->mAboutKDE = 0;
    }

    if (d->mSwitchApplicationLanguage && !d->mSwitchApplicationLanguage->isVisible()) {
        delete d->mSwitchApplicationLanguage;
        d->mSwitchApplicationLanguage = 0;
    }

    if (d->mAboutApp && !d->mAboutApp->isVisible()) {
        delete d->mAboutApp;
        d->mAboutApp = 0;
    }
}

void KHelpMenu::menuDestroyed()
{
    d->mMenu = 0;
}

void KHelpMenu::contextHelpActivated()
{
    QWhatsThis::enterWhatsThisMode();
    QWidget* w = QApplication::widgetAt( QCursor::pos() );
#ifdef Q_WS_X11
    while ( w && !w->isTopLevel() && !qobject_cast<QX11EmbedWidget*>(w)  )
        w = w->parentWidget();
#warning how to enter whats this mode for a QX11EmbedWidget?
//      if ( w && qobject_cast<QX11EmbedWidget*>(w) )
//          (( QX11EmbedWidget*) w )->enterWhatsThisMode();
#endif
}

#include "moc_khelpmenu.cpp"