/*
 * Copyright (c) 2010-2016 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Swift/QtUI/QtTabbable.h>

#include <QApplication>
#include <QKeyEvent>
#include <QShortcut>

#include <Swiften/Base/Platform.h>
#include <Swiften/Base/foreach.h>

#include <Swift/QtUI/QtChatTabs.h>
#include <Swift/QtUI/QtUtilities.h>

namespace Swift {

QtTabbable::QtTabbable() : QWidget() {

}

QtTabbable::~QtTabbable() {
    emit windowClosing();
}

bool QtTabbable::isWidgetSelected() {
    /*isActiveWindow() shouldn't be necessary, but I don't trust it as far as I can throw it*/
    if (!isActiveWindow()) {
        return false;
    }
    QtChatTabs* parent = qobject_cast<QtChatTabs*>(window());
    return parent ? parent->getCurrentTab() == this : isAncestorOf(QApplication::focusWidget());
}

bool QtTabbable::event(QEvent* event) {
    QKeyEvent* keyEvent = dynamic_cast<QKeyEvent*>(event);
    if (keyEvent) {
        // According to Qt's focus documentation, one can only override CTRL+TAB via reimplementing QWidget::event().
        if (keyEvent->modifiers().testFlag(QtUtilities::ctrlHardwareKeyModifier) && keyEvent->key() == Qt::Key_Tab) {
            // Only handle KeyRelease event as Linux also generate KeyPress event in case of CTRL+TAB being pressed
            // in the roster of a MUC.
            if (keyEvent->type() == QEvent::KeyRelease) {
                emit requestNextTab();
            }
            return true;
        }
#ifdef SWIFTEN_PLATFORM_LINUX
        else if (keyEvent->modifiers().testFlag(QtUtilities::ctrlHardwareKeyModifier) && keyEvent->key() == Qt::Key_Backtab && keyEvent->type() != QEvent::KeyRelease) {
#else
        else if (keyEvent->modifiers().testFlag(QtUtilities::ctrlHardwareKeyModifier) && keyEvent->key() == Qt::Key_Backtab) {
#endif
#ifdef SWIFTEN_PLATFORM_WINDOWS
            // Windows emits both the KeyPress and KeyRelease events.
            if (keyEvent->type() == QEvent::KeyPress) {
#else
            if (keyEvent->type() != QEvent::ShortcutOverride) {
#endif
                emit requestPreviousTab();
            }
            return true;
        }
    }
    return QWidget::event(event);
}

}