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/*
 * Copyright (c) 2015-2016 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Swift/QtUI/QtChatTabsShortcutOnlySubstitute.h>

#include <cassert>

#include <QApplication>
#include <QShortcut>

#include <Swiften/Base/Log.h>

#include <Swift/QtUI/QtTabbable.h>

namespace Swift {

QtChatTabsShortcutOnlySubstitute::QtChatTabsShortcutOnlySubstitute() : QWidget() {

}

QtChatTabsShortcutOnlySubstitute::~QtChatTabsShortcutOnlySubstitute() {

}

void QtChatTabsShortcutOnlySubstitute::addTab(QtTabbable* tab) {
    connect(tab, SIGNAL(requestNextTab()), this, SLOT(handleRequestedNextTab()), Qt::UniqueConnection);
    connect(tab, SIGNAL(requestActiveTab()), this, SLOT(handleRequestedActiveTab()), Qt::UniqueConnection);
    connect(tab, SIGNAL(requestPreviousTab()), this, SLOT(handleRequestedPreviousTab()), Qt::UniqueConnection);

    connect(new QShortcut(QKeySequence(tr("CTRL+W", "Close chat tab.")), tab), SIGNAL(activated()), this, SLOT(handleCloseTabShortcut()));
    connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_PageUp), tab), SIGNAL(activated()), tab, SIGNAL(requestPreviousTab()));
    connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_PageDown), tab), SIGNAL(activated()), tab, SIGNAL(requestNextTab()));
    connect(new QShortcut(QKeySequence(Qt::ALT + Qt::Key_A), tab), SIGNAL(activated()), tab, SIGNAL(requestActiveTab()));
}

void QtChatTabsShortcutOnlySubstitute::handleCloseTabShortcut() {
    QtTabbable* senderTab = dynamic_cast<QtTabbable*>(sender()->parent());
    SWIFT_LOG_ASSERT(senderTab, debug) << "No window to close." << std::endl;
    if (senderTab) {
        senderTab->close();
    }
}

void QtChatTabsShortcutOnlySubstitute::handleRequestedNextTab() {
    QtTabbable* senderTab = dynamic_cast<QtTabbable*>(sender());

    QList<QtTabbable*> tabs = tabbableWindows();

    int currentIndex = tabs.indexOf(senderTab);
    assert(currentIndex >= 0);

    QtTabbable* nextTab = tabs.at((currentIndex + 1) % tabs.size());
    nextTab->activateWindow();
}

void QtChatTabsShortcutOnlySubstitute::handleRequestedActiveTab() {
    QtTabbable* senderTab = dynamic_cast<QtTabbable*>(sender());

    QtTabbable::AlertType types[] = {QtTabbable::WaitingActivity, QtTabbable::ImpendingActivity};

    QList<QtTabbable*> tabs = tabbableWindows();

    for (auto& type : types) {
        int startIndex = tabs.indexOf(senderTab);
        int currentIndex = startIndex;

        do {
            currentIndex = (currentIndex + 1) % tabs.size();
            QtTabbable* currentTab = tabs.at(currentIndex);
            if (currentTab->getWidgetAlertState() == type) {
                currentTab->activateWindow();
                return;
            }
        } while (startIndex != currentIndex);
    }
}

void QtChatTabsShortcutOnlySubstitute::handleRequestedPreviousTab() {
    QtTabbable* senderTab = dynamic_cast<QtTabbable*>(sender());

    QList<QtTabbable*> tabs = tabbableWindows();

    int currentIndex = tabs.indexOf(senderTab);
    assert(currentIndex >= 0);

    QtTabbable* previousTab = tabs.at((currentIndex + tabs.size() - 1) % tabs.size());
    previousTab->activateWindow();
}

QList<QtTabbable*> QtChatTabsShortcutOnlySubstitute::tabbableWindows() const {
    QList<QWidget*> windows = qApp->topLevelWidgets();

    QList<QtTabbable*> tabbables;
    for (auto topLevelWidget : windows) {
        QtTabbable* tabbable = dynamic_cast<QtTabbable*>(topLevelWidget);
        if (tabbable) {
            tabbables << tabbable;
        }
    }

    return tabbables;
}

}