/****************************************************************************
**
** Copyright (C) 2015-2016 Oleg Shparber
** Copyright (C) 2013-2014 Jerzy Kozera
** Contact: https://go.zealdocs.org/l/contact
**
** This file is part of Zeal.
**
** Zeal is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with Zeal. If not, see <https://www.gnu.org/licenses/>.
**
****************************************************************************/
/****************************************************************************
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** See the Qxt AUTHORS file for a list of authors and copyright holders.
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*****************************************************************************/

#include "qxtglobalshortcut.h"
#include "qxtglobalshortcut_p.h"

#include <QAbstractEventDispatcher>
#include <QGuiApplication>

#ifndef Q_OS_MACOS
int QxtGlobalShortcutPrivate::ref = 0;
#endif // Q_OS_MACOS

QHash<QPair<quint32, quint32>, QxtGlobalShortcut *> QxtGlobalShortcutPrivate::shortcuts;

QxtGlobalShortcutPrivate::QxtGlobalShortcutPrivate(QxtGlobalShortcut *qq)
    : q_ptr(qq)
{
#ifndef Q_OS_MACOS
    if (ref == 0)
        QAbstractEventDispatcher::instance()->installNativeEventFilter(this);
    ++ref;
#endif // Q_OS_MACOS
}

QxtGlobalShortcutPrivate::~QxtGlobalShortcutPrivate()
{
#ifndef Q_OS_MACOS
    --ref;
    if (ref == 0) {
        QAbstractEventDispatcher *ed = QAbstractEventDispatcher::instance();
        if (ed != nullptr) {
            ed->removeNativeEventFilter(this);
        }
    }
#endif // Q_OS_MACOS
}

bool QxtGlobalShortcutPrivate::setShortcut(const QKeySequence &shortcut)
{
    Q_Q(QxtGlobalShortcut);
    Qt::KeyboardModifiers allMods = Qt::ShiftModifier | Qt::ControlModifier | Qt::AltModifier | Qt::MetaModifier;
    key = shortcut.isEmpty() ? Qt::Key(0) : Qt::Key((shortcut[0] ^ allMods) & shortcut[0]);
    mods = shortcut.isEmpty() ? Qt::KeyboardModifiers(Qt::NoModifier) : Qt::KeyboardModifiers(shortcut[0] & allMods);
    const quint32 nativeKey = nativeKeycode(key);
    const quint32 nativeMods = nativeModifiers(mods);
    const bool res = registerShortcut(nativeKey, nativeMods);
    if (res)
        shortcuts.insert({nativeKey, nativeMods}, q);
    else
        qWarning("QxtGlobalShortcut failed to register: %s", qPrintable(QKeySequence(key + mods).toString()));

    return res;
}

bool QxtGlobalShortcutPrivate::unsetShortcut()
{
    Q_Q(QxtGlobalShortcut);

    bool res = false;
    const quint32 nativeKey = nativeKeycode(key);
    const quint32 nativeMods = nativeModifiers(mods);
    if (shortcuts.value({nativeKey, nativeMods}) == q)
        res = unregisterShortcut(nativeKey, nativeMods);

    if (res)
        shortcuts.remove({nativeKey, nativeMods});
    else
        qWarning("QxtGlobalShortcut failed to unregister: %s", qPrintable(QKeySequence(key + mods).toString()));

    key = Qt::Key(0);
    mods = Qt::KeyboardModifiers(Qt::NoModifier);
    return res;
}

bool QxtGlobalShortcutPrivate::activateShortcut(quint32 nativeKey, quint32 nativeMods)
{
    QxtGlobalShortcut *shortcut = shortcuts.value({nativeKey, nativeMods});
    if (!shortcut || !shortcut->isEnabled())
        return false;

    emit shortcut->activated();
    return true;
}

/*!
    \class QxtGlobalShortcut
    \inmodule QxtWidgets
    \brief The QxtGlobalShortcut class provides a global shortcut aka "hotkey".

    A global shortcut triggers even if the application is not active. This
    makes it easy to implement applications that react to certain shortcuts
    still if some other application is active or if the application is for
    example minimized to the system tray.

    Example usage:
    \code
    QxtGlobalShortcut *shortcut = new QxtGlobalShortcut(window);
    connect(shortcut, SIGNAL(activated()), window, SLOT(toggleVisibility()));
    shortcut->setShortcut(QKeySequence("Ctrl+Shift+F12"));
    \endcode

    \bold {Note:} Since Qxt 0.6 QxtGlobalShortcut no more requires QxtApplication.
 */

/*!
    \fn QxtGlobalShortcut::activated()

    This signal is emitted when the user types the shortcut's key sequence.

    \sa shortcut
 */

/*!
    Constructs a new QxtGlobalShortcut with \a parent.
 */
QxtGlobalShortcut::QxtGlobalShortcut(QObject *parent)
    : QObject(parent)
    , d_ptr(new QxtGlobalShortcutPrivate(this))
{
}

/*!
    Constructs a new QxtGlobalShortcut with \a shortcut and \a parent.
 */
QxtGlobalShortcut::QxtGlobalShortcut(const QKeySequence &shortcut, QObject *parent)
    : QObject(parent)
    , d_ptr(new QxtGlobalShortcutPrivate(this))
{
    setShortcut(shortcut);
}

/*!
    Destructs the QxtGlobalShortcut.
 */
QxtGlobalShortcut::~QxtGlobalShortcut()
{
    Q_D(QxtGlobalShortcut);
    if (d->key != 0)
        d->unsetShortcut();
    delete d;
}

/*!
    \property QxtGlobalShortcut::shortcut
    \brief the shortcut key sequence

    \bold {Note:} Notice that corresponding key press and release events are not
    delivered for registered global shortcuts even if they are disabled.
    Also, comma separated key sequences are not supported.
    Only the first part is used:

    \code
    qxtShortcut->setShortcut(QKeySequence("Ctrl+Alt+A,Ctrl+Alt+B"));
    Q_ASSERT(qxtShortcut->shortcut() == QKeySequence("Ctrl+Alt+A"));
    \endcode
 */
QKeySequence QxtGlobalShortcut::shortcut() const
{
    Q_D(const QxtGlobalShortcut);
    return QKeySequence(d->key | d->mods);
}

bool QxtGlobalShortcut::setShortcut(const QKeySequence &shortcut)
{
    Q_D(QxtGlobalShortcut);
    if (d->key != 0 && !d->unsetShortcut())
        return false;
    if (shortcut.isEmpty())
        return true;
    return d->setShortcut(shortcut);
}

/*!
    \property QxtGlobalShortcut::enabled
    \brief whether the shortcut is enabled

    A disabled shortcut does not get activated.

    The default value is \c true.

    \sa setDisabled()
 */
bool QxtGlobalShortcut::isEnabled() const
{
    Q_D(const QxtGlobalShortcut);
    return d->enabled;
}

/*!
 * \brief QxtGlobalShortcut::isSupported checks if the current platform is supported.
 */
bool QxtGlobalShortcut::isSupported()
{
    return QGuiApplication::platformName() == QLatin1String("windows")
            || QGuiApplication::platformName() == QLatin1String("xcb")
            || QGuiApplication::platformName() == QLatin1String("cocoa");
}

void QxtGlobalShortcut::setEnabled(bool enabled)
{
    Q_D(QxtGlobalShortcut);
    d->enabled = enabled;
}
