/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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** a written agreement between you and The Qt Company. For licensing terms
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** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <qpa/qplatformtheme.h>

#include "qcocoahelpers.h"


#include <QtCore>
#include <QtGui>
#include <qpa/qplatformscreen.h>
#include <private/qguiapplication_p.h>
#include <private/qwindow_p.h>
#include <QtGui/private/qcoregraphics_p.h>

#ifndef QT_NO_WIDGETS
#include <QtWidgets/QWidget>
#endif

#include <algorithm>

#include <Carbon/Carbon.h>

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(lcQpaCocoaWindow, "qt.qpa.cocoa.window");

//
// Conversion Functions
//

QStringList qt_mac_NSArrayToQStringList(void *nsarray)
{
    QStringList result;
    NSArray *array = static_cast<NSArray *>(nsarray);
    for (NSUInteger i=0; i<[array count]; ++i)
        result << QCFString::toQString([array objectAtIndex:i]);
    return result;
}

void *qt_mac_QStringListToNSMutableArrayVoid(const QStringList &list)
{
    NSMutableArray *result = [NSMutableArray arrayWithCapacity:list.size()];
    for (int i=0; i<list.size(); ++i){
        [result addObject:list[i].toNSString()];
    }
    return result;
}

struct dndenum_mapper
{
    NSDragOperation mac_code;
    Qt::DropAction qt_code;
    bool Qt2Mac;
};

static dndenum_mapper dnd_enums[] = {
    { NSDragOperationLink,  Qt::LinkAction, true },
    { NSDragOperationMove,  Qt::MoveAction, true },
    { NSDragOperationCopy,  Qt::CopyAction, true },
    { NSDragOperationGeneric,  Qt::CopyAction, false },
    { NSDragOperationEvery, Qt::ActionMask, false },
    { NSDragOperationNone, Qt::IgnoreAction, false }
};

NSDragOperation qt_mac_mapDropAction(Qt::DropAction action)
{
    for (int i=0; dnd_enums[i].qt_code; i++) {
        if (dnd_enums[i].Qt2Mac && (action & dnd_enums[i].qt_code)) {
            return dnd_enums[i].mac_code;
        }
    }
    return NSDragOperationNone;
}

NSDragOperation qt_mac_mapDropActions(Qt::DropActions actions)
{
    NSDragOperation nsActions = NSDragOperationNone;
    for (int i=0; dnd_enums[i].qt_code; i++) {
        if (dnd_enums[i].Qt2Mac && (actions & dnd_enums[i].qt_code))
            nsActions |= dnd_enums[i].mac_code;
    }
    return nsActions;
}

Qt::DropAction qt_mac_mapNSDragOperation(NSDragOperation nsActions)
{
    Qt::DropAction action = Qt::IgnoreAction;
    for (int i=0; dnd_enums[i].mac_code; i++) {
        if (nsActions & dnd_enums[i].mac_code)
            return dnd_enums[i].qt_code;
    }
    return action;
}

Qt::DropActions qt_mac_mapNSDragOperations(NSDragOperation nsActions)
{
    Qt::DropActions actions = Qt::IgnoreAction;

    for (int i=0; dnd_enums[i].mac_code; i++) {
        if (dnd_enums[i].mac_code == NSDragOperationEvery)
            continue;

        if (nsActions & dnd_enums[i].mac_code)
            actions |= dnd_enums[i].qt_code;
    }
    return actions;
}



//
// Misc
//

// Sets the activation policy for this process to NSApplicationActivationPolicyRegular,
// unless either LSUIElement or LSBackgroundOnly is set in the Info.plist.
void qt_mac_transformProccessToForegroundApplication()
{
    bool forceTransform = true;
    CFTypeRef value = CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(),
                                                           CFSTR("LSUIElement"));
    if (value) {
        CFTypeID valueType = CFGetTypeID(value);
        // Officially it's supposed to be a string, a boolean makes sense, so we'll check.
        // A number less so, but OK.
        if (valueType == CFStringGetTypeID())
            forceTransform = !(QCFString::toQString(static_cast<CFStringRef>(value)).toInt());
        else if (valueType == CFBooleanGetTypeID())
            forceTransform = !CFBooleanGetValue(static_cast<CFBooleanRef>(value));
        else if (valueType == CFNumberGetTypeID()) {
            int valueAsInt;
            CFNumberGetValue(static_cast<CFNumberRef>(value), kCFNumberIntType, &valueAsInt);
            forceTransform = !valueAsInt;
        }
    }

    if (forceTransform) {
        value = CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(),
                                                     CFSTR("LSBackgroundOnly"));
        if (value) {
            CFTypeID valueType = CFGetTypeID(value);
            if (valueType == CFBooleanGetTypeID())
                forceTransform = !CFBooleanGetValue(static_cast<CFBooleanRef>(value));
            else if (valueType == CFStringGetTypeID())
                forceTransform = !(QCFString::toQString(static_cast<CFStringRef>(value)).toInt());
            else if (valueType == CFNumberGetTypeID()) {
                int valueAsInt;
                CFNumberGetValue(static_cast<CFNumberRef>(value), kCFNumberIntType, &valueAsInt);
                forceTransform = !valueAsInt;
            }
        }
    }

    if (forceTransform) {
        [[NSApplication sharedApplication] setActivationPolicy:NSApplicationActivationPolicyRegular];
    }
}

QString qt_mac_applicationName()
{
    QString appName;
    CFTypeRef string = CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(), CFSTR("CFBundleName"));
    if (string)
        appName = QCFString::toQString(static_cast<CFStringRef>(string));

    if (appName.isEmpty()) {
        QString arg0 = QGuiApplicationPrivate::instance()->appName();
        if (arg0.contains("/")) {
            QStringList parts = arg0.split(QLatin1Char('/'));
            appName = parts.at(parts.count() - 1);
        } else {
            appName = arg0;
        }
    }
    return appName;
}

int qt_mac_mainScreenHeight()
{
    QMacAutoReleasePool pool;
    NSArray *screens = [NSScreen screens];
    if ([screens count] > 0) {
        // The first screen in the screens array is documented
        // to have the (0,0) origin.
        NSRect screenFrame = [[screens objectAtIndex: 0] frame];
        return screenFrame.size.height;
    }
    return 0;
}

int qt_mac_flipYCoordinate(int y)
{
    return qt_mac_mainScreenHeight() - y;
}

qreal qt_mac_flipYCoordinate(qreal y)
{
    return qt_mac_mainScreenHeight() - y;
}

QPointF qt_mac_flipPoint(const NSPoint &p)
{
    return QPointF(p.x, qt_mac_flipYCoordinate(p.y));
}

NSPoint qt_mac_flipPoint(const QPoint &p)
{
    return NSMakePoint(p.x(), qt_mac_flipYCoordinate(p.y()));
}

NSPoint qt_mac_flipPoint(const QPointF &p)
{
    return NSMakePoint(p.x(), qt_mac_flipYCoordinate(p.y()));
}

NSRect qt_mac_flipRect(const QRect &rect)
{
    int flippedY = qt_mac_flipYCoordinate(rect.y() + rect.height());
    return NSMakeRect(rect.x(), flippedY, rect.width(), rect.height());
}

Qt::MouseButton cocoaButton2QtButton(NSInteger buttonNum)
{
    if (buttonNum == 0)
        return Qt::LeftButton;
    if (buttonNum == 1)
        return Qt::RightButton;
    if (buttonNum == 2)
        return Qt::MiddleButton;
    if (buttonNum >= 3 && buttonNum <= 31) { // handle XButton1 and higher via logical shift
        return Qt::MouseButton(uint(Qt::MiddleButton) << (buttonNum - 3));
    }
    // else error: buttonNum too high, or negative
    return Qt::NoButton;
}

QString qt_mac_removeAmpersandEscapes(QString s)
{
    return QPlatformTheme::removeMnemonics(s).trimmed();
}

QT_END_NAMESPACE