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#include <qcocoaapplication.h>

#include <qcocoaintrospection.h>
#include <qcocoaapplicationdelegate.h>
#include <qcocoahelpers.h>
#include <qguiapplication.h>
#include <qdebug.h>

QT_USE_NAMESPACE

@implementation NSApplication (QT_MANGLE_NAMESPACE(QApplicationIntegration))

- (void)QT_MANGLE_NAMESPACE(qt_setDockMenu):(NSMenu *)newMenu
{
    [[QT_MANGLE_NAMESPACE(QCocoaApplicationDelegate) sharedDelegate] setDockMenu:newMenu];
}

- (QT_MANGLE_NAMESPACE(QCocoaMenuLoader) *)QT_MANGLE_NAMESPACE(qt_qcocoamenuLoader)
{
    return [[QT_MANGLE_NAMESPACE(QCocoaApplicationDelegate) sharedDelegate] menuLoader];
}

- (int)QT_MANGLE_NAMESPACE(qt_validModesForFontPanel):(NSFontPanel *)fontPanel
{
    Q_UNUSED(fontPanel);
    // only display those things that QFont can handle
    return NSFontPanelFaceModeMask
            | NSFontPanelSizeModeMask
            | NSFontPanelCollectionModeMask
            | NSFontPanelUnderlineEffectModeMask
            | NSFontPanelStrikethroughEffectModeMask;
}

- (void)QT_MANGLE_NAMESPACE(qt_sendPostedMessage):(NSEvent *)event
{
    // WARNING: data1 and data2 is truncated to from 64-bit to 32-bit on OS 10.5!
    // That is why we need to split the address in two parts:
    quint64 lower = [event data1];
    quint64 upper = [event data2];
    QCocoaPostMessageArgs *args = reinterpret_cast<QCocoaPostMessageArgs *>(lower | (upper << 32));
    // Special case for convenience: if the argument is an NSNumber, we unbox it directly.
    // Use NSValue instead if this behaviour is unwanted.
    id a1 = ([args->arg1 isKindOfClass:[NSNumber class]]) ? (id)[args->arg1 longValue] : args->arg1;
    id a2 = ([args->arg2 isKindOfClass:[NSNumber class]]) ? (id)[args->arg2 longValue] : args->arg2;
    switch (args->argCount) {
    case 0:
        [args->target performSelector:args->selector];
        break;
    case 1:
        [args->target performSelector:args->selector withObject:a1];
        break;
    case 3:
        [args->target performSelector:args->selector withObject:a1 withObject:a2];
        break;
    }

    delete args;
}

static const QByteArray q_macLocalEventType = QByteArrayLiteral("mac_generic_NSEvent");

- (BOOL)QT_MANGLE_NAMESPACE(qt_filterEvent):(NSEvent *)event
{
    if (qApp && qApp->eventDispatcher()->
            filterNativeEvent(q_macLocalEventType, static_cast<void*>(event), 0))
        return true;

    if ([event type] == NSApplicationDefined) {
        switch (static_cast<short>([event subtype])) {
            case QtCocoaEventSubTypePostMessage:
                [NSApp QT_MANGLE_NAMESPACE(qt_sendPostedMessage):event];
                return true;
            default:
                break;
        }
    }

    return false;
}

@end

@implementation QT_MANGLE_NAMESPACE(QNSApplication)

- (void)QT_MANGLE_NAMESPACE(qt_sendEvent_original):(NSEvent *)event
{
    Q_UNUSED(event);
    // This method will only be used as a signature
    // template for the method we add into NSApplication
    // containing the original [NSApplication sendEvent:] implementation
}

- (void)QT_MANGLE_NAMESPACE(qt_sendEvent_replacement):(NSEvent *)event
{
    // This method (or its implementation to be precise) will
    // be called instead of sendEvent if redirection occurs.
    // 'self' will then be an instance of NSApplication
    // (and not QNSApplication)
    if (![NSApp QT_MANGLE_NAMESPACE(qt_filterEvent):event])
        [self QT_MANGLE_NAMESPACE(qt_sendEvent_original):event];
}

- (void)sendEvent:(NSEvent *)event
{
    // This method will be called if
    // no redirection occurs
    if (![NSApp QT_MANGLE_NAMESPACE(qt_filterEvent):event])
        [super sendEvent:event];
}

@end

QT_BEGIN_NAMESPACE

void qt_redirectNSApplicationSendEvent()
{
    if (QCoreApplication::testAttribute(Qt::AA_PluginApplication))
        // In a plugin we cannot chain sendEvent hooks: a second plugin could
        // store the implementation of the first, which during the program flow
        // can be unloaded.
        return;

    if ([NSApp isMemberOfClass:[QT_MANGLE_NAMESPACE(QNSApplication) class]]) {
        // No need to change implementation since Qt
        // already controls a subclass of NSApplication
        return;
    }

    // Change the implementation of [NSApplication sendEvent] to the
    // implementation of qt_sendEvent_replacement found in QNSApplication.
    // And keep the old implementation that gets overwritten inside a new
    // method 'qt_sendEvent_original' that we add to NSApplication
    qt_cocoa_change_implementation(
            [NSApplication class],
            @selector(sendEvent:),
            [QT_MANGLE_NAMESPACE(QNSApplication) class],
            @selector(QT_MANGLE_NAMESPACE(qt_sendEvent_replacement):),
            @selector(QT_MANGLE_NAMESPACE(qt_sendEvent_original):));
 }

void qt_resetNSApplicationSendEvent()
{
    if (QCoreApplication::testAttribute(Qt::AA_PluginApplication))
        return;


    qt_cocoa_change_back_implementation([NSApplication class],
                                         @selector(sendEvent:),
                                         @selector(QT_MANGLE_NAMESPACE(qt_sendEvent_original):));
}

QT_END_NAMESPACE
