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/****************************************************************************
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 ** Copyright (c) 2007-2008, Apple, Inc.
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 ****************************************************************************/


#import "qcocoaapplicationdelegate.h"
#import "qnswindowdelegate.h"
#import "qcocoamenuloader.h"
#include "qcocoaintegration.h"
#include <qevent.h>
#include <qurl.h>
#include <qdebug.h>
#include <qguiapplication.h>
#include <private/qguiapplication_p.h>
#include "qt_mac_p.h"
#include <qpa/qwindowsysteminterface.h>

QT_USE_NAMESPACE

static QCocoaApplicationDelegate *sharedCocoaApplicationDelegate = nil;

static void cleanupCocoaApplicationDelegate()
{
    [sharedCocoaApplicationDelegate release];
}

@implementation QCocoaApplicationDelegate

- (id)init
{
    self = [super init];
    if (self) {
        inLaunch = true;
        [[NSNotificationCenter defaultCenter]
                addObserver:self
                   selector:@selector(updateScreens:)
                       name:NSApplicationDidChangeScreenParametersNotification
                     object:NSApp];
    }
    return self;
}

- (void)updateScreens:(NSNotification *)notification
{
    Q_UNUSED(notification);
    if (QCocoaIntegration *ci = QCocoaIntegration::instance())
        ci->updateScreens();
}

- (void)dealloc
{
    sharedCocoaApplicationDelegate = nil;
    [dockMenu release];
    [qtMenuLoader release];
    if (reflectionDelegate) {
        [[NSApplication sharedApplication] setDelegate:reflectionDelegate];
        [reflectionDelegate release];
    }
    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [super dealloc];
}

+ (id)allocWithZone:(NSZone *)zone
{
    @synchronized(self) {
        if (sharedCocoaApplicationDelegate == nil) {
            sharedCocoaApplicationDelegate = [super allocWithZone:zone];
            return sharedCocoaApplicationDelegate;
            qAddPostRoutine(cleanupCocoaApplicationDelegate);
        }
    }
    return nil;
}

+ (QCocoaApplicationDelegate *)sharedDelegate
{
    @synchronized(self) {
        if (sharedCocoaApplicationDelegate == nil)
            [[self alloc] init];
    }
    return [[sharedCocoaApplicationDelegate retain] autorelease];
}

- (void)setDockMenu:(NSMenu*)newMenu
{
    [newMenu retain];
    [dockMenu release];
    dockMenu = newMenu;
}

- (NSMenu *)applicationDockMenu:(NSApplication *)sender
{
    Q_UNUSED(sender);
    return [[dockMenu retain] autorelease];
}

- (void)setMenuLoader:(QCocoaMenuLoader *)menuLoader
{
    [menuLoader retain];
    [qtMenuLoader release];
    qtMenuLoader = menuLoader;
}

- (QCocoaMenuLoader *)menuLoader
{
    return [[qtMenuLoader retain] autorelease];
}

- (BOOL) canQuit
{
    [[NSApp mainMenu] cancelTracking];

    bool handle_quit = true;
    NSMenuItem *quitMenuItem = [[[QCocoaApplicationDelegate sharedDelegate] menuLoader] quitMenuItem];
    if (!QGuiApplicationPrivate::instance()->modalWindowList.isEmpty()
        && [quitMenuItem isEnabled]) {
        int visible = 0;
        const QWindowList tlws = QGuiApplication::topLevelWindows();
        for (int i = 0; i < tlws.size(); ++i) {
            if (tlws.at(i)->isVisible())
                ++visible;
        }
        handle_quit = (visible <= 1);
    }

    if (handle_quit) {
        QCloseEvent ev;
        QGuiApplication::sendEvent(qGuiApp, &ev);
        if (ev.isAccepted()) {
            return YES;
        }
    }

    return NO;
}

// This function will only be called when NSApp is actually running.
- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
    // The reflection delegate gets precedence
    if (reflectionDelegate) {
        if ([reflectionDelegate respondsToSelector:@selector(applicationShouldTerminate:)])
            return [reflectionDelegate applicationShouldTerminate:sender];
//        return NSTerminateNow;
    }

    if ([self canQuit]) {
        if (!startedQuit) {
            startedQuit = true;
            // Close open windows. This is done in order to deliver de-expose
            // events while the event loop is still running.
            const QWindowList topLevels = QGuiApplication::topLevelWindows();
            for (int i = 0; i < topLevels.size(); ++i) {
                QWindow *topLevelWindow = topLevels.at(i);
                // Widgets have alreay received a CloseEvent from the QApplication
                // QCloseEvent handler. (see canQuit above). Prevent running the
                // CloseEvent logic twice, call close() directly.
                if (topLevelWindow->inherits("QWidgetWindow"))
                    topLevelWindow->close();
                else
                    QWindowSystemInterface::handleCloseEvent(topLevelWindow);
            }
            QWindowSystemInterface::flushWindowSystemEvents();

            QGuiApplication::exit(0);
            startedQuit = false;
        }
    }

    if (QGuiApplicationPrivate::instance()->threadData->eventLoops.isEmpty()) {
        // INVARIANT: No event loop is executing. This probably
        // means that Qt is used as a plugin, or as a part of a native
        // Cocoa application. In any case it should be fine to
        // terminate now:
        return NSTerminateNow;
    }

    return NSTerminateCancel;
}

- (void) applicationWillFinishLaunching:(NSNotification *)notification
{
    Q_UNUSED(notification);

    /*
        From the Cocoa documentation: "A good place to install event handlers
        is in the applicationWillFinishLaunching: method of the application
        delegate. At that point, the Application Kit has installed its default
        event handlers, so if you install a handler for one of the same events,
        it will replace the Application Kit version."
    */

    /*
        If Qt is used as a plugin, we let the 3rd party application handle
        events like quit and open file events. Otherwise, if we install our own
        handlers, we easily end up breaking functionality the 3rd party
        application depends on.
     */
    NSAppleEventManager *eventManager = [NSAppleEventManager sharedAppleEventManager];
    [eventManager setEventHandler:self
                      andSelector:@selector(appleEventQuit:withReplyEvent:)
                    forEventClass:kCoreEventClass
                       andEventID:kAEQuitApplication];
    [eventManager setEventHandler:self
                      andSelector:@selector(getUrl:withReplyEvent:)
                    forEventClass:kInternetEventClass
                       andEventID:kAEGetURL];
}

// called by QCocoaIntegration's destructor before resetting the application delegate to nil
- (void) removeAppleEventHandlers
{
    NSAppleEventManager *eventManager = [NSAppleEventManager sharedAppleEventManager];
    [eventManager removeEventHandlerForEventClass:kCoreEventClass andEventID:kAEQuitApplication];
    [eventManager removeEventHandlerForEventClass:kInternetEventClass andEventID:kAEGetURL];
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    Q_UNUSED(aNotification);
    inLaunch = false;
    // qt_release_apple_event_handler();


    // Insert code here to initialize your application
}



- (void)application:(NSApplication *)sender openFiles:(NSArray *)filenames
{
    Q_UNUSED(filenames);
    Q_UNUSED(sender);

    for (NSString *fileName in filenames) {
        QString qtFileName = QCFString::toQString(fileName);
        if (inLaunch) {
            // We need to be careful because Cocoa will be nice enough to take
            // command line arguments and send them to us as events. Given the history
            // of Qt Applications, this will result in behavior people don't want, as
            // they might be doing the opening themselves with the command line parsing.
            if (qApp->arguments().contains(qtFileName))
                continue;
        }
        QWindowSystemInterface::handleFileOpenEvent(qtFileName);
    }

    if (reflectionDelegate &&
        [reflectionDelegate respondsToSelector:@selector(application:openFiles:)])
        [reflectionDelegate application:sender openFiles:filenames];

}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender
{
    // If we have a reflection delegate, that will get to call the shots.
    if (reflectionDelegate
        && [reflectionDelegate respondsToSelector:
                            @selector(applicationShouldTerminateAfterLastWindowClosed:)])
        return [reflectionDelegate applicationShouldTerminateAfterLastWindowClosed:sender];
    return NO; // Someday qApp->quitOnLastWindowClosed(); when QApp and NSApp work closer together.
}


- (void)applicationDidBecomeActive:(NSNotification *)notification
{
    if (reflectionDelegate
        && [reflectionDelegate respondsToSelector:@selector(applicationDidBecomeActive:)])
        [reflectionDelegate applicationDidBecomeActive:notification];

/*
    onApplicationChangedActivation(true);

    if (!QWidget::mouseGrabber()){
        // Update enter/leave immidiatly, don't wait for a move event. But only
        // if no grab exists (even if the grab points to this widget, it seems, ref X11)
        QPoint qlocal, qglobal;
        QWidget *widgetUnderMouse = 0;
        qt_mac_getTargetForMouseEvent(0, QEvent::Enter, qlocal, qglobal, 0, &widgetUnderMouse);
        QApplicationPrivate::dispatchEnterLeave(widgetUnderMouse, 0);
        qt_last_mouse_receiver = widgetUnderMouse;
        qt_last_native_mouse_receiver = widgetUnderMouse ?
            (widgetUnderMouse->internalWinId() ? widgetUnderMouse : widgetUnderMouse->nativeParentWidget()) : 0;
    }
*/
}

- (void)applicationDidResignActive:(NSNotification *)notification
{
    if (reflectionDelegate
        && [reflectionDelegate respondsToSelector:@selector(applicationDidResignActive:)])
        [reflectionDelegate applicationDidResignActive:notification];

/*
    onApplicationChangedActivation(false);

    if (!QWidget::mouseGrabber())
        QApplicationPrivate::dispatchEnterLeave(0, qt_last_mouse_receiver);
    qt_last_mouse_receiver = 0;
    qt_last_native_mouse_receiver = 0;
    qt_button_down = 0;
*/
}

- (void)setReflectionDelegate:(NSObject <NSApplicationDelegate> *)oldDelegate
{
    [oldDelegate retain];
    [reflectionDelegate release];
    reflectionDelegate = oldDelegate;
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
{
    NSMethodSignature *result = [super methodSignatureForSelector:aSelector];
    if (!result && reflectionDelegate) {
        result = [reflectionDelegate methodSignatureForSelector:aSelector];
    }
    return result;
}

- (BOOL)respondsToSelector:(SEL)aSelector
{
    BOOL result = [super respondsToSelector:aSelector];
    if (!result && reflectionDelegate)
        result = [reflectionDelegate respondsToSelector:aSelector];
    return result;
}

- (void)forwardInvocation:(NSInvocation *)invocation
{
    SEL invocationSelector = [invocation selector];
    if (reflectionDelegate && [reflectionDelegate respondsToSelector:invocationSelector])
        [invocation invokeWithTarget:reflectionDelegate];
    else
        [self doesNotRecognizeSelector:invocationSelector];
}

- (void)getUrl:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent
{
    Q_UNUSED(replyEvent);
    NSString *urlString = [[event paramDescriptorForKeyword:keyDirectObject] stringValue];
	QWindowSystemInterface::handleFileOpenEvent(QUrl::fromNSURL([NSURL URLWithString:urlString]));
}

- (void)appleEventQuit:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent
{
    Q_UNUSED(event);
    Q_UNUSED(replyEvent);
    [NSApp terminate:self];
}

- (void)qtDispatcherToQAction:(id)sender
{
    Q_UNUSED(sender);
    [qtMenuLoader qtDispatcherToQPAMenuItem:sender];
}

@end
