/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the plugins of the Qt Toolkit.
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** Public License version 3.0 as published by the Free Software Foundation
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****************************************************************************/
#include "qcocoawindow.h"
#include "qnswindowdelegate.h"
#include "qcocoaautoreleasepool.h"
#include "qcocoaglcontext.h"
#include "qcocoahelpers.h"
#include "qnsview.h"
#include <QtCore/private/qcore_mac_p.h>
#include <qwindow.h>
#include <QWindowSystemInterface>
#include <QPlatformScreen>

#include <Cocoa/Cocoa.h>
#include <Carbon/Carbon.h>

#include <QDebug>

@implementation QNSWindow

- (BOOL)canBecomeKeyWindow
{
    // The default implementation returns NO for title-bar less windows,
    // override and return yes here to make sure popup windows such as
    // the combobox popup can become the key window.
    return YES;
}

- (BOOL)canBecomeMainWindow
{
    BOOL canBecomeMain = YES; // By default, windows can become the main window

    // Windows with a transient parent (such as combobox popup windows)
    // cannot become the main window:
    if (m_cocoaPlatformWindow->window()->transientParent())
        canBecomeMain = NO;

    return canBecomeMain;
}


@end

@implementation QNSPanel

- (BOOL)canBecomeKeyWindow
{
    return NO;
}

@end

QCocoaWindow::QCocoaWindow(QWindow *tlw)
    : QPlatformWindow(tlw)
    , m_glContext(0)
    , m_inConstructor(true)
{
    QCocoaAutoReleasePool pool;

    m_contentView = [[QNSView alloc] initWithQWindow:tlw platformWindow:this];
    setGeometry(tlw->geometry());

    m_nsWindow = createNSWindow();
    setNSWindow(m_nsWindow);

    m_inConstructor = false;
}

QCocoaWindow::~QCocoaWindow()
{
    [m_contentView release];
    clearNSWindow(m_nsWindow);
    [m_nsWindow release];
}

void QCocoaWindow::setGeometry(const QRect &rect)
{
    if (geometry() == rect)
        return;
#ifdef QT_COCOA_ENABLE_WINDOW_DEBUG
    qDebug() << "QCocoaWindow::setGeometry" << this << rect;
#endif
    QPlatformWindow::setGeometry(rect);

    NSRect bounds = qt_mac_flipRect(rect, window());
    [m_nsWindow setContentSize : bounds.size];
    [m_nsWindow setFrameOrigin : bounds.origin];
}

void QCocoaWindow::setVisible(bool visible)
{
    QCocoaAutoReleasePool pool;
#ifdef QT_COCOA_ENABLE_WINDOW_DEBUG
    qDebug() << "QCocoaWindow::setVisible" << window() << visible;
#endif
    if (visible) {
        if (window()->transientParent()) {
            // The parent window might have moved while this window was hidden,
            // update the window geometry if there is a parent.
            setGeometry(window()->geometry());

            // Register popup windows so that the parent window can
            // close them when needed.
            if (window()->windowType() == Qt::Popup) {
                // qDebug() << "transientParent and popup" << window()->windowType() << Qt::Popup << (window()->windowType() & Qt::Popup);

                QCocoaWindow *parentCocoaWindow = static_cast<QCocoaWindow *>(window()->transientParent()->handle());
                parentCocoaWindow->m_activePopupWindow = window();
            }

        }

        // Make sure the QWindow has a frame ready before we show the NSWindow.
        QWindowSystemInterface::handleSynchronousExposeEvent(window(), QRect(QPoint(), geometry().size()));

        if ([m_nsWindow canBecomeKeyWindow])
            [m_nsWindow makeKeyAndOrderFront:nil];
        else
            [m_nsWindow orderFront: nil];
    } else {
        // qDebug() << "close" << this;
        [m_nsWindow orderOut:m_nsWindow];
    }
}

Qt::WindowFlags QCocoaWindow::setWindowFlags(Qt::WindowFlags flags)
{
    m_windowFlags = flags;
    return m_windowFlags;
}

void QCocoaWindow::setWindowTitle(const QString &title)
{
    QCocoaAutoReleasePool pool;

    CFStringRef windowTitle = QCFString::toCFStringRef(title);
    [m_nsWindow setTitle: const_cast<NSString *>(reinterpret_cast<const NSString *>(windowTitle))];
    CFRelease(windowTitle);
}

void QCocoaWindow::raise()
{
    //qDebug() << "raise" << this;
    // ### handle spaces (see Qt 4 raise_sys in qwidget_mac.mm)
    [m_nsWindow orderFront: m_nsWindow];
}

void QCocoaWindow::lower()
{
    [m_nsWindow orderBack: m_nsWindow];
}

void QCocoaWindow::propagateSizeHints()
{
    QCocoaAutoReleasePool pool;

    [m_nsWindow setMinSize : qt_mac_toNSSize(window()->minimumSize())];
    [m_nsWindow setMaxSize : qt_mac_toNSSize(window()->maximumSize())];

#ifdef QT_COCOA_ENABLE_WINDOW_DEBUG
    qDebug() << "QCocoaWindow::propagateSizeHints" << this;
    qDebug() << "     min/max " << window()->minimumSize() << window()->maximumSize();
    qDebug() << "     basesize" << window()->baseSize();
    qDebug() << "     geometry" << geometry();
#endif

    if (!window()->sizeIncrement().isNull())
        [m_nsWindow setResizeIncrements : qt_mac_toNSSize(window()->sizeIncrement())];

    QSize baseSize = window()->baseSize();
    if (!baseSize.isNull() && baseSize.isValid()) {
        [m_nsWindow setFrameSize : NSMakeSize(baseSize.width(), baseSize.height()) display : YES];
    }
}

bool QCocoaWindow::setKeyboardGrabEnabled(bool grab)
{
    if (grab && ![m_nsWindow isKeyWindow])
        [m_nsWindow makeKeyWindow];
    else if (!grab && [m_nsWindow isKeyWindow])
        [m_nsWindow resignKeyWindow];
    return true;
}

bool QCocoaWindow::setMouseGrabEnabled(bool grab)
{
    if (grab && ![m_nsWindow isKeyWindow])
        [m_nsWindow makeKeyWindow];
    else if (!grab && [m_nsWindow isKeyWindow])
        [m_nsWindow resignKeyWindow];
    return true;
}

WId QCocoaWindow::winId() const
{
    return WId(m_nsWindow);
}

void QCocoaWindow::setParent(const QPlatformWindow *window)
{
    // recreate the window for compatibility
    clearNSWindow(m_nsWindow);
    [m_nsWindow close];
    [m_nsWindow release];

    m_nsWindow = createNSWindow();
    setNSWindow(m_nsWindow);
}

NSView *QCocoaWindow::contentView() const
{
    return [m_nsWindow contentView];
}

void QCocoaWindow::windowWillMove()
{
    // Close any open popups on window move
    if (m_activePopupWindow) {
        QWindowSystemInterface::handleSynchronousCloseEvent(m_activePopupWindow);
        m_activePopupWindow = 0;
    }
}

void QCocoaWindow::windowDidMove()
{
    [m_contentView updateGeometry];
}

void QCocoaWindow::windowDidResize()
{
    NSRect rect = [[m_nsWindow contentView]frame];
    // Call setFrameSize which will trigger a frameDidChangeNotification on QNSView.
    [[m_nsWindow contentView] setFrameSize:rect.size];
}

void QCocoaWindow::windowWillClose()
{
    QWindowSystemInterface::handleSynchronousCloseEvent(window());
}

void QCocoaWindow::setCurrentContext(QCocoaGLContext *context)
{
    m_glContext = context;
}

QCocoaGLContext *QCocoaWindow::currentContext() const
{
    return m_glContext;
}

NSWindow * QCocoaWindow::createNSWindow()
{
    QCocoaAutoReleasePool pool;

    NSRect frame = qt_mac_flipRect(window()->geometry(), window());

    Qt::WindowType type = window()->windowType();
    Qt::WindowFlags flags = window()->windowFlags();

    NSUInteger styleMask;
    NSWindow *createdWindow = 0;

    // Use NSPanel for popup-type windows. (Popup, Tool, ToolTip, SplashScreen)
    if ((type & Qt::Popup) == Qt::Popup) {
        if (type == Qt::Popup || type == Qt::ToolTip || type == Qt::SplashScreen) {
            styleMask = NSBorderlessWindowMask;
        } else {
            styleMask = (NSUtilityWindowMask | NSResizableWindowMask | NSClosableWindowMask |
                         NSMiniaturizableWindowMask | NSTitledWindowMask);
        }

        QNSPanel *window;
        window  = [[QNSPanel alloc] initWithContentRect:frame
                                         styleMask: styleMask
                                         backing:NSBackingStoreBuffered
                                         defer:NO]; // Deferring window creation breaks OpenGL (the GL context is set up
                                                    // before the window is shown and needs a proper window.).
        [window setHasShadow:YES];
        createdWindow = window;
    } else {
        styleMask = (NSResizableWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask | NSTitledWindowMask);
        QNSWindow *window;
        window  = [[QNSWindow alloc] initWithContentRect:frame
                                         styleMask: styleMask
                                         backing:NSBackingStoreBuffered
                                         defer:NO]; // Deferring window creation breaks OpenGL (the GL context is set up
                                                    // before the window is shown and needs a proper window.).
        window->m_cocoaPlatformWindow = this;
        createdWindow = window;
    }
    return createdWindow;
}

void QCocoaWindow::setNSWindow(NSWindow *window)
{
    QNSWindowDelegate *delegate = [[QNSWindowDelegate alloc] initWithQCocoaWindow:this];
    [window setDelegate:delegate];
    [window setAcceptsMouseMovedEvents:YES];

    // Prevent Cocoa from releasing the window on close. Qt
    // handles the close event asynchronously and we want to
    // make sure that m_nsWindow stays valid until the
    // QCocoaWindow is deleted by Qt.
    [window setReleasedWhenClosed : NO];

    [[NSNotificationCenter defaultCenter] addObserver:m_contentView
                                          selector:@selector(windowDidBecomeKey)
                                          name:NSWindowDidBecomeKeyNotification
                                          object:m_nsWindow];

    [[NSNotificationCenter defaultCenter] addObserver:m_contentView
                                          selector:@selector(windowDidResignKey)
                                          name:NSWindowDidResignKeyNotification
                                          object:m_nsWindow];

    [[NSNotificationCenter defaultCenter] addObserver:m_contentView
                                          selector:@selector(windowDidBecomeMain)
                                          name:NSWindowDidBecomeMainNotification
                                          object:m_nsWindow];

    [[NSNotificationCenter defaultCenter] addObserver:m_contentView
                                          selector:@selector(windowDidResignMain)
                                          name:NSWindowDidResignMainNotification
                                          object:m_nsWindow];


    // ### Accept touch events by default.
    // Beware that enabling touch events has a negative impact on the overall performance.
    // We probably need a QWindowSystemInterface API to enable/disable touch events.
    [m_contentView setAcceptsTouchEvents:YES];

    [window setContentView:m_contentView];
}

void QCocoaWindow::clearNSWindow(NSWindow *window)
{
    [[NSNotificationCenter defaultCenter] removeObserver:m_contentView];
}

// Returns the current global screen geometry for the nswindow associated with this window.
QRect QCocoaWindow::windowGeometry() const
{
    NSRect rect = [m_nsWindow frame];
    QPlatformScreen *onScreen = QPlatformScreen::platformScreenForWindow(window());
    int flippedY = onScreen->geometry().height() - rect.origin.y - rect.size.height;  // account for nswindow inverted y.
    QRect qRect = QRect(rect.origin.x, flippedY, rect.size.width, rect.size.height);
    return qRect;
}

// Returns a pointer to the parent QCocoaWindow for this window, or 0 if there is none.
QCocoaWindow *QCocoaWindow::parentCocoaWindow() const
{
    if (window() && window()->transientParent()) {
        return static_cast<QCocoaWindow*>(window()->transientParent()->handle());
    }
    return 0;
}