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#import "qiosviewcontroller.h"

#include <QtGui/QGuiApplication>
#include <QtGui/QWindow>
#include <QtGui/QScreen>

#include <QtGui/private/qwindow_p.h>

#include "qiosscreen.h"
#include "qiosglobal.h"
#include "qioswindow.h"
#include "quiview.h"

// -------------------------------------------------------------------------

@interface QIOSDesktopManagerView : UIView
@end

@implementation QIOSDesktopManagerView

- (void)layoutSubviews
{
    for (int i = int(self.subviews.count) - 1; i >= 0; --i) {
        UIView *view = static_cast<UIView *>([self.subviews objectAtIndex:i]);
        if (![view isKindOfClass:[QUIView class]])
            continue;

        [self layoutView: static_cast<QUIView *>(view)];
    }
}

- (void)layoutView:(QUIView *)view
{
    QWindow *window = view.qwindow;
    Q_ASSERT(window->handle());

    // Re-apply window states to update geometry
    if (window->windowState() & (Qt::WindowFullScreen | Qt::WindowMaximized))
        window->handle()->setWindowState(window->windowState());
}

// Even if the root view controller has both wantsFullScreenLayout and
// extendedLayoutIncludesOpaqueBars enabled, iOS will still push the root
// view down 20 pixels (and shrink the view accordingly) when the in-call
// statusbar is active (instead of updating the topLayoutGuide). Since
// we treat the root view controller as our screen, we want to reflect
// the in-call statusbar as a change in available geometry, not in screen
// geometry. To simplify the screen geometry mapping code we reset the
// view modifications that iOS does and take the statusbar height
// explicitly into account in QIOSScreen::updateProperties().

- (void)setFrame:(CGRect)newFrame
{
    [super setFrame:CGRectMake(0, 0, CGRectGetWidth(newFrame), CGRectGetHeight(self.window.bounds))];
}

- (void)setBounds:(CGRect)newBounds
{
    CGRect transformedWindowBounds = [self convertRect:self.window.bounds fromView:self.window];
    [super setBounds:CGRectMake(0, 0, CGRectGetWidth(newBounds), CGRectGetHeight(transformedWindowBounds))];
}

- (void)setCenter:(CGPoint)newCenter
{
    Q_UNUSED(newCenter);
    [super setCenter:self.window.center];
}

- (void)didMoveToWindow
{
    // The initial frame computed during startup may happen before the view has
    // a window, meaning our calculations above will be wrong. We ensure that the
    // frame is set correctly once we have a window to base our calulations on.
    [self setFrame:self.window.bounds];
}

@end

// -------------------------------------------------------------------------

@implementation QIOSViewController

- (id)initWithQIOSScreen:(QIOSScreen *)screen
{
    if (self = [self init]) {
        m_screen = screen;

#if QT_IOS_DEPLOYMENT_TARGET_BELOW(__IPHONE_7_0)
        QSysInfo::MacVersion iosVersion = QSysInfo::MacintoshVersion;

        // We prefer to keep the root viewcontroller in fullscreen layout, so that
        // we don't have to compensate for the viewcontroller position. This also
        // gives us the same behavior on iOS 5/6 as on iOS 7, where full screen layout
        // is the only way.
        if (iosVersion < QSysInfo::MV_IOS_7_0)
            self.wantsFullScreenLayout = YES;

        // Use translucent statusbar by default on iOS6 iPhones (unless the user changed
        // the default in the Info.plist), so that windows placed under the stausbar are
        // still visible, just like on iOS7.
        if (screen->uiScreen() == [UIScreen mainScreen]
            && iosVersion >= QSysInfo::MV_IOS_6_0 && iosVersion < QSysInfo::MV_IOS_7_0
            && [UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone
            && [UIApplication sharedApplication].statusBarStyle == UIStatusBarStyleDefault)
            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
#endif
    }

    return self;
}

- (void)loadView
{
    self.view = [[[QIOSDesktopManagerView alloc] init] autorelease];
}

-(BOOL)shouldAutorotate
{
    // Until a proper orientation and rotation API is in place, we always auto rotate.
    // If auto rotation is not wanted, you would need to switch it off manually from Info.plist.
    return YES;
}

#if QT_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__IPHONE_6_0)
-(NSUInteger)supportedInterfaceOrientations
{
    // We need to tell iOS that we support all orientations in order to set
    // status bar orientation when application content orientation changes.
    return UIInterfaceOrientationMaskAll;
}
#endif

#if QT_IOS_DEPLOYMENT_TARGET_BELOW(__IPHONE_6_0)
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    Q_UNUSED(interfaceOrientation);
    return YES;
}
#endif

- (void)viewWillLayoutSubviews
{
    if (!QCoreApplication::instance())
        return;

    m_screen->updateProperties();
}

#if QT_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__IPHONE_7_0)
- (UIStatusBarStyle)preferredStatusBarStyle
{
    // Since we don't place anything behind the status bare by default, we
    // end up with a black area, so we have to enable the white text mode
    // of the iOS7 statusbar.
    return UIStatusBarStyleLightContent;

    // FIXME: Try to detect the content underneath the statusbar and choose
    // an appropriate style, and/or expose Qt APIs to control the style.
}
#endif

- (BOOL)prefersStatusBarHidden
{
    static bool hiddenFromPlist = infoPlistValue(@"UIStatusBarHidden", false);
    if (hiddenFromPlist)
        return YES;
    QWindow *focusWindow = QGuiApplication::focusWindow();
    if (!focusWindow)
        return [UIApplication sharedApplication].statusBarHidden;

    return qt_window_private(focusWindow)->topLevelWindow()->windowState() == Qt::WindowFullScreen;
}

@end