/* The file is the modified version of window_cocoa.mm from opencv-cocoa project by Andre Cohen */

/*M///////////////////////////////////////////////////////////////////////////////////////
//
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//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                         License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2010, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of Intel Corporation may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
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//M*/
#include "precomp.hpp"
#include "opencv2/imgproc.hpp"

#import <TargetConditionals.h>

#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
/*** begin IPhone OS Stubs ***/
// When highgui functions are referred to on iPhone OS, they will fail silently.
CV_IMPL int cvInitSystem( int argc, char** argv) { return 0;}
CV_IMPL int cvStartWindowThread(){ return 0; }
CV_IMPL void cvDestroyWindow( const char* name) {}
CV_IMPL void cvDestroyAllWindows( void ) {}
CV_IMPL void cvShowImage( const char* name, const CvArr* arr) {}
CV_IMPL void cvResizeWindow( const char* name, int width, int height) {}
CV_IMPL void cvMoveWindow( const char* name, int x, int y){}
CV_IMPL int cvCreateTrackbar (const char* trackbar_name,const char* window_name,
                              int* val, int count, CvTrackbarCallback on_notify) {return  0;}
CV_IMPL int cvCreateTrackbar2(const char* trackbar_name,const char* window_name,
                              int* val, int count, CvTrackbarCallback2 on_notify2, void* userdata) {return 0;}
CV_IMPL void cvSetMouseCallback( const char* name, CvMouseCallback function, void* info) {}
CV_IMPL int cvGetTrackbarPos( const char* trackbar_name, const char* window_name ) {return 0;}
CV_IMPL void cvSetTrackbarPos(const char* trackbar_name, const char* window_name, int pos) {}
CV_IMPL void cvSetTrackbarMax(const char* trackbar_name, const char* window_name, int maxval) {}
CV_IMPL void cvSetTrackbarMin(const char* trackbar_name, const char* window_name, int minval) {}
CV_IMPL void* cvGetWindowHandle( const char* name ) {return NULL;}
CV_IMPL const char* cvGetWindowName( void* window_handle ) {return NULL;}
CV_IMPL int cvNamedWindow( const char* name, int flags ) {return 0; }
CV_IMPL int cvWaitKey (int maxWait) {return 0;}
//*** end IphoneOS Stubs ***/
#else

#import <Cocoa/Cocoa.h>

#include <iostream>

const int MIN_SLIDER_WIDTH=200;

static NSApplication *application = nil;
static NSAutoreleasePool *pool = nil;
static NSMutableDictionary *windows = nil;
static bool wasInitialized = false;

@interface CVView : NSView
@property(retain) NSView *imageView;
@property(retain) NSImage *image;
@property int sliderHeight;
- (void)setImageData:(CvArr *)arr;
@end

@interface CVSlider : NSView {
    NSSlider *slider;
    NSTextField *name;
    int *value;
    void *userData;
    CvTrackbarCallback callback;
    CvTrackbarCallback2 callback2;
}
@property(retain) NSSlider *slider;
@property(retain) NSTextField *name;
@property(assign) int *value;
@property(assign) void *userData;
@property(assign) CvTrackbarCallback callback;
@property(assign) CvTrackbarCallback2 callback2;
@end

@interface CVWindow : NSWindow {
    NSMutableDictionary *sliders;
    CvMouseCallback mouseCallback;
    void *mouseParam;
    BOOL autosize;
    BOOL firstContent;
    int status;
    int x0, y0;
}
@property(assign) CvMouseCallback mouseCallback;
@property(assign) void *mouseParam;
@property(assign) BOOL autosize;
@property(assign) BOOL firstContent;
@property(assign) int x0;
@property(assign) int y0;
@property(retain) NSMutableDictionary *sliders;
@property(readwrite) int status;
- (CVView *)contentView;
- (void)cvSendMouseEvent:(NSEvent *)event type:(int)type flags:(int)flags;
- (void)cvMouseEvent:(NSEvent *)event;
- (void)createSliderWithName:(const char *)name maxValue:(int)max value:(int *)value callback:(CvTrackbarCallback)callback;
@end

/*static void icvCocoaCleanup(void)
{
    //cout << "icvCocoaCleanup" << endl;
    if( application )
    {
        cvDestroyAllWindows();
        //[application terminate:nil];
        application = 0;
        [pool release];
    }
}*/

CV_IMPL int cvInitSystem( int , char** )
{
    //cout << "cvInitSystem" << endl;
    wasInitialized = true;

    pool = [[NSAutoreleasePool alloc] init];
    application = [NSApplication sharedApplication];
    windows = [[NSMutableDictionary alloc] init];

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6

#ifndef NSAppKitVersionNumber10_5
#define NSAppKitVersionNumber10_5 949
#endif
    if( floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_5 )
        [application setActivationPolicy:NSApplicationActivationPolicyRegular];
#endif
    //[application finishLaunching];
    //atexit(icvCocoaCleanup);

    setlocale(LC_NUMERIC,"C");

    return 0;
}

static CVWindow *cvGetWindow(const char *name) {
    //cout << "cvGetWindow" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    NSString *cvname = [NSString stringWithFormat:@"%s", name];
    CVWindow* retval = (CVWindow*) [windows valueForKey:cvname] ;
    //cout << "retain count: " << [retval retainCount] << endl;
    //retval = [retval retain];
    //cout << "retain count: " << [retval retainCount] << endl;
    [localpool drain];
    //cout << "retain count: " << [retval retainCount] << endl;
    return retval;
}

CV_IMPL int cvStartWindowThread()
{
    //cout << "cvStartWindowThread" << endl;
    return 0;
}

CV_IMPL void cvDestroyWindow( const char* name)
{

    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    //cout << "cvDestroyWindow" << endl;
    CVWindow *window = cvGetWindow(name);
    if(window) {
        [window close];
        [windows removeObjectForKey:[NSString stringWithFormat:@"%s", name]];
    }
    [localpool drain];
}


CV_IMPL void cvDestroyAllWindows( void )
{
    //cout << "cvDestroyAllWindows" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    NSDictionary* list = [NSDictionary dictionaryWithDictionary:windows];
    for(NSString *key in list) {
        cvDestroyWindow([key cStringUsingEncoding:NSASCIIStringEncoding]);
    }
    [localpool drain];
}


CV_IMPL void cvShowImage( const char* name, const CvArr* arr)
{
    //cout << "cvShowImage" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    CVWindow *window = cvGetWindow(name);
    if(!window)
    {
        cvNamedWindow(name, CV_WINDOW_AUTOSIZE);
        window = cvGetWindow(name);
    }

    if(window)
    {
        bool empty = [[window contentView] image] == nil;
        NSRect vrectOld = [[window contentView] frame];
        NSSize oldImageSize = [[[window contentView] image] size];
        [[window contentView] setImageData:(CvArr *)arr];
        if([window autosize] || [window firstContent] || empty)
        {
            NSSize imageSize = [[[window contentView] image] size];
            // Only adjust the image size if the new image is a different size from the previous
            if (oldImageSize.height != imageSize.height || oldImageSize.width != imageSize.width)
            {
                //Set new view size considering sliders (reserve height and min width)
                NSSize scaledImageSize = imageSize;
                if ([[window contentView] respondsToSelector:@selector(convertSizeFromBacking:)])
                {
                    // Only resize for retina displays if the image is bigger than the screen
                    NSSize screenSize = NSScreen.mainScreen.visibleFrame.size;
                    CGFloat titleBarHeight = window.frame.size.height - [window contentRectForFrameRect:window.frame].size.height;
                    screenSize.height -= titleBarHeight;
                    if (imageSize.width > screenSize.width || imageSize.height > screenSize.height)
                    {
                        CGFloat fx = screenSize.width/std::max(imageSize.width, (CGFloat)1.f);
                        CGFloat fy = screenSize.height/std::max(imageSize.height, (CGFloat)1.f);
                        CGFloat min_f = std::min(fx, fy);
                        scaledImageSize = [[window contentView] convertSizeFromBacking:imageSize];
                        scaledImageSize.width = std::min(scaledImageSize.width, min_f*imageSize.width);
                        scaledImageSize.height = std::min(scaledImageSize.height, min_f*imageSize.height);
                    }
                }
                NSSize contentSize = vrectOld.size;
                contentSize.height = scaledImageSize.height + [window contentView].sliderHeight;
                contentSize.width = std::max<int>(scaledImageSize.width, MIN_SLIDER_WIDTH);
                [window setContentSize:contentSize]; //adjust sliders to fit new window size
                if([window firstContent])
                {
                    int x = [window x0];
                    int y = [window y0];
                    if(x >= 0 && y >= 0)
                    {
                        y = [[window screen] visibleFrame].size.height - y;
                        [window setFrameTopLeftPoint:NSMakePoint(x, y)];
                    }
                }
            }
        }
        [window setFirstContent:NO];
    }
    [localpool drain];
}

CV_IMPL void cvResizeWindow( const char* name, int width, int height)
{

    //cout << "cvResizeWindow" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    CVWindow *window = cvGetWindow(name);
    if(window && ![window autosize]) {
        height += [window contentView].sliderHeight;
        NSSize size = { (CGFloat)width, (CGFloat)height };
        [window setContentSize:size];
    }
    [localpool drain];
}

CV_IMPL void cvMoveWindow( const char* name, int x, int y)
{
    CV_FUNCNAME("cvMoveWindow");
    __BEGIN__;

    NSAutoreleasePool* localpool1 = [[NSAutoreleasePool alloc] init];
    CVWindow *window = nil;

    if(name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL window name" );
    //cout << "cvMoveWindow"<< endl;
    window = cvGetWindow(name);
    if(window) {
        if([window firstContent]) {
            [window setX0:x];
            [window setY0:y];
        }
        else {
            y = [[window screen] visibleFrame].size.height - y;
            [window setFrameTopLeftPoint:NSMakePoint(x, y)];
        }
    }
    [localpool1 drain];

    __END__;
}

CV_IMPL int cvCreateTrackbar (const char* trackbar_name,
                              const char* window_name,
                              int* val, int count,
                              CvTrackbarCallback on_notify)
{
    CV_FUNCNAME("cvCreateTrackbar");


    int result = 0;
    CVWindow *window = nil;
    NSAutoreleasePool* localpool2 = nil;

    __BEGIN__;
    if (localpool2 != nil) [localpool2 drain];
    localpool2 = [[NSAutoreleasePool alloc] init];

    if(window_name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL window name" );

    //cout << "cvCreateTrackbar" << endl ;
    window = cvGetWindow(window_name);
    if(window) {
        [window createSliderWithName:trackbar_name
                            maxValue:count
                               value:val
                            callback:on_notify];
        result = 1;
    }
    [localpool2 drain];
    __END__;
    return result;
}


CV_IMPL int cvCreateTrackbar2(const char* trackbar_name,
                              const char* window_name,
                              int* val, int count,
                              CvTrackbarCallback2 on_notify2,
                              void* userdata)
{
    //cout <<"cvCreateTrackbar2" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    int res = cvCreateTrackbar(trackbar_name, window_name, val, count, NULL);
    if(res) {
        CVWindow *window = cvGetWindow(window_name);
        if (window && [window respondsToSelector:@selector(sliders)]) {
            CVSlider *slider = [[window sliders] valueForKey:[NSString stringWithFormat:@"%s", trackbar_name]];
            [slider setCallback2:on_notify2];
            [slider setUserData:userdata];
        }
    }
    [localpool drain];
    return res;
}


CV_IMPL void
cvSetMouseCallback( const char* name, CvMouseCallback function, void* info)
{
    CV_FUNCNAME("cvSetMouseCallback");

    CVWindow *window = nil;
    NSAutoreleasePool* localpool3 = nil;
    __BEGIN__;
    //cout << "cvSetMouseCallback" << endl;

    if (localpool3 != nil) [localpool3 drain];
    localpool3 = [[NSAutoreleasePool alloc] init];

    if(name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL window name" );

    window = cvGetWindow(name);
    if(window) {
        [window setMouseCallback:function];
        [window setMouseParam:info];
    }
    [localpool3 drain];

    __END__;
}

 CV_IMPL int cvGetTrackbarPos( const char* trackbar_name, const char* window_name )
{
    CV_FUNCNAME("cvGetTrackbarPos");

    CVWindow *window = nil;
    int pos = -1;
    NSAutoreleasePool* localpool4 = nil;
    __BEGIN__;

    //cout << "cvGetTrackbarPos" << endl;
    if(trackbar_name == NULL || window_name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL trackbar or window name" );

    if (localpool4 != nil) [localpool4 drain];
    localpool4 = [[NSAutoreleasePool alloc] init];

    window = cvGetWindow(window_name);
    if(window && [window respondsToSelector:@selector(sliders)]) {
        CVSlider *slider = [[window sliders] valueForKey:[NSString stringWithFormat:@"%s", trackbar_name]];
        if(slider) {
            pos = [[slider slider] intValue];
        }
    }
    [localpool4 drain];
    __END__;
    return pos;
}

CV_IMPL void cvSetTrackbarPos(const char* trackbar_name, const char* window_name, int pos)
{
    CV_FUNCNAME("cvSetTrackbarPos");

    CVWindow *window = nil;
    CVSlider *slider = nil;
    NSAutoreleasePool* localpool5 = nil;

    __BEGIN__;
    //cout << "cvSetTrackbarPos" << endl;
    if(trackbar_name == NULL || window_name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL trackbar or window name" );

    if(pos < 0)
        CV_ERROR( CV_StsOutOfRange, "Bad trackbar maximal value" );

    if (localpool5 != nil) [localpool5 drain];
    localpool5 = [[NSAutoreleasePool alloc] init];

    window = cvGetWindow(window_name);
    if(window && [window respondsToSelector:@selector(sliders)]) {
        slider = [[window sliders] valueForKey:[NSString stringWithFormat:@"%s", trackbar_name]];
        if(slider) {
            [[slider slider] setIntValue:pos];
        }
    }
    [localpool5 drain];

    __END__;
}

CV_IMPL void cvSetTrackbarMax(const char* trackbar_name, const char* window_name, int maxval)
{
    CV_FUNCNAME("cvSetTrackbarMax");

    CVWindow *window = nil;
    CVSlider *slider = nil;
    NSAutoreleasePool* localpool5 = nil;

    __BEGIN__;
    //cout << "cvSetTrackbarPos" << endl;
    if(trackbar_name == NULL || window_name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL trackbar or window name" );

    if (localpool5 != nil) [localpool5 drain];
    localpool5 = [[NSAutoreleasePool alloc] init];

    window = cvGetWindow(window_name);
    if(window && [window respondsToSelector:@selector(sliders)]) {
        slider = [[window sliders] valueForKey:[NSString stringWithFormat:@"%s", trackbar_name]];
        if(slider) {
            if(maxval >= 0) {
                int minval = [[slider slider] minValue];
                maxval = (minval>maxval)?minval:maxval;
                [[slider slider] setMaxValue:maxval];
            }
        }
    }
    [localpool5 drain];

    __END__;
}

CV_IMPL void cvSetTrackbarMin(const char* trackbar_name, const char* window_name, int minval)
{
    CV_FUNCNAME("cvSetTrackbarMin");

    CVWindow *window = nil;
    CVSlider *slider = nil;
    NSAutoreleasePool* localpool5 = nil;

    __BEGIN__;
    if(trackbar_name == NULL || window_name == NULL)
        CV_ERROR( CV_StsNullPtr, "NULL trackbar or window name" );

    if (localpool5 != nil) [localpool5 drain];
    localpool5 = [[NSAutoreleasePool alloc] init];

    window = cvGetWindow(window_name);
    if(window && [window respondsToSelector:@selector(sliders)]) {
        slider = [[window sliders] valueForKey:[NSString stringWithFormat:@"%s", trackbar_name]];
        if(slider) {
            if(minval >= 0) {
                int maxval = [[slider slider] maxValue];
                minval = (minval<maxval)?minval:maxval;
                [[slider slider] setMinValue:minval];
            }
        }
    }
    [localpool5 drain];

    __END__;
}

CV_IMPL void* cvGetWindowHandle( const char* name )
{
    //cout << "cvGetWindowHandle" << endl;
    return cvGetWindow(name);
}


CV_IMPL const char* cvGetWindowName( void* window_handle )
{
    //cout << "cvGetWindowName" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    for(NSString *key in windows) {
        if([windows valueForKey:key] == window_handle) {
            [localpool drain];
            return [key UTF8String];
        }
    }
    [localpool drain];
    return 0;
}

CV_IMPL int cvNamedWindow( const char* name, int flags )
{
    if( !wasInitialized )
        cvInitSystem(0, 0);

    //cout << "cvNamedWindow" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    CVWindow *window = cvGetWindow(name);
    if( window )
    {
        [window setAutosize:(flags == CV_WINDOW_AUTOSIZE)];
        [localpool drain];
        return 0;
    }

    NSScreen* mainDisplay = [NSScreen mainScreen];

    NSString *windowName = [NSString stringWithFormat:@"%s", name];
    NSUInteger showResize = NSResizableWindowMask;
    NSUInteger styleMask = NSTitledWindowMask|NSMiniaturizableWindowMask|showResize;
    CGFloat windowWidth = [NSWindow minFrameWidthWithTitle:windowName styleMask:styleMask];
    NSRect initContentRect = NSMakeRect(0, 0, windowWidth, 0);
    if (mainDisplay) {
        NSRect dispFrame = [mainDisplay visibleFrame];
        initContentRect.origin.y = dispFrame.size.height-20;
    }


    window = [[CVWindow alloc] initWithContentRect:initContentRect
                                         styleMask:NSTitledWindowMask|NSMiniaturizableWindowMask|showResize
                                           backing:NSBackingStoreBuffered
                                             defer:YES
                                            screen:mainDisplay];

    [window setFrameTopLeftPoint:initContentRect.origin];

    [window setFirstContent:YES];
    [window setX0:-1];
    [window setY0:-1];

    [window setContentView:[[CVView alloc] init]];

    [window setHasShadow:YES];
    [window setAcceptsMouseMovedEvents:YES];
    [window useOptimizedDrawing:YES];
    [window setTitle:windowName];
    [window makeKeyAndOrderFront:nil];

    [window setAutosize:(flags == CV_WINDOW_AUTOSIZE)];

    [windows setValue:window forKey:windowName];

    [localpool drain];
    return [windows count]-1;
}

CV_IMPL int cvWaitKey (int maxWait)
{
    //cout << "cvWaitKey" << endl;
    int returnCode = -1;
    NSAutoreleasePool *localpool = [[NSAutoreleasePool alloc] init];
    double start = [[NSDate date] timeIntervalSince1970];

    while(true) {
        if(([[NSDate date] timeIntervalSince1970] - start) * 1000 >= maxWait && maxWait>0)
            break;

        //event = [application currentEvent];
        [localpool drain];
        localpool = [[NSAutoreleasePool alloc] init];

        NSEvent *event =
        [application
         nextEventMatchingMask:NSAnyEventMask
         untilDate://[NSDate dateWithTimeIntervalSinceNow: 1./100]
         [NSDate distantPast]
         inMode:NSDefaultRunLoopMode
         dequeue:YES];

        if([event type] == NSKeyDown) {
            returnCode = [[event characters] characterAtIndex:0];
            break;
        }

        [application sendEvent:event];
        [application updateWindows];

        [NSThread sleepForTimeInterval:1/100.];
    }
    [localpool drain];

    return returnCode;
}

CvRect cvGetWindowRect_COCOA( const char* name )
{
    CvRect result = cvRect(-1, -1, -1, -1);
    CVWindow *window = nil;

    CV_FUNCNAME( "cvGetWindowRect_COCOA" );

    __BEGIN__;
    if( name == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL name string" );
    }

    window = cvGetWindow( name );
    if ( window == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL window" );
    } else {
        NSRect rect = [window frame];
#if MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_6
        NSPoint pt = [window convertRectToScreen:rect].origin;
#else
        NSPoint pt = [window convertBaseToScreen:rect.origin];
#endif
        NSSize sz = [[[window contentView] image] size];
        result = cvRect(pt.x, pt.y, sz.width, sz.height);
    }

    __END__;
    return result;
}

double cvGetModeWindow_COCOA( const char* name )
{
    double result = -1;
    CVWindow *window = nil;

    CV_FUNCNAME( "cvGetModeWindow_COCOA" );

    __BEGIN__;
    if( name == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL name string" );
    }

    window = cvGetWindow( name );
    if ( window == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL window" );
    }

    result = window.status;

    __END__;
    return result;
}

void cvSetModeWindow_COCOA( const char* name, double prop_value )
{
    CVWindow *window = nil;
    NSDictionary *fullscreenOptions = nil;
    NSAutoreleasePool* localpool = nil;

    CV_FUNCNAME( "cvSetModeWindow_COCOA" );

    __BEGIN__;
    if( name == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL name string" );
    }

    window = cvGetWindow(name);
    if ( window == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL window" );
    }

    if ( [window autosize] )
    {
        return;
    }

    localpool = [[NSAutoreleasePool alloc] init];

    fullscreenOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:NSFullScreenModeSetting];
    if ( [[window contentView] isInFullScreenMode] && prop_value==CV_WINDOW_NORMAL )
    {
        [[window contentView] exitFullScreenModeWithOptions:fullscreenOptions];
        window.status=CV_WINDOW_NORMAL;
    }
    else if( ![[window contentView] isInFullScreenMode] && prop_value==CV_WINDOW_FULLSCREEN )
    {
        [[window contentView] enterFullScreenMode:[NSScreen mainScreen] withOptions:fullscreenOptions];
        window.status=CV_WINDOW_FULLSCREEN;
    }

    [localpool drain];

    __END__;
}

double cvGetPropTopmost_COCOA(const char* name)
{
    double    result = -1;
    CVWindow* window = nil;

    CV_FUNCNAME("cvGetPropTopmost_COCOA");

    __BEGIN__;
    if (name == NULL)
    {
        CV_ERROR(CV_StsNullPtr, "NULL name string");
    }

    window = cvGetWindow(name);
    if (window == NULL)
    {
        CV_ERROR(CV_StsNullPtr, "NULL window");
    }

    result = (window.level == NSStatusWindowLevel) ? 1 : 0;

    __END__;
    return result;
}

void cvSetPropTopmost_COCOA( const char* name, const bool topmost )
{
    CVWindow *window = nil;
    NSAutoreleasePool* localpool = nil;
    CV_FUNCNAME( "cvSetPropTopmost_COCOA" );

    __BEGIN__;
    if( name == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL name string" );
    }

    window = cvGetWindow(name);
    if ( window == NULL )
    {
        CV_ERROR( CV_StsNullPtr, "NULL window" );
    }

    if ([[window contentView] isInFullScreenMode])
    {
        EXIT;
    }

    localpool = [[NSAutoreleasePool alloc] init];
    if (topmost)
    {
        [window makeKeyAndOrderFront:window.self];
        [window setLevel:CGWindowLevelForKey(kCGMaximumWindowLevelKey)];
    }
    else
    {
        [window makeKeyAndOrderFront:nil];
    }
    [localpool drain];
    __END__;
}

void setWindowTitle_COCOA(const cv::String& winname, const cv::String& title)
{
    CVWindow *window = cvGetWindow(winname.c_str());

    if (window == NULL)
    {
        cv::namedWindow(winname);
        window = cvGetWindow(winname.c_str());
    }

    if (window == NULL)
        CV_Error(cv::Error::StsNullPtr, "NULL window");

    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];

    NSString *windowTitle = [NSString stringWithFormat:@"%s", title.c_str()];
    [window setTitle:windowTitle];

    [localpool drain];
}

static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
    CGFloat heightDiff = (base.height / constraint.height);
    CGFloat widthDiff = (base.width / constraint.width);
    if (heightDiff == 0) heightDiff = widthDiff;
    if (widthDiff == heightDiff) {
        return base;
    }
    else if (widthDiff > heightDiff) {
        NSSize out = { constraint.width / constraint.height * base.height, base.height };
        return out;
    }
    else {
        NSSize out = { base.width, constraint.height / constraint.width * base.width };
        return out;
    }
}

@implementation CVWindow

@synthesize mouseCallback;
@synthesize mouseParam;
@synthesize autosize;
@synthesize firstContent;
@synthesize x0;
@synthesize y0;
@synthesize sliders;
@synthesize status;

- (void)cvSendMouseEvent:(NSEvent *)event type:(int)type flags:(int)flags {
    (void)event;
    //cout << "cvSendMouseEvent" << endl;
    NSPoint mp = [NSEvent mouseLocation];
    //NSRect visible = [[self contentView] frame];
    mp = [self convertScreenToBase: mp];
    CVView *contentView = [self contentView];
    NSSize viewSize = contentView.frame.size;
    if (contentView.imageView) {
        viewSize = contentView.imageView.frame.size;
    }
    else {
        viewSize.height -= contentView.sliderHeight;
    }
    mp.y = viewSize.height - mp.y;

    NSSize imageSize = contentView.image.size;
    mp.y *= (imageSize.height / std::max(viewSize.height, 1.));
    mp.x *= (imageSize.width / std::max(viewSize.width, 1.));

    if( mp.x >= 0 && mp.y >= 0 && mp.x < imageSize.width && mp.y < imageSize.height )
        mouseCallback(type, mp.x, mp.y, flags, mouseParam);
}

- (void)cvMouseEvent:(NSEvent *)event {
    //cout << "cvMouseEvent" << endl;
    if(!mouseCallback)
        return;

    int flags = 0;
    if([event modifierFlags] & NSShiftKeyMask)		flags |= CV_EVENT_FLAG_SHIFTKEY;
    if([event modifierFlags] & NSControlKeyMask)	flags |= CV_EVENT_FLAG_CTRLKEY;
    if([event modifierFlags] & NSAlternateKeyMask)	flags |= CV_EVENT_FLAG_ALTKEY;

    if([event type] == NSLeftMouseDown)	{[self cvSendMouseEvent:event type:CV_EVENT_LBUTTONDOWN flags:flags | CV_EVENT_FLAG_LBUTTON];}
    if([event type] == NSLeftMouseUp)	{[self cvSendMouseEvent:event type:CV_EVENT_LBUTTONUP   flags:flags | CV_EVENT_FLAG_LBUTTON];}
    if([event type] == NSRightMouseDown){[self cvSendMouseEvent:event type:CV_EVENT_RBUTTONDOWN flags:flags | CV_EVENT_FLAG_RBUTTON];}
    if([event type] == NSRightMouseUp)	{[self cvSendMouseEvent:event type:CV_EVENT_RBUTTONUP   flags:flags | CV_EVENT_FLAG_RBUTTON];}
    if([event type] == NSOtherMouseDown){[self cvSendMouseEvent:event type:CV_EVENT_MBUTTONDOWN flags:flags];}
    if([event type] == NSOtherMouseUp)	{[self cvSendMouseEvent:event type:CV_EVENT_MBUTTONUP   flags:flags];}
    if([event type] == NSMouseMoved)	{[self cvSendMouseEvent:event type:CV_EVENT_MOUSEMOVE   flags:flags];}
    if([event type] == NSLeftMouseDragged) {[self cvSendMouseEvent:event type:CV_EVENT_MOUSEMOVE   flags:flags | CV_EVENT_FLAG_LBUTTON];}
    if([event type] == NSRightMouseDragged)	{[self cvSendMouseEvent:event type:CV_EVENT_MOUSEMOVE   flags:flags | CV_EVENT_FLAG_RBUTTON];}
    if([event type] == NSOtherMouseDragged)	{[self cvSendMouseEvent:event type:CV_EVENT_MOUSEMOVE   flags:flags | CV_EVENT_FLAG_MBUTTON];}
}
- (void)keyDown:(NSEvent *)theEvent {
    //cout << "keyDown" << endl;
    [super keyDown:theEvent];
}
- (void)rightMouseDragged:(NSEvent *)theEvent {
    //cout << "rightMouseDragged" << endl ;
    [self cvMouseEvent:theEvent];
}
- (void)rightMouseUp:(NSEvent *)theEvent {
    //cout << "rightMouseUp" << endl;
    [self cvMouseEvent:theEvent];
}
- (void)rightMouseDown:(NSEvent *)theEvent {
    // Does not seem to work?
    //cout << "rightMouseDown" << endl;
    [self cvMouseEvent:theEvent];
}
- (void)mouseMoved:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}
- (void)otherMouseDragged:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}
- (void)otherMouseUp:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}
- (void)otherMouseDown:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}
- (void)mouseDragged:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}
- (void)mouseUp:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}
- (void)mouseDown:(NSEvent *)theEvent {
    [self cvMouseEvent:theEvent];
}

- (void)createSliderWithName:(const char *)name maxValue:(int)max value:(int *)value callback:(CvTrackbarCallback)callback {
    //cout << "createSliderWithName" << endl;
    if(sliders == nil)
        sliders = [[NSMutableDictionary alloc] init];

    NSString *cvname = [NSString stringWithFormat:@"%s", name];

    // Avoid overwriting slider
    if([sliders valueForKey:cvname]!=nil)
        return;

    // Create slider
    CVSlider *slider = [[CVSlider alloc] init];
    [[slider name] setStringValue:cvname];
    [[slider slider] setMaxValue:max];
    [[slider slider] setMinValue:0];
    [[slider slider] setNumberOfTickMarks:(max+1)];
    [[slider slider] setAllowsTickMarkValuesOnly:YES];
    if(value)
    {
        [[slider slider] setIntValue:*value];
        [slider setValue:value];
    }
    if(callback)
        [slider setCallback:callback];

    // Save slider
    [sliders setValue:slider forKey:cvname];
    [[self contentView] addSubview:slider];


    //update contentView size to contain sliders
    NSSize viewSize=[[self contentView] frame].size,
           sliderSize=[slider frame].size;
    viewSize.height += sliderSize.height;
    viewSize.width = std::max<int>(viewSize.width, MIN_SLIDER_WIDTH);

    // Update slider sizes
    [self contentView].sliderHeight += sliderSize.height;

    if ([[self contentView] image] && ![[self contentView] imageView]) {
        [[self contentView] setNeedsDisplay:YES];
    }

    //update window size to contain sliders
    [self setContentSize: viewSize];
}

- (CVView *)contentView {
    return (CVView*)[super contentView];
}

@end

@implementation CVView

@synthesize image;

- (id)init {
    //cout << "CVView init" << endl;
    [super init];
    return self;
}

- (void)setImageData:(CvArr *)arr {
    //cout << "setImageData" << endl;
    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];

    cv::Mat arrMat = cv::cvarrToMat(arr);
    /*CGColorSpaceRef colorspace = NULL;
    CGDataProviderRef provider = NULL;
    int width = cvimage->width;
    int height = cvimage->height;

    colorspace = CGColorSpaceCreateDeviceRGB();

    int size = 8;
    int nbChannels = 3;

    provider = CGDataProviderCreateWithData(NULL, cvimage->data.ptr, width * height , NULL );

    CGImageRef imageRef = CGImageCreate(width, height, size , size*nbChannels , cvimage->step, colorspace,  kCGImageAlphaNone , provider, NULL, true, kCGRenderingIntentDefault);

    NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc] initWithCGImage:imageRef];
    if(image) {
        [image release];
    }*/

    NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
                pixelsWide:arrMat.cols
                pixelsHigh:arrMat.rows
                bitsPerSample:8
                samplesPerPixel:3
                hasAlpha:NO
                isPlanar:NO
                colorSpaceName:NSDeviceRGBColorSpace
                bitmapFormat: kCGImageAlphaNone
                bytesPerRow:((arrMat.cols * 3 + 3) & -4)
                bitsPerPixel:24];

    if (bitmap) {
        cv::Mat dst(arrMat.rows, arrMat.cols, CV_8UC3, [bitmap bitmapData], [bitmap bytesPerRow]);
        convertToShow(arrMat, dst);
    }
    else {
        // It's not guaranteed to like the bitsPerPixel:24, but this is a lot slower so we'd rather not do it
        bitmap = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
            pixelsWide:arrMat.cols
            pixelsHigh:arrMat.rows
            bitsPerSample:8
            samplesPerPixel:3
            hasAlpha:NO
            isPlanar:NO
            colorSpaceName:NSDeviceRGBColorSpace
            bytesPerRow:(arrMat.cols * 4)
            bitsPerPixel:32];
        cv::Mat dst(arrMat.rows, arrMat.cols, CV_8UC4, [bitmap bitmapData], [bitmap bytesPerRow]);
        convertToShow(arrMat, dst);
    }

    if( image ) {
        [image release];
    }

    image = [[NSImage alloc] init];
    [image addRepresentation:bitmap];
    [bitmap release];

    // This isn't supported on older versions of macOS
    // The performance issues this solves are mainly on newer versions of macOS, so that's fine
    if( floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_5 ) {
        if (![self imageView]) {
            [self setImageView:[[NSView alloc] init]];
            [[self imageView] setWantsLayer:true];
            [self addSubview:[self imageView]];
        }

        [[[self imageView] layer] setContents:image];

        NSRect imageViewFrame = [self frame];
        imageViewFrame.size.height -= [self sliderHeight];
        NSRect constrainedFrame = { imageViewFrame.origin, constrainAspectRatio(imageViewFrame.size, [image size]) };
        [[self imageView] setFrame:constrainedFrame];
    }
    else {
        NSRect redisplayRect = [self frame];
        redisplayRect.size.height -= [self sliderHeight];
        [self setNeedsDisplayInRect:redisplayRect];
    }

    /*CGColorSpaceRelease(colorspace);
    CGDataProviderRelease(provider);
    CGImageRelease(imageRef);*/

    [localpool drain];
}

- (void)setFrameSize:(NSSize)size {
    //cout << "setFrameSize" << endl;
    [super setFrameSize:size];

    NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
    int height = size.height;

    CVWindow *cvwindow = (CVWindow *)[self window];
    if ([cvwindow respondsToSelector:@selector(sliders)]) {
        for(NSString *key in [cvwindow sliders]) {
            CVSlider *slider = [[cvwindow sliders] valueForKey:key];
            NSRect r = [slider frame];
            r.origin.y = height - r.size.height;
            r.size.width = [[cvwindow contentView] frame].size.width;

            CGRect sliderRect = slider.slider.frame;
            CGFloat targetWidth = r.size.width - (sliderRect.origin.x + 10);
            sliderRect.size.width = targetWidth < 0 ? 0 : targetWidth;
            slider.slider.frame = sliderRect;

            [slider setFrame:r];
            height -= r.size.height;
        }
    }
    NSRect frame = self.frame;
    if (frame.size.height < self.sliderHeight) {
        frame.size.height = self.sliderHeight;
        self.frame = frame;
    }
    if ([self imageView]) {
        NSRect imageViewFrame = frame;
        imageViewFrame.size.height -= [self sliderHeight];
        NSRect constrainedFrame = { imageViewFrame.origin, constrainAspectRatio(imageViewFrame.size, [image size]) };
        [[self imageView] setFrame:constrainedFrame];
    }
    [localpool drain];
}

- (void)drawRect:(NSRect)rect {
    //cout << "drawRect" << endl;
    [super drawRect:rect];
    // If imageView exists, all drawing will be done by it and nothing needs to happen here
    if ([self image] && ![self imageView]) {
        NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];

        if(image != nil) {
            [image drawInRect: [self frame]
                     fromRect: NSZeroRect
                    operation: NSCompositeSourceOver
                     fraction: 1.0];
        }
        [localpool release];
    }
}

@end

@implementation CVSlider

@synthesize slider;
@synthesize name;
@synthesize value;
@synthesize userData;
@synthesize callback;
@synthesize callback2;

- (id)init {
    [super init];

    callback = NULL;
    value = NULL;
    userData = NULL;

    [self setFrame:NSMakeRect(0,0,200,30)];

    name = [[NSTextField alloc] initWithFrame:NSMakeRect(10, 0,110, 25)];
    [name setEditable:NO];
    [name setSelectable:NO];
    [name setBezeled:NO];
    [name setBordered:NO];
    [name setDrawsBackground:NO];
    [[name cell] setLineBreakMode:NSLineBreakByTruncatingTail];
    [self addSubview:name];

    slider = [[NSSlider alloc] initWithFrame:NSMakeRect(120, 0, 70, 25)];
    [slider setAutoresizingMask:NSViewWidthSizable];
    [slider setMinValue:0];
    [slider setMaxValue:100];
    [slider setContinuous:YES];
    [slider setTarget:self];
    [slider setAction:@selector(sliderChanged:)];
    [self addSubview:slider];

    [self setAutoresizingMask:NSViewWidthSizable];

    //[self setFrame:NSMakeRect(12, 0, 100, 30)];

    return self;
}

- (void)sliderChanged:(NSNotification *)notification {
    (void)notification;
    int pos = [slider intValue];
    if(value)
        *value = pos;
    if(callback)
        callback(pos);
    if(callback2)
        callback2(pos, userData);
}

@end

#endif

/* End of file. */
