/*

     File: AnnotationDocument.m

 Abstract: The AnnotationDocument is the document object of the app. It contains the layers.

  Version: 1.3

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "AnnotationDocument.h"

#import "AnnotationView.h"

@interface AnnotationDocument (private) 

- (void)createOutputImage;

@end

@implementation AnnotationDocument

#pragma mark -

#pragma mark Init and Dealloc

- (id)initWithImageURL:(NSURL*)inURL renderView:(AnnotationView*)inRenderView

{

    CGRect  documentRect;

    CIFilter    *colorFilter = [CIFilter filterWithName:@"CIConstantColorGenerator"];

    CIFilter    *cropFilter = [CIFilter filterWithName:@"CICrop"];

    self = [super init];

    if(!self)

    return nil;

    renderView = inRenderView;

    // create the layer that holds the image we want to annotate

    imageLayer = [[CIImageLayer alloc] initWithDelegate:self imageURL:inURL];

    documentRect = [imageLayer getRect];    // the image determines the size of our docment

    // create the text annotation layer

    textLayer = [[CITextLayer alloc] initWithDelegate:self targetRect:documentRect ciContext:[renderView ciContext]];

    // create the paint annotation layer

    paintLayer = [[CIPaintLayer alloc] initWithDelegate:self targetRect:documentRect];

    // create the peel off filter - page curl transition

    peelOffFilter = [[CIFilter filterWithName:@"CIPageCurlTransition"] retain];

    [peelOffFilter setDefaults];

    annotationPeel = 0.0;       // by default show both images

    [peelOffFilter setValue:[NSNumber numberWithDouble:annotationPeel] forKey:@"inputTime"];

    // set the shine image as it is static

    [peelOffFilter setValue:[CIImage imageWithContentsOfURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"restrictedshine" ofType: @"tiff"]]] forKey:@"inputShadingImage"];    

    [peelOffFilter setValue:[NSNumber numberWithDouble:0.3] forKey:@"inputAngle"];    // this is the angle at which we want to peel off the annotations

    // create a filter to composite the text and paint annotations together

    annotationCompositeFilter = [[CIFilter filterWithName:@"CISourceOverCompositing"] retain];

    [annotationCompositeFilter setDefaults];

    // create a filter that composites the annotation composite with a backing/parchment image for the backside of the peel off

    annotationCompositeBackingFilter = [[CIFilter filterWithName:@"CISourceOverCompositing"] retain];

    [annotationCompositeBackingFilter setDefaults];

    [colorFilter setValue:[CIColor colorWithRed:0.2 green:0.2 blue:0.2 alpha:0.8] forKey:@"inputColor"];

    [cropFilter setValue:[colorFilter valueForKey:@"outputImage"] forKey:@"inputImage"];

    [cropFilter setValue:[CIVector vectorWithX:documentRect.origin.x Y:documentRect.origin.y Z:documentRect.size.width W:documentRect.size.height] forKey:@"inputRectangle"];    

    parchmentBackingImage = [[cropFilter valueForKey:@"outputImage"] retain];

    // setup the view size

    [renderView setFrame:*(NSRect*)&documentRect];

    [renderView setBounds:*(NSRect*)&documentRect];

    [[renderView window] setMaxSize:*(NSSize*)&(documentRect.size)];

    // setup if lens should be shown

    [imageLayer showLens:(annotationPeel <= 0.0)];

    return self;

}

- (void)dealloc

{

    [renderView setImage:nil];

    [textLayer release];

    [paintLayer release];

    [imageLayer release];

    [peelOffFilter release];

    [annotationCompositeFilter release];

    [super dealloc];

}

#pragma mark -

#pragma mark Rendering methods

- (void)createOutputImage

{    

    CIImage *textImage = [textLayer getLayerImage];

    CIImage *paintImage = [paintLayer getLayerImage];

    // composite the text and paint annotations

    [annotationCompositeFilter setValue:textImage forKey:@"inputImage"];

    [annotationCompositeFilter setValue:paintImage forKey:@"inputBackgroundImage"];

    // special case the 'no peel' and 'full peel' states by leaving out the transition filter in those cases for better performance

    if(annotationPeel <= 0.0)

    {

    [annotationCompositeBackingFilter setValue:[annotationCompositeFilter valueForKey:@"outputImage"] forKey:@"inputImage"];

    [annotationCompositeBackingFilter setValue:[imageLayer getLayerImage] forKey:@"inputBackgroundImage"];

    outputImage = [annotationCompositeBackingFilter valueForKey:@"outputImage"];

    } else {

    [annotationCompositeBackingFilter setValue:parchmentBackingImage forKey:@"inputImage"];

    [annotationCompositeBackingFilter setValue:[annotationCompositeFilter valueForKey:@"outputImage"] forKey:@"inputBackgroundImage"];

    [peelOffFilter setValue:[imageLayer getLayerImage] forKey:@"inputTargetImage"];

    [peelOffFilter setValue:[annotationCompositeFilter valueForKey:@"outputImage"] forKey:@"inputImage"];

    [peelOffFilter setValue:[annotationCompositeBackingFilter valueForKey:@"outputImage"] forKey:@"inputBacksideImage"];    

    outputImage = [peelOffFilter valueForKey:@"outputImage"];

    }

}

- (void)exportImageToURL:(NSURL*)inURL

{

    CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);

    NSDictionary *options = @{ kCIContextOutputColorSpace:(id)colorSpace };

    CIContext *exportContext = [CIContext contextWithCGContext:[[[renderView window] graphicsContext] graphicsPort] options:options];

    CGColorSpaceRelease(colorSpace); // Owned by the context.

    // create an image destination (ImageIO's way of saying we want to save to a file format)

    // note: public.jpeg denotes that we are saving to JPEG

    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithURL((CFURLRef)inURL, (CFStringRef)@"public.jpeg", 1, nil);

    if (imageDestination == NULL) {

        NSLog(@"Problem creating image destination.");

        return;

    }

    CGImageRef renderedImage = [exportContext createCGImage:outputImage fromRect:[outputImage extent]];

    // add image to the ImageIO destination (specify the image we want to save)

    CGImageDestinationAddImage(imageDestination, renderedImage, NULL);

    // finalize: this saves the image to the JPEG format as data

    if (!CGImageDestinationFinalize(imageDestination))

    {

        NSLog(@"Problem writing JPEG file.");

    }

    CFRelease(imageDestination);

    CGImageRelease(renderedImage);

}

#pragma mark -

#pragma mark User interaction methods

- (void)setMode:(AnnotationEditingMode)inMode

{

    editMode = inMode;

}

- (void)setBrightness:(CGFloat)inValue

{

    [imageLayer setImageSetting:kBrightnessSetting value:inValue];

}

- (void)setContrast:(CGFloat)inValue

{

    [imageLayer setImageSetting:kContrastSetting value:inValue];

}

- (void)setSaturation:(CGFloat)inValue

{

    [imageLayer setImageSetting:kSaturationSetting value:inValue];

}

- (void)mouseDown:(NSEvent *)theEvent

{

    if([theEvent modifierFlags] & NSAlternateKeyMask)   // peel off the annotation layers

    {

    BOOL                dragActive = YES;

    NSPoint             location;

    NSAutoreleasePool       *myPool = nil;

    NSEvent*            event = NULL;

    NSWindow            *targetWindow = [renderView window];

    myPool = [[NSAutoreleasePool alloc] init];

    while (dragActive)

    {       

        event = [targetWindow nextEventMatchingMask:(NSLeftMouseDraggedMask | NSLeftMouseUpMask)

                                untilDate:[NSDate distantFuture]

                                inMode:NSEventTrackingRunLoopMode

                                dequeue:YES];

        if(!event)

            continue;

        location = [renderView convertPoint:[event locationInWindow] fromView:nil];

        switch ([event type])

        {

            case NSLeftMouseDragged:

                annotationPeel = (location.x * 2.0 / [renderView bounds].size.width);

                [imageLayer showLens:(annotationPeel <= 0.0)];

                [peelOffFilter setValue:[NSNumber numberWithDouble:annotationPeel] forKey:@"inputTime"];            

                [self refresh];

                break;

            case NSLeftMouseUp:

                dragActive = NO;

                break;

            default:

                break;

        }

    }

    [myPool release];

    } else {

    // handle mouse down events in the respective layer depending on the current edit mode

    switch(editMode)

    {

        case kMagnifyingMode:

        [imageLayer mouseDown:theEvent view:renderView];

        break;

        case kPaintMode:

        [paintLayer mouseDown:theEvent view:renderView];

        break;

        case kTextMode:

        [textLayer mouseDown:theEvent view:renderView];

        break;

    }

    }

}

#pragma mark -

#pragma mark Delegate methods

/* 

      Delegate methods

*/

- (void)refresh:(CGRect)dirtyRect

{

    [self createOutputImage];

    [renderView setImage:outputImage dirtyRect:dirtyRect];

}

- (void)refresh

{

    [self createOutputImage];

    [renderView setImage:outputImage dirtyRect:[outputImage extent]];

}

- (void)doTextEditSession:(TextObject*)textObject

{        

    //Create editor window if necessary

    if(!editorWindow) 

    {

        editorWindow = [[OverlayWindow alloc] initWithContentRect:[[renderView window] frame] styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO];

        [editorWindow setParentWindow:[renderView window]];

        [editorWindow setOpaque:NO];

        [editorWindow setReleasedWhenClosed:NO];

        textView = [[NSTextView alloc] initWithFrame:[[renderView window] frame]];

        [textView setRichText:YES];

        [textView setFieldEditor:YES];

        [[textView textContainer] setWidthTracksTextView:NO];

        [[textView textContainer] setHeightTracksTextView:NO];

        [textView setVerticallyResizable:YES];

        [textView setHorizontallyResizable:YES];

        [textView setDrawsBackground:YES];

        [textView setAllowsDocumentBackgroundColorChange:NO];

        [textView setBackgroundColor:[NSColor colorWithCalibratedRed:1.0 green:1.0 blue:1.0 alpha:0.4]];

        [textView setSelectable:YES];

        [textView setImportsGraphics:NO];

        [textView setDelegate:(id)self];

        [[editorWindow contentView] addSubview:textView];

    }

    [editorWindow setFrame:[[renderView window] frame] display:NO];

    //Preset string

    if([textObject getText])

        [[textView textStorage] setAttributedString:[textObject getText]];

    else

        [textView setString:@" "];

    [textView selectAll:nil];

    //Run editor modally

    NSPoint fieldOrigin = [textObject getTextRect].origin;

    fieldOrigin.x -= [renderView visibleRect].origin.x;

    fieldOrigin.y -= [renderView visibleRect].origin.y - 16.0;  //offset for the titlebar

    [textView setFrameOrigin:fieldOrigin];

    [textView setFrameSize:[textObject getTextRect].size];

    [textView setConstrainedFrameSize:[textObject getTextRect].size];

    [textView sizeToFit];

    [editorWindow setBackgroundColor:[NSColor clearColor]];

    [[editorWindow contentView] display];

    [[renderView window] addChildWindow:editorWindow ordered:NSWindowAbove];

    [editorWindow makeKeyAndOrderFront:nil];

    [editorWindow makeFirstResponder:textView];

    if([NSApp runModalForWindow:editorWindow] != NSRunAbortedResponse)

    {

        [textObject setText:[textView textStorage]];

    }

}

-(void)textDidEndEditing:(id)sender

{

    [[renderView window] removeChildWindow:editorWindow];

    [editorWindow close];

    [NSApp stopModal];

}

-(void)textDidChange:(id)sender

{

    [editorWindow display]; // otherwise the resizing text view will leave artifacts behind

}

@end