/*

     File: BulbView.m

 Abstract: View that hosts the custom CALayer subclass. Since the view hosts the layer in this case, it executes the animations when explicit animations are the enabled animation trigger. 

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#import "BulbView.h"

#import "BulbLayer.h"

#import "Defines.h"

@implementation BulbView

+(Class)layerClass {

    return [BulbLayer class];

}

-(id)init {

    if( self = [super init] ) {

        // define a default frame.

        self.image = [UIImage imageNamed:@"bulb.png"];

        self.frame = CGRectMake( 0, 0, self.image.size.width, self.image.size.height );

        // general bulb initializer

        [self generalInit];

    }

    return self;

}

// BulbView must be initialized via initWithFrame:.

-(id)initWithFrame:(CGRect)frame {

    if( ( self = [super initWithFrame:frame] ) ) {

        // general bulb initializer

        [self generalInit];

    }

    return self;

}

// General bulb initialization.

-(void)generalInit {

    NSLog(@"%s",__PRETTY_FUNCTION__);

    // Grab the bulb image and log whether or not we succeeded to load the image.

    self.image = [UIImage imageNamed:@"bulb.png"];

    NSLog(@"image==nil? %@",_image==nil?@"yes":@"no");

    // Get our layer to do a small custom configuration.

    CALayer* layer = [self layer];

    // By setting opaque to NO it defines our backing store to include an alpha channel.

    layer.opaque = NO;

    // The default bulb color is red.

    [self setColor:[UIColor redColor]];

}

// When a bulb color is set we define the color components used during our custom animation

-(void)setColor:(UIColor*)color {

    NSLog(@"%s",__PRETTY_FUNCTION__);

    _color = color;

    CGColorRef cgColor = color.CGColor;

    const CGFloat* colors = CGColorGetComponents( cgColor );

    self.red = colors[0] * 255.0;

    self.green = colors[1] * 255.0;

    self.blue = colors[2] * 255.0;

    NSLog(@"%s red: %f, green: %f, blue: %f",__PRETTY_FUNCTION__,self.red,self.green,self.blue );

}

// Toggle the On/Off state of the bulb. This triggers our custom animation.

-(void)setOn:(BOOL)on animated:(BOOL)animated {

    NSLog(@"%s",__PRETTY_FUNCTION__);

    if( !animated ) {

        ((BulbLayer*)self.layer).brightness = ((int)on) * 255;

        return;

    }

    if( on ) {

        if( self.on ) return;

        _on = on;

#if ANIMATION_TRIGGER_EXPLICIT

        [self animateFrom:0.0 to:255.0];

#endif

    } else {

        if( !self.on ) return; 

        _on = on;

#if ANIMATION_TRIGGER_EXPLICIT

        [self animateFrom:255.0 to:0.0];

#endif

    }

    // Set the model layer's brightness to the final value.

#if ANIMATION_TRIGGER_EXPLICIT

    // For explicit animations, disable implicit animations to avoid triggering the default action.

    [CATransaction begin];

    [CATransaction setDisableActions:YES];

#endif

    ((BulbLayer*)self.layer).brightness = ((int)on) * 255;

#if ANIMATION_TRIGGER_EXPLICIT

    [CATransaction commit];

#endif

}

// Executes the explicit animation.

-(void)animateFrom:(CGFloat)from to:(CGFloat)to {

    NSLog(@"%s",__PRETTY_FUNCTION__);

#if ANIMATION_TYPE_KEYFRAME

    // Create a basic interpolation for "briteness" animation

    CAKeyframeAnimation *theAnimation = [CAKeyframeAnimation animation];

    theAnimation.duration = 1.0;

    theAnimation.calculationMode = kCAAnimationDiscrete;

    theAnimation.values = @[

                            @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             @(0.0), @(255.0),

                             ];

#else

    CABasicAnimation* theAnimation = [CABasicAnimation animation];

    theAnimation.duration = 1.0;

    theAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];

    theAnimation.fromValue = @(from);

    theAnimation.toValue = @(to);

#endif

    [self.layer addAnimation:theAnimation forKey:@"brightness"];

}

// Unused. Layer delegate method for drawing is used instead.

-(void)drawRect:(CGRect)rect {

    NSLog(@"%s",__PRETTY_FUNCTION__);

}

// Layer delegate method for custom drawing.

// Color the bulb background and then draw our bulb image on top.

-(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)context {

    NSLog(@"%s",__PRETTY_FUNCTION__);

    // Get the current state of the bulb's "brightness"

    // Core Animation is animating this value on our behalf.

    CGFloat brightness = ((BulbLayer*)layer).brightness;

    NSLog(@"brightness: %f",brightness);

    // Calculate the bulbs current color (via RGB components) based on

    // the bulb's current "brightness".

    CGFloat redDiff = 255 - self.red;

    CGFloat greenDiff = 255 - self.green;

    CGFloat blueDiff = 255 - self.blue;

    CGFloat curRed = self.red + redDiff * ( brightness / 255.0 );

    CGFloat curGreen = self.green + greenDiff * ( brightness / 255.0 );

    CGFloat curBlue = self.blue + blueDiff * ( brightness / 255.0 );

    NSLog(@"curRed: %f, curGreen: %f, curBlue: %f",curRed,curGreen,curBlue);

    // Start an offscreen graphics context

    UIGraphicsBeginImageContextWithOptions( _image.size, YES, 1.0f );

    self.currentContext = UIGraphicsGetCurrentContext();

    CGRect imageRect = CGContextGetClipBoundingBox( self.currentContext );

    // Fill the context with our bulbs current color.

    UIColor* color = [UIColor colorWithRed:curRed/255.0 green:curGreen/255.0 blue:curBlue/255.0 alpha:1.0];

    [color set];

    UIBezierPath* path = [UIBezierPath bezierPathWithRect:CGContextGetClipBoundingBox( self.currentContext )];

    [path fill];

    // Draw the bulb image into the context.

    CGContextDrawImage( self.currentContext, imageRect, _image.CGImage );

    UIImage* image = UIGraphicsGetImageFromCurrentImageContext();

    NSLog(@"image==nil? %@",image==nil?@"yes":@"no");

    UIGraphicsEndImageContext();

    // Define the colors that will be masked out of the final image.

    const CGFloat maskingColors[6] = { 248.0, 255.0, 248.0, 255.0, 248.0, 255.0 };

    // Apply the mask and create the final image.

    CGImageRef finalImage = CGImageCreateWithMaskingColors( image.CGImage, maskingColors );

    NSLog(@"bulbMask2==NULL? %@",finalImage==NULL?@"yes":@"no");

    // Get our context's rect and draw the final bulb image into it.

    CGRect contextRect = CGContextGetClipBoundingBox( context );

    NSLog(@"contextRect: %@",NSStringFromCGRect( contextRect ) );

    CGContextDrawImage( context, contextRect, finalImage );

    // Release the final image. 

    CGImageRelease( finalImage );

}

// Touch handler for the bulb. Toggles the On/Off state.

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    NSLog(@"%s",__PRETTY_FUNCTION__);

    [self setOn:!self.on animated:YES];

}

@end