/*

     File: CAUITransportButton.m

 Abstract: 

  Version: 1.1.2

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 */

#import "CAUITransportButton.h"

@implementation CAUITransportButton

{

    CAUITransportButtonStyle drawingStyle;

    CGColorRef               fillColor;

    CGRect                   imageRect;

}

- (id) initWithCoder:(NSCoder *)aDecoder {

    self = [super initWithCoder: aDecoder];

    if (self) {

        imageRect = self.bounds;

        CGFloat widthDelta = 44 - self.bounds.size.width;

        CGFloat heightDelta= 44 - self.bounds.size.height;

        if (widthDelta > 0 || heightDelta > 0) {

            // update the frame

            CGRect bounds = CGRectMake(0, 0, widthDelta > 0 ? 44 : imageRect.size.width, heightDelta > 0 ? 44 : imageRect.size.height);

            CGRect frame  = CGRectMake(widthDelta > 0 ? roundf(self.frame.origin.x - (widthDelta / 2)) : self.frame.origin.x,

                                       heightDelta > 0? roundf(self.frame.origin.y - (heightDelta/ 2)) : self.frame.origin.y,

                                       bounds.size.width, bounds.size.height);

            self.frame = frame;

            self.bounds = bounds;

        }

    }

    return self;

}

+ (Class) layerClass {

    return [CAShapeLayer class];

}

double toRadians(double degrees) {

    return (degrees * M_PI)/180.0;

}

/* sets the drawing style of the button and updates the appearance of the button */

- (void) setDrawingStyle:(CAUITransportButtonStyle) style {

    if (drawingStyle != style) {

        drawingStyle = style;

        CGPathRef path = [self newPathRefForStyle: style];

        ((CAShapeLayer *)self.layer).path = path;

        CGPathRelease(path);

        self.backgroundColor = [UIColor clearColor];

        if (style == recordEnabledButtonStyle) {

            [UIView animateWithDuration:1 delay:0 options: UIViewAnimationOptionCurveLinear animations: ^{

                    ((CAShapeLayer *)self.layer).strokeColor = fillColor;

                    ((CAShapeLayer *)self.layer).fillColor = fillColor;

                    ((CAShapeLayer *)self.layer).lineWidth = .5;

                    [self flash];

                }           completion:nil];

        } else if (style == recordButtonStyle) {

            [((CAShapeLayer *)self.layer) removeAllAnimations];

            [UIView animateWithDuration:1 delay:0 options: UIViewAnimationOptionCurveLinear animations: ^{

                    ((CAShapeLayer *)self.layer).strokeColor = [UIColor clearColor].CGColor;

                    ((CAShapeLayer *)self.layer).fillColor = fillColor;

                    ((CAShapeLayer *)self.layer).lineWidth = 0;

                }           completion:NULL];

        }

    }

}

- (void) flash {

    UIColor *color = [[UIColor colorWithCGColor: fillColor] colorWithAlphaComponent: .2];

    [CATransaction begin];

    CABasicAnimation *strokeAnim = [CABasicAnimation animationWithKeyPath:@"fillColor"];

    strokeAnim.fromValue         = (id) ((CAShapeLayer *)self.layer).fillColor;

    strokeAnim.toValue           = (id) color.CGColor;

    strokeAnim.duration          = 2.0;

    strokeAnim.repeatCount       = 0;

    strokeAnim.autoreverses      = YES;

    [CATransaction setCompletionBlock: ^{

        if (drawingStyle == recordEnabledButtonStyle)

            [self flash];

    }];

    [((CAShapeLayer *)self.layer) addAnimation:strokeAnim forKey:@"animateStrokeColor"];

    [CATransaction commit];

}

- (CAUITransportButtonStyle) drawingStyle {

    return drawingStyle;

}

- (void) setFillColor:(CGColorRef)color {

    fillColor = color;

    ((CAShapeLayer *)self.layer).fillColor = color;

}

- (CGColorRef) fillColor {

    return fillColor;

}

- (CGPathRef) newPathRefForStyle: (CAUITransportButtonStyle) style {

    CGPathRef path = NULL;

    CGFloat size = MIN(imageRect.size.width, imageRect.size.height);

    switch (style) {

        case rewindButtonStyle:

        {

            CGMutablePathRef tempPath = CGPathCreateMutable();

            CGFloat height = size * 0.613;

            CGFloat width = size;

            CGFloat yOffset = roundf((imageRect.size.height - height)/2);

            CGFloat radius  = (size * .0631)/2;

            height = roundf(height);

            // first arrow

            CGPathAddArc(tempPath, NULL, radius, yOffset + height/2, radius, toRadians(120), toRadians(240), NO);

            CGPathAddArc(tempPath, NULL, .5 * width - radius, yOffset + radius, radius, toRadians(240), toRadians(0), NO);

            CGPathAddArc(tempPath, NULL, .5 * width - radius, yOffset + height - radius, radius, toRadians(0), toRadians(120), NO);

            CGPathCloseSubpath(tempPath);

            // second arrow

            CGPathMoveToPoint(tempPath, NULL, .5*size, yOffset + height/2);

            CGPathAddArc(tempPath, NULL, .5*size + radius, yOffset + height/2, radius, toRadians(180), toRadians(240), NO);

            CGPathAddArc(tempPath, NULL, width - radius, yOffset + radius, radius, toRadians(240), toRadians(0), NO);

            CGPathAddArc(tempPath, NULL, width - radius, yOffset + height - radius, radius, toRadians(0), toRadians(120), NO);

            CGPathAddArc(tempPath, NULL, .5*size + radius, yOffset + height/2, radius, toRadians(120), toRadians(180), NO);

            CGPathCloseSubpath(tempPath);

            path = tempPath;

        }

            break;

        case pauseButtonStyle:

        {

            CGMutablePathRef tempPath = CGPathCreateMutable();

            CGFloat height = size * 0.857;

            CGFloat width  = size * .7452;

            CGFloat barWidth = size * .2776;

            CGFloat xOffset = roundf((imageRect.size.width - width)/2);

            CGFloat yOffset = roundf((imageRect.size.height - height)/2);

            CGFloat radius = (size * 0.0397)/2;

            height = roundf(height);

            CGPathAddRoundedRect(tempPath, NULL, CGRectMake(xOffset, yOffset, barWidth, height), radius, radius);

            CGPathAddRoundedRect(tempPath, NULL, CGRectMake(roundf(imageRect.size.width - xOffset - barWidth), yOffset, barWidth, height), radius, radius);

            path = tempPath;

        }

            break;

        case playButtonStyle:

        {

            CGMutablePathRef tempPath = CGPathCreateMutable();

            CGFloat height = size * .857;

            CGFloat width  = size * .6538;

            CGFloat xOffset = roundf((imageRect.size.width - width)/2);

            CGFloat yOffset = roundf((imageRect.size.height - height)/2);

            CGFloat radius  = (size * .0631)/2;

            height = roundf(height);

            CGPathAddArc(tempPath, NULL, xOffset + radius, yOffset + radius, radius, toRadians(180), toRadians(300), NO);

            CGPathAddArc(tempPath, NULL, xOffset + width - radius, yOffset + height/2, radius, toRadians(300), toRadians(60), NO);

            CGPathAddArc(tempPath, NULL, xOffset + radius, yOffset + height - radius, radius, toRadians(60), toRadians(180), NO);

            CGPathCloseSubpath(tempPath);

            path = tempPath;

        }

            break;

        case recordButtonStyle:

        case recordEnabledButtonStyle:

        {

            size *= .7825;

            CGRect elipseRect = CGRectMake((imageRect.size.width - size)/2, (imageRect.size.height - size)/2, size, size);

            path = CGPathCreateWithEllipseInRect(elipseRect, NULL);

        }

            break;

    }

    return path;

}

@end