//
// RTSpinKitArcAltAnimation.m
// SpinKit
//
// Copyright (c) 2014 Ramon Torres
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#import "RTSpinKitArcAltAnimation.h"

@implementation RTSpinKitArcAltAnimation

-(void)setupSpinKitAnimationInLayer:(CALayer *)layer withSize:(CGSize)size color:(UIColor *)color
{
    NSTimeInterval beginTime = CACurrentMediaTime();
    
    CGRect  frame  = CGRectInset(CGRectMake(0.0, 0.0, size.width, size.height), 2.0, 2.0);
    CGFloat radius = CGRectGetWidth(frame) / 2.0;
    CGPoint center = CGPointMake(CGRectGetMidX(frame), CGRectGetMidY(frame));
    
    CALayer *arc = [CALayer layer];
    arc.frame           = CGRectMake(0.0, 0.0, size.width, size.height);
    arc.backgroundColor = color.CGColor;
    arc.anchorPoint     = CGPointMake(0.5, 0.5);
    arc.cornerRadius    = CGRectGetWidth(arc.frame) / 2.0;

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddArc(path, NULL, center.x, center.y, radius, 0.0, M_PI * 2.0, NO);

    CAShapeLayer *mask = [CAShapeLayer layer];
    mask.frame         = CGRectMake(0.0, 0.0, size.width, size.height);
    mask.path          = path;
    mask.strokeColor   = [[UIColor blackColor] CGColor];
    mask.fillColor     = [[UIColor clearColor] CGColor];
    mask.lineWidth     = 2.0;
    mask.cornerRadius  = frame.size.width / 2.0;
    mask.anchorPoint   = CGPointMake(0.5, 0.5);

    arc.mask = mask;
    
    CGPathRelease(path);
    
    CGFloat duration = 1.2;

    CAKeyframeAnimation *strokeEndAnim = [CAKeyframeAnimation animationWithKeyPath:@"strokeEnd"];
    strokeEndAnim.removedOnCompletion = NO;
    strokeEndAnim.repeatCount = HUGE_VALF;
    strokeEndAnim.duration    = duration;
    strokeEndAnim.beginTime   = beginTime;
    strokeEndAnim.keyTimes    = @[@(0.0), @(0.4), @(1.0)];
    strokeEndAnim.values      = @[@(0.0), @(1.0), @(1.0)];
    strokeEndAnim.timingFunctions = @[
        [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
        [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
        [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
    ];

    CAKeyframeAnimation *strokeStartAnim = [CAKeyframeAnimation animationWithKeyPath:@"strokeStart"];
    strokeStartAnim.removedOnCompletion = NO;
    strokeStartAnim.repeatCount = HUGE_VALF;
    strokeStartAnim.duration    = duration;
    strokeStartAnim.beginTime   = beginTime;
    strokeStartAnim.keyTimes    = @[@(0.0), @(0.6), @(1.0)];
    strokeStartAnim.values      = @[@(0.0), @(0.0), @(1.0)];
    strokeStartAnim.timingFunctions = @[
        [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
        [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
        [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
    ];

    [layer addSublayer:arc];
    [mask addAnimation:strokeStartAnim forKey:@"spinkit-anim.start"];
    [mask addAnimation:strokeEndAnim forKey:@"spinkit-anim.end"];
}

@end