//
//  IFTTTScaleAnimation.m
//  JazzHands
//
//  Created by Steven Mok on 1/10/14.
//  Copyright (c) 2014 IFTTT Inc. All rights reserved.
//

#import "IFTTTScaleAnimation.h"
#import "UIView+IFTTTJazzHands.h"

@implementation IFTTTScaleAnimation

- (void)addKeyframeForTime:(CGFloat)time scale:(CGFloat)scale
{
    if (![self validScale:scale]) return;
    [self addKeyframeForTime:time value:@(scale)];
}

- (void)addKeyframeForTime:(CGFloat)time scale:(CGFloat)scale withEasingFunction:(IFTTTEasingFunction)easingFunction
{
    if (![self validScale:scale]) return;
    [self addKeyframeForTime:time value:@(scale) withEasingFunction:easingFunction];
}

- (BOOL)validScale:(CGFloat)scale
{
    NSAssert((scale > 0), @"Scale must be greater than zero.");
    if (!(scale > 0)) return NO;
    return YES;
}

- (void)animate:(CGFloat)time
{
    if (!self.hasKeyframes) return;
    CGFloat scale = (CGFloat)[(NSNumber *)[self valueAtTime:time] floatValue];
    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(scale, scale);
    self.view.iftttScaleTransform = [NSValue valueWithCGAffineTransform:scaleTransform];
    CGAffineTransform newTransform = scaleTransform;
    if (self.view.iftttRotationTransform) {
        newTransform = CGAffineTransformConcat(newTransform, [self.view.iftttRotationTransform CGAffineTransformValue]);
    }
    if (self.view.iftttTranslationTransform) {
        newTransform = CGAffineTransformConcat(newTransform, [self.view.iftttTranslationTransform CGAffineTransformValue]);
    }
    self.view.transform = newTransform;
}

@end