#import "TGCheckButtonView.h"
#import "TGColor.h"

@interface TGCheckButtonView ()
{
    UIView *_wrapperView;
    
    CALayer *_checkBackground;
    
    TGCheckButtonStyle _style;
    CGSize _size;
    bool _borderOnTop;
    UIImage *_fillImage;
    
    UIView *_checkView;
    UIImageView *_checkFillView;
    UIView *_checkShortFragment;
    UIView *_checkLongFragment;
}
@end

@implementation TGCheckButtonView

static CGAffineTransform TGCheckButtonDefaultTransform;

- (instancetype)initWithStyle:(TGCheckButtonStyle)style
{
    CGSize size = CGSizeMake(32.0f, 32.0f);
    if (style == TGCheckButtonStyleGallery)
        size = CGSizeMake(42.0f, 42.0f);
    
    self = [super initWithFrame:CGRectMake(0, 0, size.width, size.height)];
    if (self != nil)
    {
        static dispatch_once_t onceToken;
        static NSMutableDictionary *backgroundImages;
        static NSMutableDictionary *fillImages;
        dispatch_once(&onceToken, ^
        {
            TGCheckButtonDefaultTransform = CGAffineTransformMakeRotation(-M_PI_4);
            backgroundImages = [[NSMutableDictionary alloc] init];
            fillImages = [[NSMutableDictionary alloc] init];
        });
        
        bool borderOnTop = false;
        CGFloat insideInset = 0.0f;
        switch (style)
        {
            case TGCheckButtonStyleGallery:
            {
                insideInset = 3.5f;
                borderOnTop = true;
            }
                
            case TGCheckButtonStyleMedia:
            {
                insideInset = 4.0f;
                borderOnTop = true;
            }
                break;
                
            case TGCheckButtonStyleBar:
            {
                insideInset = 2.0f;
            }
                break;
                
            default:
            {
                insideInset = 5.0f;
            }
                break;
        }
    
        UIImage *backgroundImage = backgroundImages[@(style)];
        if (backgroundImage == nil)
        {
            switch (style)
            {
                case TGCheckButtonStyleGallery:
                {
                    CGRect rect = CGRectMake(0, 0, size.width, size.height);
                    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0);
                    CGContextRef context = UIGraphicsGetCurrentContext();
                    CGContextSetShadowWithColor(context, CGSizeZero, 2.5f, [UIColor colorWithWhite:0.0f alpha:0.22f].CGColor);
                    CGContextSetLineWidth(context, 1.5f);
                    CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
                    CGContextStrokeEllipseInRect(context, CGRectInset(rect, insideInset + 0.5f, insideInset + 0.5f));
                    
                    backgroundImage = UIGraphicsGetImageFromCurrentImageContext();
                    UIGraphicsEndImageContext();
                }
                    break;
                    
                case TGCheckButtonStyleMedia:
                {
                    CGRect rect = CGRectMake(0, 0, size.width, size.height);
                    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0);
                    CGContextRef context = UIGraphicsGetCurrentContext();
                    CGContextSetShadowWithColor(context, CGSizeZero, 2.5f, [UIColor colorWithWhite:0.0f alpha:0.22f].CGColor);
                    CGContextSetLineWidth(context, 1.5f);
                    CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
                    CGContextStrokeEllipseInRect(context, CGRectInset(rect, insideInset + 0.5f, insideInset + 0.5f));
                    
                    backgroundImage = UIGraphicsGetImageFromCurrentImageContext();
                    UIGraphicsEndImageContext();
                }
                    break;
                    
                case TGCheckButtonStyleBar:
                {
                    CGRect rect = CGRectMake(0, 0, size.width, size.height);
                    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0);
                    CGContextRef context = UIGraphicsGetCurrentContext();
                    CGContextSetLineWidth(context, 1.0f);
                    CGContextSetStrokeColorWithColor(context, TGColorWithHex(0xcacacf).CGColor);
                    CGContextStrokeEllipseInRect(context, CGRectInset(rect, insideInset + 0.5f, insideInset + 0.5f));
                    
                    backgroundImage = UIGraphicsGetImageFromCurrentImageContext();
                    UIGraphicsEndImageContext();
                }
                    break;
                    
                default:
                {
                    CGRect rect = CGRectMake(0, 0, size.width, size.height);
                    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0);
                    CGContextRef context = UIGraphicsGetCurrentContext();
                    CGContextSetLineWidth(context, 1.0f);
                    CGContextSetStrokeColorWithColor(context, TGColorWithHex(0xcacacf).CGColor);
                    CGContextStrokeEllipseInRect(context, CGRectInset(rect, insideInset + 0.5f, insideInset + 0.5f));
                    
                    backgroundImage = UIGraphicsGetImageFromCurrentImageContext();
                    UIGraphicsEndImageContext();
                }
                    break;
            }
            
            backgroundImages[@(style)] = backgroundImage;
        }
        
        UIImage *fillImage = fillImages[@(style)];
        if (fillImage == nil)
        {
            CGRect rect = CGRectMake(0, 0, size.width, size.height);
            UIGraphicsBeginImageContextWithOptions(rect.size, false, 0);
            CGContextRef context = UIGraphicsGetCurrentContext();
            CGContextSetFillColorWithColor(context, TGColorWithHex(0x29c519).CGColor);
            CGContextFillEllipseInRect(context, CGRectInset(rect, insideInset, insideInset));
            
            fillImage = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            
            fillImages[@(style)] = fillImage;
        }
        
        _style = style;
        _size = size;
        _borderOnTop = borderOnTop;
        _fillImage = fillImage;
        
        _wrapperView = [[UIView alloc] initWithFrame:self.bounds];
        _wrapperView.userInteractionEnabled = false;
        [self addSubview:_wrapperView];
        
        _checkBackground = [[CALayer alloc] init];
        _checkBackground.contents = (__bridge id)(backgroundImage.CGImage);
        _checkBackground.frame = CGRectMake(0.0f, 0.0f, size.width, size.height);
        
        [_wrapperView.layer addSublayer:_checkBackground];
    }
    return self;
}

- (void)_createCheckButtonDetailsIfNeeded
{
    if (_checkFillView != nil)
        return;
    
    if (_borderOnTop)
        [_checkBackground removeFromSuperlayer];
    
    _checkFillView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, _size.width, _size.height)];
    _checkFillView.alpha = 0.0f;
    _checkFillView.image = _fillImage;
    _checkFillView.transform = CGAffineTransformMakeScale(0.01f, 0.01f);
    [_wrapperView addSubview:_checkFillView];
    
    _checkView = [[UIView alloc] initWithFrame:CGRectInset(self.bounds, 4, 4)];
    _checkView.alpha = 0.0f;
    _checkView.userInteractionEnabled = false;
    _checkView.transform = TGCheckButtonDefaultTransform;
    [_wrapperView addSubview:_checkView];
    
    CGRect shortFragmentFrame = CGRectMake(6.5f, 8.5f, 1.5f, 6.0f);
    CGRect longFragmentFrame = CGRectMake(7.5f, 13.0f, 11.0f, 1.5f);
    
    if (_style == TGCheckButtonStyleGallery)
    {
        shortFragmentFrame = CGRectMake(9.0f, 12.5f, 2.0f, 8.0f);
        longFragmentFrame = CGRectMake(9.5f, 18.5f, 17.0f, 2.0f);
    }
    
    _checkShortFragment = [[UIView alloc] init];
    _checkShortFragment.backgroundColor = [UIColor whiteColor];
    _checkShortFragment.layer.anchorPoint = CGPointMake(0.5f, 0);
    _checkShortFragment.frame = shortFragmentFrame;
    _checkShortFragment.transform = CGAffineTransformMakeScale(1.0f, 0.0f);
    [_checkView addSubview:_checkShortFragment];
    
    _checkLongFragment = [[UIView alloc] init];
    _checkLongFragment.backgroundColor = [UIColor whiteColor];
    _checkLongFragment.layer.anchorPoint = CGPointMake(0, 0.5f);
    _checkLongFragment.frame = longFragmentFrame;
    _checkLongFragment.transform = CGAffineTransformMakeScale(0.0f, 1.0f);
    [_checkView addSubview:_checkLongFragment];
    
    if (_borderOnTop)
        [_wrapperView.layer addSublayer:_checkBackground];
}

- (void)setSelected:(bool)selected animated:(bool)animated
{
    [self setSelected:selected animated:animated bump:false];
}

- (void)setSelected:(bool)selected animated:(bool)animated bump:(bool)bump
{
    if (selected)
        [self _createCheckButtonDetailsIfNeeded];
    
    if (animated && bump)
        [self setWrapperScale:selected ? 0.77f : 0.87f animated:false];
    
    static dispatch_once_t onceToken;
    static bool inhibitAnimation = false;
    dispatch_once(&onceToken, ^
    {
        inhibitAnimation = ([[[UIDevice currentDevice] systemVersion] compare:@"7" options:NSNumericSearch] == NSOrderedAscending);
    });

    if (inhibitAnimation)
        animated = false;
    
    if (animated)
    {
        if (self.selected == selected)
            return;
        
        if (bump)
        {
            if (selected)
                _checkFillView.transform = CGAffineTransformIdentity;
        }
        else
        {
            if (selected)
                _checkFillView.transform = CGAffineTransformMakeScale(0.01f, 0.01f);
            else
                _checkFillView.transform = CGAffineTransformIdentity;
        }
        
        [UIView animateWithDuration:0.19f animations:^
        {
            _checkFillView.alpha = selected ? 1.0f : 0.0f;
            if (!bump || !selected)
                _checkFillView.transform = selected ? CGAffineTransformIdentity : CGAffineTransformMakeScale(0.01f, 0.01f);
        }];
        
        if (selected)
        {
            CGFloat duration = 0.4f;
            CGFloat damping = 0.35f;
            CGFloat initialVelocity = 0.8f;
            if (bump)
            {
                duration = 0.5f;
                damping = 0.4f;
                initialVelocity = 0.6f;
            }
            
            [UIView animateWithDuration:duration delay:0.0f usingSpringWithDamping:damping initialSpringVelocity:initialVelocity options:UIViewAnimationOptionBeginFromCurrentState animations:^
            {
                _wrapperView.transform = CGAffineTransformIdentity;
            } completion:nil];
            
            _checkView.alpha = 1.0f;
            _checkShortFragment.transform = CGAffineTransformMakeScale(1.0f, 0.0f);
            _checkLongFragment.transform = CGAffineTransformMakeScale(0.0f, 1.0f);
            
            [UIView animateKeyframesWithDuration:0.21f delay:0.0f options:kNilOptions animations:^
            {
                [UIView addKeyframeWithRelativeStartTime:0.0f relativeDuration:0.333f animations:^
                {
                    _checkShortFragment.transform = CGAffineTransformIdentity;
                }];
                
                [UIView addKeyframeWithRelativeStartTime:0.333f relativeDuration:0.666f animations:^
                {
                    _checkLongFragment.transform = CGAffineTransformIdentity;
                }];
            } completion:nil];
        }
        else
        {
            CGFloat duration = 0.17f;
            if (bump)
                duration = 0.15f;
            
            [UIView animateWithDuration:duration animations:^
            {
                _checkView.transform = CGAffineTransformScale(_checkView.transform, 0.01f, 0.01f);
                _checkView.alpha = 0.0f;
                
                if (bump)
                    _wrapperView.transform = CGAffineTransformIdentity;
            } completion:^(__unused BOOL finished)
            {
                _checkView.transform = TGCheckButtonDefaultTransform;
            }];
        }
    }
    else
    {
        _checkFillView.alpha = selected ? 1.0f : 0.0f;
        _checkFillView.transform = selected ? CGAffineTransformIdentity : CGAffineTransformMakeScale(0.1f, 0.1f);

        _checkView.alpha = selected ? 1.0f : 0.0f;
        _checkView.transform = TGCheckButtonDefaultTransform;
        _checkShortFragment.transform = CGAffineTransformIdentity;
        _checkLongFragment.transform = CGAffineTransformIdentity;
    }
    
    super.selected = selected;
}

#pragma mark -

- (void)setWrapperScale:(CGFloat)scale animated:(bool)animated
{
    void (^change)(void) = ^
    {
        _wrapperView.transform = CGAffineTransformMakeScale(scale, scale);
    };
    
    if (animated)
        [UIView animateWithDuration:0.12 delay:0 options:UIViewAnimationOptionAllowAnimatedContent animations:change completion:nil];
    else
        change();
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];
    [self setWrapperScale:0.85f animated:true];
}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [super touchesEnded:touches withEvent:event];
    [self setWrapperScale:1.0f animated:true];
}

- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [super touchesCancelled:touches withEvent:event];
    [self setWrapperScale:1.0f animated:true];
}

@end