/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Support class for action buttons.

 */

#import "AAPLButtonOverlay.h"

@implementation AAPLButtonOverlay {

    UITouch* _trackingTouch;

    SKShapeNode* _inner;

    SKShapeNode* _background;

    SKLabelNode* _label;

}

- (instancetype)initWithText:(NSString*)text {

    self = [super init];

    if (self) {

        _size = CGSizeMake(40, 40);

        self.alpha = 0.7;

        self.userInteractionEnabled = YES;

        [self buildButtonWithText:text];

    }

    return self;

}

- (void)setSize:(CGSize)size {

    if (!CGSizeEqualToSize(_size, size)) {

        _size = size;

        [self updateForSizeChange];

    }

}

- (void)buildButtonWithText:(NSString*)text {

    CGRect backgroundRect = CGRectMake(0, 0, _size.width, _size.height);

    _background = [[SKShapeNode alloc] init];

    _background.path = CGPathCreateWithEllipseInRect(backgroundRect, NULL);

    _background.strokeColor = [SKColor blackColor];

    _background.lineWidth = 3.0;

    [self addChild:_background];

    CGRect innerSize = CGRectZero;

    innerSize.size = self.innerSize;

    _inner = [[SKShapeNode alloc] init];

    _inner.path = CGPathCreateWithEllipseInRect(innerSize, NULL);

    _inner.lineWidth = 1.0;

    _inner.fillColor = [SKColor whiteColor];

    _inner.strokeColor = [SKColor grayColor];

    [self addChild:_inner];

    _label = [[SKLabelNode alloc] init];

    _label.fontName = [UIFont boldSystemFontOfSize:24].fontName;

    _label.fontSize = 24;

    _label.fontColor = [SKColor blackColor];

    _label.verticalAlignmentMode = SKLabelVerticalAlignmentModeCenter;

    _label.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeCenter;

    _label.position = CGPointMake(_size.width / 2.0, _size.height / 2.0 + 1.0f);

    _label.text = text;

    [self addChild:_label];

}

- (void)updateForSizeChange {

    CGRect backgroundRect = CGRectMake(0, 0, _size.width, _size.height);

    _background.path = CGPathCreateWithEllipseInRect(backgroundRect, NULL);

    CGRect innerRect = CGRectMake(0, 0, _size.width / 3.0,  _size.height / 3.0);

    _inner.path = CGPathCreateWithEllipseInRect(innerRect, NULL);

    _label.position = CGPointMake(_size.width / 2.0 - _label.frame.size.width / 2.0, _size.height / 2.0 - _label.frame.size.height / 2.0);

}

- (CGSize)innerSize {

    return CGSizeMake(_size.width,  _size.height);

}

- (void)resetInteraction {

    _trackingTouch = nil;

    _inner.fillColor = [SKColor whiteColor];

    if ([self.delegate respondsToSelector:@selector(didPressButtonOverlay:)]) {

        [self.delegate didPressButtonOverlay:self];

    }

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event {

    _trackingTouch = [touches anyObject];

    _inner.fillColor = [SKColor blackColor];

    if ([self.delegate respondsToSelector:@selector(willPressButtonOverlay:)]) {

        [self.delegate willPressButtonOverlay:self];

    }

}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event {

    if ([touches containsObject:_trackingTouch]) {

        [self resetInteraction];

    }

}

- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event {

    if ([touches containsObject:_trackingTouch]) {

        [self resetInteraction];

    }

}

@end