/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Custom `SKNode` based button.

 */

#import "AAPLButton.h"

@interface AAPLButton ()

@property (strong, nonatomic) SKLabelNode *label;

@property (strong, nonatomic) SKSpriteNode *background;

@property (nonatomic, readonly) SEL actionClicked;

@property (nonatomic, readonly, weak) id targetClicked;

@property (nonatomic) CGSize size;

@end

@implementation AAPLButton

+ (AAPLButton*)buttonWithText:(NSString*)txt

{

    AAPLButton *button = [[AAPLButton alloc] initWithText:txt];

    return button;

}

+ (AAPLButton*)buttonWithSKNode:(SKNode*)node

{

    AAPLButton *button = [[AAPLButton alloc] initWithSKNode:node];

    return button;

}

- (id)initWithText:(NSString*)txt

{

    if (self = [super init])

    {

        // create a label

        NSString *fontName = @"Optima-ExtraBlack";

        _label = [SKLabelNode labelNodeWithFontNamed:fontName];

        _label.text = txt;

        _label.fontSize = 18;

        _label.fontColor = [SKColor whiteColor];

        _label.position = CGPointMake(0., -8.);

        // create the background

        _size = CGSizeMake(_label.frame.size.width + 10., 30.);

        _background = [SKSpriteNode spriteNodeWithColor:[SKColor colorWithRed:0 green:0 blue:0 alpha:0.75] size:_size ];

        // add to the root node

        [self addChild:_background];

        [self addChild:_label];

        // Track mouse event

        self.userInteractionEnabled = YES;        

    }

    return self;

}

- (id)initWithSKNode:(SKNode *)node

{

    if (self = [super init])

    {

        // Track mouse event

        self.userInteractionEnabled = YES;

        _size = node.frame.size;

        [self addChild:node];

    }

    return self;

}

- (CGFloat) width

{

    return _size.width;

}

- (CGFloat) height

{

    return _size.height;

}

- (void)setText:(NSString*)txt

{

    _label.text = txt;

}

- (void)setBackgroundColor:(SKColor*)col

{

    [_background setColor:col];

}

- (void)setClickedTarget:(id)target action:(SEL)action

{

    assert( target != nil && action != nil );

    _targetClicked = target;

    _actionClicked = action;

    IMP imp = [_targetClicked methodForSelector:action];

    assert( imp != nil );

    _action = (void *)imp;

}

#if TARGET_OS_OSX

- (void)mouseDown:(NSEvent *)event

{

    [self setBackgroundColor:[SKColor colorWithRed:0 green:0 blue:0 alpha:1.0]];

}

- (void)mouseUp:(NSEvent *)event

{

    [self setBackgroundColor:[SKColor colorWithRed:0 green:0 blue:0 alpha:0.75]];

    CGPoint pos = [self.scene convertPoint:self.position fromNode:self.parent];

    CGPoint p = [event locationInWindow];

    if( fabs(p.x-pos.x) < self.width/2*self.xScale && fabs(p.y-pos.y) < self.height/2*self.yScale )

        _action( _targetClicked, _actionClicked );

}

#endif

#if TARGET_OS_IPHONE

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

{

    _action( _targetClicked, _actionClicked );

}

#endif

@end