//
//  UIButton+button.m
//  TTJF
//
//  Created by wbzhan on 2018/4/24.
//  Copyright © 2018年 TTJF. All rights reserved.
//

#import "UIButton+button.h"
#import <objc/runtime.h>

@interface UIButton()
 @property (nonatomic, assign) BOOL isIgnoreEvent;
@end

@implementation UIButton (button)
@dynamic hitTestEdgeInsets;

static const NSString *KEY_HIT_TEST_EDGE_INSETS = @"HitTestEdgeInsets";
static const char *UIControl_timeInterval = "UIControl_timeInterval";
static const char *UIControl_enventIsIgnoreEvent = "UIControl_enventIsIgnoreEvent";

-(instancetype)init{
    self = [super init];
    if (self) {
        self.adjustsImageWhenHighlighted = NO;
    }
    return self;
}
-(void)setHighlighted:(BOOL)highlighted{
    
    [super setHighlighted:NO];
}
// runtime 动态绑定 属性
- (void)setIsIgnoreEvent:(BOOL)isIgnoreEvent
{
    objc_setAssociatedObject(self, UIControl_enventIsIgnoreEvent, @(isIgnoreEvent), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)isIgnoreEvent{
    return [objc_getAssociatedObject(self, UIControl_enventIsIgnoreEvent) boolValue];
}

- (NSTimeInterval)timeInterval
{
    return [objc_getAssociatedObject(self, UIControl_timeInterval) doubleValue];
}

- (void)setTimeInterval:(NSTimeInterval)timeInterval
{
    objc_setAssociatedObject(self, UIControl_timeInterval, @(timeInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

+ (void)load
{
    // Method Swizzling
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        SEL selA = @selector(sendAction:to:forEvent:);
        SEL selB = @selector(after_sendAction:to:forEvent:);
        Method methodA = class_getInstanceMethod(self,selA);
        Method methodB = class_getInstanceMethod(self, selB);
        
        BOOL isAdd = class_addMethod(self, selA, method_getImplementation(methodB), method_getTypeEncoding(methodB));
        
        if (isAdd) {
            class_replaceMethod(self, selB, method_getImplementation(methodA), method_getTypeEncoding(methodA));
        }else{
            //添加失败了 说明本类中有methodB的实现，此时只需要将methodA和methodB的IMP互换一下即可。
            method_exchangeImplementations(methodA, methodB);
        }
    });
}

- (void)after_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event
{
    self.timeInterval = self.timeInterval == 0 ? defaultInterval : self.timeInterval;
    if (self.isIgnoreEvent){
        return;
    }else if (self.timeInterval > 0){
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(self.timeInterval * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [self setIsIgnoreEvent:NO];
        });
    }
    
    self.isIgnoreEvent = YES;
    // 这里看上去会陷入递归调用死循环，但在运行期此方法是和sendAction:to:forEvent:互换的，相当于执行sendAction:to:forEvent:方法，所以并不会陷入死循环。
    [self after_sendAction:action to:target forEvent:event];
}
#pragma mark --点击区域以及button按钮文字位置
- (void)setImagePosition:(ImagePosition)postion spacing:(CGFloat)spacing
{
//    [self setTitle:self.currentTitle forState:UIControlStateNormal];
//    [self setImage:self.currentImage forState:UIControlStateNormal];
    
    CGFloat imageWidth = self.imageView.image.size.width;
    CGFloat imageHeight = self.imageView.image.size.height;
    CGFloat labelWidth = [self.titleLabel.text sizeWithAttributes:@{NSFontAttributeName:self.titleLabel.font}].width;
    
    if (postion == ImagePositionRight && labelWidth >= self.frame.size.width - imageWidth) {
        labelWidth = self.frame.size.width - imageWidth;
    }
    
    CGFloat labelHeight = [self.titleLabel.text sizeWithAttributes:@{NSFontAttributeName:self.titleLabel.font}].height;
    
    CGFloat imageOffsetX = (imageWidth + labelWidth) / 2 - imageWidth / 2; //image中心移动的x距离
    CGFloat imageOffsetY = imageHeight / 2 + spacing / 2; //image中心移动的y距离
    CGFloat labelOffsetX = (imageWidth + labelWidth / 2) - (imageWidth + labelWidth) / 2; //label中心移动的x距离
    CGFloat labelOffsetY = labelHeight / 2 + spacing / 2; //label中心移动的y距离
    
    CGFloat tempWidth = MAX(labelWidth, imageWidth);
    CGFloat changedWidth = labelWidth + imageWidth - tempWidth;
    CGFloat tempHeight = MAX(labelHeight, imageHeight);
    CGFloat changedHeight = labelHeight + imageHeight + spacing - tempHeight;
    
    switch (postion) {
        case ImagePositionLeft:
            self.imageEdgeInsets = UIEdgeInsetsMake(0, -spacing / 2, 0, spacing / 2);
            self.titleEdgeInsets = UIEdgeInsetsMake(0, spacing / 2, 0, -spacing / 2);
            self.contentEdgeInsets = UIEdgeInsetsMake(0, spacing / 2, 0, spacing / 2);
            break;
            
        case ImagePositionRight:
            self.imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth + spacing / 2, 0, -(labelWidth + spacing / 2));
            self.titleEdgeInsets = UIEdgeInsetsMake(0, -(imageWidth + spacing / 2), 0, imageWidth + spacing / 2);
            self.contentEdgeInsets = UIEdgeInsetsMake(0, spacing / 2, 0, spacing / 2);
            break;
            
        case ImagePositionTop:
            self.imageEdgeInsets = UIEdgeInsetsMake(-imageOffsetY, imageOffsetX, imageOffsetY, -imageOffsetX);
            self.titleEdgeInsets = UIEdgeInsetsMake(labelOffsetY, -labelOffsetX, -labelOffsetY, labelOffsetX);
            self.contentEdgeInsets = UIEdgeInsetsMake(imageOffsetY, -changedWidth / 2, changedHeight - imageOffsetY, -changedWidth / 2);
            break;
            
        case ImagePositionBottom:
            self.imageEdgeInsets = UIEdgeInsetsMake(imageOffsetY, imageOffsetX, -imageOffsetY, -imageOffsetX);
            self.titleEdgeInsets = UIEdgeInsetsMake(-labelOffsetY, -labelOffsetX, labelOffsetY, labelOffsetX);
            self.contentEdgeInsets = UIEdgeInsetsMake(changedHeight - imageOffsetY, -changedWidth / 2, imageOffsetY, -changedWidth / 2);
            break;
            
        default:
            break;
    }
}

-(void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets
{
    NSValue *value = [NSValue value:&hitTestEdgeInsets withObjCType:@encode(UIEdgeInsets)];
    objc_setAssociatedObject(self, &KEY_HIT_TEST_EDGE_INSETS, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

-(UIEdgeInsets)hitTestEdgeInsets
{
    NSValue *value = objc_getAssociatedObject(self, &KEY_HIT_TEST_EDGE_INSETS);
    if(value) {
        UIEdgeInsets edgeInsets; [value getValue:&edgeInsets]; return edgeInsets;
    }else {
        return UIEdgeInsetsZero;
    }
}
//点击区域
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    if(UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero) || !self.enabled || self.hidden) {
        return [super pointInside:point withEvent:event];
    }
    
    CGRect relativeFrame = self.bounds;
    CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.hitTestEdgeInsets);
    
    return CGRectContainsPoint(hitFrame, point);
}
@end