//
//  UIButton+QX.m
//  QXLive
//
//  Created by 启星 on 2025/4/28.
//

#import "UIButton+QX.h"

@implementation UIButton (QX)
- (void)qx_layoutButtonWithEdgeInsetsStyle:(QXButtonEdgeInsetsStyle)style
                        imageTitleSpace:(CGFloat)space{
    [self sizeToFit];
    [self qx_layoutButtonNOSizeToFitWithEdgeInsetsStyle:style imageTitleSpace:space];
}

- (void)qx_layoutButtonNOSizeToFitWithEdgeInsetsStyle:(QXButtonEdgeInsetsStyle)style
                                   imageTitleSpace:(CGFloat)space {
    /**
     * 前置知识点：titleEdgeInsets是title相对于其上下左右的inset，跟tableView的contentInset是类似的，
     * 如果只有title，那它的上下左右都是相对于button的，image也是一样；
     * 如果同时有image和label，那这时候image的上左下是相对于button，右边是相对于label的；title的上右下是相对于button，左边是相对于image的。
     */
    
    CGFloat spacef = ceilf(space);
    
    
    // 1.得到imageView和titleLabel的宽、高
    CGFloat imageWidth = self.imageView.frame.size.width;
    CGFloat imageHeight = self.imageView.frame.size.height;
    
    CGFloat labelWidth = 0.0;
    CGFloat labelHeight = 0.0;
    if (@available(iOS 8.0, *)) {
        // 由于iOS8中titleLabel的size为0，用下面的设置
        labelWidth = self.titleLabel.intrinsicContentSize.width;
        labelHeight = self.titleLabel.intrinsicContentSize.height;
    }else {
        labelWidth = self.titleLabel.frame.size.width;
        labelHeight = self.titleLabel.frame.size.height;
    }
    
    // 2.声明全局的imageEdgeInsets和labelEdgeInsets
    UIEdgeInsets imageEdgeInsets = UIEdgeInsetsZero;
    UIEdgeInsets labelEdgeInsets = UIEdgeInsetsZero;
    UIEdgeInsets contentEdgeInsets = UIEdgeInsetsZero;
    
    CGFloat imageOffSetX = labelWidth / 2.0;
    CGFloat labelOffSetX = imageWidth / 2.0;
    
    CGFloat maxWidth = MAX(imageWidth,labelWidth); // 上下排布宽度肯定变小 获取最大宽度的那个
    CGFloat changeWidth = imageWidth + labelWidth - maxWidth; // 横向缩小的总宽度
    CGFloat maxHeight = MAX(imageHeight,labelHeight); // 获取最大高度那个 （就是水平默认排布的时候的原始高度）
    
    // 3.根据style和spacef得到imageEdgeInsets和labelEdgeInsets的值
    switch (style) {
        case QXButtonEdgeInsetsStyleTop:
            {
                CGFloat gap = (maxHeight - MIN(imageHeight, labelHeight))/2.0;
                if (imageHeight >= labelHeight) {
                    imageEdgeInsets = UIEdgeInsetsMake(0, imageOffSetX, 0, -imageOffSetX);
                    labelEdgeInsets = UIEdgeInsetsMake(labelHeight + gap + spacef, -labelOffSetX, -(labelHeight + gap + spacef), labelOffSetX);
                    contentEdgeInsets = UIEdgeInsetsMake(0, - changeWidth / 2.0, spacef + labelHeight, -changeWidth / 2.0);
                }else{
                    imageEdgeInsets = UIEdgeInsetsMake(-(gap + imageHeight + spacef), imageOffSetX, gap + imageHeight + spacef, -imageOffSetX);
                    labelEdgeInsets = UIEdgeInsetsMake(0, -labelOffSetX, 0, labelOffSetX);
                    contentEdgeInsets = UIEdgeInsetsMake(spacef + imageHeight, - changeWidth / 2.0, 0, -changeWidth / 2.0);
                }
            }
            break;
        case QXButtonEdgeInsetsStyleLeft:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, -spacef/2.0, 0, spacef/2.0);
            labelEdgeInsets = UIEdgeInsetsMake(0, spacef/2.0, 0, -spacef/2.0);
            contentEdgeInsets = UIEdgeInsetsMake(0, spacef/2.0, 0, spacef/2.0);
        }
            break;
        case QXButtonEdgeInsetsStyleBottom:
        {
            CGFloat gap = (maxHeight - MIN(imageHeight, labelHeight))/2.0;
            if (imageHeight >= labelHeight) {
                imageEdgeInsets = UIEdgeInsetsMake(0,
                                                   imageOffSetX,
                                                   0,
                                                   -imageOffSetX);
                labelEdgeInsets = UIEdgeInsetsMake(-(labelHeight + gap + spacef),
                                                   -labelOffSetX,
                                                   labelHeight + gap + spacef,
                                                   labelOffSetX);
                contentEdgeInsets = UIEdgeInsetsMake(spacef + labelHeight,
                                                     - changeWidth / 2.0,
                                                     0,
                                                     -changeWidth / 2.0);
            }else{
                imageEdgeInsets = UIEdgeInsetsMake(gap + imageHeight + spacef,
                                                   imageOffSetX,
                                                   -(gap + imageHeight + spacef),
                                                   -imageOffSetX);
                labelEdgeInsets = UIEdgeInsetsMake(0,
                                                   -labelOffSetX,
                                                   0,
                                                   labelOffSetX);
                contentEdgeInsets = UIEdgeInsetsMake(0,
                                                     - changeWidth / 2.0,
                                                     spacef + imageHeight,
                                                     -changeWidth / 2.0);
            }

        }
            break;
        case QXButtonEdgeInsetsStyleRight:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+spacef/2.0, 0, -labelWidth-spacef/2.0);
            labelEdgeInsets = UIEdgeInsetsMake(0, -imageWidth-spacef/2.0, 0, imageWidth+spacef/2.0);
            contentEdgeInsets = UIEdgeInsetsMake(0, spacef/2.0, 0, spacef/2.0);
        }
            break;
        default:
            break;
    }
    
    // 4.赋值
    self.titleEdgeInsets = labelEdgeInsets;
    self.imageEdgeInsets = imageEdgeInsets;
    self.contentEdgeInsets = contentEdgeInsets;
}
@end