//
//  KBImagePositionButton.m
//  keyBoard
//
//  Created by Kiro on 2026/1/27.
//

#import "KBImagePositionButton.h"

@implementation KBImagePositionButton

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self setupDefault];
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)coder {
    if (self = [super initWithCoder:coder]) {
        [self setupDefault];
    }
    return self;
}

- (instancetype)initWithImagePosition:(KBImagePosition)imagePosition spacing:(CGFloat)spacing {
    if (self = [super initWithFrame:CGRectZero]) {
        _imagePosition = imagePosition;
        _spacing = spacing;
        [self setupDefault];
    }
    return self;
}

- (void)setupDefault {
    // 关键修复：不要判断 _imagePosition == 0，因为 KBImagePositionTop 的值就是 0
    // 如果是通过 initWithFrame 或 initWithCoder 初始化，_imagePosition 默认就是 0 (KBImagePositionTop)
    // 只有通过 initWithImagePosition 初始化时，才会明确设置 _imagePosition
    
    // 为非自定义初始化设置默认值
    if (self.spacing == 0) {
        _spacing = 8;
    }
    
    [self updateEdgeInsets];
}

#pragma mark - Setter

- (void)setImagePosition:(KBImagePosition)imagePosition {
    _imagePosition = imagePosition;
    [self updateEdgeInsets];
    [self setNeedsLayout];
}

- (void)setSpacing:(CGFloat)spacing {
    _spacing = spacing;
    [self updateEdgeInsets];
    [self setNeedsLayout];
}

- (void)setImage:(UIImage *)image forState:(UIControlState)state {
    [super setImage:image forState:state];
    // 延迟更新，确保 image 已经设置好
    dispatch_async(dispatch_get_main_queue(), ^{
        [self updateEdgeInsets];
    });
}

- (void)setTitle:(NSString *)title forState:(UIControlState)state {
    [super setTitle:title forState:state];
    // 延迟更新，确保 title 已经设置好
    dispatch_async(dispatch_get_main_queue(), ^{
        [self updateEdgeInsets];
    });
}

#pragma mark - EdgeInsets

- (void)updateEdgeInsets {
    CGSize imageSize = self.currentImage.size;
    CGSize titleSize = CGSizeZero;
    
    if (self.currentTitle.length > 0 && self.titleLabel.font) {
        NSDictionary *attributes = @{NSFontAttributeName: self.titleLabel.font};
        titleSize = [self.currentTitle sizeWithAttributes:attributes];
    }
    
    switch (self.imagePosition) {
        case KBImagePositionTop: {
            // 图片在上，文字在下
            self.imageEdgeInsets = UIEdgeInsetsMake(
                -(titleSize.height + self.spacing), // top: 向上移动
                0,                                   // left
                0,                                   // bottom
                -titleSize.width                     // right: 向左移动文字的宽度
            );
            
            self.titleEdgeInsets = UIEdgeInsetsMake(
                imageSize.height + self.spacing,    // top: 向下移动
                -imageSize.width,                    // left: 向左移动图片的宽度
                0,                                   // bottom
                0                                    // right
            );
            break;
        }
            
        case KBImagePositionBottom: {
            // 图片在下，文字在上
            self.imageEdgeInsets = UIEdgeInsetsMake(
                titleSize.height + self.spacing,    // top: 向下移动
                0,                                   // left
                0,                                   // bottom
                -titleSize.width                     // right
            );
            
            self.titleEdgeInsets = UIEdgeInsetsMake(
                -(imageSize.height + self.spacing), // top: 向上移动
                -imageSize.width,                    // left
                0,                                   // bottom
                0                                    // right
            );
            break;
        }
            
        case KBImagePositionLeft: {
            // 图片在左，文字在右（默认）
            self.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, self.spacing);
            self.titleEdgeInsets = UIEdgeInsetsMake(0, self.spacing, 0, 0);
            break;
        }
            
        case KBImagePositionRight: {
            // 图片在右，文字在左
            self.imageEdgeInsets = UIEdgeInsetsMake(
                0,
                titleSize.width + self.spacing,
                0,
                -(titleSize.width + self.spacing)
            );
            
            self.titleEdgeInsets = UIEdgeInsetsMake(
                0,
                -(imageSize.width + self.spacing),
                0,
                imageSize.width + self.spacing
            );
            break;
        }
    }
    NSLog(@"imageEdgeInsets: %@", NSStringFromUIEdgeInsets(self.imageEdgeInsets));
    NSLog(@"titleEdgeInsets: %@", NSStringFromUIEdgeInsets(self.titleEdgeInsets));
}

- (CGSize)intrinsicContentSize {
    CGSize imageSize = self.currentImage ? self.currentImage.size : CGSizeZero;
    CGSize titleSize = CGSizeZero;
    
    if (self.currentTitle.length > 0 && self.titleLabel.font) {
        NSDictionary *attributes = @{NSFontAttributeName: self.titleLabel.font};
        titleSize = [self.currentTitle sizeWithAttributes:attributes];
    }
    
    CGSize size = CGSizeZero;
    
    switch (self.imagePosition) {
        case KBImagePositionTop:
        case KBImagePositionBottom: {
            // 垂直排列
            size.width = MAX(imageSize.width, titleSize.width);
            size.height = imageSize.height + self.spacing + titleSize.height;
            break;
        }
            
        case KBImagePositionLeft:
        case KBImagePositionRight: {
            // 水平排列
            size.width = imageSize.width + self.spacing + titleSize.width;
            size.height = MAX(imageSize.height, titleSize.height);
            break;
        }
    }
    
    return size;
}

@end