//
//  KBKeyButton.m
//  CustomKeyboard
//

#import "KBKeyButton.h"
#import "KBKey.h"
#import "KBSkinManager.h"

@interface KBKeyButton ()
@property (nonatomic, strong) UIImageView *iconView;
@end

@implementation KBKeyButton

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

- (void)applyDefaultStyle {
    self.titleLabel.font = [UIFont systemFontOfSize:18 weight:UIFontWeightSemibold];
    KBSkinTheme *t = [KBSkinManager shared].current;
    [self setTitleColor:t.keyTextColor forState:UIControlStateNormal];
    [self setTitleColor:t.keyTextColor forState:UIControlStateHighlighted];
    self.backgroundColor = t.keyBackground;
    self.layer.cornerRadius = 6.0;      // 圆角
    self.layer.masksToBounds = NO;
    self.layer.shadowColor = [UIColor colorWithWhite:0 alpha:0.1].CGColor; // 阴影效果
    self.layer.shadowOpacity = 1.0;
    self.layer.shadowOffset = CGSizeMake(0, 1);
    self.layer.shadowRadius = 1.5;
    [self refreshStateAppearance];

    // 懒创建图标视图，用于后续皮肤按键小图标展示
    if (!self.iconView) {
        UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectZero];
        // 作为按键的整块皮肤背景，铺满整个按钮区域
        iv.contentMode = UIViewContentModeScaleAspectFill;
        iv.clipsToBounds = YES;
        iv.translatesAutoresizingMaskIntoConstraints = NO;
        [self addSubview:iv];
        // 让皮肤图片撑满整个按钮
        [NSLayoutConstraint activateConstraints:@[
            [iv.topAnchor constraintEqualToAnchor:self.topAnchor],
            [iv.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
            [iv.leadingAnchor constraintEqualToAnchor:self.leadingAnchor],
            [iv.trailingAnchor constraintEqualToAnchor:self.trailingAnchor],
        ]];
        self.iconView = iv;

        // 文字保持居中；若需要显示文字，则覆盖在皮肤图片之上
        self.titleEdgeInsets = UIEdgeInsetsZero;
        [self bringSubviewToFront:self.titleLabel];
    }
}

- (void)setKey:(KBKey *)key {
    _key = key;
    // 每次切换按键模型时，根据皮肤刷新一次图标和文字显隐
    [self applyThemeForCurrentKey];
}

- (void)setHighlighted:(BOOL)highlighted {
    [super setHighlighted:highlighted];
    // 简单按压反馈：选中态不改变透明度，避免和高亮态冲突
    if (self.isSelected) {
        self.alpha = 1.0;
    } else {
        self.alpha = highlighted ? 0.2 : 1.0;
    }
}

- (void)setSelected:(BOOL)selected {
    [super setSelected:selected];
    [self refreshStateAppearance];
}

- (void)refreshStateAppearance {
    // 选中态用于 Shift/CapsLock 等特殊按键的高亮显示
    KBSkinTheme *t = [KBSkinManager shared].current;
    if (self.isSelected) {
        self.backgroundColor = t.keyHighlightBackground ?: t.keyBackground;
    } else {
        self.backgroundColor = t.keyBackground;
    }
}

- (void)applyThemeForCurrentKey {
    // 依据皮肤决定是否显示文字
    NSString *identifier = self.key.identifier;
    BOOL hideText = [[KBSkinManager shared] shouldHideKeyTextForIdentifier:identifier];
    self.titleLabel.hidden = hideText;

    // 根据皮肤映射加载图标（若有），支持大小写变体：
    // - identifier: 逻辑按键标识（如 letter_q）
    // - caseVariant: 0/1/2 => 无变体/小写/大写
    NSInteger variant = (NSInteger)self.key.caseVariant;
    UIImage *iconImg = [[KBSkinManager shared] iconImageForKeyIdentifier:identifier caseVariant:variant];
    self.iconView.image = iconImg;
    self.iconView.hidden = (iconImg == nil);
}

@end