//
//  KBKeyboardMaskView.m
//  keyBoard
//
//  Created by Mac on 2025/11/27.
//

#import "KBKeyboardMaskView.h"
#import <AVFoundation/AVFoundation.h>

@interface KBKeyboardMaskView ()
@property (nonatomic, strong) UIButton *backButton;
@property (nonatomic, strong) UIView *videoContainerView;      // 承载引导视频的容器，复用原 GIF 尺寸逻辑
@property (nonatomic, strong) AVPlayer *kb_maskPlayer;         // 键盘蒙层引导视频播放器
@property (nonatomic, strong) AVPlayerLayer *kb_maskPlayerLayer;
@property (nonatomic, strong) UIImageView *tipLabel;           // 顶部提示图
@property (nonatomic, assign) CGFloat keyboardHeight;
@end

@implementation KBKeyboardMaskView
static const CGFloat KGifViewH = (209);

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (!self) return nil;
    self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];
    self.userInteractionEnabled = YES;

    // 返回按钮
    _backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *backImg = [UIImage imageNamed:@"close_white2_icon"];
    [_backButton setImage:backImg forState:UIControlStateNormal];
    [self addSubview:_backButton];

    [_backButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self).offset(9);
            make.top.equalTo(self.mas_safeAreaLayoutGuideTop).offset(4);
    
        make.width.height.mas_equalTo(40);
    }];

    // 视频区域（尺寸与原 GIF 一致）
    _videoContainerView = [UIView new];
    _videoContainerView.backgroundColor = [UIColor clearColor];
    _videoContainerView.clipsToBounds = YES;
    _videoContainerView.layer.cornerRadius = 30.0;
    _videoContainerView.layer.masksToBounds = YES;
    [self addSubview:_videoContainerView];

    [_videoContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self);
        make.width.mas_equalTo(KBFit(316));
        make.height.mas_equalTo(KBFit(KGifViewH));
        // 竖直方向不在这里约束，由 layoutSubviews 手动布局
    }];

    // 顶部提示图
    _tipLabel = [UIImageView new];
    _tipLabel.image = [UIImage imageNamed:@"mask_top_title"];
    _tipLabel.contentMode = UIViewContentModeScaleAspectFit;
    [self addSubview:_tipLabel];

    // 整个蒙层点击：激活输入框
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTapMask:)];
    [self addGestureRecognizer:tap];

    // 监听 App 前后台，保证从后台返回时视频能继续播放
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(kb_maskAppDidBecomeActive:)
                                                 name:UIApplicationDidBecomeActiveNotification
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(kb_maskAppDidEnterBackground:)
                                                 name:UIApplicationDidEnterBackgroundNotification
                                               object:nil];

    // 初始化并开始播放引导视频（循环）
    [self kb_setupGuideVideoPlayerIfNeeded];

    return self;
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)layoutSubviews {
    [super layoutSubviews];

    // 根据键盘高度，保证视频不被遮挡：
    // - 无键盘：居中显示；
    // - 有键盘：底部距离键盘上方 20pt，若空间不足则向上顶到顶部预留的 safe 区域。
    CGFloat viewH = CGRectGetHeight(self.bounds);
    CGFloat gifH = KBFit(KGifViewH);
    CGFloat topMargin = 80.0; // 预留给返回按钮和标题等
    CGFloat bottomMargin = 20.0;

    CGFloat y = 0;
    if (self.keyboardHeight <= 0) {
        // 无键盘：垂直居中
        y = (viewH - gifH) * 0.5;
        if (y < topMargin) y = topMargin;
    } else {
        CGFloat maxBottom = viewH - self.keyboardHeight - bottomMargin;
        y = maxBottom - gifH;
        if (y < topMargin) y = topMargin;
    }

    CGRect gifFrame = self.videoContainerView.frame;
    gifFrame.origin.y = y;
    self.videoContainerView.frame = gifFrame;

    // 布局顶部提示图：底部距离视频容器顶部 20pt，居中显示
    CGFloat labelMaxWidth = CGRectGetWidth(self.bounds) - 40.0; // 左右各留 20
    if (labelMaxWidth < 0) { labelMaxWidth = 0; }
    UIImage *tipImage = self.tipLabel.image;
    if (!tipImage) { return; }
    CGFloat imgW = tipImage.size.width;
    CGFloat imgH = tipImage.size.height;
    if (imgW <= 0 || imgH <= 0) { return; }
    CGFloat scale = 1.0;
    if (imgW > labelMaxWidth && labelMaxWidth > 0) {
        scale = labelMaxWidth / imgW;
    }
    CGFloat labelW = imgW * scale;
    CGFloat labelH = imgH * scale;

    CGFloat labelX = (CGRectGetWidth(self.bounds) - labelW) * 0.5;
    CGFloat labelBottom = CGRectGetMinY(self.videoContainerView.frame) - 20.0;
    CGFloat labelY = labelBottom - labelH;
    self.tipLabel.frame = CGRectMake(labelX, labelY, labelW, labelH);

    // 使播放器图层铺满容器
    if (self.kb_maskPlayerLayer) {
        self.kb_maskPlayerLayer.frame = self.videoContainerView.bounds;
    }
}

- (void)setHidden:(BOOL)hidden {
    [super setHidden:hidden];
    if (hidden) {
        [self.kb_maskPlayer pause];
    } else {
        [self.kb_maskPlayer play];
    }
}

- (void)onTapMask:(UITapGestureRecognizer *)gr {
    CGPoint p = [gr locationInView:self];
    // 如果点在返回按钮区域内，则不走 tapHandler（交由按钮自己的事件处理）
    if (CGRectContainsPoint(self.backButton.frame, p)) {
        return;
    }
    if (self.tapHandler) {
        self.tapHandler();
    }
}

- (void)updateForKeyboardHeight:(CGFloat)kbHeight
                       duration:(NSTimeInterval)duration
                          curve:(UIViewAnimationOptions)curve {
    self.keyboardHeight = MAX(kbHeight, 0);
    // 触发布局刷新，以便在 layoutSubviews 里根据最新键盘高度重算视频容器的 Y 值
    [self setNeedsLayout];
    [UIView animateWithDuration:duration
                          delay:0
                        options:curve
                     animations:^{
                         [self layoutIfNeeded];
                     }
                     completion:nil];
}

#pragma mark - App Lifecycle

- (void)kb_maskAppDidBecomeActive:(NSNotification *)note {
    // 仅在当前蒙层真正显示在窗口上时恢复播放
    if (self.window && !self.hidden) {
        if (!self.kb_maskPlayer) {
            [self kb_setupGuideVideoPlayerIfNeeded];
        } else {
            [self.kb_maskPlayer play];
        }
    }
}

- (void)kb_maskAppDidEnterBackground:(NSNotification *)note {
    [self.kb_maskPlayer pause];
}

#pragma mark - Video

- (void)kb_setupGuideVideoPlayerIfNeeded {
    if (self.kb_maskPlayer) { return; }

    NSURL *videoURL = [[NSBundle mainBundle] URLForResource:@"permiss_video_2" withExtension:@"mp4"];
    if (!videoURL) { return; }

    AVPlayerItem *item = [AVPlayerItem playerItemWithURL:videoURL];
    self.kb_maskPlayer = [AVPlayer playerWithPlayerItem:item];
    self.kb_maskPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

    self.kb_maskPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:self.kb_maskPlayer];
    self.kb_maskPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
    self.kb_maskPlayerLayer.cornerRadius = 30.0;
    self.kb_maskPlayerLayer.masksToBounds = YES;
    [self.videoContainerView.layer addSublayer:self.kb_maskPlayerLayer];

    // 循环播放
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(kb_maskPlayerDidReachEnd:)
                                                 name:AVPlayerItemDidPlayToEndTimeNotification
                                               object:item];

    [self.kb_maskPlayer play];
}

- (void)kb_maskPlayerDidReachEnd:(NSNotification *)note {
    AVPlayerItem *item = (AVPlayerItem *)note.object;
    if (!item) return;
    __weak typeof(self) weakSelf = self;
    [item seekToTime:kCMTimeZero completionHandler:^(BOOL finished) {
        __strong typeof(weakSelf) strongSelf = weakSelf;
        [strongSelf.kb_maskPlayer play];
    }];
}

@end