//
//  KBChatAssistantCell.m
//  CustomKeyboard
//
//  AI 消息 Cell（左侧显示，带语音按钮和打字机效果）
//

#import "KBChatAssistantCell.h"
#import "KBChatMessage.h"
#import "Masonry.h"

@interface KBChatAssistantCell ()

@property (nonatomic, strong) UIButton *voiceButton;
@property (nonatomic, strong) UILabel *durationLabel;
@property (nonatomic, strong) UIView *bubbleView;
@property (nonatomic, strong) UILabel *messageLabel;
@property (nonatomic, strong) UIActivityIndicatorView *voiceLoadingIndicator;
@property (nonatomic, strong) UIActivityIndicatorView *messageLoadingIndicator;
@property (nonatomic, strong) KBChatMessage *currentMessage;

/// 打字机效果
@property (nonatomic, strong) NSTimer *typewriterTimer;
@property (nonatomic, copy) NSString *fullText;
@property (nonatomic, assign) NSInteger currentCharIndex;

@end

@implementation KBChatAssistantCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style
              reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        self.contentView.backgroundColor = [UIColor clearColor];
        self.selectionStyle = UITableViewCellSelectionStyleNone;
        [self setupUI];
    }
    return self;
}

- (void)setupUI {
    [self.contentView addSubview:self.voiceButton];
    [self.contentView addSubview:self.durationLabel];
    [self.contentView addSubview:self.voiceLoadingIndicator];
    [self.contentView addSubview:self.messageLoadingIndicator];
    [self.contentView addSubview:self.bubbleView];
    [self.bubbleView addSubview:self.messageLabel];
    
    // 语音按钮
    [self.voiceButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.contentView).offset(12);
        make.top.equalTo(self.contentView).offset(6);
        make.width.height.mas_equalTo(20);
    }];
    
    // 语音时长
    [self.durationLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.voiceButton.mas_right).offset(4);
        make.centerY.equalTo(self.voiceButton);
    }];
    
    // 语音加载指示器
    [self.voiceLoadingIndicator mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.equalTo(self.voiceButton);
    }];
    
    // 消息加载指示器
    [self.messageLoadingIndicator mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.contentView).offset(12);
        make.top.equalTo(self.voiceButton.mas_bottom).offset(8);
    }];
    
    // 气泡
    [self.bubbleView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.voiceButton.mas_bottom).offset(4);
        make.bottom.equalTo(self.contentView).offset(-4);
        make.left.equalTo(self.contentView).offset(12);
        make.width.lessThanOrEqualTo(self.contentView).multipliedBy(0.7);
    }];
    
    // 消息文本
    [self.messageLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.bubbleView).offset(8);
        make.bottom.equalTo(self.bubbleView).offset(-8);
        make.left.equalTo(self.bubbleView).offset(12);
        make.right.equalTo(self.bubbleView).offset(-12);
        make.height.greaterThanOrEqualTo(@18);
    }];
}

- (void)configureWithMessage:(KBChatMessage *)message {
    NSLog(@"[KBChatAssistantCell] ========== configureWithMessage ==========");
    NSLog(@"[KBChatAssistantCell] text: %@", message.text);
    NSLog(@"[KBChatAssistantCell] outgoing: %d, isLoading: %d, isComplete: %d, needsTypewriter: %d", 
          message.outgoing, message.isLoading, message.isComplete, message.needsTypewriterEffect);
    
    // 先停止之前的打字机效果
    [self stopTypewriterEffect];
    
    self.currentMessage = message;
    
    // 处理 loading 状态
    if (message.isLoading) {
        NSLog(@"[KBChatAssistantCell] 显示 loading 状态");
        self.messageLabel.attributedText = nil;
        self.messageLabel.text = @"";
        self.bubbleView.hidden = YES;
        self.voiceButton.hidden = YES;
        self.durationLabel.hidden = YES;
        [self.messageLoadingIndicator startAnimating];
        return;
    }
    
    // 非 loading 状态
    [self.messageLoadingIndicator stopAnimating];
    self.bubbleView.hidden = NO;
    
    // 语音按钮显示逻辑
    BOOL hasAudio = (message.audioId.length > 0) || (message.audioData.length > 0);
    self.voiceButton.hidden = !hasAudio;
    self.durationLabel.hidden = !hasAudio;
    NSLog(@"[KBChatAssistantCell] hasAudio: %d, audioId: %@", hasAudio, message.audioId);
    
    // 语音时长
    if (message.audioDuration > 0) {
        NSInteger seconds = (NSInteger)ceil(message.audioDuration);
        self.durationLabel.text = [NSString stringWithFormat:@"%ld\"", (long)seconds];
    } else {
        self.durationLabel.text = @"";
    }
    
    // 打字机效果
    if (message.needsTypewriterEffect && !message.isComplete && message.text.length > 0) {
        NSLog(@"[KBChatAssistantCell] ✅ 启动打字机效果");
        [self startTypewriterEffectWithText:message.text];
    } else {
        NSLog(@"[KBChatAssistantCell] 直接显示文本（不使用打字机）");
        self.messageLabel.attributedText = nil;
        self.messageLabel.text = message.text ?: @"";
    }
}

#pragma mark - Typewriter Effect

- (void)startTypewriterEffectWithText:(NSString *)text {
    if (text.length == 0) return;
    
    self.fullText = text;
    self.currentCharIndex = 0;
    
    // 先设置完整文本让布局计算正确高度
    self.messageLabel.text = text;
    [self.contentView setNeedsLayout];
    [self.contentView layoutIfNeeded];
    
    // 应用打字机效果
    dispatch_async(dispatch_get_main_queue(), ^{
        NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
        [attributedText addAttribute:NSForegroundColorAttributeName
                               value:[UIColor clearColor]
                               range:NSMakeRange(0, text.length)];
        [attributedText addAttribute:NSFontAttributeName
                               value:self.messageLabel.font
                               range:NSMakeRange(0, text.length)];
        self.messageLabel.attributedText = attributedText;
        
        self.typewriterTimer = [NSTimer scheduledTimerWithTimeInterval:0.03
                                                                target:self
                                                              selector:@selector(typewriterTick)
                                                              userInfo:nil
                                                               repeats:YES];
        [[NSRunLoop currentRunLoop] addTimer:self.typewriterTimer forMode:NSRunLoopCommonModes];
        [self typewriterTick];
    });
}

- (void)typewriterTick {
    NSString *text = self.fullText;
    if (!text || text.length == 0) {
        [self stopTypewriterEffect];
        return;
    }
    
    if (self.currentCharIndex < text.length) {
        self.currentCharIndex++;
        
        NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
        UIColor *textColor = [UIColor whiteColor];
        
        if (self.currentCharIndex > 0) {
            [attributedText addAttribute:NSForegroundColorAttributeName
                                   value:textColor
                                   range:NSMakeRange(0, self.currentCharIndex)];
        }
        if (self.currentCharIndex < text.length) {
            [attributedText addAttribute:NSForegroundColorAttributeName
                                   value:[UIColor clearColor]
                                   range:NSMakeRange(self.currentCharIndex, text.length - self.currentCharIndex)];
        }
        [attributedText addAttribute:NSFontAttributeName
                               value:self.messageLabel.font
                               range:NSMakeRange(0, text.length)];
        
        self.messageLabel.attributedText = attributedText;
    } else {
        [self stopTypewriterEffect];
        
        // 显示完整文本
        NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
        [attributedText addAttribute:NSForegroundColorAttributeName
                               value:[UIColor whiteColor]
                               range:NSMakeRange(0, text.length)];
        [attributedText addAttribute:NSFontAttributeName
                               value:self.messageLabel.font
                               range:NSMakeRange(0, text.length)];
        self.messageLabel.attributedText = attributedText;
        
        // 标记完成
        if (self.currentMessage) {
            self.currentMessage.isComplete = YES;
            self.currentMessage.needsTypewriterEffect = NO;
        }
    }
}

- (void)stopTypewriterEffect {
    if (self.typewriterTimer && self.typewriterTimer.isValid) {
        [self.typewriterTimer invalidate];
    }
    self.typewriterTimer = nil;
    self.currentCharIndex = 0;
    self.fullText = nil;
}

#pragma mark - Voice Button

- (void)updateVoicePlayingState:(BOOL)isPlaying {
    UIImage *icon = nil;
    if (@available(iOS 13.0, *)) {
        icon = isPlaying ? [UIImage systemImageNamed:@"pause.circle.fill"] : [UIImage systemImageNamed:@"play.circle.fill"];
    }
    [self.voiceButton setImage:icon forState:UIControlStateNormal];
}

- (void)showVoiceLoadingAnimation {
    [self.voiceButton setImage:nil forState:UIControlStateNormal];
    [self.voiceLoadingIndicator startAnimating];
}

- (void)hideVoiceLoadingAnimation {
    [self.voiceLoadingIndicator stopAnimating];
    UIImage *icon = nil;
    if (@available(iOS 13.0, *)) {
        icon = [UIImage systemImageNamed:@"play.circle.fill"];
    }
    [self.voiceButton setImage:icon forState:UIControlStateNormal];
}

- (void)voiceButtonTapped {
    if ([self.delegate respondsToSelector:@selector(assistantCell:didTapVoiceButtonForMessage:)]) {
        [self.delegate assistantCell:self didTapVoiceButtonForMessage:self.currentMessage];
    }
}

#pragma mark - Reuse

- (void)prepareForReuse {
    [super prepareForReuse];
    [self stopTypewriterEffect];
    self.messageLabel.text = @"";
    self.messageLabel.attributedText = nil;
    [self.messageLoadingIndicator stopAnimating];
    [self.voiceLoadingIndicator stopAnimating];
}

- (void)dealloc {
    [self stopTypewriterEffect];
}

#pragma mark - Lazy

- (UIButton *)voiceButton {
    if (!_voiceButton) {
        _voiceButton = [UIButton buttonWithType:UIButtonTypeCustom];
        UIImage *icon = nil;
        if (@available(iOS 13.0, *)) {
            icon = [UIImage systemImageNamed:@"play.circle.fill"];
        }
        [_voiceButton setImage:icon forState:UIControlStateNormal];
        _voiceButton.tintColor = [UIColor whiteColor];
        [_voiceButton addTarget:self action:@selector(voiceButtonTapped) forControlEvents:UIControlEventTouchUpInside];
    }
    return _voiceButton;
}

- (UILabel *)durationLabel {
    if (!_durationLabel) {
        _durationLabel = [[UILabel alloc] init];
        _durationLabel.font = [UIFont systemFontOfSize:11];
        _durationLabel.textColor = [UIColor whiteColor];
    }
    return _durationLabel;
}

- (UIActivityIndicatorView *)voiceLoadingIndicator {
    if (!_voiceLoadingIndicator) {
        _voiceLoadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleMedium];
        _voiceLoadingIndicator.color = [UIColor whiteColor];
        _voiceLoadingIndicator.hidesWhenStopped = YES;
    }
    return _voiceLoadingIndicator;
}

- (UIActivityIndicatorView *)messageLoadingIndicator {
    if (!_messageLoadingIndicator) {
        _messageLoadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleMedium];
        _messageLoadingIndicator.color = [UIColor whiteColor];
        _messageLoadingIndicator.hidesWhenStopped = YES;
    }
    return _messageLoadingIndicator;
}

- (UIView *)bubbleView {
    if (!_bubbleView) {
        _bubbleView = [[UIView alloc] init];
        _bubbleView.backgroundColor = [UIColor colorWithRed:0.2 green:0.2 blue:0.2 alpha:0.7];
        _bubbleView.layer.cornerRadius = 12;
        _bubbleView.layer.masksToBounds = YES;
    }
    return _bubbleView;
}

- (UILabel *)messageLabel {
    if (!_messageLabel) {
        _messageLabel = [[UILabel alloc] init];
        _messageLabel.numberOfLines = 0;
        _messageLabel.font = [UIFont systemFontOfSize:14];
        _messageLabel.textColor = [UIColor whiteColor];
        _messageLabel.lineBreakMode = NSLineBreakByWordWrapping;
    }
    return _messageLabel;
}

@end