//
//  KBChatMessageCell.m
//  CustomKeyboard
//

#import "KBChatMessageCell.h"
#import "KBChatMessage.h"
#import "Masonry.h"

@interface KBChatMessageCell ()

@property (nonatomic, strong) UIImageView *avatarView;
@property (nonatomic, strong) UILabel *nameLabel;
@property (nonatomic, strong) UIView *bubbleView;
@property (nonatomic, strong) UILabel *messageLabel;
@property (nonatomic, strong) UIImageView *audioIconView;
@property (nonatomic, strong) UILabel *audioLabel;

/// 语音播放按钮
@property (nonatomic, strong) UIButton *voiceButton;
/// 语音时长标签
@property (nonatomic, strong) UILabel *durationLabel;
/// 语音加载指示器
@property (nonatomic, strong) UIActivityIndicatorView *voiceLoadingIndicator;
/// 消息加载指示器（AI 回复 loading）
@property (nonatomic, strong) UIActivityIndicatorView *messageLoadingIndicator;

/// 当前消息
@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 KBChatMessageCell

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

        [self.contentView addSubview:self.avatarView];
        [self.contentView addSubview:self.nameLabel];
        [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];
        [self.bubbleView addSubview:self.audioIconView];
        [self.bubbleView addSubview:self.audioLabel];
    }
    return self;
}

- (void)kb_configureWithMessage:(KBChatMessage *)message {
    // 先停止之前的打字机效果
    [self kb_stopTypewriterEffect];
    
    self.currentMessage = message;
    
    BOOL outgoing = message.outgoing;
    BOOL audioMessage = (!outgoing && message.audioFilePath.length > 0);
    UIColor *bubbleColor = outgoing ? [UIColor colorWithHex:0x02BEAC] : [UIColor colorWithWhite:1 alpha:0.95];
    UIColor *incomingTextColor =
        [UIColor kb_dynamicColorWithLightColor:[UIColor colorWithHex:0x1B1F1A]
                                     darkColor:[UIColor whiteColor]];
    UIColor *textColor = outgoing ? [UIColor whiteColor] : incomingTextColor;
    UIColor *nameColor =
        [UIColor kb_dynamicColorWithLightColor:[UIColor colorWithHex:0x6B6F7A]
                                     darkColor:[UIColor colorWithHex:0xC7CBD4]];

    self.bubbleView.backgroundColor = bubbleColor;
    self.messageLabel.textColor = textColor;
    self.audioLabel.textColor = textColor;
    self.audioIconView.tintColor = textColor;
    self.audioLabel.text =
        (message.text.length > 0) ? message.text : KBLocalized(@"语音回复");
    self.messageLabel.hidden = audioMessage;
    self.audioIconView.hidden = !audioMessage;
    self.audioLabel.hidden = !audioMessage;

    UIImage *avatarImage = message.avatarImage;
    if (!avatarImage) {
        avatarImage = [self kb_defaultAvatarImage];
    }
    self.avatarView.image = avatarImage;
    self.avatarView.backgroundColor =
        avatarImage ? [UIColor clearColor] : [UIColor colorWithWhite:0.9 alpha:1.0];
    self.nameLabel.hidden = outgoing;
    self.nameLabel.textColor = nameColor;
    self.nameLabel.text =
        (message.displayName.length > 0) ? message.displayName : KBLocalized(@"AI助手");

    // 处理 loading 状态
    if (message.isLoading && !outgoing) {
        self.bubbleView.hidden = YES;
        self.voiceButton.hidden = YES;
        self.durationLabel.hidden = YES;
        [self.messageLoadingIndicator startAnimating];
        [self kb_layoutForOutgoing:outgoing audioMessage:NO];
        return;
    }
    
    // 非 loading 状态
    [self.messageLoadingIndicator stopAnimating];
    self.bubbleView.hidden = NO;
    
    // 语音按钮显示逻辑（仅 AI 消息且有 audioId 或 audioData）
    BOOL hasAudio = (!outgoing) && (message.audioId.length > 0 || message.audioData.length > 0);
    self.voiceButton.hidden = !hasAudio;
    self.durationLabel.hidden = !hasAudio;
    if (hasAudio && 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 (!outgoing && message.needsTypewriterEffect && !message.isComplete && message.text.length > 0) {
        [self kb_startTypewriterEffectWithText:message.text];
    } else {
        self.messageLabel.attributedText = nil;
        self.messageLabel.text = message.text ?: @"";
    }

    [self kb_layoutForOutgoing:outgoing audioMessage:audioMessage];
}

- (void)kb_layoutForOutgoing:(BOOL)outgoing audioMessage:(BOOL)audioMessage {
    CGFloat avatarSize = 28.0;
    [self.avatarView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.width.height.mas_equalTo(avatarSize);
        make.top.equalTo(self.contentView.mas_top).offset(6);
        if (outgoing) {
            make.right.equalTo(self.contentView.mas_right).offset(-8);
        } else {
            make.left.equalTo(self.contentView.mas_left).offset(8);
        }
    }];

    if (outgoing) {
        [self.nameLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.contentView.mas_top).offset(0);
            make.left.equalTo(self.contentView.mas_left);
        }];
        // 用户消息不显示语音按钮
        [self.voiceButton mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.width.height.mas_equalTo(0);
            make.left.top.equalTo(self.contentView);
        }];
        [self.durationLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.width.height.mas_equalTo(0);
            make.left.top.equalTo(self.contentView);
        }];
    } else {
        [self.nameLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.avatarView.mas_right).offset(6);
            make.top.equalTo(self.contentView.mas_top).offset(2);
            make.right.lessThanOrEqualTo(self.contentView.mas_right).offset(-12);
        }];
        // AI 消息语音按钮
        [self.voiceButton mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.avatarView.mas_right).offset(6);
            make.top.equalTo(self.nameLabel.mas_bottom).offset(4);
            make.width.height.mas_equalTo(20);
        }];
        [self.durationLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.voiceButton.mas_right).offset(4);
            make.centerY.equalTo(self.voiceButton);
        }];
        [self.voiceLoadingIndicator mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.center.equalTo(self.voiceButton);
        }];
    }
    
    // 消息加载指示器
    [self.messageLoadingIndicator mas_remakeConstraints:^(MASConstraintMaker *make) {
        if (outgoing) {
            make.right.equalTo(self.avatarView.mas_left).offset(-10);
        } else {
            make.left.equalTo(self.avatarView.mas_right).offset(10);
        }
        make.top.equalTo(self.nameLabel.mas_bottom).offset(8);
    }];

    [self.bubbleView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.width.lessThanOrEqualTo(self.contentView.mas_width).multipliedBy(0.65);
        if (outgoing) {
            make.top.equalTo(self.contentView.mas_top).offset(6);
            make.bottom.equalTo(self.contentView.mas_bottom).offset(-6);
            make.right.equalTo(self.avatarView.mas_left).offset(-6);
        } else {
            // AI 消息：气泡在语音按钮下方
            make.top.equalTo(self.voiceButton.mas_bottom).offset(4);
            make.bottom.equalTo(self.contentView.mas_bottom).offset(-6);
            make.left.equalTo(self.avatarView.mas_right).offset(6);
            make.right.lessThanOrEqualTo(self.contentView.mas_right).offset(-12);
        }
    }];

    if (audioMessage) {
        [self.messageLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.width.height.mas_equalTo(0);
            make.left.equalTo(self.bubbleView.mas_left);
            make.top.equalTo(self.bubbleView.mas_top);
        }];
        [self.audioIconView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.bubbleView.mas_left).offset(10);
            make.centerY.equalTo(self.bubbleView);
            make.width.height.mas_equalTo(16);
        }];
        [self.audioLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.audioIconView.mas_right).offset(6);
            make.centerY.equalTo(self.bubbleView);
            make.right.equalTo(self.bubbleView.mas_right).offset(-10);
            make.top.greaterThanOrEqualTo(self.bubbleView.mas_top).offset(8);
            make.bottom.lessThanOrEqualTo(self.bubbleView.mas_bottom).offset(-8);
        }];
    } else {
        [self.audioIconView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.width.height.mas_equalTo(0);
            make.left.equalTo(self.bubbleView.mas_left);
            make.top.equalTo(self.bubbleView.mas_top);
        }];
        [self.audioLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.width.height.mas_equalTo(0);
            make.left.equalTo(self.audioIconView.mas_right);
            make.top.equalTo(self.bubbleView.mas_top);
        }];
        [self.messageLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.edges.equalTo(self.bubbleView).insets(UIEdgeInsetsMake(8, 10, 8, 10));
        }];
    }
}

#pragma mark - Typewriter Effect

- (void)kb_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(kb_typewriterTick)
                                                              userInfo:nil
                                                               repeats:YES];
        [[NSRunLoop currentRunLoop] addTimer:self.typewriterTimer forMode:NSRunLoopCommonModes];
        [self kb_typewriterTick];
    });
}

- (void)kb_typewriterTick {
    NSString *text = self.fullText;
    if (!text || text.length == 0) {
        [self kb_stopTypewriterEffect];
        return;
    }
    
    if (self.currentCharIndex < text.length) {
        self.currentCharIndex++;
        
        NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
        UIColor *textColor = self.messageLabel.textColor ?: [UIColor blackColor];
        
        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 kb_stopTypewriterEffect];
        
        // 显示完整文本
        NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
        UIColor *textColor = self.messageLabel.textColor ?: [UIColor blackColor];
        [attributedText addAttribute:NSForegroundColorAttributeName
                               value:textColor
                               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)kb_stopTypewriterEffect {
    if (self.typewriterTimer && self.typewriterTimer.isValid) {
        [self.typewriterTimer invalidate];
    }
    self.typewriterTimer = nil;
    self.currentCharIndex = 0;
    self.fullText = nil;
}

#pragma mark - Voice Button

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

- (void)kb_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)kb_onVoiceButtonTapped {
    if ([self.delegate respondsToSelector:@selector(chatMessageCell:didTapVoiceButtonForMessage:)]) {
        [self.delegate chatMessageCell:self didTapVoiceButtonForMessage:self.currentMessage];
    }
}

#pragma mark - Reuse

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

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

#pragma mark - Lazy

- (UIImageView *)avatarView {
    if (!_avatarView) {
        _avatarView = [[UIImageView alloc] init];
        _avatarView.contentMode = UIViewContentModeScaleAspectFill;
        _avatarView.layer.cornerRadius = 14;
        _avatarView.layer.masksToBounds = YES;
        _avatarView.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0];
        _avatarView.tintColor =
            [UIColor kb_dynamicColorWithLightColor:[UIColor colorWithHex:0xB9BDC8]
                                         darkColor:[UIColor colorWithHex:0x6B6F7A]];
    }
    return _avatarView;
}

- (UILabel *)nameLabel {
    if (!_nameLabel) {
        _nameLabel = [[UILabel alloc] init];
        _nameLabel.font = [UIFont systemFontOfSize:11];
        _nameLabel.textColor = [UIColor colorWithHex:0x6B6F7A];
        _nameLabel.numberOfLines = 1;
    }
    return _nameLabel;
}

- (UIView *)bubbleView {
    if (!_bubbleView) {
        _bubbleView = [[UIView alloc] init];
        _bubbleView.layer.cornerRadius = 12;
        _bubbleView.layer.masksToBounds = YES;
    }
    return _bubbleView;
}

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

- (UIImageView *)audioIconView {
    if (!_audioIconView) {
        _audioIconView = [[UIImageView alloc] init];
        _audioIconView.contentMode = UIViewContentModeScaleAspectFit;
        _audioIconView.tintColor = [UIColor colorWithHex:0x1B1F1A];
        UIImage *icon = nil;
        if (@available(iOS 13.0, *)) {
            icon = [UIImage systemImageNamed:@"waveform"];
        }
        _audioIconView.image = icon;
    }
    return _audioIconView;
}

- (UILabel *)audioLabel {
    if (!_audioLabel) {
        _audioLabel = [[UILabel alloc] init];
        _audioLabel.font = [UIFont systemFontOfSize:14 weight:UIFontWeightMedium];
        _audioLabel.numberOfLines = 1;
    }
    return _audioLabel;
}

- (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(kb_onVoiceButtonTapped) 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;
}

- (UIImage *)kb_defaultAvatarImage {
    if (@available(iOS 13.0, *)) {
        return [UIImage systemImageNamed:@"person.circle.fill"];
    }
    return nil;
}

@end