import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../../config/emoji_config.dart';

/// 表情文本组件 - 用于在消息中显示文本和表情的混合内容
class EmojiTextWidget extends StatelessWidget {
  final String text;
  final TextStyle? textStyle;
  final double? emojiSize;

  const EmojiTextWidget({
    super.key,
    required this.text,
    this.textStyle,
    this.emojiSize,
  });

  @override
  Widget build(BuildContext context) {
    return Wrap(
      crossAxisAlignment: WrapCrossAlignment.center,
      children: _parseMessageContent(),
    );
  }

  /// 解析消息内容，将文本和表情混合显示
  List<Widget> _parseMessageContent() {
    final List<Widget> widgets = [];
    final RegExp emojiRegex = RegExp(r'\[emoji:(\d+)\]');
    
    int lastMatchEnd = 0;
    final matches = emojiRegex.allMatches(text);

    for (final match in matches) {
      // 添加表情之前的文本
      if (match.start > lastMatchEnd) {
        final textPart = text.substring(lastMatchEnd, match.start);
        widgets.add(
          Text(
            textPart,
            style: textStyle,
          ),
        );
      }

      // 添加表情图片
      final emojiId = match.group(1);
      if (emojiId != null) {
        final emoji = EmojiConfig.getEmojiById(emojiId);
        if (emoji != null) {
          widgets.add(
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 2.w),
              child: Image.asset(
                emoji.path,
                width: emojiSize ?? 24.w,
                height: emojiSize ?? 24.w,
                fit: BoxFit.contain,
              ),
            ),
          );
        } else {
          // 如果表情不存在，显示原始文本
          widgets.add(
            Text(
              match.group(0)!,
              style: textStyle,
            ),
          );
        }
      }

      lastMatchEnd = match.end;
    }

    // 添加剩余的文本
    if (lastMatchEnd < text.length) {
      final textPart = text.substring(lastMatchEnd);
      widgets.add(
        Text(
          textPart,
          style: textStyle,
        ),
      );
    }

    return widgets;
  }
}

/// 表情文本工具类
class EmojiTextHelper {
  /// 检查消息是否包含表情
  static bool containsEmoji(String text) {
    return RegExp(r'\[emoji:\d+\]').hasMatch(text);
  }

  /// 获取消息中的所有表情ID
  static List<String> getEmojiIds(String text) {
    final RegExp emojiRegex = RegExp(r'\[emoji:(\d+)\]');
    final matches = emojiRegex.allMatches(text);
    return matches.map((match) => match.group(1)!).toList();
  }

  /// 将表情替换为表情名称（用于预览或搜索）
  static String replaceEmojiWithName(String text) {
    final RegExp emojiRegex = RegExp(r'\[emoji:(\d+)\]');
    return text.replaceAllMapped(emojiRegex, (match) {
      final emojiId = match.group(1);
      if (emojiId != null) {
        final emoji = EmojiConfig.getEmojiById(emojiId);
        if (emoji != null) {
          return '[${emoji.name}]';
        }
      }
      return match.group(0)!;
    });
  }

  /// 检查是否为纯表情消息（只包含一个表情，没有其他文字）
  static bool isPureEmoji(String text) {
    final trimmed = text.trim();
    final RegExp pureEmojiRegex = RegExp(r'^\[emoji:\d+\]$');
    return pureEmojiRegex.hasMatch(trimmed);
  }
}