import 'package:flutter/material.dart';

class KtTextHighlightUtils {
  /// 高亮搜索结果（支持正则匹配）
  static TextSpan highlightSearchResult({
    required String text,
    required String searchTerm,
    TextStyle? normalStyle,
    TextStyle? highlightStyle,
    bool caseSensitive = false,
  }) {
    if (searchTerm.isEmpty ||
        !text.toLowerCase().contains(searchTerm.toLowerCase())) {
      return TextSpan(text: text, style: normalStyle);
    }

    final matches = RegExp(
      searchTerm,
      caseSensitive: caseSensitive,
    ).allMatches(text);

    final List<TextSpan> children = [];
    int lastEnd = 0;

    for (final match in matches) {
      // 添加匹配前的文本
      if (match.start > lastEnd) {
        children.add(
          TextSpan(
            text: text.substring(lastEnd, match.start),
            style: normalStyle,
          ),
        );
      }

      // 添加匹配的文本（高亮） - 修改为文本颜色区分
      children.add(
        TextSpan(
          text: text.substring(match.start, match.end),
          style:
              highlightStyle ??
              TextStyle(
                color: Colors.blue, // 默认使用蓝色文本
                fontWeight: FontWeight.bold,
              ),
        ),
      );

      lastEnd = match.end;
    }

    // 添加剩余的文本
    if (lastEnd < text.length) {
      children.add(TextSpan(text: text.substring(lastEnd), style: normalStyle));
    }

    return TextSpan(children: children);
  }

  /// 高亮文本（简单子字符串匹配）
  static TextSpan highlightText({
    required String text,
    required String keyword,
    Color highlightColor = Colors.blue, // 修改为文本颜色
    Color textColor = Colors.black,
    double fontSize = 16,
    FontWeight normalWeight = FontWeight.normal,
    FontWeight highlightWeight = FontWeight.bold,
    bool caseSensitive = false,
    String? fontFamily,
  }) {
    if (keyword.isEmpty) {
      return TextSpan(
        text: text,
        style: TextStyle(
          color: textColor,
          fontSize: fontSize,
          fontWeight: normalWeight,
        ),
      );
    }

    final String searchText = caseSensitive ? text : text.toLowerCase();
    final String searchKeyword = caseSensitive
        ? keyword
        : keyword.toLowerCase();

    if (!searchText.contains(searchKeyword)) {
      return TextSpan(
        text: text,
        style: TextStyle(
          color: textColor,
          fontSize: fontSize,
          fontWeight: normalWeight,
          fontFamily: fontFamily,
        ),
      );
    }

    final List<TextSpan> children = [];
    int startIndex = 0;

    while (startIndex < text.length) {
      final int matchIndex = searchText.indexOf(searchKeyword, startIndex);

      if (matchIndex == -1) {
        // 剩余文本无匹配，全部添加
        children.add(
          TextSpan(
            text: text.substring(startIndex),
            style: TextStyle(
              color: textColor,
              fontSize: fontSize,
              fontWeight: normalWeight,
              fontFamily: fontFamily,
            ),
          ),
        );
        break;
      }

      // 添加匹配前的文本
      if (matchIndex > startIndex) {
        children.add(
          TextSpan(
            text: text.substring(startIndex, matchIndex),
            style: TextStyle(
              color: textColor,
              fontSize: fontSize,
              fontWeight: normalWeight,
              fontFamily: fontFamily,
            ),
          ),
        );
      }

      // 添加匹配的文本（高亮） - 修改为文本颜色区分
      children.add(
        TextSpan(
          text: text.substring(matchIndex, matchIndex + keyword.length),
          style: TextStyle(
            color: highlightColor, // 使用指定的高亮文本颜色
            fontSize: fontSize,
            fontWeight: highlightWeight,
            fontFamily: fontFamily,
          ),
        ),
      );

      // 更新起始位置
      startIndex = matchIndex + keyword.length;
    }

    return TextSpan(children: children);
  }

  /// 高亮多个关键词
  static TextSpan highlightMultipleKeywords({
    required String text,
    required List<String> keywords,
    Color highlightColor = Colors.blue, // 修改为文本颜色
    Color textColor = Colors.black,
    double fontSize = 16,
    String? fontFamily,
  }) {
    if (keywords.isEmpty || text.isEmpty) {
      return TextSpan(
        text: text,
        style: TextStyle(
          color: textColor,
          fontSize: fontSize,
          fontFamily: fontFamily,
        ),
      );
    }

    // 创建一个包含所有关键词的正则表达式
    final regexPattern = keywords.map(RegExp.escape).join('|');
    final regex = RegExp(regexPattern, caseSensitive: false);

    final matches = regex.allMatches(text);
    if (matches.isEmpty) {
      return TextSpan(
        text: text,
        style: TextStyle(
          color: textColor,
          fontSize: fontSize,
          fontFamily: fontFamily,
        ),
      );
    }

    final List<TextSpan> children = [];
    int lastEnd = 0;

    for (final match in matches) {
      // 添加匹配前的文本
      if (match.start > lastEnd) {
        children.add(
          TextSpan(
            text: text.substring(lastEnd, match.start),
            style: TextStyle(
              color: textColor,
              fontSize: fontSize,
              fontFamily: fontFamily,
            ),
          ),
        );
      }

      // 添加匹配的文本（高亮） - 修改为文本颜色区分
      children.add(
        TextSpan(
          text: text.substring(match.start, match.end),
          style: TextStyle(
            color: highlightColor, // 使用指定的高亮文本颜色
            fontSize: fontSize,
            fontWeight: FontWeight.bold,
            fontFamily: fontFamily,
          ),
        ),
      );

      lastEnd = match.end;
    }

    // 添加剩余的文本
    if (lastEnd < text.length) {
      children.add(
        TextSpan(
          text: text.substring(lastEnd),
          style: TextStyle(
            color: textColor,
            fontSize: fontSize,
            fontFamily: fontFamily,
          ),
        ),
      );
    }

    return TextSpan(children: children);
  }
}