import 'dart:developer' as developer;

/// 日志级别
enum LogLevel {
  debug,
  info,
  warning,
  error,
}

/// 日志工具类
/// 
/// 提供统一的日志记录接口，方便后续扩展和管理
class Logger {
  /// 当前日志级别，低于此级别的日志不会被输出
  static LogLevel _currentLevel = LogLevel.debug;
  
  /// 设置日志级别
  static void setLevel(LogLevel level) {
    _currentLevel = level;
  }
  
  /// 输出调试日志
  static void debug(String message, {String? tag}) {
    if (_currentLevel.index <= LogLevel.debug.index) {
      _log('DEBUG', message, tag: tag);
    }
  }
  
  /// 输出信息日志
  static void info(String message, {String? tag}) {
    if (_currentLevel.index <= LogLevel.info.index) {
      _log('INFO', message, tag: tag);
    }
  }
  
  /// 输出警告日志
  static void warning(String message, {String? tag}) {
    if (_currentLevel.index <= LogLevel.warning.index) {
      _log('WARNING', message, tag: tag);
    }
  }
  
  /// 输出错误日志
  static void error(String message, [dynamic error, StackTrace? stackTrace, String? tag]) {
    if (_currentLevel.index <= LogLevel.error.index) {
      _log('ERROR', message, tag: tag);
      if (error != null) {
        _log('ERROR', 'Original error: $error', tag: tag);
      }
      if (stackTrace != null) {
        _log('ERROR', 'Stack trace: $stackTrace', tag: tag);
      }
    }
  }
  
  /// 获取当前调用栈的类名
  static String? _getCallerClassName() {
    try {
      final stackTrace = StackTrace.current.toString();
      final frames = stackTrace.split('\n');
      
      // 查找调用者帧 (跳过Logger框架内部的帧)
      for (int i = 0; i < frames.length; i++) {
        final frame = frames[i].trim();
        if (frame.contains('Logger.') || frame.contains('_log')) {
          continue;
        }
        
        // 简单的解析类名
        final regex = RegExp(r'#\d+\s+([^\.]+)\.([^\.]+)\s');
        final match = regex.firstMatch(frame);
        if (match != null && match.groupCount >= 1) {
          return match.group(1);
        }
        break;
      }
    } catch (e) {
      // 忽略解析错误
    }
    return null;
  }
  
  /// 内部日志输出方法
  static void _log(String level, String message, {String? tag}) {
    final timestamp = DateTime.now().toString();
    final className = tag ?? _getCallerClassName() ?? '';
    final tagInfo = className.isNotEmpty ? '[$className] ' : '';
    developer.log('[$timestamp][$level][$tagInfo]: $message');
  }
}