enum LogLevel { debug, info, warning, error }

class LogEntry {
  final DateTime timestamp;
  final LogLevel level;
  final String message;
  final String module;
  final String? funcName;
  final int? lineNo;
  final String? errorType;
  final String? errorMessage;
  final String? stackTrace;
  final Map<String, dynamic>? extra;

  LogEntry({
    required this.timestamp,
    required this.level,
    required this.message,
    required this.module,
    this.funcName,
    this.lineNo,
    this.errorType,
    this.errorMessage,
    this.stackTrace,
    this.extra,
  });

  Map<String, dynamic> toJson() => {
    'timestamp': timestamp.toIso8601String(),
    'level': level.name,
    'message': message,
    'module': module,
    if (funcName != null) 'func_name': funcName,
    if (lineNo != null) 'line_no': lineNo,
    if (errorType != null) 'error_type': errorType,
    if (errorMessage != null) 'error_message': errorMessage,
    if (stackTrace != null) 'stack_trace': stackTrace,
    if (extra != null && extra!.isNotEmpty) 'extra': extra,
  };

  String toConsoleString() {
    final ts = timestamp.toIso8601String();
    final location = [
      if (funcName != null) funcName,
      if (lineNo != null) '@$lineNo',
    ].join('');
    final locationStr = location.isNotEmpty ? ' [$location]' : '';
    final errorStr = errorType != null ? ' [$errorType]' : '';
    final errorMsgStr = errorMessage != null ? ' $errorMessage' : '';
    final extraStr = extra != null && extra!.isNotEmpty ? ' $extra' : '';
    return '$ts ${level.name.toUpperCase().padRight(7)} [$module$locationStr]$errorStr $message$errorMsgStr$extraStr';
  }

  String toFileString() {
    final sb = StringBuffer();
    sb.writeln('[$timestamp] ${level.name.toUpperCase()} [$module]');
    if (funcName != null || lineNo != null) {
      sb.write('  at ${funcName ?? ''}');
      if (lineNo != null) sb.write(':$lineNo');
      sb.writeln();
    }
    sb.writeln('  $message');
    if (errorType != null) {
      sb.writeln('  Error: $errorType');
    }
    if (errorMessage != null) {
      sb.writeln('  ErrorMessage: $errorMessage');
    }
    if (stackTrace != null) {
      sb.writeln('  StackTrace:');
      sb.writeln(stackTrace);
    }
    if (extra != null && extra!.isNotEmpty) {
      sb.writeln('  Extra: $extra');
    }
    return sb.toString();
  }
}