import 'dart:async';
import 'dart:io';

import 'package:http/http.dart' as http;

import '../api_error.dart';
import '../marianumcloud/talk/talk_error.dart';
import '../webuntis/webuntis_error.dart';
import 'app_exception.dart';
import 'network_exception.dart';
import 'parse_exception.dart';
import 'talk_exception.dart';
import 'webuntis_exception.dart';

const String _defaultFallback = 'Etwas ist schiefgelaufen. Bitte versuche es erneut.';

String errorToUserMessage(Object? error, {String fallback = _defaultFallback}) {
  if (error == null) return fallback;
  if (error is AppException) return error.userMessage;

  if (error is TalkError) return TalkException(error).userMessage;
  if (error is WebuntisError) return WebuntisException(error).userMessage;

  if (error is SocketException) {
    return const NetworkException().userMessage;
  }
  if (error is TimeoutException) {
    return NetworkException.timeout().userMessage;
  }
  if (error is http.ClientException) {
    return const NetworkException().userMessage;
  }
  if (error is HandshakeException) {
    return 'Sichere Verbindung konnte nicht hergestellt werden.';
  }
  if (error is FormatException) {
    return const ParseException().userMessage;
  }
  if (error is ApiError) {
    return _stripDioPrefix(error.message);
  }

  return fallback;
}

String? errorToTechnicalDetails(Object? error) {
  if (error == null) return null;
  if (error is AppException) return error.technicalDetails ?? error.toString();
  if (error is TalkError) return TalkException(error).technicalDetails;
  if (error is WebuntisError) return WebuntisException(error).technicalDetails;
  return error.toString();
}

bool errorAllowsRetry(Object? error) {
  if (error == null) return true;
  if (error is AppException) return error.allowRetry;
  return true;
}

String _stripDioPrefix(String raw) {
  // ApiError messages embed full request URIs; only surface the first line.
  final firstLine = raw.split('\n').first.trim();
  return firstLine.isEmpty ? _defaultFallback : firstLine;
}