fetch.dart

import 'dart:convert';

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

import '../fetching/pageconfig.dart';
import '../fetching/timetable.dart';
import '../util/date_extension.dart';
import '../util/serializable.dart';
import 'class.dart';
import 'element_type.dart';
import 'lecture.dart';

typedef Cookie = (String key, String value);

typedef RequestOptions = (String path, String method, Json params);
typedef RequestResult = (Json json, List<Cookie> cookies, FetchStats stats);

class UntisFetch {
  static const String apiBase = '/WebUntis/api/public';
  static const String idHsReutlingen = '_aHMgcmV1dGxpbmdlbg==';
  static const _sessionCookieNames = <String>{
    'JSESSIONID',
    'traceId',
  };

  final http.Client client = http.Client();
  final Uri serverHost = Uri.https('poly.webuntis.com');

  final List<Cookie> _sessionCookies = [];

  late PageConfig<Class> allClasses = PageConfig(
    this,
    elementType: ElementType.classGroup,
    convert: Class.new,
  );

  late PageConfig<Lecture> allLectures = PageConfig(
    this,
    elementType: ElementType.lecture,
    convert: Lecture.new,
  );

  final Map<TimetableOptions, CacheableTimetable> _timetables = {};

  CacheableTimetable timetableOf({
    required ElementType type,
    required int elementId,
    required DateTime date,
  }) {
    final startOfWeek = date.atStartOfWeek();
    final TimetableOptions options = (type, elementId, startOfWeek);
    return _timetables.putIfAbsent(
        options,
        () => CacheableTimetable(this,
            date: startOfWeek, type: type, elementId: elementId));
  }

  Uri _makeUri(RequestOptions options) {
    final (String path, _, Json params) = options;

    return serverHost.replace(
      path: '$apiBase/$path',
      queryParameters: params,
    );
  }

  Future<http.StreamedResponse> _request(String method, Uri uri) async {
    final request = http.Request(method, uri);