Add files via upload

filcnaplo_kreta_api/lib/providers/homework_provider.dart

@@ -0,0 +1,65 @@
+import 'package:filcnaplo/api/providers/user_provider.dart';
+import 'package:filcnaplo/api/providers/database_provider.dart';
+import 'package:filcnaplo/models/user.dart';
+import 'package:filcnaplo_kreta_api/client/api.dart';
+import 'package:filcnaplo_kreta_api/client/client.dart';
+import 'package:filcnaplo_kreta_api/models/homework.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class HomeworkProvider with ChangeNotifier {
+  late List<Homework> _homework;
+  late BuildContext _context;
+  List<Homework> get homework => _homework;
+
+  HomeworkProvider({
+    List<Homework> initialHomework = const [],
+    required BuildContext context,
+  }) {
+    _homework = List.castFrom(initialHomework);
+    _context = context;
+
+    if (_homework.isEmpty) restore();
+  }
+
+  Future<void> restore() async {
+    String? userId = Provider.of<UserProvider>(_context, listen: false).id;
+
+    // Load homework from the database
+    if (userId != null) {
+      var dbHomework = await Provider.of<DatabaseProvider>(_context, listen: false).userQuery.getHomework(userId: userId);
+      _homework = dbHomework;
+      notifyListeners();
+    }
+  }
+
+  // Fetches Homework from the Kreta API then stores them in the database
+  Future<void> fetch({DateTime? from, bool db = true}) async {
+    User? user = Provider.of<UserProvider>(_context, listen: false).user;
+    if (user == null) throw "Cannot fetch Homework for User null";
+
+    String iss = user.instituteCode;
+    List? homeworkJson = await Provider.of<KretaClient>(_context, listen: false).getAPI(KretaAPI.homework(iss, start: from));
+    if (homeworkJson == null) throw "Cannot fetch Homework for User ${user.id}";
+
+    List<Homework> homework = [];
+    await Future.forEach(homeworkJson.cast<Map>(), (Map hw) async {
+      Map? e = await Provider.of<KretaClient>(_context, listen: false).getAPI(KretaAPI.homework(iss, id: hw["Uid"]));
+      if (e != null) homework.add(Homework.fromJson(e));
+    });
+    
+    if (homework.isEmpty && _homework.isEmpty) return;
+
+    if (db) await store(homework);
+    _homework = homework;
+    notifyListeners();
+  }
+
+  // Stores Homework in the database
+  Future<void> store(List<Homework> homework) async {
+    User? user = Provider.of<UserProvider>(_context, listen: false).user;
+    if (user == null) throw "Cannot store Homework for User null";
+    String userId = user.id;
+    await Provider.of<DatabaseProvider>(_context, listen: false).userStore.storeHomework(homework, userId: userId);
+  }
+}