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filcnaplo_kreta_api/lib/providers/absence_provider.dart

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+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/absence.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class AbsenceProvider with ChangeNotifier {
+  late List<Absence> _absences;
+  late BuildContext _context;
+  List<Absence> get absences => _absences;
+
+  AbsenceProvider({
+    List<Absence> initialAbsences = const [],
+    required BuildContext context,
+  }) {
+    _absences = List.castFrom(initialAbsences);
+    _context = context;
+
+    if (_absences.isEmpty) restore();
+  }
+
+  Future<void> restore() async {
+    String? userId = Provider.of<UserProvider>(_context, listen: false).id;
+
+    // Load absences from the database
+    if (userId != null) {
+      var dbAbsences = await Provider.of<DatabaseProvider>(_context, listen: false).userQuery.getAbsences(userId: userId);
+      _absences = dbAbsences;
+      await convertBySettings();
+    }
+  }
+
+  // for renamed subjects
+  Future<void> convertBySettings() async {
+    final _database = Provider.of<DatabaseProvider>(_context, listen: false);
+    Map<String, String> renamedSubjects = (await _database.query.getSettings(_database)).renamedSubjectsEnabled
+        ? await _database.userQuery.renamedSubjects(userId: Provider.of<UserProvider>(_context, listen: false).user!.id)
+        : {};
+
+    for (Absence absence in _absences) {
+      absence.subject.renamedTo = renamedSubjects.isNotEmpty ? renamedSubjects[absence.subject.id] : null;
+    }
+
+    notifyListeners();
+  }
+
+  // Fetches Absences from the Kreta API then stores them in the database
+  Future<void> fetch() async {
+    User? user = Provider.of<UserProvider>(_context, listen: false).user;
+    if (user == null) throw "Cannot fetch Absences for User null";
+    String iss = user.instituteCode;
+
+    List? absencesJson = await Provider.of<KretaClient>(_context, listen: false).getAPI(KretaAPI.absences(iss));
+    if (absencesJson == null) throw "Cannot fetch Absences for User ${user.id}";
+    List<Absence> absences = absencesJson.map((e) => Absence.fromJson(e)).toList();
+
+    if (absences.isNotEmpty || _absences.isNotEmpty) await store(absences);
+  }
+
+  // Stores Absences in the database
+  Future<void> store(List<Absence> absences) async {
+    User? user = Provider.of<UserProvider>(_context, listen: false).user;
+    if (user == null) throw "Cannot store Absences for User null";
+    String userId = user.id;
+
+    await Provider.of<DatabaseProvider>(_context, listen: false).userStore.storeAbsences(absences, userId: userId);
+    _absences = absences;
+    await convertBySettings();
+  }
+}