Fix exception when there are no more tuitions to pay

uni/lib/controller/background_workers/notifications/tuition_notification.dart

@@ -45,9 +45,12 @@ class TuitionNotification extends Notification {
         !(await AppSharedPreferences.getTuitionNotificationToggle());
     if (notificationsAreDisabled) return false;
     final FeesFetcher feesFetcher = FeesFetcher();
-    final String nextDueDate = await parseFeesNextLimit(
+    final DateTime? dueDate = await parseFeesNextLimit(
         await feesFetcher.getUserFeesResponse(session));
-    _dueDate = DateTime.parse(nextDueDate);
+
+    if(dueDate == null) return false;
+
+    _dueDate = dueDate;
     return DateTime.now().difference(_dueDate).inDays >= -3;
   }
 

uni/lib/controller/local_storage/app_user_database.dart

@@ -31,13 +31,14 @@ class AppUserDataDatabase extends AppDatabase {
     final List<Map<String, dynamic>> maps = await db.query('userdata');
 
     // Convert the List<Map<String, dynamic> into a Profile.
-    String? name, email, printBalance, feesBalance, feesLimit;
+    String? name, email, printBalance, feesBalance;
+    DateTime? feesLimit;
     for (Map<String, dynamic> entry in maps) {
       if (entry['key'] == 'name') name = entry['value'];
       if (entry['key'] == 'email') email = entry['value'];
       if (entry['key'] == 'printBalance') printBalance = entry['value'];
       if (entry['key'] == 'feesBalance') feesBalance = entry['value'];
-      if (entry['key'] == 'feesLimit') feesLimit = entry['value'];
+      if (entry['key'] == 'feesLimit') feesLimit = DateTime.tryParse(entry['value']);
     }
 
     return Profile(
@@ -46,7 +47,7 @@ class AppUserDataDatabase extends AppDatabase {
         courses: <Course>[],
         printBalance: printBalance ?? '?',
         feesBalance: feesBalance ?? '?',
-        feesLimit: feesLimit ?? '?');
+        feesLimit: feesLimit);
   }
 
   /// Deletes all of the data stored in this database.
@@ -65,13 +66,12 @@ class AppUserDataDatabase extends AppDatabase {
 
   /// Saves the user's balance and payment due date to the database.
   ///
-  /// *Note:*
-  /// * the first value in [feesInfo] is the user's balance.
-  /// * the second value in [feesInfo] is the user's payment due date.
-  void saveUserFees(Tuple2<String, String> feesInfo) async {
+  void saveUserFees(String feesBalance, DateTime? feesLimit) async {
     await insertInDatabase(
-        'userdata', {'key': 'feesBalance', 'value': feesInfo.item1});
-    await insertInDatabase(
-        'userdata', {'key': 'feesLimit', 'value': feesInfo.item2});
+        'userdata', {'key': 'feesBalance', 'value': feesBalance});
+    await insertInDatabase('userdata', {
+      'key': 'feesLimit',
+      'value': feesLimit != null ? feesLimit.toIso8601String() : ''
+    });
   }
 }

uni/lib/controller/parsers/parser_fees.dart

@@ -17,15 +17,17 @@ Future<String> parseFeesBalance(http.Response response) async {
 /// Extracts the user's payment due date from an HTTP [response].
 ///
 /// If there are no due payments, `Sem data` is returned.
-Future<String> parseFeesNextLimit(http.Response response) async {
+Future<DateTime?> parseFeesNextLimit(http.Response response) async {
   final document = parse(response.body);
 
   final lines = document.querySelectorAll('#tab0 .tabela tr');
 
   if (lines.length < 2) {
-    return 'Sem data';
+    return null;
   }
   final String limit = lines[1].querySelectorAll('.data')[1].text;
 
-  return limit;
+  //it's completly fine to throw an exeception if it fails, in this case, 
+  //since probably sigarra is returning something we don't except
+  return DateTime.parse(limit); 
 }

uni/lib/model/entities/profile.dart

@@ -10,15 +10,15 @@ class Profile {
   late List<Course> courses;
   final String printBalance;
   final String feesBalance;
-  final String feesLimit;
+  final DateTime? feesLimit;
 
   Profile(
       {this.name = '',
       this.email = '',
       courses,
       this.printBalance = '',
       this.feesBalance = '',
-      this.feesLimit = ''})
+      this.feesLimit})
       : courses = courses ?? [];
 
   /// Creates a new instance from a JSON object.

uni/lib/model/providers/profile_state_provider.dart

@@ -63,7 +63,7 @@ class ProfileStateProvider extends StateProviderNotifier {
       final response = await FeesFetcher().getUserFeesResponse(session);
 
       final String feesBalance = await parseFeesBalance(response);
-      final String feesLimit = await parseFeesNextLimit(response);
+      final DateTime? feesLimit = await parseFeesNextLimit(response);
 
       final DateTime currentTime = DateTime.now();
       final Tuple2<String, String> userPersistentInfo =
@@ -73,7 +73,7 @@ class ProfileStateProvider extends StateProviderNotifier {
 
         // Store fees info
         final profileDb = AppUserDataDatabase();
-        profileDb.saveUserFees(Tuple2<String, String>(feesBalance, feesLimit));
+        profileDb.saveUserFees(feesBalance, feesLimit);
       }
 
       final Profile newProfile = Profile(

uni/lib/view/profile/widgets/account_info_card.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 import 'package:uni/model/entities/reference.dart';
 import 'package:uni/model/providers/profile_state_provider.dart';
@@ -50,37 +51,34 @@ class AccountInfoCard extends GenericCard {
                   Container(
                       margin: const EdgeInsets.only(
                           top: 8.0, bottom: 20.0, right: 30.0),
-                      child: getInfoText(profile.feesLimit, context))
+                      child: getInfoText(
+                          profile.feesLimit != null
+                              ? DateFormat('yyyy-MM-dd')
+                                  .format(profile.feesLimit!)
+                              : 'Sem data',
+                          context))
                 ]),
                 TableRow(children: [
                   Container(
-                    margin:
-                        const EdgeInsets.only(top: 8.0, bottom: 20.0, left: 20.0),
-                    child: Text("Notificar próxima data limite: ",
-                      style: Theme.of(context).textTheme.titleSmall)
-                  ),
+                      margin: const EdgeInsets.only(
+                          top: 8.0, bottom: 20.0, left: 20.0),
+                      child: Text("Notificar próxima data limite: ",
+                          style: Theme.of(context).textTheme.titleSmall)),
                   Container(
-                    margin:
-                        const EdgeInsets.only(top: 8.0, bottom: 20.0, left: 20.0),
-                    child: 
-                      const TuitionNotificationSwitch()
-                  )
+                      margin: const EdgeInsets.only(
+                          top: 8.0, bottom: 20.0, left: 20.0),
+                      child: const TuitionNotificationSwitch())
                 ])
               ]),
           Container(
               padding: const EdgeInsets.all(10),
-              child: Row(
-                  children: <Widget>[
-                    Text('Referências pendentes',
-                        style: Theme.of(context).textTheme.titleLarge
-                            ?.apply(color: Theme.of(context).colorScheme.secondary)),
-                  ]
-              )
-          ),
+              child: Row(children: <Widget>[
+                Text('Referências pendentes',
+                    style: Theme.of(context).textTheme.titleLarge?.apply(
+                        color: Theme.of(context).colorScheme.secondary)),
+              ])),
           ReferenceWidgets(references: references),
-          const SizedBox(
-              height: 10
-          ),
+          const SizedBox(height: 10),
           showLastRefreshedTime(profileStateProvider.feesRefreshTime, context)
         ]);
       },
@@ -97,7 +95,8 @@ class AccountInfoCard extends GenericCard {
 class ReferenceWidgets extends StatelessWidget {
   final List<Reference> references;
 
-  const ReferenceWidgets({Key? key, required this.references}): super(key: key);
+  const ReferenceWidgets({Key? key, required this.references})
+      : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -114,16 +113,14 @@ class ReferenceWidgets extends StatelessWidget {
     if (references.length == 1) {
       return ReferenceSection(reference: references[0]);
     }
-    return Column(
-        children: [
-          ReferenceSection(reference: references[0]),
-          const Divider(
-            thickness: 1,
-            indent: 30,
-            endIndent: 30,
-          ),
-          ReferenceSection(reference: references[1]),
-        ]
-    );
+    return Column(children: [
+      ReferenceSection(reference: references[0]),
+      const Divider(
+        thickness: 1,
+        indent: 30,
+        endIndent: 30,
+      ),
+      ReferenceSection(reference: references[1]),
+    ]);
   }
 }