Add button to call fix iCal calendars cloud function to admin console (…

…#1625)

![image](https://github.com/SharezoneApp/sharezone-app/assets/24459435/f17a2b7b-35cd-4a89-9d1e-e4d361d10c1a)

console/lib/home_page.dart

@@ -10,6 +10,7 @@ import 'package:flutter/material.dart';
 import 'package:sharezone_console/activation_codes/activation_codes_page.dart';
 import 'package:sharezone_console/pages/change_type_of_user.dart';
 import 'package:sharezone_console/pages/feedbacks/feedbacks_page.dart';
+import 'package:sharezone_console/pages/fix_ical_calendars.dart';
 
 Future<void> openPage(BuildContext context, Widget widget) {
   return Navigator.push(
@@ -48,6 +49,13 @@ class HomePage extends StatelessWidget {
               openPage(context, FeedbacksPage());
             },
           ),
+          ListTile(
+            leading: Icon(Icons.calendar_today),
+            title: const Text("Fix iCal Calendars"),
+            onTap: () {
+              openPage(context, FixICalCalendars());
+            },
+          ),
         ],
       ),
     );

console/lib/pages/fix_ical_calendars.dart

@@ -0,0 +1,107 @@
+// Copyright (c) 2024 Sharezone UG (haftungsbeschränkt)
+// Licensed under the EUPL-1.2-or-later.
+//
+// You may obtain a copy of the Licence at:
+// https://joinup.ec.europa.eu/software/page/eupl
+//
+// SPDX-License-Identifier: EUPL-1.2
+
+import 'package:cloud_functions/cloud_functions.dart';
+import 'package:flutter/material.dart';
+
+class FixICalCalendars extends StatefulWidget {
+  const FixICalCalendars({super.key});
+
+  @override
+  State<FixICalCalendars> createState() => _FixICalCalendarsState();
+}
+
+class _FixICalCalendarsState extends State<FixICalCalendars> {
+  int? amountOfFixedCalendars;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text("Fix iCal Calendars"),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            SizedBox(
+              width: 300,
+              child: Text(
+                'A cloud function that can be used to check if some iCal calendars are not in sync with the database. If they are not in sync, they will be fixed.',
+                textAlign: TextAlign.center,
+              ),
+            ),
+            const SizedBox(height: 12),
+            _Button(
+              (int amount) {
+                setState(() {
+                  amountOfFixedCalendars = amount;
+                });
+              },
+            ),
+            if (amountOfFixedCalendars != null)
+              Padding(
+                padding: const EdgeInsets.only(top: 8),
+                child: Text("Fixed $amountOfFixedCalendars calendars"),
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _Button extends StatefulWidget {
+  const _Button(this.amountOfFixedCalendars);
+
+  final ValueChanged<int> amountOfFixedCalendars;
+
+  @override
+  State<_Button> createState() => _ButtonState();
+}
+
+class _ButtonState extends State<_Button> {
+  bool isLoading = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return ElevatedButton(
+      onPressed: isLoading
+          ? null
+          : () async {
+              setState(() {
+                isLoading = true;
+              });
+
+              try {
+                final cfs =
+                    FirebaseFunctions.instanceFor(region: 'europe-west1');
+                final function = cfs.httpsCallable('fixICalCalendars');
+
+                final result = await function.call<Map<String, dynamic>>();
+                widget.amountOfFixedCalendars(
+                    result.data['amountOfFixedCalendars']);
+              } catch (e) {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(
+                    content: Text('Error: $e'),
+                  ),
+                );
+              } finally {
+                setState(() {
+                  isLoading = false;
+                });
+              }
+            },
+      child: Text(
+        isLoading ? "Loading..." : "Fix",
+        style: TextStyle(color: Colors.white),
+      ),
+    );
+  }
+}