Error messages

lib/pages/dashboard_page.dart

@@ -2,6 +2,7 @@ import 'package:briessenchecker/models/checklist.dart';
 import 'package:briessenchecker/pages/detail_checklist_page.dart';
 import 'package:briessenchecker/services/checklist_provider.dart';
 import 'package:briessenchecker/services/dbhelper.dart';
+import 'package:briessenchecker/services/scaffold_messenger.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -87,8 +88,12 @@ class _DashboardPageState extends State<DashboardPage> {
   }
 
   void _onDeleteTapped() {
-    DbHelper.deleteChecklistByid(
-        checklists.elementAt(_selectedChecklistIndex!).id);
+    final checklist = checklists.elementAt(_selectedChecklistIndex!);
+    DbHelper.deleteChecklistByid(checklist.id);
+    if (!DbHelper.isOwner(checklist.ownerId)) {
+      Messenger.showError(
+          context, 'Can\'t delete checklists that aren\'t yours');
+    }
     setState(() {
       _selectedChecklistIndex = null;
     });

lib/pages/detail_checklist_page.dart

@@ -2,9 +2,11 @@ import 'package:briessenchecker/models/checklist.dart';
 import 'package:briessenchecker/models/listitem.dart';
 import 'package:briessenchecker/services/checklist_provider.dart';
 import 'package:briessenchecker/services/dbhelper.dart';
+import 'package:briessenchecker/widgets/item_detail_dialog.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+import '../services/scaffold_messenger.dart';
 import '../widgets/item_list_tile.dart';
 
 class DetailChecklistPage extends StatefulWidget {
@@ -78,69 +80,21 @@ class _DetailChecklistPageState extends State<DetailChecklistPage> {
   void _addItemTapped() {
     showDialog(
         context: context,
-        builder: (context) => _itemDetailDialog(context, null));
+        builder: (context) => ItemDetailDialog(checklistId: _checklist!.id));
   }
 
   void _itemTapped(int index) {
     _selectedItemId = _items.elementAt(index).id;
     showDialog(
         context: context,
-        builder: (context) => _itemDetailDialog(context, index)).whenComplete(
+        builder: (context) => ItemDetailDialog(
+              checklistId: _checklist!.id,
+              item: _items.elementAt(index),
+            )).whenComplete(
       () => _selectedItemId = null,
     );
   }
 
-  Widget _itemDetailDialog(BuildContext context, int? index) {
-    TextEditingController titleCon = TextEditingController();
-    TextEditingController descCon = TextEditingController();
-    if (_selectedItemId != null) {
-      final item = _items.elementAt(index!);
-      titleCon.text = item.title;
-      descCon.text = item.description;
-    }
-    return AlertDialog(
-      title: const Text('additem'),
-      content: Column(
-        mainAxisSize: MainAxisSize.min,
-        children: [
-          TextFormField(
-            controller: titleCon,
-            textInputAction: TextInputAction.next,
-            decoration: const InputDecoration(
-              label: Text('Title'),
-            ),
-          ),
-          TextFormField(
-            controller: descCon,
-            onFieldSubmitted: (value) =>
-                _itemSaved(titleCon.text, descCon.text),
-            decoration: const InputDecoration(
-              label: Text('Description'),
-            ),
-          ),
-        ],
-      ),
-      actions: [
-        TextButton(
-          onPressed: () {
-            _itemSaved(titleCon.text, descCon.text);
-          },
-          child: const Text('save'),
-        ),
-      ],
-    );
-  }
-
-  void _itemSaved(String title, String description) {
-    DbHelper.addOrUpdateItem(
-      _checklistProvider.selectedChecklistId!,
-      title,
-      description,
-      _selectedItemId,
-    );
-    Navigator.of(context).pop();
-  }
-
   Widget? _itemListBuilder(BuildContext context, int index) {
     Item item = _items.elementAt(index);
     return ItemListTile(
@@ -170,8 +124,17 @@ class _DetailChecklistPageState extends State<DetailChecklistPage> {
 
   void _onDeleteItemsPressed() {
     List<int> itemIds = [];
+    bool showErrorPrompt = false;
     for (final itemIndex in selectedItemIndexes) {
       itemIds.add(_items.elementAt(itemIndex).id!);
+      if (!showErrorPrompt) {
+        showErrorPrompt =
+            !DbHelper.isOwner(_items.elementAt(itemIndex).ownerId) &&
+                !DbHelper.isOwner(_checklist!.ownerId);
+      }
+    }
+    if (showErrorPrompt) {
+      Messenger.showError(context, 'Can\'t delete items that aren\'t yours.');
     }
     DbHelper.deleteItemsById(itemIds);
     setState(() {

lib/services/dbhelper.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:briessenchecker/services/checklist_provider.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -185,11 +187,15 @@ class DbHelper {
   }
 
   static Future<void> deleteItemById(int id) async {
-    await _client.from(itemsTableName).delete().eq('id', id);
+    await _client.from(itemsTableName).delete().eq('id', id).onError(_onError);
   }
 
   static Future<void> deleteItemsById(List<int> ids) async {
-    await _client.from(itemsTableName).delete().in_('id', ids);
+    await _client
+        .from(itemsTableName)
+        .delete()
+        .in_('id', ids)
+        .onError(_onError);
   }
 
   static Future<void> deleteChecklistByid(int id) async {
@@ -201,6 +207,12 @@ class DbHelper {
   static Stream<AuthState> get authChangeEventStream =>
       _client.auth.onAuthStateChange;
 
+  static bool isOwner(String id) {
+    return _client.auth.currentSession!.user.id == id;
+  }
+
+  static User? get currentUser => _client.auth.currentUser;
+
   static Stream<List<Map<String, dynamic>>> get checklistChangeEventStream =>
       _client.from(checklistsTableName).stream(primaryKey: ['id']);
 
@@ -245,4 +257,8 @@ class DbHelper {
     }
     return items;
   }
+
+  static FutureOr _onError(Object error, StackTrace stackTrace) {
+    print(error);
+  }
 }

lib/services/scaffold_messenger.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+class Messenger {
+  static void showError(BuildContext context, String error) {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        backgroundColor: Theme.of(context).colorScheme.error,
+        content: Text(
+          error,
+          style: TextStyle(color: Theme.of(context).colorScheme.onError),
+        ),
+      ),
+    );
+  }
+}

lib/widgets/item_detail_dialog.dart

@@ -0,0 +1,77 @@
+import 'package:flutter/material.dart';
+
+import '../models/listitem.dart';
+import '../services/dbhelper.dart';
+
+class ItemDetailDialog extends StatelessWidget {
+  const ItemDetailDialog({
+    super.key,
+    this.item,
+    required this.checklistId,
+  });
+  final Item? item;
+  final int checklistId;
+
+  @override
+  Widget build(BuildContext context) {
+    final TextEditingController titleCon = TextEditingController();
+    final TextEditingController descCon = TextEditingController();
+    bool isOwner = true;
+    String dialogTitle = 'Add item';
+
+    if (item != null) {
+      titleCon.text = item!.title;
+      descCon.text = item!.description;
+      isOwner = DbHelper.isOwner(item!.ownerId);
+      isOwner ? dialogTitle = 'Edit Item' : dialogTitle = item!.title;
+    }
+
+    return AlertDialog(
+      title: Text(dialogTitle),
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          if (isOwner)
+            TextFormField(
+              controller: titleCon,
+              textInputAction: TextInputAction.next,
+              decoration: const InputDecoration(
+                label: Text('Title'),
+              ),
+            ),
+          if (isOwner)
+            TextFormField(
+              controller: descCon,
+              onFieldSubmitted: (value) {
+                _itemSaved(titleCon.text, descCon.text);
+                Navigator.of(context).pop();
+              },
+              decoration: const InputDecoration(
+                label: Text('Description'),
+              ),
+            ),
+          if (!isOwner) Text(item!.description),
+        ],
+      ),
+      actions: [
+        TextButton(
+          onPressed: () {
+            _itemSaved(titleCon.text, descCon.text);
+            Navigator.of(context).pop();
+          },
+          child: const Text('save'),
+        ),
+      ],
+    );
+  }
+
+  void _itemSaved(String title, String description) {
+    DbHelper.addOrUpdateItem(
+      checklistId,
+      title,
+      description,
+      item?.id,
+    );
+  }
+}