From c9deb726e094592b5deaa73a2cf215be48051c76 Mon Sep 17 00:00:00 2001
From: SomnusVeritas <sites@skup.in>
Date: Wed, 8 Nov 2023 12:57:45 +0100
Subject: [PATCH] implemented undo button and proper sorting

---
 lib/models/todo.dart            |  9 +++------
 lib/pages/todo_create_page.dart |  7 ++++++-
 lib/services/dbhelper.dart      |  2 +-
 lib/widgets/todo_list.dart      | 20 +++++++++++++++++++-
 4 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/lib/models/todo.dart b/lib/models/todo.dart
index 7ea97cc..9b70402 100644
--- a/lib/models/todo.dart
+++ b/lib/models/todo.dart
@@ -1,7 +1,5 @@
 import 'package:isar/isar.dart';
 
-import '../services/dbhelper.dart';
-
 part 'todo.g.dart';
 
 @collection
@@ -13,11 +11,10 @@ class Todo {
   bool done;
 
   Todo({
-    int? index,
+    required this.id,
     required this.title,
+    required this.createdAt,
     this.description = '',
-    DateTime? createdTime,
     this.done = false,
-  })  : createdAt = createdTime ?? DateTime.now(),
-        id = index ?? DbHelper.nextTodoId;
+  });
 }
diff --git a/lib/pages/todo_create_page.dart b/lib/pages/todo_create_page.dart
index 9518647..0d35ca9 100644
--- a/lib/pages/todo_create_page.dart
+++ b/lib/pages/todo_create_page.dart
@@ -56,7 +56,12 @@ class _CreateTodoPageState extends State<CreateTodoPage> {
   }
 
   void _onSubmitted() {
-    DbHelper.addOrUpdateTodo(Todo(title: _title, description: _description));
+    DbHelper.addOrUpdateTodo(Todo(
+      id: DbHelper.nextTodoId,
+      title: _title,
+      description: _description,
+      createdAt: DateTime.now(),
+    ));
     Navigator.of(context).pop();
   }
 }
diff --git a/lib/services/dbhelper.dart b/lib/services/dbhelper.dart
index 22846c7..3efb614 100644
--- a/lib/services/dbhelper.dart
+++ b/lib/services/dbhelper.dart
@@ -17,7 +17,7 @@ class DbHelper {
   }
 
   static List<Todo> fetchTodos() =>
-      _isar.todos.where().doneEqualTo(false).findAll();
+      _isar.todos.where().doneEqualTo(false).sortByCreatedAtDesc().findAll();
 
   static void addOrUpdateTodo(Todo todo) =>
       _isar.write((isar) => isar.todos.put(todo));
diff --git a/lib/widgets/todo_list.dart b/lib/widgets/todo_list.dart
index 9915bb5..75a0027 100644
--- a/lib/widgets/todo_list.dart
+++ b/lib/widgets/todo_list.dart
@@ -39,7 +39,11 @@ class _TodoListState extends State<TodoList> {
       tileColor: Theme.of(context).colorScheme.primaryContainer,
       title: Text(todo.title),
       trailing: IconButton(
-        onPressed: () {},
+        onPressed: () {
+          todo.done = true;
+          DbHelper.addOrUpdateTodo(todo);
+          _showSnackbar(todo);
+        },
         icon: Icon(
           Icons.check_box,
           color: Theme.of(context).colorScheme.primary,
@@ -47,4 +51,18 @@ class _TodoListState extends State<TodoList> {
       ),
     );
   }
+
+  void _showSnackbar(Todo todo) {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: const Text('Todo done'),
+        action: SnackBarAction(
+            label: 'Undo',
+            onPressed: () {
+              todo.done = false;
+              DbHelper.addOrUpdateTodo(todo);
+            }),
+      ),
+    );
+  }
 }