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todo-flutter/lib/state/todo_state.dart

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+import 'package:flutter/foundation.dart';
+import '../models/todo.dart';
+import '../db.dart';
+
+const List<String> categories = ['Personal', 'Work', 'Shopping', 'Health', 'Other'];
+const List<String> priorityKeys = ['low', 'medium', 'high'];
+const Map<String, int> priorityColors = {
+  'low': 0xFF4CAF50,
+  'medium': 0xFFFF9800,
+  'high': 0xFFF44336,
+};
+
+enum TodoFilter { all, active, completed }
+
+class TodoState extends ChangeNotifier {
+  List<Todo> _todos = [];
+  TodoFilter _filter = TodoFilter.all;
+
+  List<Todo> get todos => _todos;
+  TodoFilter get filter => _filter;
+
+  List<Todo> get filteredTodos {
+    switch (_filter) {
+      case TodoFilter.active:
+        return _todos.where((t) => !t.completed).toList();
+      case TodoFilter.completed:
+        return _todos.where((t) => t.completed).toList();
+      case TodoFilter.all:
+        return _todos;
+    }
+  }
+
+  Map<String, int> get counts => {
+    'all': _todos.length,
+    'active': _todos.where((t) => !t.completed).length,
+    'completed': _todos.where((t) => t.completed).length,
+  };
+
+  void setTodos(List<Todo> todos) {
+    _todos = todos;
+    notifyListeners();
+  }
+
+  void setFilter(TodoFilter f) {
+    _filter = f;
+    notifyListeners();
+  }
+
+  Future<void> addTodo(String title, String category, String priority) async {
+    final id = await TodoDatabase.insertTodo(title, category, priority);
+    _todos.insert(0, Todo(
+      id: id,
+      title: title,
+      category: category,
+      priority: priority,
+      createdAt: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    ));
+    notifyListeners();
+  }
+
+  Future<void> toggleTodo(int id) async {
+    final idx = _todos.indexWhere((t) => t.id == id);
+    if (idx == -1) return;
+    final todo = _todos[idx];
+    final newCompleted = !todo.completed;
+    _todos[idx] = todo.copyWith(completed: newCompleted);
+    notifyListeners();
+    await TodoDatabase.toggleTodo(id, newCompleted);
+  }
+
+  Future<void> updateTodo(int id, String title, String category, String priority) async {
+    final idx = _todos.indexWhere((t) => t.id == id);
+    if (idx == -1) return;
+    _todos[idx] = _todos[idx].copyWith(
+      title: title,
+      category: category,
+      priority: priority,
+    );
+    notifyListeners();
+    await TodoDatabase.updateTodo(id, title, category, priority);
+  }
+
+  Future<void> deleteTodo(int id) async {
+    _todos.removeWhere((t) => t.id == id);
+    notifyListeners();
+    await TodoDatabase.deleteTodo(id);
+  }
+}