lib/
│
├── main.dart                // App entry point
│
├── core/                    // Core utilities (constants, helpers, theme)
│   ├── constants/
│   │   ├── app_colors.dart
│   │   ├── app_strings.dart
│   │   └── api_endpoints.dart
│   ├── theme/
│   │   └── app_theme.dart
│   └── utils/
│       ├── date_time_helper.dart
│       └── notification_helper.dart
│
├── data/                    // Data layer (API + Local DB)
│   ├── models/
│   │   ├── task_model.dart
│   │   └── quote_model.dart
│   ├── services/
│   │   ├── api_service.dart       // Uses Dio for API calls
│   │   ├── quote_api.dart         // Fetch motivational quote
│   │   └── local_db_service.dart  // (Hive/SQLite)
│   └── repositories/
│       ├── task_repository.dart
│       └── quote_repository.dart
│
├── providers/               // State management (Provider/ChangeNotifier)
│   ├── task_provider.dart
│   └── quote_provider.dart
│
├── ui/                      // Presentation layer
│   ├── screens/
│   │   ├── home_screen.dart
│   │   ├── add_task_screen.dart
│   │   ├── task_detail_screen.dart
│   │   └── settings_screen.dart
│   ├── widgets/
│   │   ├── task_tile.dart
│   │   └── custom_button.dart
│   └── dialogs/
│       └── add_task_dialog.dart
│
└── routes/
    └── app_routes.dart       // Centralized route management

🏗️ Layered Explanation

1. Core Layer

• constants/ → Strings, colors, endpoints (no hardcoding).
• utils/ → Helpers like date formatting, notification scheduler.
• theme/ → Centralized app theme.

2. Data Layer

• models/ → Defines the data structure (e.g., TaskModel {id, title, description, dueDate, isCompleted}).
• services/ → Handles external I/O:
  • api_service.dart → Wrapper around Dio (base URL, headers, error handling).
  • quote_api.dart → Calls a quotes API (like ZenQuotes) for daily motivation.
  • local_db_service.dart → Manages local persistence (Hive or SQLite).
• repositories/ → Acts as a bridge: combines services logic and prepares data for Providers.

3. Providers (State Management Layer)

• task_provider.dart
  • Manages tasks: add, edit, delete, mark complete, load from DB.
  • Holds task list state.
• quote_provider.dart
  • Fetches and stores daily motivational quote from API.

4. UI Layer

• screens/
  • home_screen.dart → Shows today’s tasks + motivational quote.
  • add_task_screen.dart → Add/edit tasks with due date.
  • task_detail_screen.dart → View details, set reminders.
  • settings_screen.dart → Manage notifications, theme, etc.