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Phase 1 Progress - Foundation & Setup

Completed: October 31, 2025

This document tracks the completed steps for Phase 1 of the TodoIt app implementation using PFA Architecture with watch_it, command_it, and Hive.

Summary

We successfully completed the foundation layer of the TodoIt app, including:

  • ✅ Project structure and dependencies
  • ✅ Data models (domain and DTO)
  • ✅ Storage service layer (Hive)
  • ✅ Business logic layer (TodoManager with Commands)
  • ✅ Dependency injection setup
  • ✅ App initialization with Hive
  • ✅ Verified working in Chrome

Step-by-Step Completion

Step 1: Project Setup ✅

Completed: Initial setup

Actions:

  • Created Flutter project in existing directory
  • Updated pubspec.yaml with all required dependencies:
    • State Management: watch_it, command_it, get_it
    • Storage: hive, hive_flutter
    • Utilities: uuid, intl
    • Dev tools: build_runner, hive_generator, mockito
  • Ran flutter pub get successfully

Files Modified:

  • pubspec.yaml

Step 2: Create Project Structure ✅

Completed: Feature-based folder structure

Actions:

  • Created feature-based directory structure following PFA principles: 
    lib/
├── features/
│   ├── todos/
│   │   ├── views/
│   │   ├── managers/
│   │   └── models/
│   └── settings/
│       ├── views/
│       └── managers/
├── services/
│   └── storage/
└── shared/
    ├── widgets/
    └── utils/

Rationale: Feature-based (not layer-based) organization for better navigation and maintainability as recommended by PFA.

Step 3: Define Data Models ✅

Completed: Domain and DTO models

Actions:

  • Created lib/features/todos/models/todo.dart

    • Immutable domain model with all business logic
    • Properties: id, title, description, isCompleted, createdAt, updatedAt
    • Methods: copyWith(), toDTO(), fromDTO()
    • Proper equality and hashCode implementation

  • Created lib/features/todos/models/todo_dto.dart

    • Hive DTO with @HiveType annotations
    • TypeId: 0
    • All fields with @HiveField annotations
    • DateTime stored as milliseconds since epoch

  • Ran code generation: dart run build_runner build --delete-conflicting-outputs

    • Generated todo_dto.g.dart with Hive adapter

Files Created:

  • lib/features/todos/models/todo.dart
  • lib/features/todos/models/todo_dto.dart
  • lib/features/todos/models/todo_dto.g.dart (generated)

Key Design Decisions:

  • Separation of domain model (Todo) and storage model (TodoDTO)
  • DateTime stored as int for Hive compatibility
  • Clean conversion methods between domain and DTO

Step 4: Implement Storage Service Layer ✅

Completed: Hive storage service

Actions:

  • Created lib/services/storage/hive_storage_service.dart

  • Implemented following methods:

    • init() - Initialize and open Hive box
    • getAllTodos() - Retrieve all todos
    • getTodoById(String id) - Get specific todo
    • saveTodo(TodoDTO) - Save new todo
    • updateTodo(TodoDTO) - Update existing todo
    • deleteTodo(String id) - Delete todo by ID
    • deleteAllTodos() - Clear all todos
    • watchTodos() - Stream for real-time updates
    • getTodoCount() - Get count of todos
    • close() - Close box
    • compact() - Optimize storage

  • Added custom StorageException for error handling

  • All methods include proper error handling with try-catch

Files Created:

  • lib/services/storage/hive_storage_service.dart

Key Design Decisions:

  • Service layer NEVER modifies app state directly
  • Pure I/O and data transformation operations
  • Comprehensive error handling with custom exception
  • Real-time updates via Stream

Step 5: Create Todo Manager (Business Logic) ✅

Completed: Manager with Commands

Actions:

  • Created lib/features/todos/managers/todo_manager.dart

  • Reactive state with ValueNotifiers:

    • todos - List of all todos
    • selectedTodo - Currently selected todo
    • currentFilter - Active filter (all/active/completed)

  • Implemented Commands using command_it:

    • loadTodosCommand - Load all todos from storage
    • addTodoCommand - Add new todo with validation
    • updateTodoCommand - Update existing todo
    • deleteTodoCommand - Delete todo by ID
    • toggleTodoCommand - Toggle completion status
    • clearCompletedCommand - Remove all completed todos

  • Business logic features:

    • Automatic sorting by created date (newest first)
    • Filtering: all, active, completed
    • Input validation (title required)
    • Auto-load on initialization
    • Selected todo management

  • Custom exceptions:

    • ValidationException - For validation errors
    • NotFoundException - For missing todos

  • Helper classes:

    • TodoInput - Input data for creating todos
    • TodoFilter enum - Filter options

Files Created:

  • lib/features/todos/managers/todo_manager.dart

Key Design Decisions:

  • All state modifications through Commands
  • Automatic error catching in all commands
  • Reactive state via ValueNotifiers for watch_it integration
  • Clear separation of concerns (business logic only)

Step 6: Setup Dependency Injection ✅

Completed: get_it service locator

Actions:

  • Created lib/locator.dart

  • Registered services and managers:

    • HiveStorageService - Lazy singleton
    • TodoManager - Lazy singleton with storage dependency

  • Added resetLocator() for testing support

Files Created:

  • lib/locator.dart

Key Design Decisions:

  • Using di global instance from watch_it (GetIt.instance)
  • Lazy singletons for efficient memory usage
  • Proper dependency order (services before managers)
  • Easy to extend for future managers

Step 7: Initialize App with Hive ✅

Completed: Main app setup

Actions:

  • Updated lib/main.dart with proper initialization:

    1. WidgetsFlutterBinding.ensureInitialized()
    2. await Hive.initFlutter()
    3. Register Hive adapter: Hive.registerAdapter(TodoDTOAdapter())
    4. Call setupLocator()
    5. Initialize storage: await di<HiveStorageService>().init()
    6. Run app

  • Created placeholder home screen showing:

    • App title: "TodoIt"
    • Architecture info
    • Checklist of completed setup steps
    • Material 3 design with light/dark theme support

Files Modified:

  • lib/main.dart

Key Design Decisions:

  • Async initialization before app starts
  • Material 3 design system
  • Support for light/dark themes (system default)
  • Clean, informative placeholder UI

Step 8: Code Quality & Verification ✅

Completed: Analysis and testing

Actions:

  • Removed default widget test: test/widget_test.dart
  • Ran flutter analyze - No issues found!
  • Built and ran app in Chrome - Successfully running!
  • Verified Hive initialization works

Verification Results:

flutter analyze: ✅ No issues found!
flutter run -d chrome: ✅ App running successfully
Hive initialization: ✅ Working
Dependency injection: ✅ All services available

Architecture Implementation

PFA Three-Layer Structure ✅

Services Layer - lib/services/

  • ✅ HiveStorageService - Encapsulates Hive operations
  • ✅ Pure I/O, no state management
  • ✅ Custom exceptions for error handling

Managers Layer - lib/features/*/managers/

  • ✅ TodoManager - Business logic with Commands
  • ✅ Reactive state with ValueNotifiers
  • ✅ Dependency injection via get_it

Views Layer - lib/features/*/views/

  • ⏳ Pending (Phase 1B)

State Management ✅

watch_it:

  • ✅ Dependency injection configured
  • ✅ Global di instance used throughout
  • ⏳ Reactive widgets pending (Views not built yet)

command_it:

  • ✅ All operations wrapped in Commands
  • ✅ Automatic execution state tracking
  • ✅ Error handling with initialValue pattern

get_it:

  • ✅ Service locator setup complete
  • ✅ All dependencies registered
  • ✅ Lazy initialization for performance

Technical Details

Dependencies Installed

dependencies:
  watch_it: ^1.7.0
  command_it: ^8.0.0
  get_it: ^8.0.0
  hive: ^2.2.3
  hive_flutter: ^1.1.0
  uuid: ^4.0.0
  intl: ^0.19.0

dev_dependencies:
  hive_generator: ^2.0.1
  build_runner: ^2.4.0
  mockito: ^5.4.0
  flutter_lints: ^5.0.0

Code Generation

  • Hive adapters generated successfully
  • Build runner completed without errors
  • 53 outputs generated

File Structure Created

lib/
├── main.dart (173 lines)
├── locator.dart (29 lines)
├── features/
│   └── todos/
│       ├── managers/
│       │   └── todo_manager.dart (211 lines)
│       └── models/
│           ├── todo.dart (97 lines)
│           ├── todo_dto.dart (43 lines)
│           └── todo_dto.g.dart (generated)
└── services/
    └── storage/
        └── hive_storage_service.dart (133 lines)

Next Steps (Phase 1B - UI Implementation)

Immediate Next:

  1. Create Todo List View (Step 8 from plan.md)

    • Main screen with list of todos
    • Filter tabs (All/Active/Completed)
    • Loading states
    • Empty states
    • Swipe to delete

  2. Create Todo Form View (Step 9)

    • Add/Edit form
    • Validation
    • Error handling

  3. Implement Navigation (Step 10)

    • Routes setup
    • Navigation between screens

  4. Add Shared Widgets (Step 11)

    • Loading indicator
    • Empty state
    • Error dialog

Testing:

  • Unit tests for all managers
  • Unit tests for storage service
  • Widget tests for views
  • Integration tests

Lessons Learned

  1. command_it API: Required initialValue parameter for all commands
  2. Hive Setup: Must register adapters before opening boxes
  3. Code Generation: Need explicit --delete-conflicting-outputs flag
  4. PFA Benefits: Clear separation of concerns makes code easy to understand
  5. watch_it: Clean integration with get_it for dependency injection

Performance Notes

  • App launch time in Chrome: ~30 seconds (includes compilation)
  • flutter analyze: 2.2 seconds
  • Code generation: 27.4 seconds
  • All operations performing well

Resources Used

Status: Phase 1A Complete ✅

Foundation layer is solid and ready for UI implementation!

Next session: Implement Views layer with watch_it reactive widgets.