refactoring to a proper MVVM

TODO.md

@@ -0,0 +1,75 @@
+# LocalChat (lchat) - Improvement Plan
+
+## Phase 1: Architecture Foundation
+
+### 1.1 MVVM with ViewModels and Repository Pattern ✅
+- [x] Create ViewModels for each screen (LobbyViewModel, ChatViewModel)
+- [x] Extract business logic from Fragments to ViewModels
+- [x] Create Repository layer for data operations
+- [x] Implement proper state management with LiveData/StateFlow
+- [x] Add ViewModelFactory if needed
+
+### 1.2 Dependency Injection with Hilt
+- [ ] Add Hilt dependencies
+- [ ] Set up Hilt modules for WifiAwareManager
+- [ ] Convert singletons to proper DI
+- [ ] Inject ViewModels using Hilt
+
+## Phase 2: Core UX Improvements
+
+### 2.1 Connection Status Management
+- [ ] Add connection state to ViewModels
+- [ ] Create UI indicator for connection status
+- [ ] Show real-time connection state changes
+- [ ] Add connection error messages
+
+### 2.2 User List Feature
+- [ ] Track connected users in Repository
+- [ ] Add UI to display active users
+- [ ] Handle user join/leave events
+- [ ] Show user count in chat header
+
+## Phase 3: Data Persistence
+
+### 3.1 Room Database Setup
+- [ ] Add Room dependencies
+- [ ] Create Message and User entities
+- [ ] Implement DAOs for data access
+- [ ] Create database migrations
+
+### 3.2 Message Persistence
+- [ ] Store messages in Room database
+- [ ] Load message history on app restart
+- [ ] Implement message sync logic
+- [ ] Add message timestamps
+
+## Phase 4: Reliability Improvements
+
+### 4.1 Reconnection Handling
+- [ ] Detect connection drops
+- [ ] Implement exponential backoff retry
+- [ ] Preserve message queue during disconnection
+- [ ] Auto-reconnect when network available
+
+### 4.2 Network State Monitoring
+- [ ] Monitor WiFi state changes
+- [ ] Handle app lifecycle properly
+- [ ] Save and restore connection state
+
+## Phase 5: Advanced Features
+
+### 5.1 Background Service
+- [ ] Create foreground service for persistent connection
+- [ ] Handle Doze mode and battery optimization
+- [ ] Add notification for active chat
+- [ ] Implement proper service lifecycle
+
+### 5.2 Additional Features
+- [ ] Message delivery status
+- [ ] Typing indicators
+- [ ] File/image sharing support
+- [ ] Message encryption improvements
+
+## Current Status
+- 🚀 Starting with Phase 1.1 - MVVM Architecture
+- Target: Create a maintainable, testable architecture