adding shared prefs to save the users name

TODO.md

@@ -9,11 +9,27 @@
 - [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
+### 1.2 Dependency Injection with Hilt ✅
+- [x] Add Hilt dependencies
+- [x] Set up Hilt modules for WifiAwareManager
+- [x] Convert singletons to proper DI
+- [x] Inject ViewModels using Hilt
+
+### 1.3 Room Database Setup
+- [ ] Add Room dependencies
+- [ ] Create Message and User entities
+- [ ] Implement DAOs for data access
+- [ ] Create database migrations
+- [ ] Store messages in Room database
+- [ ] Load message history on app restart
+- [ ] Implement message sync logic
+
+### 1.4 Coroutines & Flow Optimization
+- [ ] Convert callbacks to coroutines
+- [ ] Use Flow for reactive data streams
+- [ ] Implement proper scope management
+- [ ] Replace GlobalScope with proper lifecycle scopes
+- [ ] Add proper error handling with coroutines
 
 ## Phase 2: Core UX Improvements
 
@@ -29,19 +45,50 @@
 - [ ] Handle user join/leave events
 - [ ] Show user count in chat header
 
-## Phase 3: Data Persistence
+### 2.3 Enhanced Messaging Features
+- [ ] Message status indicators (sent/delivered/read)
+- [ ] User presence indicators (online/offline/typing)
+- [ ] Message timestamps with proper formatting
+- [ ] Offline message queue
+- [ ] Message retry mechanism
+- [ ] Long press message actions (copy, delete)
 
-### 3.1 Room Database Setup
-- [ ] Add Room dependencies
-- [ ] Create Message and User entities
-- [ ] Implement DAOs for data access
-- [ ] Create database migrations
+### 2.4 File & Media Sharing
+- [ ] Image sharing support
+- [ ] File transfer capability
+- [ ] Image preview in chat
+- [ ] Progress indicators for transfers
+- [ ] File size limits and validation
 
-### 3.2 Message Persistence
-- [ ] Store messages in Room database
-- [ ] Load message history on app restart
-- [ ] Implement message sync logic
-- [ ] Add message timestamps
+## Phase 3: UI/UX Improvements
+
+### 3.1 Material 3 Design Update
+- [ ] Migrate to Material 3 components
+- [ ] Implement dynamic color theming
+- [ ] Update typography and spacing
+- [ ] Add proper elevation and shadows
+- [ ] Implement Material You design principles
+
+### 3.2 Dark Theme & Theming
+- [ ] Implement dark theme
+- [ ] Add theme toggle in settings
+- [ ] System theme detection
+- [ ] Custom color schemes
+- [ ] Persist theme preference
+
+### 3.3 Animations & Polish
+- [ ] Message send/receive animations
+- [ ] Screen transition animations
+- [ ] Loading state animations
+- [ ] Smooth scrolling improvements
+- [ ] Haptic feedback
+
+### 3.4 Better Error Handling UI
+- [ ] User-friendly error messages
+- [ ] Retry mechanisms with UI feedback
+- [ ] Connection lost/restored snackbars
+- [ ] Empty states for no messages/users
+- [ ] Inline error states
 
 ## Phase 4: Reliability Improvements
 
@@ -56,26 +103,78 @@
 - [ ] Handle app lifecycle properly
 - [ ] Save and restore connection state
 
-## Phase 5: Advanced Features
+## Phase 5: Security & Privacy
 
-### 5.1 Background Service
+### 5.1 Message Encryption
+- [ ] End-to-end encryption implementation
+- [ ] Key exchange protocol
+- [ ] Message integrity verification
+- [ ] Secure key storage
+- [ ] Forward secrecy
+
+### 5.2 Privacy Features
+- [ ] Optional username anonymization
+- [ ] Message auto-deletion
+- [ ] Block/unblock users
+- [ ] Private rooms with passwords
+- [ ] Data export/import
+
+## Phase 6: Advanced Features
+
+### 6.1 Background Service
 - [ ] Create foreground service for persistent connection
 - [ ] Handle Doze mode and battery optimization
 - [ ] Add notification for active chat
 - [ ] Implement proper service lifecycle
+- [ ] Wake lock management
 
-### 5.2 Additional Features
-- [ ] Message delivery status
-- [ ] Typing indicators
-- [ ] File/image sharing support
-- [ ] Message encryption improvements
+### 6.2 Settings & Preferences
+- [ ] Create settings screen
+- [ ] Notification preferences
+- [ ] Sound/vibration settings
+- [ ] Auto-reconnect toggle
+- [ ] Message history limits
+
+## Phase 7: Testing & Quality
+
+### 7.1 Unit Testing
+- [ ] Test ViewModels
+- [ ] Test Repository logic
+- [ ] Test data transformations
+- [ ] Test error scenarios
+- [ ] Mock dependencies with Hilt testing
+
+### 7.2 Integration Testing
+- [ ] Test database operations
+- [ ] Test network layer
+- [ ] Test complete user flows
+- [ ] Test state persistence
+
+### 7.3 UI Testing
+- [ ] Espresso tests for main flows
+- [ ] Test navigation
+- [ ] Test user interactions
+- [ ] Screenshot testing
+- [ ] Accessibility testing
 
 ## Current Status
 - ✅ Phase 1.1 - MVVM Architecture - COMPLETED
+- ✅ Phase 1.2 - Dependency Injection with Hilt - COMPLETED
 - ✅ Phase 2.1 - Connection Status Management - COMPLETED
-- 🚀 Next: Phase 1.2 (Dependency Injection) or Phase 3 (Data Persistence)
+- 🚀 Next Priority Options:
+  - Phase 1.3 - Room Database (Foundation for persistence)
+  - Phase 2.2 - User List Feature (Core UX)
+  - Phase 2.3 - Enhanced Messaging (Better UX)
+  - Phase 3.1 - Material 3 Update (Modern UI)
 
 ## Completed Work Summary
 1. **MVVM Architecture**: ViewModels, Repository pattern, proper separation of concerns
-2. **Connection Status**: Visual indicator with real-time updates, activity-based detection
-3. **Sleep/Wake Handling**: Auto-recovery when messages resume after device sleep
+2. **Dependency Injection**: Hilt integration with proper scoping and lifecycle management
+3. **Connection Status**: Visual indicator with real-time updates, activity-based detection
+4. **Sleep/Wake Handling**: Auto-recovery when messages resume after device sleep
+
+## Development Notes
+- Architecture foundation (Phase 1) should be completed before moving to advanced features
+- UI/UX improvements (Phase 3) can be done in parallel with feature development
+- Testing (Phase 7) should be implemented incrementally as features are added
+- Security features (Phase 5) are important for production readiness

app/src/main/java/com/mattintech/lchat/ui/LobbyFragment.kt

@@ -1,6 +1,8 @@
 package com.mattintech.lchat.ui
 
 import android.os.Bundle
+import android.text.Editable
+import android.text.TextWatcher
 import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
@@ -48,6 +50,18 @@ class LobbyFragment : Fragment() {
     }
     
     private fun setupUI() {
+        binding.nameInput.addTextChangedListener(object : TextWatcher {
+            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
+            
+            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
+            
+            override fun afterTextChanged(s: Editable?) {
+                s?.toString()?.trim()?.let { name ->
+                    viewModel.saveUserName(name)
+                }
+            }
+        })
+        
         binding.modeRadioGroup.setOnCheckedChangeListener { _, checkedId ->
             when (checkedId) {
                 R.id.hostRadio -> {
@@ -80,6 +94,12 @@ class LobbyFragment : Fragment() {
     }
     
     private fun observeViewModel() {
+        viewModel.savedUserName.observe(viewLifecycleOwner) { savedName ->
+            if (!savedName.isNullOrEmpty() && binding.nameInput.text.isNullOrEmpty()) {
+                binding.nameInput.setText(savedName)
+            }
+        }
+        
         viewModel.state.observe(viewLifecycleOwner) { state ->
             when (state) {
                 is LobbyState.Idle -> {

app/src/main/java/com/mattintech/lchat/utils/PreferencesManager.kt

@@ -0,0 +1,36 @@
+package com.mattintech.lchat.utils
+
+import android.content.Context
+import android.content.SharedPreferences
+import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class PreferencesManager @Inject constructor(
+    @ApplicationContext private val context: Context
+) {
+    private val sharedPreferences: SharedPreferences = 
+        context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    fun saveUserName(name: String) {
+        if (name.isBlank()) {
+            clearUserName()
+        } else {
+            sharedPreferences.edit().putString(KEY_USER_NAME, name).apply()
+        }
+    }
+
+    fun getUserName(): String? {
+        return sharedPreferences.getString(KEY_USER_NAME, null)
+    }
+
+    fun clearUserName() {
+        sharedPreferences.edit().remove(KEY_USER_NAME).apply()
+    }
+
+    companion object {
+        private const val PREFS_NAME = "lchat_preferences"
+        private const val KEY_USER_NAME = "user_name"
+    }
+}

app/src/main/java/com/mattintech/lchat/viewmodel/LobbyViewModel.kt

@@ -5,6 +5,7 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.mattintech.lchat.repository.ChatRepository
+import com.mattintech.lchat.utils.PreferencesManager
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.launch
 import javax.inject.Inject
@@ -27,7 +28,8 @@ sealed class LobbyEvent {
 
 @HiltViewModel
 class LobbyViewModel @Inject constructor(
-    private val chatRepository: ChatRepository
+    private val chatRepository: ChatRepository,
+    private val preferencesManager: PreferencesManager
 ) : ViewModel() {
     
     private val _state = MutableLiveData<LobbyState>(LobbyState.Idle)
@@ -36,8 +38,16 @@ class LobbyViewModel @Inject constructor(
     private val _events = MutableLiveData<LobbyEvent?>()
     val events: LiveData<LobbyEvent?> = _events
     
+    private val _savedUserName = MutableLiveData<String?>()
+    val savedUserName: LiveData<String?> = _savedUserName
+    
     init {
         setupConnectionCallback()
+        loadSavedUserName()
+    }
+    
+    private fun loadSavedUserName() {
+        _savedUserName.value = preferencesManager.getUserName()
     }
     
     private fun setupConnectionCallback() {
@@ -65,6 +75,7 @@ class LobbyViewModel @Inject constructor(
         
         viewModelScope.launch {
             _state.value = LobbyState.Connecting
+            preferencesManager.saveUserName(userName)
             chatRepository.startHostMode(roomName)
             _events.value = LobbyEvent.NavigateToChat(roomName, userName, true)
         }
@@ -78,11 +89,13 @@ class LobbyViewModel @Inject constructor(
         
         viewModelScope.launch {
             _state.value = LobbyState.Connecting
+            preferencesManager.saveUserName(userName)
             chatRepository.startClientMode()
         }
     }
     
     fun onConnectedToRoom(roomName: String, userName: String) {
+        preferencesManager.saveUserName(userName)
         _events.value = LobbyEvent.NavigateToChat(roomName, userName, false)
     }
     
@@ -90,6 +103,12 @@ class LobbyViewModel @Inject constructor(
         _events.value = null
     }
     
+    fun saveUserName(name: String) {
+        if (name.isNotBlank()) {
+            preferencesManager.saveUserName(name)
+        }
+    }
+    
     override fun onCleared() {
         super.onCleared()
         // Clean up resources if needed