Fix the firebase login.

app/src/main/java/com/pixelized/rplexicon/data/repository/authentication/FirebaseRepository.kt

@@ -70,7 +70,7 @@ class FirebaseRepository @Inject constructor(
         }
     }.stateIn(
         scope = CoroutineScope(Dispatchers.Default + Job()),
-        started = SharingStarted.Eagerly,
+        started = SharingStarted.Lazily,
         initialValue = emptyMap()
     )
 
@@ -102,7 +102,7 @@ class FirebaseRepository @Inject constructor(
         }
     }.stateIn(
         scope = CoroutineScope(Dispatchers.Default + Job()),
-        started = SharingStarted.Eagerly,
+        started = SharingStarted.Lazily,
         initialValue = NetworkThrowMap(),
     )
 

app/src/main/java/com/pixelized/rplexicon/ui/screens/authentication/AuthenticationViewModel.kt

@@ -7,10 +7,16 @@ import androidx.credentials.GetCredentialRequest
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.google.android.libraries.identity.googleid.GetSignInWithGoogleOption
+import com.google.android.libraries.identity.googleid.GoogleIdTokenCredential
+import com.google.firebase.auth.GoogleAuthProvider
+import com.google.firebase.auth.ktx.auth
+import com.google.firebase.ktx.Firebase
 import com.pixelized.rplexicon.R
+import com.pixelized.rplexicon.data.repository.authentication.FirebaseRepository
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.tasks.await
 import kotlinx.coroutines.withContext
 import javax.inject.Inject
 
@@ -18,7 +24,9 @@ import javax.inject.Inject
  * https://developer.android.com/identity/sign-in/credential-manager-siwg
  */
 @HiltViewModel
-class AuthenticationViewModel @Inject constructor() : ViewModel() {
+class AuthenticationViewModel @Inject constructor(
+    private val firebaseRepository: FirebaseRepository,
+) : ViewModel() {
 
     val authenticationState = mutableStateOf<AuthenticationStateUio>(
         AuthenticationStateUio.Initial
@@ -36,14 +44,38 @@ class AuthenticationViewModel @Inject constructor() : ViewModel() {
             .build()
 
         viewModelScope.launch(Dispatchers.IO) {
-            withContext(Dispatchers.Main) {
-                authenticationState.value = AuthenticationStateUio.Initial
-            }
             try {
-                credentialManager.getCredential(
+                withContext(Dispatchers.Main) {
+                    authenticationState.value = AuthenticationStateUio.Progress
+                }
+                // login to goole.
+                val result = credentialManager.getCredential(
                     request = request,
                     context = activity,
                 )
+                // extract the token Id from the credential
+                val tokenIdCredential = GoogleIdTokenCredential.createFrom(
+                    data = result.credential.data,
+                )
+                // wrap the tokenId inside a google credential
+                val googleIdCredential = GoogleAuthProvider.getCredential(
+                    tokenIdCredential.idToken,
+                    null,
+                )
+                // use that credential to login to firebase.
+                val firebase = Firebase.auth.signInWithCredential(
+                    googleIdCredential
+                ).await()
+                // throw if firebase login fail.
+                if (firebase.credential == null) {
+                    error("Fail to authenticate to firebase")
+                }
+                // Launch a preload collect to warm the repository flow.
+                // Can't use Eager for that because of auth permission.
+                launch(Dispatchers.Default) {
+                    firebaseRepository.getAlterationStatus().collect { }
+                }
+                // propagate the auth success.
                 withContext(Dispatchers.Main) {
                     authenticationState.value = AuthenticationStateUio.Success
                 }