Fix pressing back on AuthenticationFragment

If login request isn't disabled when user presses
back then they might get navigated back to
authentication again.

app/src/main/java/gq/kirmanak/mealient/ui/auth/AuthenticationFragment.kt

@@ -13,7 +13,8 @@ import dagger.hilt.android.AndroidEntryPoint
 import gq.kirmanak.mealient.R
 import gq.kirmanak.mealient.data.network.NetworkError.Unauthorized
 import gq.kirmanak.mealient.databinding.FragmentAuthenticationBinding
-import gq.kirmanak.mealient.ui.checkIfInputIsEmpty
+import gq.kirmanak.mealient.extensions.checkIfInputIsEmpty
+import gq.kirmanak.mealient.extensions.executeOnceOnBackPressed
 import timber.log.Timber
 
 @AndroidEntryPoint
@@ -28,6 +29,7 @@ class AuthenticationFragment : Fragment(R.layout.fragment_authentication) {
         super.onCreate(savedInstanceState)
         Timber.v("onCreate() called with: savedInstanceState = $savedInstanceState")
         authStatuses.observe(this, ::onAuthStatusChange)
+        executeOnceOnBackPressed { viewModel.disableLoginRequest() }
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

app/src/main/java/gq/kirmanak/mealient/ui/auth/AuthenticationViewModel.kt

@@ -45,8 +45,17 @@ class AuthenticationViewModel @Inject constructor(
         }
     }
 
-    fun login() {
-        Timber.v("login() called")
-        viewModelScope.launch { loginRequestsFlow.emit(true) }
+    fun enableLoginRequest() {
+        Timber.v("enableLoginRequest() called")
+        updateIsLoginRequested(true)
+    }
+
+    fun disableLoginRequest() {
+        Timber.v("disableLoginRequest() called")
+        updateIsLoginRequested(false)
+    }
+
+    private fun updateIsLoginRequested(isRequested: Boolean) {
+        viewModelScope.launch { loginRequestsFlow.emit(isRequested) }
     }
 }