Implement showing logout menu option

app/src/main/java/gq/kirmanak/mealie/MainActivity.kt

@@ -1,14 +1,21 @@
 package gq.kirmanak.mealie
 
 import android.os.Bundle
+import android.view.Menu
+import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
 import dagger.hilt.android.AndroidEntryPoint
 import gq.kirmanak.mealie.databinding.MainActivityBinding
+import gq.kirmanak.mealie.ui.auth.AuthenticationViewModel
+import kotlinx.coroutines.flow.collectLatest
 import timber.log.Timber
 
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
     private lateinit var binding: MainActivityBinding
+    private val authViewModel by viewModels<AuthenticationViewModel>()
+    private var isAuthenticated = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -16,5 +23,34 @@ class MainActivity : AppCompatActivity() {
         binding = MainActivityBinding.inflate(layoutInflater)
         setContentView(binding.root)
         setSupportActionBar(binding.toolbar)
+        listenToAuthStatuses()
+    }
+
+    private fun listenToAuthStatuses() {
+        Timber.v("listenToAuthStatuses() called")
+        lifecycleScope.launchWhenCreated {
+            authViewModel.authenticationStatuses().collectLatest {
+                changeAuthStatus(it)
+            }
+        }
+    }
+
+    private fun changeAuthStatus(it: Boolean) {
+        Timber.v("changeAuthStatus() called with: it = $it")
+        if (isAuthenticated == it) return
+        isAuthenticated = it
+        invalidateOptionsMenu()
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        Timber.v("onCreateOptionsMenu() called with: menu = $menu")
+        menuInflater.inflate(R.menu.main_toolbar, menu)
+        return true
+    }
+
+    override fun onPrepareOptionsMenu(menu: Menu): Boolean {
+        Timber.v("onPrepareOptionsMenu() called with: menu = $menu")
+        menu.findItem(R.id.logout).isVisible = isAuthenticated
+        return true
     }
 }