[fenix] Closes https://github.com/mozilla-mobile/fenix/issues/15882: check for account state abnormalities after account manager is ready

app/src/main/java/org/mozilla/fenix/components/AccountAbnormalities.kt

@@ -89,17 +89,7 @@ class AccountAbnormalities(
         hadAccountPrior = prefPair.second
     }
 
-    /**
-     * Once [accountManager] is initialized, queries it to detect abnormal account states.
-     * Call this right after running [FxaAccountManager.initAsync].
-     *
-     * @param accountManager An instance of [FxaAccountManager].
-     * @param initResult A deferred result of initializing [accountManager].
-     * @return A [Unit] deferred, resolved once [initResult] is resolved and state is processed for abnormalities.
-     */
-    fun accountManagerStarted(
-        accountManager: FxaAccountManager
-    ) {
+    override fun onReady(authenticatedAccount: OAuthAccount?) {
         check(!accountManagerConfigured) { "accountManagerStarted called twice" }
         accountManagerConfigured = true
 
@@ -110,7 +100,7 @@ class AccountAbnormalities(
         // account. This works because our account state is persisted in the application's
         // directory, same as SharedPreferences. If user clears application data, both the
         // fxa state and our flag will be removed.
-        val hasAccountNow = accountManager.authenticatedAccount() != null
+        val hasAccountNow = authenticatedAccount != null
         if (hadAccountPrior && !hasAccountNow) {
             prefs.edit().putBoolean(KEY_HAS_ACCOUNT, false).apply()
 

app/src/main/java/org/mozilla/fenix/components/BackgroundServices.kt

@@ -177,6 +177,8 @@ class BackgroundServices(
         // unexpected logouts.
         accountManager.register(accountAbnormalities)
 
+        accountManager.register(AccountManagerReadyObserver(accountManagerAvailableQueue))
+
         // Enable push if it's configured.
         push.feature?.let { autoPushFeature ->
             FxaPushSupportFeature(context, accountManager, autoPushFeature, crashReporter)
@@ -190,10 +192,7 @@ class BackgroundServices(
 
         MainScope().launch {
             accountManager.start()
-            accountAbnormalities.accountManagerStarted(accountManager)
         }
-    }.also {
-        accountManagerAvailableQueue.ready()
     }
 
     /**
@@ -204,6 +203,14 @@ class BackgroundServices(
     }
 }
 
+private class AccountManagerReadyObserver(
+    private val accountManagerAvailableQueue: RunWhenReadyQueue
+) : AccountObserver {
+    override fun onReady(authenticatedAccount: OAuthAccount?) {
+        accountManagerAvailableQueue.ready()
+    }
+}
+
 @VisibleForTesting(otherwise = PRIVATE)
 internal class TelemetryAccountObserver(
     private val settings: Settings,