basic api access, state managment etc

flutter/lib/pages/account/root.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:simplecloudnotifier/pages/account/login.dart';
+
+import '../../state/user_account.dart';
+import 'choose_auth.dart';
+
+class AccountRootPage extends StatefulWidget {
+  const AccountRootPage({super.key});
+
+  @override
+  State<AccountRootPage> createState() => _AccountRootPageState();
+}
+
+enum _SubPage { chooseAuth, login, main }
+
+class _AccountRootPageState extends State<AccountRootPage> {
+  late _SubPage _page;
+
+  @override
+  void initState() {
+    super.initState();
+
+    var prov = Provider.of<UserAccount>(context, listen: false);
+
+    _page = (prov.auth != null) ? _SubPage.main : _SubPage.chooseAuth;
+
+    prov.addListener(_onAuthStateChanged);
+  }
+
+  @override
+  void dispose() {
+    Provider.of<UserAccount>(context, listen: false).removeListener(_onAuthStateChanged);
+    super.dispose();
+  }
+
+  void _onAuthStateChanged() {
+    if (Provider.of<UserAccount>(context, listen: false).auth != null && _page != _SubPage.main) {
+      setState(() {
+        _page = _SubPage.main;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Consumer<UserAccount>(
+      builder: (context, acc, child) {
+        switch (_page) {
+          case _SubPage.main:
+            return const Center(
+              child: Text(
+                'Logged In',
+                style: TextStyle(fontSize: 24),
+              ),
+            );
+          case _SubPage.chooseAuth:
+            return AccountChoosePage(
+              onLogin: () => setState(() {
+                _page = _SubPage.login;
+              }),
+              onCreateAccount: () => setState(() {
+                //TODO
+              }),
+            );
+          case _SubPage.login:
+            return const AccountLoginPage();
+        }
+      },
+    );
+  }
+}