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lib/pages/login.dart

@@ -0,0 +1,88 @@
+import 'package:flutter/material.dart';
+
+import 'package:shoppinglist/main.dart';
+
+class LoginPage extends StatefulWidget {
+  const LoginPage({super.key});
+
+  @override
+  State<LoginPage> createState() => _LoginPageState();
+}
+
+class _LoginPageState extends State<LoginPage> {
+  final TextEditingController _emailCtl = TextEditingController();
+  final TextEditingController _pwCtl = TextEditingController();
+  bool _isRegister = false;
+  bool _loading = false;
+  String? _error;
+
+  Future<void> _submit() async {
+    setState(() {
+      _loading = true;
+      _error = null;
+    });
+    try {
+      final String email = _emailCtl.text.trim();
+      final String password = _pwCtl.text.trim();
+      if (_isRegister) {
+        await apiService.register(email, password);
+      } else {
+        await apiService.login(email, password);
+      }
+    } catch (e) {
+      setState(() => _error = e.toString());
+    } finally {
+      if (mounted) {
+        setState(() => _loading = false);
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text(_isRegister ? 'Registrierung' : 'Login')),
+      body: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            TextField(
+              controller: _emailCtl,
+              decoration: const InputDecoration(labelText: 'Email'),
+              keyboardType: TextInputType.emailAddress,
+            ),
+            const SizedBox(height: 8),
+            TextField(
+              controller: _pwCtl,
+              decoration: const InputDecoration(labelText: 'Passwort'),
+              obscureText: true,
+            ),
+            const SizedBox(height: 20),
+            if (_error != null) ...[
+              Text(
+                _error!,
+                style: TextStyle(color: Theme.of(context).colorScheme.error),
+              ),
+              const SizedBox(height: 12),
+            ],
+            ElevatedButton(
+              onPressed: _loading ? null : _submit,
+              child: _loading
+                  ? const CircularProgressIndicator()
+                  : Text(_isRegister ? 'Registrieren' : 'Einloggen'),
+            ),
+            TextButton(
+              onPressed: _loading
+                  ? null
+                  : () => setState(() => _isRegister = !_isRegister),
+              child: Text(
+                _isRegister ? 'Ich habe schon ein Konto' : 'Neu registrieren',
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}