import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../services/auth_service.dart';

class LoginScreen extends StatefulWidget {
  @override
  _LoginScreenState createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  final _userCtrl = TextEditingController();
  final _pwCtrl = TextEditingController();
  bool _loading = false;

  @override
  Widget build(BuildContext context) {
    final auth = Provider.of<AuthService>(context);
    // Auto-redirect if already logged in
    if (auth.token != null) {
      Future.microtask(() => Navigator.pushReplacementNamed(context, '/profile'));
    }
    return Scaffold(
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text('Bejelentkezés', style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold)),
              SizedBox(height: 16),
              TextField(controller: _userCtrl, decoration: InputDecoration(labelText: 'Felhasználó')),
              SizedBox(height: 8),
              TextField(controller: _pwCtrl, decoration: InputDecoration(labelText: 'Jelszó'), obscureText: true),
              SizedBox(height: 16),
              ElevatedButton(
                onPressed: _loading ? null : () async {
                  final username = _userCtrl.text.trim();
                  final password = _pwCtrl.text.trim();
                  if (username.isEmpty || password.isEmpty) {
                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Kérlek add meg a felhasználónevet és jelszót')));
                    return;
                  }
                  setState(() { _loading = true; });
                  final ok = await auth.login(username, password);
                  setState(() { _loading = false; });
                  if (ok) Navigator.pushReplacementNamed(context, '/home');
                  else ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Bejelentkezés sikertelen')));
                },
                child: _loading ? SizedBox(height: 16, width: 16, child: CircularProgressIndicator(strokeWidth: 2)) : Text('Bejelentkezés'),
              )
            ],
          ),
        ),
      ),
    );
  }
}