import 'package:flutter/material.dart';

class PantallaInicioSesion extends StatefulWidget {
  @override
  _PantallaInicioSesionState createState() => _PantallaInicioSesionState();
}

class _PantallaInicioSesionState extends State<PantallaInicioSesion> {
  final _formKey = GlobalKey<FormState>();
  final TextEditingController _usuarioController = TextEditingController();
  final TextEditingController _contrasenaController = TextEditingController();

  void _iniciarSesion() {
    if (_formKey.currentState!.validate()) {
      Navigator.pushReplacementNamed(context, '/categorias');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Inicio de Sesión'),
      ),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              TextFormField(
                controller: _usuarioController,
                decoration: InputDecoration(labelText: 'Usuario'),
                validator: (value) {
                  if (value!.isEmpty) {
                    return 'Por favor ingrese su usuario';
                  }
                  return null;
                },
              ),
              TextFormField(
                controller: _contrasenaController,
                decoration: InputDecoration(labelText: 'Contraseña'),
                obscureText: true,
                validator: (value) {
                  if (value!.isEmpty) {
                    return 'Por favor ingrese su contraseña';
                  }
                  return null;
                },
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: _iniciarSesion,
                child: Text('Iniciar Sesión'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}