import 'package:flutter/material.dart';
import 'package:notas/widgets/search_app_bar.dart';

class SettingsScreen extends StatefulWidget {
  const SettingsScreen({
    super.key,
    required this.onDeleteAllData,
    required this.onBackToHome,
  });

  final Future<void> Function() onDeleteAllData;
  final VoidCallback onBackToHome;

  @override
  State<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State<SettingsScreen> {
  bool _isBusy = false;

  Future<void> _confirmAndDeleteAll() async {
    final bool? confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Borrar todos los datos'),
        content: const Text('¿Estás seguro? Esta acción eliminará la base de datos local y la clave de cifrado. No se podrá recuperar.'),
        actions: [
          TextButton(onPressed: () => Navigator.of(context).pop(false), child: const Text('Cancelar')),
          TextButton(onPressed: () => Navigator.of(context).pop(true), child: const Text('Borrar', style: TextStyle(color: Colors.red))),
        ],
      ),
    );

    if (confirmed != true) return;

    setState(() {
      _isBusy = true;
    });

    try {
      await widget.onDeleteAllData();

      if (!mounted) return;

      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Todos los datos locales han sido eliminados.')),
      );
    } catch (error) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Error al borrar los datos: $error')),
      );
    } finally {
      if (!mounted) return;
      setState(() {
        _isBusy = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            colors: [
              Color(0xFF191A1D),
              Color(0xFF222326),
              Color(0xFF101114),
            ],
            begin: Alignment.topLeft,
            end: Alignment.bottomRight,
          ),
        ),
        child: SafeArea(
          child: Column(
            children: [
              SearchAppBar(
                onLeadingPressed: widget.onBackToHome,
                leadingIcon: Icons.arrow_back,
                leadingTooltip: 'Atrás',
                showSearch: false,
                titleText: 'Configuración',
              ),
              Expanded(
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      ElevatedButton.icon(
                        style: ElevatedButton.styleFrom(backgroundColor: Colors.redAccent),
                        onPressed: _isBusy ? null : _confirmAndDeleteAll,
                        icon: _isBusy ? const SizedBox(width: 16, height: 16, child: CircularProgressIndicator(strokeWidth: 2)) : const Icon(Icons.delete_forever),
                        label: const Text('Borrar todos los datos'),
                      ),
                      const SizedBox(height: 16),
                      const Text('Esto cerrará el vault actual y eliminará la base de datos local junto con la clave de cifrado.'),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}