import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../../providers/auth_provider.dart';
import '../../../providers/database_provider.dart';

class SyncSettingsPage extends ConsumerStatefulWidget {
  const SyncSettingsPage({super.key});

  @override
  ConsumerState<SyncSettingsPage> createState() => _SyncSettingsPageState();
}

class _SyncSettingsPageState extends ConsumerState<SyncSettingsPage> {
  final _urlCtrl = TextEditingController();
  final _formKey = GlobalKey<FormState>();
  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    _loadUrl();
  }

  Future<void> _loadUrl() async {
    final url = await ref.read(parametriDaoProvider).read('URL');
    if (url != null && url.isNotEmpty) {
      _urlCtrl.text = url;
    }
  }

  @override
  void dispose() {
    _urlCtrl.dispose();
    super.dispose();
  }

  Future<void> _saveUrl() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _isLoading = true);
    try {
      await ref.read(parametriDaoProvider).set('URL', _urlCtrl.text);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('URL salvato con successo')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Errore: $e')),
        );
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  Future<void> _resetArchives() async {
    final confirm = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Azzeramento archivi'),
        content: const Text('Cancellare tutti i dati archiviati? Le impostazioni e il codice agente rimarranno salvati.'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('Annulla')),
          FilledButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('Cancella')),
        ],
      ),
    );
    if (confirm != true) return;

    setState(() => _isLoading = true);
    try {
      final db = ref.read(databaseProvider);
      await db.transaction(() async {
        await db.delete(db.articoli).go();
        await db.delete(db.clienti).go();
        await db.delete(db.ordini).go();
        await db.delete(db.righeOrdine).go();
        await db.delete(db.filiali).go();
        await db.delete(db.listini).go();
        await db.delete(db.listiniArticolo).go();
        await db.delete(db.listiniCliente).go();
        await db.delete(db.sconti).go();
        await db.delete(db.scontiCliente).go();
        await db.delete(db.pagamenti).go();
        await db.delete(db.tabelle).go();
        await db.delete(db.promozioni).go();
        await db.delete(db.promoArticoli).go();
        await db.delete(db.promoListini).go();
        await db.delete(db.promoOmaggi).go();
        await db.delete(db.clientiAgente).go();
        await db.delete(db.scadenze).go();
        await db.delete(db.statisticheVendita).go();
      });

      if (!mounted) return;

      final deleteAgent = await showDialog<bool>(
        context: context,
        builder: (ctx) => AlertDialog(
          title: const Text('Cancellazione codice agente'),
          content: const Text('Vuoi cancellare anche il codice agente? Dovrai riconfigurare l\'app da capo.'),
          actions: [
            TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('No')),
            FilledButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('Sì, cancella')),
          ],
        ),
      );

      if (deleteAgent == true) {
        await db.delete(db.agenti).go();
        ref.read(authProvider.notifier).resetToInit();
        if (mounted) context.go('/init');
      } else {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Archivi azzerati')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Errore durante l\'azzeramento: $e')),
        );
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Scaffold(
      appBar: AppBar(title: const Text('Impostazioni')),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 400),
            child: Form(
              key: _formKey,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  Icon(Icons.cloud, size: 64, color: theme.colorScheme.primary),
                  const SizedBox(height: 16),
                  Text(
                    'Connessione',
                    textAlign: TextAlign.center,
                    style: theme.textTheme.titleLarge,
                  ),
                  const SizedBox(height: 24),
                  TextFormField(
                    controller: _urlCtrl,
                    decoration: const InputDecoration(
                      labelText: 'URL Backend',
                      prefixIcon: Icon(Icons.link),
                    ),
                    validator: (v) => v == null || v.isEmpty ? 'Campo obbligatorio' : null,
                  ),
                  const SizedBox(height: 16),
                  FilledButton.icon(
                    onPressed: _isLoading ? null : _saveUrl,
                    icon: const Icon(Icons.save),
                    label: const Text('Salva URL'),
                  ),
                  const SizedBox(height: 40),
                  const Divider(),
                  const SizedBox(height: 16),
                  Icon(Icons.delete_sweep, size: 48, color: theme.colorScheme.error),
                  const SizedBox(height: 8),
                  Text(
                    'Azzeramento dati',
                    textAlign: TextAlign.center,
                    style: theme.textTheme.titleMedium,
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Cancella tutti i dati archiviati (clienti, ordini, articoli, ecc.)',
                    textAlign: TextAlign.center,
                    style: theme.textTheme.bodySmall?.copyWith(color: theme.colorScheme.outline),
                  ),
                  const SizedBox(height: 16),
                  OutlinedButton.icon(
                    onPressed: _isLoading ? null : _resetArchives,
                    style: OutlinedButton.styleFrom(foregroundColor: theme.colorScheme.error),
                    icon: const Icon(Icons.delete),
                    label: const Text('Azzera Archivi'),
                  ),
                  if (_isLoading) ...[
                    const SizedBox(height: 16),
                    const LinearProgressIndicator(),
                  ],
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}