import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:intl/intl.dart';
import 'package:ristoris/core/credit_score_color.dart';
import '../../../providers/auth_provider.dart';
import '../../widgets/cod_desc_dropdown_item.dart';
import '../../../providers/order_provider.dart';
import '../../../providers/dashboard_provider.dart';
import '../../../providers/database_provider.dart';
import '../../../database/database.dart';
import '../../../core/constants.dart';
import 'selezione_cliente_page.dart';
import 'selezione_articolo_page.dart';

class OrderEditPage extends ConsumerStatefulWidget {
  final int? id;
  final int? idCliente;
  const OrderEditPage({super.key, this.id, this.idCliente});

  @override
  ConsumerState<OrderEditPage> createState() => _OrderEditPageState();
}

class _OrderEditPageState extends ConsumerState<OrderEditPage>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;

  final _noteClienteCtrl = TextEditingController();
  final _noteOrdineCtrl = TextEditingController();
  final _riferimentoCtrl = TextEditingController();

  List<Filiale> _filiali = [];
  List<Listino> _listini = [];
  List<Pagamento> _pagamenti = [];
  Cliente? _cliente;

  int? _selectedFiliale;
  int? _selectedListino;
  int? _selectedPagamento;

  bool _dataLoaded = false;
  bool _readOnly = false;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
    _tabController.addListener(() => setState(() {}));
    WidgetsBinding.instance.addPostFrameCallback((_) => _init());
  }

  @override
  void dispose() {
    _tabController.dispose();
    _noteClienteCtrl.dispose();
    _noteOrdineCtrl.dispose();
    _riferimentoCtrl.dispose();
    super.dispose();
  }

  Future<void> _init() async {
    final agente = ref.read(authProvider).agente;
    if (agente == null) return;

    if (widget.id != null) {
      await ref.read(orderProvider.notifier).loadOrder(widget.id!);
    } else if (widget.idCliente != null) {
      await ref
          .read(orderProvider.notifier)
          .createOrder(agente.idAgente, idCliente: widget.idCliente!);
    } else {
      await ref.read(orderProvider.notifier).createOrder(agente.idAgente);
    }

    final orderState = ref.read(orderProvider);
    final order = orderState.order;
    if (order == null) return;

    if (widget.id != null && order.stato != AppConstants.kStatusNew) {
      _readOnly = true;
    }

    final cli = order.idCliente;
    final clientiDao = ref.read(clientiDaoProvider);
    final filialiDao = ref.read(filialiDaoProvider);
    final listiniDao = ref.read(listiniDaoProvider);
    final pagamentiDao = ref.read(pagamentiDaoProvider);

    if (cli != null) {
      _cliente = await clientiDao.getById(cli);
      _filiali = await filialiDao.getDestinationsForCustomer(cli);
    }
    _listini = await listiniDao.list();
    _pagamenti = await pagamentiDao.searchActive();

    setState(() {
      _selectedFiliale = order.idFiliale;
      _selectedListino = order.idListino ?? _cliente?.idListino;
      _selectedPagamento = order.idPagamento ?? _cliente?.idPagamento;
      _noteClienteCtrl.text = order.noteCliente ?? _cliente?.noteOrdine ?? '';
      _noteOrdineCtrl.text = order.noteOrdine ?? '';
      _riferimentoCtrl.text = order.riferimento ?? '';
      _dataLoaded = true;
    });
  }

  void _aggiungiArticolo() async {
    final order = ref.read(orderProvider).order;
    final dataOrdine = order?.dataOrdine ?? DateTime.now().toIso8601String();

    final result = await Navigator.push<ArticleSelectionResult>(
      context,
      MaterialPageRoute(
        builder: (_) => SelezioneArticoloPage(
          idCliente: _cliente?.idCliente ?? 0,
          dataOrdine: dataOrdine,
          idListinoDefault: _selectedListino,
        ),
      ),
    );

    if (result != null) {
      _addArticleWithDetails(
        art: result.articolo,
        idListino: result.idListino,
        colli: result.colli,
        quantita: result.quantita,
        prezzoLordo: result.prezzoLordo,
        prezzoNetto: result.prezzoNetto,
        sconto1: result.sconto1,
        sconto2: result.sconto2,
        sconto3: result.sconto3,
        sconto4: result.sconto4,
        sconto5: result.sconto5,
      );
    }
  }

  void _addArticleWithDetails({
    required Articolo art,
    required int idListino,
    required double colli,
    required double quantita,
    required double prezzoLordo,
    required double prezzoNetto,
    double? sconto1 = 0,
    double? sconto2 = 0,
    double? sconto3 = 0,
    double? sconto4 = 0,
    double? sconto5 = 0,
  }) {
    ref.read(orderProvider.notifier).addLine(
          VRigheOrdineData(
            idRigaOrdine: 0,
            idOrdine: ref.read(orderProvider).order?.idOrdine ?? 0,
            idArticolo: art.idArticolo,
            idListino: idListino,
            quantita: quantita,
            prezzoLordo: prezzoLordo,
            prezzoNetto: prezzoNetto,
            sconto1: sconto1,
            sconto2: sconto2,
            sconto3: sconto3,
            sconto4: sconto4,
            sconto5: sconto5,
            totale: prezzoNetto * quantita,
            promozione: 0,
            rigaPromozione: 0,
            colli: colli,
            codArticolo: art.codArticolo,
            descrizione: art.descrizione,
          ),
        );
  }

  Future<void> _selezionaCliente() async {
    final agente = ref.read(authProvider).agente;
    if (agente == null) return;
    final cliente = await Navigator.push<Cliente>(
      context,
      MaterialPageRoute(
        builder: (_) => SelezioneClientePage(idAgente: agente.idAgente),
      ),
    );
    if (cliente != null) _onClienteSelezionato(cliente);
  }

  void _onClienteSelezionato(Cliente cliente) async {
    ref.read(orderProvider.notifier).setIdCliente(cliente.idCliente);
    final filialiDao = ref.read(filialiDaoProvider);
    final filiali = await filialiDao.getDestinationsForCustomer(
      cliente.idCliente,
    );
    setState(() {
      _cliente = cliente;
      _selectedFiliale = null;
      _selectedPagamento = cliente.idPagamento;
      _selectedListino = cliente.idListino;
      _filiali = filiali;
      _noteClienteCtrl.text = cliente.noteOrdine ?? '';
    });
  }

  Future<void> _salva() async {
    final notifier = ref.read(orderProvider.notifier);
    notifier.setIdFiliale(_selectedFiliale);
    notifier.setIdListino(_selectedListino);
    notifier.setIdPagamento(_selectedPagamento);
    notifier.setNoteCliente(_noteClienteCtrl.text);
    notifier.setNoteOrdine(_noteOrdineCtrl.text);
    notifier.setRiferimento(_riferimentoCtrl.text);

    await notifier.saveOrder();

    final agente = ref.read(authProvider).agente;
    if (agente != null) {
      ref.invalidate(ordersViewProvider(agente.idAgente));
      ref.invalidate(ordersSearchViewProvider);
      ref.invalidate(orderStatsProvider(agente.idAgente));
      ref.invalidate(dashboardProvider(agente.idAgente));
    }

    if (context.mounted) Navigator.pop(context);
  }

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

    return Scaffold(
      appBar: AppBar(
        title: Text(_readOnly
            ? 'Ordine #${orderState.order?.numeroOrdine}  - Trasmesso'
            : 'Ordine #${orderState.order?.numeroOrdine ?? 'nuovo'}'),
        actions: [
          if (!_readOnly)
            IconButton(
              icon: const Icon(Icons.save),
              onPressed: _salva,
            ),
        ],
        bottom: TabBar(
          controller: _tabController,
          tabs: const [
            Tab(text: 'Testata'),
            Tab(text: 'Righe'),
          ],
        ),
      ),
      body: SafeArea(
        child: orderState.isLoading || !_dataLoaded
            ? const Center(child: CircularProgressIndicator())
            : TabBarView(
                controller: _tabController,
                children: [
                  _buildHeaderTab(theme),
                  _buildLinesTab(theme, orderState),
                ],
              ),
      ),
      floatingActionButton:
          _tabController.index == 1 && _cliente != null && !_readOnly
              ? FloatingActionButton(
                  onPressed: _aggiungiArticolo,
                  child: const Icon(Icons.add),
                )
              : null,
      bottomNavigationBar: _tabController.index == 1
          ? Container(
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: theme.colorScheme.surfaceContainerHighest,
                border: Border(top: BorderSide(color: theme.dividerColor)),
              ),
              child: SafeArea(
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text('Qtà: ${orderState.totQta.toStringAsFixed(1)}'),
                    Text(
                      'Totale: ${NumberFormat.currency(locale: 'it', symbol: '€').format(orderState.totale)}',
                      style: theme.textTheme.titleMedium?.copyWith(
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ],
                ),
              ),
            )
          : null,
    );
  }

  Widget _buildHeaderTab(ThemeData theme) {
    final cs = theme.colorScheme;
    final bgColor = creditScoreBg(_cliente?.creditScoreColor);

    return SingleChildScrollView(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Card(
            elevation: 0,
            color: Colors.white,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(12),
              side: BorderSide(color: cs.outlineVariant),
            ),
            child: Padding(
              padding: const EdgeInsets.all(12),
              child: Row(
                children: [
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          'Cliente',
                          style: TextStyle(
                            fontSize: 12,
                            fontWeight: FontWeight.w600,
                            color: cs.onSurfaceVariant,
                          ),
                        ),
                        const SizedBox(height: 4),
                        if (_cliente != null)
                          Row(
                            children: [
                              Container(
                                padding: const EdgeInsets.symmetric(
                                  horizontal: 8,
                                  vertical: 4,
                                ),
                                decoration: BoxDecoration(
                                  color: bgColor ?? cs.surfaceContainerHighest,
                                  borderRadius: BorderRadius.circular(4),
                                ),
                                child: Text(
                                  _cliente!.codCliente ?? '',
                                  style: TextStyle(
                                    fontSize: 12,
                                    height: 16 / 12,
                                    fontWeight: FontWeight.w500,
                                    color: bgColor != null
                                        ? Colors.white
                                        : cs.onSurfaceVariant,
                                  ),
                                ),
                              ),
                              const SizedBox(width: 8),
                              Expanded(
                                child: Text(
                                  _cliente!.ragioneSociale ?? '',
                                  style: theme.textTheme.bodyMedium?.copyWith(
                                    fontWeight: FontWeight.w600,
                                  ),
                                  maxLines: 1,
                                  overflow: TextOverflow.ellipsis,
                                ),
                              ),
                            ],
                          )
                        else
                          Text(
                            'Nessun cliente selezionato',
                            style: theme.textTheme.bodyMedium?.copyWith(
                              color: cs.onSurfaceVariant,
                            ),
                          ),
                      ],
                    ),
                  ),
                  if (!_readOnly)
                    IconButton(
                      icon: Icon(Icons.search, color: cs.primary),
                      onPressed: _selezionaCliente,
                    ),
                ],
              ),
            ),
          ),
          const SizedBox(height: 16),
          DropdownButtonFormField<int>(
            initialValue: _selectedFiliale,
            decoration: const InputDecoration(labelText: 'Filiale'),
            items: _filiali
                .map(
                  (f) => DropdownMenuItem(
                    value: f.idFiliale,
                    child: CodDescDropdownItem(
                      codice: f.codFiliale,
                      descrizione: f.descrizione,
                    ),
                  ),
                )
                .toList(),
            onChanged:
                _readOnly ? null : (v) => setState(() => _selectedFiliale = v),
          ),
          const SizedBox(height: 16),
          DropdownButtonFormField<int>(
            initialValue: _selectedListino,
            decoration: const InputDecoration(labelText: 'Listino'),
            items: _listini
                .map(
                  (l) => DropdownMenuItem(
                    value: l.idListino,
                    child: CodDescDropdownItem(
                      codice: l.codListino,
                      descrizione: l.descrizione,
                    ),
                  ),
                )
                .toList(),
            onChanged:
                _readOnly ? null : (v) => setState(() => _selectedListino = v),
          ),
          const SizedBox(height: 16),
          DropdownButtonFormField<int>(
            initialValue: _selectedPagamento,
            decoration: const InputDecoration(labelText: 'Pagamento'),
            items: _pagamenti
                .map(
                  (p) => DropdownMenuItem(
                    value: p.idPagamento,
                    child: CodDescDropdownItem(
                      codice: p.codPagamento,
                      descrizione: p.descrizione,
                    ),
                  ),
                )
                .toList(),
            onChanged: _readOnly
                ? null
                : (v) => setState(() => _selectedPagamento = v),
          ),
          const SizedBox(height: 16),
          TextFormField(
            controller: _noteClienteCtrl,
            enabled: !_readOnly,
            decoration: const InputDecoration(
              labelText: 'Note Cliente',
              alignLabelWithHint: true,
            ),
            maxLines: 3,
          ),
          const SizedBox(height: 16),
          TextFormField(
            controller: _noteOrdineCtrl,
            enabled: !_readOnly,
            decoration: const InputDecoration(
              labelText: 'Note Ordine',
              alignLabelWithHint: true,
            ),
            maxLines: 3,
          ),
          const SizedBox(height: 16),
          TextFormField(
            controller: _riferimentoCtrl,
            enabled: !_readOnly,
            decoration: const InputDecoration(labelText: 'Riferimento'),
            maxLines: 1,
          ),
        ],
      ),
    );
  }

  Widget _buildLinesTab(ThemeData theme, OrderState orderState) {
    return Column(
      children: [
        Expanded(
          child: orderState.lines.isEmpty
              ? const Center(child: Text('Nessun articolo'))
              : ListView.builder(
                  itemCount: orderState.lines.length,
                  itemBuilder: (_, i) => _LineCard(
                    line: orderState.lines[i],
                    readOnly: _readOnly,
                    onDelete: () =>
                        ref.read(orderProvider.notifier).removeLine(i),
                    theme: theme,
                  ),
                ),
        ),
      ],
    );
  }
}

class _LineCard extends StatelessWidget {
  final VRigheOrdineData line;
  final bool readOnly;
  final VoidCallback onDelete;
  final ThemeData theme;

  const _LineCard({
    required this.line,
    required this.readOnly,
    required this.onDelete,
    required this.theme,
  });

  @override
  Widget build(BuildContext context) {
    final isPromo = line.rigaPromozione == 1;
    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
      color: isPromo ? Colors.green.shade50 : null,
      child: ListTile(
        title: Text(
          line.codArticolo != null
              ? '${line.codArticolo} - ${line.descrizione ?? ''}'
              : 'Articolo #${line.idArticolo ?? ''}',
          style: TextStyle(fontWeight: isPromo ? FontWeight.bold : null),
        ),
        subtitle: Text(
          'Qtà: ${line.quantita?.toStringAsFixed(1) ?? "0"}  Prezzo: ${line.prezzoNetto?.toStringAsFixed(2) ?? "0,00"}€${line.listino != null ? '  Listino: ${line.listino}' : ''}',
        ),
        trailing: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            if (isPromo)
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                decoration: BoxDecoration(
                  color: Colors.green,
                  borderRadius: BorderRadius.circular(8),
                ),
                child: const Text(
                  'PROMO',
                  style: TextStyle(color: Colors.white, fontSize: 10),
                ),
              ),
            if (!isPromo && !readOnly)
              IconButton(
                icon: const Icon(Icons.delete_outline, size: 20),
                onPressed: onDelete,
              ),
          ],
        ),
      ),
    );
  }
}