import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flux/features/tickets/blocs/ticket_shipping_cubit.dart';
import 'package:flux/features/tickets/models/ticket_model.dart';

class TicketShippingModal extends StatefulWidget {
  final List<String> ticketIds;

  const TicketShippingModal({super.key, required this.ticketIds});

  @override
  State<TicketShippingModal> createState() => _TicketShippingModalState();
}

class _TicketShippingModalState extends State<TicketShippingModal> {
  final _formKey = GlobalKey<FormState>();

  @override
  void initState() {
    super.initState();
    // Appena si apre la modale, carichiamo la lista dei laboratori
    context.read<TicketShippingCubit>().loadRepairCenters();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom + 24,
        top: 24,
        left: 24,
        right: 24,
      ),
      decoration: BoxDecoration(
        color: Theme.of(context).colorScheme.surface,
        borderRadius: const BorderRadius.vertical(top: Radius.circular(28)),
      ),
      child: BlocConsumer<TicketShippingCubit, TicketShippingState>(
        listener: (context, state) {
          if (state.status == TicketShippingStatus.success) {
            final provider = state.availableProviders.firstWhere(
              (p) => p.id == state.document.providerId,
            );
            final location = state.availableLocations.firstWhere(
              (l) => l.id == state.document.destinationLocationId,
            );

            // Creiamo un Dart Record elegante e lo "spariamo" fuori
            final ddtData = (
              document: state.document,
              provider: provider,
              location: location,
            );

            Navigator.pop(context, ddtData);
          }
          if (state.status == TicketShippingStatus.failure &&
              state.errorMessage != null) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(
                content: Text(state.errorMessage!),
                backgroundColor: Colors.red,
              ),
            );
          }
        },
        builder: (context, state) {
          if (state.status == TicketShippingStatus.loading &&
              state.availableProviders.isEmpty) {
            return const SizedBox(
              height: 200,
              child: Center(child: CircularProgressIndicator()),
            );
          }

          final doc =
              state.document; // Scorciatoia comoda per il nostro modello

          return Form(
            key: _formKey,
            child: SingleChildScrollView(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                mainAxisSize: MainAxisSize.min,
                children: [
                  _buildHeader(context, state),
                  const Divider(height: 32),

                  // 1. DESTINAZIONE
                  _buildSectionTitle(Icons.business, "Destinatario"),
                  _buildProviderDropdown(context, state),
                  const SizedBox(height: 16),
                  if (doc.providerId.isNotEmpty)
                    _buildLocationDropdown(context, state),

                  const SizedBox(height: 24),

                  // 2. DATI DOCUMENTO
                  _buildSectionTitle(Icons.description, "Dati Documento"),
                  _buildNumberingSection(context, state),
                  const SizedBox(height: 16),
                  _buildDatePicker(context, state),

                  const SizedBox(height: 24),

                  // 3. DETTAGLI MERCE E TRASPORTO
                  _buildSectionTitle(Icons.inventory_2, "Dettagli Trasporto"),
                  _buildShippingDetails(context, state),

                  const SizedBox(height: 32),

                  // BOTTONE CONFERMA
                  SizedBox(
                    width: double.infinity,
                    height: 54,
                    child: FilledButton.icon(
                      onPressed: state.status == TicketShippingStatus.loading
                          ? null
                          : () {
                              if (_formKey.currentState!.validate()) {
                                // Assicurati che lo stato qui coincida con l'Enum del tuo TicketStatus
                                context
                                    .read<TicketShippingCubit>()
                                    .confirmShipment(
                                      newTicketStatus:
                                          TicketStatus.waitingForReturn,
                                    );
                              }
                            },
                      icon: state.status == TicketShippingStatus.loading
                          ? const SizedBox(
                              width: 20,
                              height: 20,
                              child: CircularProgressIndicator(
                                strokeWidth: 2,
                                color: Colors.white,
                              ),
                            )
                          : const Icon(Icons.local_shipping),
                      label: const Text(
                        "GENERA DDT E SPEDISCI",
                        style: TextStyle(fontWeight: FontWeight.bold),
                      ),
                    ),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }

  Widget _buildHeader(BuildContext context, TicketShippingState state) {
    return Row(
      children: [
        CircleAvatar(
          backgroundColor: Theme.of(context).colorScheme.primaryContainer,
          child: Icon(
            Icons.share_location,
            color: Theme.of(context).colorScheme.primary,
          ),
        ),
        const SizedBox(width: 16),
        Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              "Spedizione Multipla",
              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
            ),
            Text(
              "${widget.ticketIds.length} ticket pronti per il laboratorio",
              style: const TextStyle(color: Colors.grey),
            ),
          ],
        ),
      ],
    );
  }

  Widget _buildProviderDropdown(
    BuildContext context,
    TicketShippingState state,
  ) {
    return DropdownButtonFormField<String>(
      initialValue: state.document.providerId.isEmpty
          ? null
          : state.document.providerId,
      decoration: const InputDecoration(
        labelText: "Seleziona Centro Riparazioni",
        prefixIcon: Icon(Icons.store),
      ),
      items: state.availableProviders
          .map((p) => DropdownMenuItem(value: p.id, child: Text(p.name)))
          .toList(),
      onChanged: (val) => val != null
          ? context.read<TicketShippingCubit>().selectProvider(val)
          : null,
      validator: (v) => v == null || v.isEmpty ? 'Campo obbligatorio' : null,
    );
  }

  Widget _buildLocationDropdown(
    BuildContext context,
    TicketShippingState state,
  ) {
    return DropdownButtonFormField<String>(
      initialValue: state.document.destinationLocationId.isEmpty
          ? null
          : state.document.destinationLocationId,
      decoration: const InputDecoration(
        labelText: "Sede di destinazione",
        prefixIcon: Icon(Icons.location_on),
      ),
      items: state.availableLocations
          .map((l) => DropdownMenuItem(value: l.id, child: Text(l.name)))
          .toList(),
      onChanged: (val) => val != null
          ? context.read<TicketShippingCubit>().selectLocation(val)
          : null,
      validator: (v) => v == null || v.isEmpty ? 'Campo obbligatorio' : null,
    );
  }

  Widget _buildNumberingSection(
    BuildContext context,
    TicketShippingState state,
  ) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.end,
      children: [
        Expanded(
          flex: 2,
          child: state.isAutoNumber
              ? const Text('Numero auto-generato alla conferma')
              : TextFormField(
                  // Key è fondamentale per far aggiornare il campo quando cambia da auto a manuale
                  key: ValueKey('docNum_${state.isAutoNumber}'),
                  initialValue: state.document.docNumber,
                  readOnly: state.isAutoNumber, // Bloccato se automatico
                  decoration: InputDecoration(
                    labelText: "Numero DDT",
                    helperText: state.isAutoNumber
                        ? "Generato automaticamente"
                        : "Inserimento manuale",
                  ),
                  onChanged: (val) => context
                      .read<TicketShippingCubit>()
                      .updateDocument(docNumber: val),
                ),
        ),
        const SizedBox(width: 16),
        // Switch per modalità automatica
        Column(
          children: [
            const Text(
              "Auto",
              style: TextStyle(fontSize: 10, fontWeight: FontWeight.bold),
            ),
            Switch(
              value: state.isAutoNumber,
              onChanged: (val) =>
                  context.read<TicketShippingCubit>().toggleAutoNumber(val),
            ),
          ],
        ),
      ],
    );
  }

  Widget _buildDatePicker(BuildContext context, TicketShippingState state) {
    final date = state.document.docDate;
    return ListTile(
      contentPadding: EdgeInsets.zero,
      title: const Text("Data Documento"),
      subtitle: Text(
        "${date.day.toString().padLeft(2, '0')}/${date.month.toString().padLeft(2, '0')}/${date.year}",
      ),
      trailing: const Icon(Icons.calendar_month),
      onTap: () async {
        final ticketShippingCubit = context.read<TicketShippingCubit>();
        final newDate = await showDatePicker(
          context: context,
          initialDate: date,
          firstDate: DateTime.now().subtract(const Duration(days: 365)),
          lastDate: DateTime.now().add(const Duration(days: 365)),
        );
        if (newDate != null) {
          ticketShippingCubit.updateDocument(docDate: newDate);
        }
      },
    );
  }

  Widget _buildShippingDetails(
    BuildContext context,
    TicketShippingState state,
  ) {
    return Column(
      children: [
        Row(
          children: [
            Expanded(
              child: TextFormField(
                initialValue: state.document.packageCount.toString(),
                decoration: const InputDecoration(labelText: "N. Colli"),
                keyboardType: TextInputType.number,
                onChanged: (val) => context
                    .read<TicketShippingCubit>()
                    .updateDocument(packageCount: int.tryParse(val) ?? 1),
              ),
            ),
            const SizedBox(width: 16),
            Expanded(
              child: TextFormField(
                initialValue: state.document.weight?.toString() ?? '',
                decoration: const InputDecoration(
                  labelText: "Peso",
                  suffixText: "Kg",
                ),
                keyboardType: const TextInputType.numberWithOptions(
                  decimal: true,
                ),
                onChanged: (val) => context
                    .read<TicketShippingCubit>()
                    .updateDocument(weight: double.tryParse(val)),
              ),
            ),
          ],
        ),
        const SizedBox(height: 16),
        TextFormField(
          initialValue: state.document.shippingReason,
          decoration: const InputDecoration(labelText: "Causale Trasporto"),
          onChanged: (val) => context
              .read<TicketShippingCubit>()
              .updateDocument(shippingReason: val),
        ),
        const SizedBox(height: 16),
        TextFormField(
          initialValue: state.document.notes ?? '',
          decoration: const InputDecoration(
            labelText: "Aspetto Beni (es. Scatola, Busta)",
          ),
          onChanged: (val) =>
              context.read<TicketShippingCubit>().updateDocument(notes: val),
        ),
      ],
    );
  }

  Widget _buildSectionTitle(IconData icon, String title) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 12.0),
      child: Row(
        children: [
          Icon(icon, size: 18, color: Colors.grey),
          const SizedBox(width: 8),
          Text(
            title.toUpperCase(),
            style: const TextStyle(
              fontSize: 12,
              fontWeight: FontWeight.bold,
              color: Colors.grey,
              letterSpacing: 1.1,
            ),
          ),
        ],
      ),
    );
  }
}