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

class TicketListScreen extends StatefulWidget {
  const TicketListScreen({super.key});

  @override
  State<TicketListScreen> createState() => _TicketListScreenState();
}

class _TicketListScreenState extends State<TicketListScreen> {
  final ScrollController _scrollController = ScrollController();
  final TextEditingController _searchController = TextEditingController();

  @override
  void initState() {
    super.initState();
    // INFINITY SCROLL: Quando arriviamo quasi in fondo, chiediamo altri ticket
    _scrollController.addListener(() {
      if (_scrollController.position.pixels >=
          _scrollController.position.maxScrollExtent - 200) {
        context.read<TicketListCubit>().fetchTickets();
      }
    });
  }

  @override
  void dispose() {
    _scrollController.dispose();
    _searchController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Assistenza & Riparazioni'),
        actions: [
          // Tasto per filtri avanzati (Data, Staff, Tipo) -> Da fare in un BottomSheet!
          IconButton(
            icon: const Icon(Icons.filter_list),
            onPressed: () {
              // TODO: Aprire BottomSheet filtri avanzati
            },
          ),
        ],
      ),
      body: Column(
        children: [
          // 1. BARRA DI RICERCA
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextField(
              controller: _searchController,
              decoration: InputDecoration(
                hintText: 'Cerca per nome cliente...',
                prefixIcon: const Icon(Icons.search),
                suffixIcon: IconButton(
                  icon: const Icon(Icons.clear),
                  onPressed: () {
                    _searchController.clear();
                    context.read<TicketListCubit>().updateFilters(
                      clearSearch: true,
                    );
                  },
                ),
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(12),
                ),
              ),
              onSubmitted: (value) {
                context.read<TicketListCubit>().updateFilters(
                  searchTerm: value,
                );
              },
            ),
          ),

          // 2. FILTRI RAPIDI PER STATO (CHIPS)
          BlocBuilder<TicketListCubit, TicketListState>(
            buildWhen: (previous, current) =>
                previous.statusFilter != current.statusFilter,
            builder: (context, state) {
              return SizedBox(
                height: 50,
                child: ListView(
                  scrollDirection: Axis.horizontal,
                  padding: const EdgeInsets.symmetric(horizontal: 8.0),
                  children: [
                    _buildStatusChip(context, state, null, 'Tutti'),
                    ...TicketStatus.values.map(
                      (status) => _buildStatusChip(
                        context,
                        state,
                        status,
                        status.displayValue,
                      ),
                    ),
                  ],
                ),
              );
            },
          ),
          const Divider(),

          // 3. LA LISTA DEI TICKET
          Expanded(
            child: BlocBuilder<TicketListCubit, TicketListState>(
              builder: (context, state) {
                if (state.isLoading && state.tickets.isEmpty) {
                  return const Center(child: CircularProgressIndicator());
                }

                if (state.tickets.isEmpty) {
                  return const Center(child: Text('Nessun ticket trovato.'));
                }

                return ListView.builder(
                  controller: _scrollController,
                  itemCount: state.hasReachedMax
                      ? state.tickets.length
                      : state.tickets.length + 1,
                  itemBuilder: (context, index) {
                    // Se siamo all'ultimo elemento e non abbiamo raggiunto il max, mostriamo il loader
                    if (index >= state.tickets.length) {
                      return const Center(
                        child: Padding(
                          padding: EdgeInsets.all(16.0),
                          child: CircularProgressIndicator(),
                        ),
                      );
                    }

                    final ticket = state.tickets[index];
                    return _TicketCard(ticket: ticket);
                  },
                );
              },
            ),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () {
          // TODO: Navigare alla creazione di un nuovo ticket
        },
        icon: const Icon(Icons.add),
        label: const Text('Nuovo Ticket'),
      ),
    );
  }

  // Widget di supporto per creare le Chip di filtro
  Widget _buildStatusChip(
    BuildContext context,
    TicketListState state,
    TicketStatus? status,
    String label,
  ) {
    final isSelected = state.statusFilter == status;
    return Padding(
      padding: const EdgeInsets.only(right: 8.0),
      child: ChoiceChip(
        label: Text(label),
        selected: isSelected,
        selectedColor:
            status?.color.withValues(alpha: 0.2) ??
            Colors.blue.withValues(alpha: 0.2),
        onSelected: (selected) {
          context.read<TicketListCubit>().updateFilters(
            statusFilter: selected ? status : null,
            clearStatus: !selected && status != null,
          );
        },
      ),
    );
  }
}

// ---------------------------------------------------------
// LA CARD DEL TICKET (Il "Colpo d'Occhio")
// ---------------------------------------------------------
class _TicketCard extends StatelessWidget {
  final TicketModel ticket;

  const _TicketCard({required this.ticket});

  @override
  Widget build(BuildContext context) {
    final statusColor = ticket.status?.color ?? Colors.grey;
    final statusIcon = ticket.status?.icon ?? Icons.help_outline;

    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 4.0),
      clipBehavior: Clip
          .antiAlias, // Serve per tagliare il container laterale con gli angoli della card
      child: IntrinsicHeight(
        // Serve per far sì che il container laterale prenda tutta l'altezza
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // LA STRISCIA COLORATA LATERALE
            Container(width: 6, color: statusColor),
            Expanded(
              child: ListTile(
                contentPadding: const EdgeInsets.symmetric(
                  horizontal: 16.0,
                  vertical: 8.0,
                ),
                title: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Expanded(
                      child: Text(
                        ticket.customerName ?? 'Cliente Sconosciuto',
                        style: const TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 16,
                        ),
                        overflow: TextOverflow.ellipsis,
                      ),
                    ),
                    // IL BADGE DELLO STATO
                    Container(
                      padding: const EdgeInsets.symmetric(
                        horizontal: 8,
                        vertical: 4,
                      ),
                      decoration: BoxDecoration(
                        color: statusColor.withValues(alpha: 0.1),
                        borderRadius: BorderRadius.circular(12),
                        border: Border.all(
                          color: statusColor.withValues(alpha: 0.5),
                        ),
                      ),
                      child: Row(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          Icon(statusIcon, size: 14, color: statusColor),
                          const SizedBox(width: 4),
                          Text(
                            ticket.status?.displayValue ?? 'N/D',
                            style: TextStyle(
                              fontSize: 12,
                              color: statusColor,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
                subtitle: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const SizedBox(height: 4),
                    // MODELLO O TIPO DI INTERVENTO
                    Text(
                      ticket.targetModelName ?? ticket.ticketType.displayValue,
                      style: const TextStyle(fontWeight: FontWeight.w500),
                    ),
                    const SizedBox(height: 4),
                    // DATA CREAZIONE (Es: 04/05/2026)
                    Text(
                      ticket.createdAt != null
                          ? 'Creato il: ${ticket.createdAt!.day}/${ticket.createdAt!.month}/${ticket.createdAt!.year}'
                          : '',
                      style: TextStyle(
                        color: Colors.grey.shade600,
                        fontSize: 12,
                      ),
                    ),
                  ],
                ),
                onTap: () {
                  // TODO: Aprire il dettaglio del ticket!
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}