import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flux/features/operations/blocs/operations_cubit.dart';
import 'package:flux/features/operations/models/operation_model.dart';
import 'package:go_router/go_router.dart';
// Importa i tuoi modelli e cubit

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

  @override
  State<OperationsScreen> createState() => _OperationsScreenState();
}

class _OperationsScreenState extends State<OperationsScreen> {
  final ScrollController _scrollController = ScrollController();

  @override
  void initState() {
    super.initState();
    // Agganciamo il listener per la paginazione (Scroll Infinito)
    _scrollController.addListener(_onScroll);
    // Carichiamo i servizi iniziali
    context.read<OperationsCubit>().loadOperations();
  }

  void _onScroll() {
    if (_isBottom) {
      context.read<OperationsCubit>().loadOperations();
    }
  }

  bool get _isBottom {
    if (!_scrollController.hasClients) return false;
    final maxScroll = _scrollController.position.maxScrollExtent;
    final currentScroll = _scrollController.offset;
    // Carica quando mancano 200px alla fine
    return currentScroll >= (maxScroll * 0.9);
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Gestione Servizi"),
        elevation: 0,
        actions: [
          IconButton(
            icon: const Icon(Icons.search),
            onPressed: () {
              // Qui potrai implementare una barra di ricerca
            },
          ),
        ],
      ),
      body: BlocBuilder<OperationsCubit, OperationsState>(
        builder: (context, state) {
          // 1. Stato di caricamento iniziale
          if (state.status == OperationsStatus.loading &&
              state.allOperations.isEmpty) {
            return const Center(child: CircularProgressIndicator());
          }

          // 2. Lista vuota
          if (state.allOperations.isEmpty) {
            return Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Text("Nessuna pratica trovata."),
                  const SizedBox(height: 10),
                  ElevatedButton(
                    onPressed: () => context
                        .read<OperationsCubit>()
                        .loadOperations(refresh: true),
                    child: const Text("Riprova"),
                  ),
                ],
              ),
            );
          }

          // 3. La Lista (con Pull-to-refresh)
          return RefreshIndicator(
            onRefresh: () =>
                context.read<OperationsCubit>().loadOperations(refresh: true),
            child: ListView.builder(
              controller: _scrollController,
              padding: const EdgeInsets.only(bottom: 80), // Spazio per il FAB
              itemCount: state.hasReachedMax
                  ? state.allOperations.length
                  : state.allOperations.length + 1,
              itemBuilder: (context, index) {
                if (index >= state.allOperations.length) {
                  return const Center(
                    child: Padding(
                      padding: EdgeInsets.all(16.0),
                      child: CircularProgressIndicator(strokeWidth: 2),
                    ),
                  );
                }

                final operation = state.allOperations[index];
                return _buildOperationCard(context, operation);
              },
            ),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => startNewOperation(context),
        child: const Icon(Icons.add),
      ),
    );
  }

  Widget _buildOperationCard(BuildContext context, OperationModel operation) {
    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
      elevation: 2,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
      child: ListTile(
        contentPadding: const EdgeInsets.all(12),
        title: Row(
          children: [
            Expanded(
              child: Text(
                operation.customerDisplayName ?? "Cliente sconosciuto",
                style: const TextStyle(
                  fontWeight: FontWeight.bold,
                  fontSize: 16,
                ),
              ),
            ),
          ],
        ),
        subtitle: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const SizedBox(height: 4),
            Text(
              "Pratica: ${operation.reference} • ${operation.createdAt?.day}/${operation.createdAt?.month}/${operation.createdAt?.year}",
            ),
            const SizedBox(height: 8),
            Row(
              children: [
                Text(operation.type),
                const SizedBox(width: 8),
                _buildOperationStatus(operation.status),
              ],
            ),
          ],
        ),
        trailing: const Icon(Icons.chevron_right),
        onTap: () => context.pushNamed(
          'operation-form',
          extra: operation, // <-- LA MAGIA È QUI: Passa l'oggetto intero!
          // Teniamo anche il parametro URL per coerenza di routing
          queryParameters: operation.id != null
              ? {'operationId': operation.id!}
              : {},
        ),
      ),
    );
  }

  Widget _buildOperationStatus(OperationStatus status) {
    Color color;
    switch (status) {
      case OperationStatus.canceled || OperationStatus.ko:
        color = Colors.grey.shade800;
        break;
      case OperationStatus.waitingforaction || OperationStatus.draft:
        color = Colors.orange;
        break;
      case OperationStatus.ok:
        color = Colors.green;
        break;
      case OperationStatus.waitingfordeployment ||
          OperationStatus.waitingforsupport:
        color = Colors.blue;
        break;
    }
    return Chip(
      label: Text("BOZZA", style: TextStyle(fontSize: 10, color: Colors.white)),
      backgroundColor: color,
      visualDensity: VisualDensity.compact,
    );
  }

  void startNewOperation(BuildContext context) {
    context.pushNamed('operation-form');
  }
}