import 'dart:async'; // Serve per il Timer del debounce
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:flux/core/blocs/session/session_cubit.dart';
import 'package:flux/features/customers/data/customer_repository.dart';
import 'package:flux/features/customers/models/customer_model.dart';
import 'package:get_it/get_it.dart';

part 'customer_state.dart';

class CustomerCubit extends Cubit<CustomerState> {
  final CustomerRepository _repository = GetIt.I<CustomerRepository>();
  final SessionCubit _sessionCubit = GetIt.I<SessionCubit>();

  // Variabile per gestire il debounce della ricerca
  Timer? _searchDebounce;

  CustomerCubit() : super(const CustomerState());

  // --- LETTURA ---
  Future<void> loadCustomers() async {
    emit(state.copyWith(status: CustomerStatus.loading));
    try {
      final customers = await _repository.getCustomers(
        _sessionCubit.state.company!.id!,
      );
      emit(
        state.copyWith(status: CustomerStatus.success, customers: customers),
      );
    } catch (e) {
      emit(
        state.copyWith(
          status: CustomerStatus.failure,
          errorMessage: e.toString(),
        ),
      );
    }
  }

  // --- CREAZIONE ---
  Future<void> createCustomer(CustomerModel customer) async {
    emit(state.copyWith(status: CustomerStatus.loading));
    try {
      final newCustomer = await _repository.saveCustomer(customer);

      // Aggiorniamo la lista locale aggiungendo il nuovo cliente in cima
      final updatedList = List<CustomerModel>.from(state.customers)
        ..insert(0, newCustomer);

      emit(
        state.copyWith(
          status: CustomerStatus.success,
          customers: updatedList,
          lastCreatedCustomer: newCustomer,
        ),
      );
    } catch (e) {
      emit(
        state.copyWith(
          status: CustomerStatus.failure,
          errorMessage: e.toString(),
        ),
      );
    }
  }

  // --- AGGIORNAMENTO ---
  Future<void> updateCustomer(CustomerModel customer) async {
    emit(state.copyWith(status: CustomerStatus.loading));
    try {
      final updatedCustomer = await _repository.updateCustomer(customer);

      final updatedList = List<CustomerModel>.from(state.customers);
      final index = updatedList.indexWhere((c) => c.id == updatedCustomer.id);

      if (index != -1) {
        updatedList[index] = updatedCustomer;
      }

      emit(
        state.copyWith(
          status: CustomerStatus.success,
          customers: updatedList,
          lastCreatedCustomer:
              updatedCustomer, // Utile se modifichi un cliente appena creato
        ),
      );
    } catch (e) {
      emit(
        state.copyWith(
          status: CustomerStatus.failure,
          errorMessage: e.toString(),
        ),
      );
    }
  }

  // --- RICERCA CON DEBOUNCE ---
  void searchCustomers(String query) {
    // 1. Se c'è già una ricerca in attesa (l'utente sta digitando veloce), la annulliamo
    if (_searchDebounce?.isActive ?? false) _searchDebounce!.cancel();

    // 2. Facciamo partire un timer di 400 millisecondi
    _searchDebounce = Timer(const Duration(milliseconds: 300), () async {
      // Se cancella tutto e la query è vuota, ricarichiamo la lista base
      if (query.trim().isEmpty) {
        await loadCustomers();
        return;
      }

      // Nessun "loading" state qui, per evitare sfarfallii visivi mentre si scrive
      try {
        final results = await _repository.searchCustomers(
          _sessionCubit.state.company!.id!,
          query,
        );
        emit(
          state.copyWith(status: CustomerStatus.success, customers: results),
        );
      } catch (e) {
        emit(
          state.copyWith(
            status: CustomerStatus.failure,
            errorMessage: e.toString(),
          ),
        );
      }
    });
  }

  Future<CustomerModel?> quickCreateCustomer({
    required String name,
    String? phone,
    String? email,
  }) async {
    final newCustomer = CustomerModel(
      name: name,
      phoneNumber: phone ?? '',
      email: email ?? '',
      companyId: _sessionCubit.state.company!.id!,
      note: '',
    );

    try {
      final saved = await _repository.saveCustomer(newCustomer);
      // Lo aggiungiamo in cima ai suggerimenti
      emit(state.copyWith(customers: [saved, ...state.customers]));
      return saved;
    } catch (e) {
      return null;
    }
  }

  // Pulizia della memoria quando il Cubit viene distrutto
  @override
  Future<void> close() {
    _searchDebounce?.cancel();
    return super.close();
  }
}