import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../app/providers.dart';
import '../../../domain/entities/customer.dart';

/// Outcome of the mobile-number lookup on the Existing Customer screen.
sealed class CustomerLookupState {
  const CustomerLookupState();
}

class LookupIdle extends CustomerLookupState {
  const LookupIdle();
}

class LookupSearching extends CustomerLookupState {
  const LookupSearching();
}

class LookupFound extends CustomerLookupState {
  const LookupFound(this.customer);

  final Customer customer;
}

class LookupNotFound extends CustomerLookupState {
  const LookupNotFound(this.mobile);

  final String mobile;
}

class LookupError extends CustomerLookupState {
  const LookupError(this.message);

  final String message;
}

class CustomerLookupController extends StateNotifier<CustomerLookupState> {
  CustomerLookupController(this._ref) : super(const LookupIdle());

  final Ref _ref;

  Future<void> search(String mobile) async {
    final digits = mobile.replaceAll(RegExp(r'\D'), '');
    if (digits.length != 10) {
      state = const LookupIdle();
      return;
    }

    state = const LookupSearching();
    try {
      final customer =
          await _ref.read(customerRepositoryProvider).findByMobile(digits);
      state = customer != null
          ? LookupFound(customer)
          : LookupNotFound(digits);
    } catch (e) {
      state = LookupError(e.toString());
    }
  }

  void reset() => state = const LookupIdle();
}

final customerLookupProvider =
    StateNotifierProvider<CustomerLookupController, CustomerLookupState>(
  (ref) => CustomerLookupController(ref),
);

final recentCustomersProvider = FutureProvider<List<Customer>>(
  (ref) => ref.watch(customerRepositoryProvider).recent(limit: 6),
);