import 'package:equatable/equatable.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../data/tariff_repository.dart';
import '../data/models/quote_model.dart';

/// حالة شاشة اختيار فئة الرحلة + السعر.
class QuoteState extends Equatable {
  final bool loading;
  final QuoteModel? quote;
  final String? selectedClass;
  final String paymentMethod;
  final String? couponCode;
  final String? error;

  const QuoteState({
    this.loading = false,
    this.quote,
    this.selectedClass,
    this.paymentMethod = 'cash',
    this.couponCode,
    this.error,
  });

  QuoteState copyWith({
    bool? loading,
    QuoteModel? quote,
    String? selectedClass,
    String? paymentMethod,
    String? couponCode,
    String? error,
    bool clearError = false,
    bool clearCoupon = false,
  }) {
    return QuoteState(
      loading: loading ?? this.loading,
      quote: quote ?? this.quote,
      selectedClass: selectedClass ?? this.selectedClass,
      paymentMethod: paymentMethod ?? this.paymentMethod,
      couponCode: clearCoupon ? null : (couponCode ?? this.couponCode),
      error: clearError ? null : (error ?? this.error),
    );
  }

  QuoteClassModel? get selectedQuoteClass {
    if (quote == null || selectedClass == null) return null;
    try {
      return quote!.classes.firstWhere((c) => c.vehicleClass == selectedClass);
    } catch (_) {
      return null;
    }
  }

  @override
  List<Object?> get props => [loading, quote, selectedClass, paymentMethod, couponCode, error];
}

/// جلب الأسعار واختيار الفئة.
class QuoteCubit extends Cubit<QuoteState> {
  final TariffRepository _tariffRepo;

  QuoteCubit(this._tariffRepo) : super(const QuoteState());

  Future<void> fetchQuote({
    required double pickupLat,
    required double pickupLng,
    String? pickupAddress,
    required double dropoffLat,
    required double dropoffLng,
    String? dropoffAddress,
    List<Map<String, dynamic>>? stops,
    String? vehicleClass,
    String? scheduledAt,
  }) async {
    emit(state.copyWith(loading: true, clearError: true));
    try {
      final quote = await _tariffRepo.getQuote(
        pickupLat: pickupLat,
        pickupLng: pickupLng,
        pickupAddress: pickupAddress,
        dropoffLat: dropoffLat,
        dropoffLng: dropoffLng,
        dropoffAddress: dropoffAddress,
        vehicleClass: vehicleClass,
        scheduledAt: scheduledAt,
      );
      final firstClass = quote.classes.isNotEmpty ? quote.classes.first.vehicleClass : null;
      emit(state.copyWith(
        loading: false,
        quote: quote,
        selectedClass: firstClass,
      ));
    } catch (e) {
      emit(state.copyWith(loading: false, error: e.toString()));
    }
  }

  void selectClass(String vehicleClass) {
    emit(state.copyWith(selectedClass: vehicleClass));
  }

  void setPaymentMethod(String method) {
    emit(state.copyWith(paymentMethod: method));
  }

  void setCouponCode(String? code) {
    emit(state.copyWith(couponCode: code));
  }
}