import 'package:equatable/equatable.dart';
import '../data/models/trip_model.dart';

/// هل هذه الحالة نهائية (لا انتقالات منها)?
bool isTerminalStatus(String status) {
  return status == 'cancelled' || status == 'no_drivers' || status == 'expired' || status == 'paid';
}

/// حالة TripBloc الموحدة.
class TripState extends Equatable {
  final TripRequestStatus requestStatus;
  final TripModel? trip;
  final String? driverName;
  final String? vehicleMake;
  final String? vehicleModel;
  final String? vehiclePlate;
  final String? vehicleColor;
  final double? driverLat;
  final double? driverLng;
  final double? driverHeading;
  final String? error;
  final bool rated;

  const TripState({
    this.requestStatus = TripRequestStatus.idle,
    this.trip,
    this.driverName,
    this.vehicleMake,
    this.vehicleModel,
    this.vehiclePlate,
    this.vehicleColor,
    this.driverLat,
    this.driverLng,
    this.driverHeading,
    this.error,
    this.rated = false,
  });

  TripState copyWith({
    TripRequestStatus? requestStatus,
    TripModel? trip,
    String? driverName,
    String? vehicleMake,
    String? vehicleModel,
    String? vehiclePlate,
    String? vehicleColor,
    double? driverLat,
    double? driverLng,
    double? driverHeading,
    String? error,
    bool? rated,
    bool clearError = false,
    bool clearDriver = false,
  }) {
    return TripState(
      requestStatus: requestStatus ?? this.requestStatus,
      trip: trip ?? this.trip,
      driverName: clearDriver ? null : (driverName ?? this.driverName),
      vehicleMake: clearDriver ? null : (vehicleMake ?? this.vehicleMake),
      vehicleModel: clearDriver ? null : (vehicleModel ?? this.vehicleModel),
      vehiclePlate: clearDriver ? null : (vehiclePlate ?? this.vehiclePlate),
      vehicleColor: clearDriver ? null : (vehicleColor ?? this.vehicleColor),
      driverLat: driverLat ?? this.driverLat,
      driverLng: driverLng ?? this.driverLng,
      driverHeading: driverHeading ?? this.driverHeading,
      error: clearError ? null : (error ?? this.error),
      rated: rated ?? this.rated,
    );
  }

  /// هل هناك رحلة نشطة (ليست idle ولا terminal)?
  bool get hasActiveTrip =>
      trip != null &&
      requestStatus != TripRequestStatus.idle &&
      !isTerminalStatus(trip!.status);

  /// هل يمكن إلغاء الرحلة حالياً?
  bool get canCancel {
    if (trip == null) return false;
    return ['searching', 'assigned', 'driver_arriving', 'driver_arrived']
        .contains(trip!.status);
  }

  /// هل يمكن للمستخدم ركوب الرحلة (اكتملت)?
  bool get isCompleted => trip?.status == 'completed' || trip?.status == 'paid';

  @override
  List<Object?> get props => [
        requestStatus,
        trip,
        driverName,
        vehicleMake,
        vehicleModel,
        vehiclePlate,
        vehicleColor,
        driverLat,
        driverLng,
        driverHeading,
        error,
        rated,
      ];
}

enum TripRequestStatus {
  idle,
  loading,
  searching,
  active, // assigned → in_progress
  completed,
  error,
}