import 'dart:async';
import 'package:equatable/equatable.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:geolocator/geolocator.dart';
import 'package:intaleq_maps/intaleq_maps.dart';
import '../data/maps_repository.dart';
import '../data/models/place_model.dart';

/// حالة شاشة الخريطة الرئيسية.
class HomeState extends Equatable {
  final bool loading;
  final LatLng? currentLocation;
  final LatLng? cameraTarget;
  final PlaceModel? pickup;
  final PlaceModel? destination;
  final String? error;

  const HomeState({
    this.loading = true,
    this.currentLocation,
    this.cameraTarget,
    this.pickup,
    this.destination,
    this.error,
  });

  HomeState copyWith({
    bool? loading,
    LatLng? currentLocation,
    LatLng? cameraTarget,
    PlaceModel? pickup,
    PlaceModel? destination,
    String? error,
    bool clearPickup = false,
    bool clearDestination = false,
    bool clearError = false,
  }) {
    return HomeState(
      loading: loading ?? this.loading,
      currentLocation: currentLocation ?? this.currentLocation,
      cameraTarget: cameraTarget ?? this.cameraTarget,
      pickup: clearPickup ? null : (pickup ?? this.pickup),
      destination: clearDestination ? null : (destination ?? this.destination),
      error: clearError ? null : (error ?? this.error),
    );
  }

  @override
  List<Object?> get props => [loading, currentLocation, cameraTarget, pickup, destination, error];
}

/// إدارة موقع المستخدم الحالي + الخريطة.
class HomeCubit extends Cubit<HomeState> {
  final MapsRepository _mapsRepo;

  HomeCubit(this._mapsRepo) : super(const HomeState()) {
    initLocation();
  }

  Future<void> initLocation() async {
    try {
      emit(state.copyWith(loading: true, clearError: true));

      LocationPermission permission = await Geolocator.checkPermission();
      if (permission == LocationPermission.denied) {
        permission = await Geolocator.requestPermission();
        if (permission == LocationPermission.denied ||
            permission == LocationPermission.deniedForever) {
          emit(state.copyWith(
            loading: false,
            error: 'Location permission denied',
          ));
          return;
        }
      }

      final pos = await Geolocator.getCurrentPosition(
        locationSettings: const LocationSettings(
          accuracy: LocationAccuracy.high,
          timeLimit: Duration(seconds: 10),
        ),
      );
      final loc = LatLng(pos.latitude, pos.longitude);

      // جلب العنوان العكسي للموقع الحالي.
      final place = await _mapsRepo.reverseGeocode(pos.latitude, pos.longitude);

      emit(state.copyWith(
        loading: false,
        currentLocation: loc,
        cameraTarget: loc,
        pickup: place,
      ));
    } catch (e) {
      emit(state.copyWith(
        loading: false,
        error: e.toString(),
      ));
    }
  }

  void updateCameraTarget(LatLng target) {
    emit(state.copyWith(cameraTarget: target));
  }

  void setPickup(PlaceModel place) {
    emit(state.copyWith(pickup: place));
  }

  void setPickupFromLatLng(LatLng loc, {String? address}) {
    emit(state.copyWith(
      pickup: PlaceModel(
        name: address ?? '',
        address: address,
        lat: loc.latitude,
        lng: loc.longitude,
      ),
    ));
  }

  void setDestination(PlaceModel place) {
    emit(state.copyWith(destination: place));
  }

  void clearTripData() {
    emit(state.copyWith(clearPickup: true, clearDestination: true, clearError: true));
  }
}