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

/// حالة شاشة البحث عن الوجهة.
class DestinationState extends Equatable {
  final String query;
  final List<PlaceModel> results;
  final bool searching;
  final String? error;

  const DestinationState({
    this.query = '',
    this.results = const [],
    this.searching = false,
    this.error,
  });

  DestinationState copyWith({
    String? query,
    List<PlaceModel>? results,
    bool? searching,
    String? error,
    bool clearError = false,
  }) {
    return DestinationState(
      query: query ?? this.query,
      results: results ?? this.results,
      searching: searching ?? this.searching,
      error: clearError ? null : (error ?? this.error),
    );
  }

  @override
  List<Object?> get props => [query, results, searching, error];
}

/// البحث عن وجهة مع debounce.
class DestinationCubit extends Cubit<DestinationState> {
  final MapsRepository _mapsRepo;
  Timer? _debounce;

  DestinationCubit(this._mapsRepo) : super(const DestinationState());

  void onQueryChanged(String query) {
    _debounce?.cancel();
    emit(state.copyWith(query: query, clearError: true));

    if (query.trim().length < 2) {
      emit(state.copyWith(results: [], searching: false));
      return;
    }

    emit(state.copyWith(searching: true));

    _debounce = Timer(const Duration(milliseconds: 500), () {
      _search(query);
    });
  }

  Future<void> _search(String query) async {
    try {
      final results = await _mapsRepo.autocomplete(query);
      emit(state.copyWith(results: results, searching: false));
    } catch (e) {
      emit(state.copyWith(searching: false, error: e.toString()));
    }
  }

  Future<void> searchDirectly(String query) async {
    _debounce?.cancel();
    if (query.trim().length < 2) return;
    emit(state.copyWith(searching: true, clearError: true));
    try {
      final results = await _mapsRepo.autocomplete(query);
      emit(state.copyWith(results: results, searching: false));
    } catch (e) {
      emit(state.copyWith(searching: false, error: e.toString()));
    }
  }

  @override
  Future<void> close() {
    _debounce?.cancel();
    return super.close();
  }
}