import 'dart:developer';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:professional_repository/professional_repository.dart';

import 'package:service_repository/service_repository.dart';
import 'package:user_repository/user_repository.dart';

part 'service_event.dart';
part 'service_state.dart';

class ServiceBloc extends Bloc<ServiceEvent, ServiceState> {
  final FirebaseServiceRepository _serviceRepository;
  final UserRepository _userRepository;
  final FirebaseProfessionalRepository _professionalRepository;

  ServiceBloc({
    required FirebaseServiceRepository serviceRepository,
    required UserRepository userRepository,
    required FirebaseProfessionalRepository professionRepository,
  })  : _serviceRepository = serviceRepository,
        _userRepository = userRepository,
        _professionalRepository = professionRepository,
        super(CreateServiceInitial()) {
    on<CreateService>(_onCreateService);
    on<LoadService>(_onLoadService);
    on<UpdateServiceStatus>(_onUpdateServiceStatus);
    on<LoadServicesForUser>(_onLoadServicesForUser);
    on<LoadServicesForProfessional>(_onLoadServicesForProfessional);
    on<LoadServicesHistoryForUser>(_onLoadServicesHistoryForUser);
    on<LoadServicesHistoryForProfessional>(
        _onLoadServicesHistoryForProfessional);
  }

  void _onCreateService(CreateService event, Emitter<ServiceState> emit) async {
    try {
      emit(CreateServiceLoading());

      ServiceEntity service = ServiceEntity(
        professionalId: event.professionalId,
        professionalScored: false,
        userId: event.userId,
        userScored: false,
        address: event.address,
        aditionalAddress: event.aditionalAddress,
        latitude: event.latitude,
        longitude: event.longitude,
        day: event.day,
        createdAt: event.createdAt,
        description: event.description,
        range1Hour1: event.range1Hour1,
        range1Hour2: event.range1Hour2,
        rate: event.rate,
        status: ServiceStatus.pending,
        location: event.location,
      );

      String serviceId = await _serviceRepository.createService(service);

      emit(CreateServiceSuccess(serviceId));
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }

  void _onLoadService(LoadService event, Emitter<ServiceState> emit) async {
    try {
      final serviceStream = _serviceRepository.getService(event.serviceId);

      await for (var service in serviceStream) {
        emit(ServiceLoaded(service));
      }
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }

  void _onLoadServicesHistoryForUser(
      LoadServicesHistoryForUser event, Emitter<ServiceState> emit) async {
    try {
      final servicesStream =
          _serviceRepository.getServicesHistoryForUser(event.userId);

      await for (var services in servicesStream) {
        if (services.isEmpty) {
          emit(const ServicesForUserLoaded([]));
          return;
        }
        final professionalIds = services.map((e) => e.professionalId);
        final List<MyUser> users =
            await _userRepository.getUsersFromIds(professionalIds);

        final usersDir = {for (var e in users) e.id: e};

        final List<ProfessionalEntity> professionsList =
            await _professionalRepository
                .getProfessionalsFromIds(professionalIds);

        final professionsDir = {for (var e in professionsList) e.id: e};

        final servicesInfo = services.map((e) {
          return ServiceInfoUI(
              service: e,
              user: usersDir[e.professionalId]!,
              professional: professionsDir[e.professionalId]!);
        }).toList();

        emit(ServicesForUserLoaded(servicesInfo));
      }
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }

  void _onLoadServicesHistoryForProfessional(
      LoadServicesHistoryForProfessional event,
      Emitter<ServiceState> emit) async {
    try {
      final servicesStream =
          _serviceRepository.getServicesHistoryForProfessional(event.userId);

      await for (var services in servicesStream) {
        if (services.isEmpty) {
          emit(const ServicesForUserLoaded([]));
          return;
        }
        final userIds = services.map((e) => e.userId);
        final List<MyUser> users =
            await _userRepository.getUsersFromIds(userIds);

        final usersDir = {for (var e in users) e.id: e};

        final servicesInfo = services.map((e) {
          return ServiceInfoUI(
            service: e,
            user: usersDir[e.userId]!,
          );
        }).toList();

        emit(ServicesForUserLoaded(servicesInfo));
      }
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }

  void _onLoadServicesForUser(
      LoadServicesForUser event, Emitter<ServiceState> emit) async {
    try {
      final servicesStream =
          _serviceRepository.getServicesForUser(event.userId);

      await for (var services in servicesStream) {
        if (services.isEmpty) {
          emit(const ServicesForUserLoaded([]));
          return;
        }
        final professionalIds = services.map((e) => e.professionalId);

        final List<MyUser> users =
            await _userRepository.getUsersFromIds(professionalIds);

        final usersDir = {for (var e in users) e.id: e};

        final List<ProfessionalEntity> professionsList =
            await _professionalRepository
                .getProfessionalsFromIds(professionalIds);

        final professionsDir = {for (var e in professionsList) e.id: e};

        final servicesInfo = services.map((e) {
          return ServiceInfoUI(
              service: e,
              user: usersDir[e.professionalId]!,
              professional: professionsDir[e.professionalId]!);
        }).toList();

        emit(ServicesForUserLoaded(servicesInfo));
      }
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }

  void _onLoadServicesForProfessional(
      LoadServicesForProfessional event, Emitter<ServiceState> emit) async {
    try {
      final servicesStream =
          _serviceRepository.getServicesForProfessional(event.userId);

      await for (var services in servicesStream) {
        if (services.isEmpty) {
          emit(const ServicesForUserLoaded([]));
          return;
        }
        final userIds = services.map((e) => e.userId);

        final List<MyUser> users =
            await _userRepository.getUsersFromIds(userIds);

        final usersDir = {for (var e in users) e.id: e};

        final servicesInfo = services.map((e) {
          return ServiceInfoUI(
            service: e,
            user: usersDir[e.userId]!,
          );
        }).toList();

        emit(ServicesForUserLoaded(servicesInfo));
      }
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }

  void _onUpdateServiceStatus(
      UpdateServiceStatus event, Emitter<ServiceState> emit) async {
    try {
      emit(CreateServiceLoading());
      await _serviceRepository.updateServiceStatus(
          event.serviceId, event.newStatus);
      emit(ServiceStatusUpdated(event.newStatus));
    } catch (e) {
      log(e.toString());
      emit(CreateServiceFailure());
    }
  }
}

class ServiceInfoUI {
  final ServiceEntity service;
  final MyUser user;
  final ProfessionalEntity? professional;

  ServiceInfoUI({
    required this.service,
    required this.user,
    this.professional,
  });
}