package edu.gjoko.schedlr.services;

import edu.gjoko.schedlr.dto.AppointmentInfoDto;
import edu.gjoko.schedlr.entity.*;
import edu.gjoko.schedlr.exceptions.BlockingTimeException;
import edu.gjoko.schedlr.mappers.AppointmentInfoDtoBusinessMapper;
import edu.gjoko.schedlr.mappers.AppointmentInfoDtoCustomerMapper;
import edu.gjoko.schedlr.repositories.AppointmentRepository;
import edu.gjoko.schedlr.repositories.ServiceRepository;
import edu.gjoko.schedlr.repositories.StakeholderRepository;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Service;

import javax.persistence.EntityNotFoundException;
import javax.security.sasl.AuthenticationException;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@Service
@AllArgsConstructor
public class AppointmentsService {

    private final AppointmentRepository appointmentRepository;
    private final StakeholderRepository stakeholderRepository;
    private final ServiceRepository serviceRepository;
    private final AppointmentInfoDtoBusinessMapper appointmentInfoDtoBusinessMapper;
    private final AppointmentInfoDtoCustomerMapper appointmentInfoDtoCustomerMapper;


    public void saveAppointment(Appointment appointment) {
        var service = serviceRepository.findById(appointment.getService().getId()).get();

        // remove 1 minute in order to prevent overlapping
        appointment.setEndTime(appointment.getStartTime().plusMinutes(service.getDuration() - 1));
        List<Appointment> blockingAppointments = appointmentRepository.
                findBlockingAppointments(
                        appointment.getService().getBusiness().getId(), appointment.getStartTime(), appointment.getEndTime());

        // check to see if there are blocking exceptions
        if (blockingAppointments != null && !blockingAppointments.isEmpty()) {
            throw new BlockingTimeException();
        }
        appointmentRepository.save(appointment);
    }

    public List<AppointmentInfoDto> getFutureAppointmentInfoList(Long stakeholderId) {
        StakeholderType type = stakeholderRepository.findById(stakeholderId).get().getStakeholderType();
        List<AppointmentInfoDto> appointmentInfoDtoList = new ArrayList<>();

        switch (type) {
            case BUSINESS_OWNER -> appointmentInfoDtoList = appointmentRepository.findFutureAppointmentsByBusinessOwnerId(stakeholderId, LocalDateTime.now())
                    .stream()
                    .map(appointmentInfoDtoBusinessMapper::appointmentToAppointmentInfoDto)
                    .toList();
            case CUSTOMER -> appointmentInfoDtoList = appointmentRepository.findFutureAppointmentsByCustomerId(stakeholderId, LocalDateTime.now())
                    .stream()
                    .map(appointmentInfoDtoCustomerMapper::appointmentToAppointmentInfoDto)
                    .toList();
        }

        return appointmentInfoDtoList;
    }

    public List<AppointmentInfoDto> getPastAppointmentInfoList(Long stakeholderId) {
        StakeholderType type = stakeholderRepository.findById(stakeholderId).get().getStakeholderType();
        List<Appointment> appointmentInfoDtoList = new ArrayList<>();

        switch (type) {
            case BUSINESS_OWNER -> appointmentInfoDtoList = appointmentRepository.findPastAppointmentsByBusinessOwnerId(stakeholderId, LocalDateTime.now());
            case CUSTOMER -> appointmentInfoDtoList = appointmentRepository.findPastAppointmentsByCustomerId(stakeholderId, LocalDateTime.now());
        }

        return appointmentInfoDtoList
                .stream()
                .map(appointmentInfoDtoBusinessMapper::appointmentToAppointmentInfoDto)
                .toList();

    }

    public List<Appointment> getActiveAppointmentsByBusiness(Long businessId) {
        return appointmentRepository.getActiveAppointmentsByBusiness(businessId);
    }

    public void deleteAppointment(Long appointmentId, Long stakeholderId) throws AuthenticationException {
        Optional<Stakeholder> stakeholderOptional = stakeholderRepository.findById(stakeholderId);
        if (stakeholderOptional.isPresent()) {
            Optional<Appointment> optional = appointmentRepository.findAppointmentByIdAndCustomer_Id(appointmentId, stakeholderId);
            if (optional.isEmpty()) {
                optional = appointmentRepository.findAppointmentByIdAndService_Business_Owner_Id(appointmentId, stakeholderId);
                if (optional.isEmpty()) {
                    throw new EntityNotFoundException("No appointment was found for the give stakeholder and appointment id.");
                } else {
                    softDeleteAppointment(optional.get(), AppointmentStatus.CANCELLED_BY_BUSINESS_OWNER);
                }
            } else {
                softDeleteAppointment(optional.get(), AppointmentStatus.CANCELLED_BY_CUSTOMER);
            }
        } else {
            throw new AuthenticationException();
        }
    }

    public void softDeleteAppointment(Appointment appointment, AppointmentStatus appointmentStatus) {
        appointment.setAppointmentStatus(appointmentStatus);
        appointmentRepository.save(appointment);
    }
}