package com.pollex.pam.service;

import java.time.Instant;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

import com.pollex.pam.config.ApplicationProperties;
import com.pollex.pam.service.dto.AppointmentUpdateDTO;
import com.pollex.pam.web.rest.errors.SendEmailFailException;
import com.pollex.pam.web.rest.errors.SendSMSFailException;
import io.jsonwebtoken.lang.Assert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.pollex.pam.domain.Appointment;
import com.pollex.pam.domain.AppointmentCustomerView;
import com.pollex.pam.enums.ContactStatusEnum;
import com.pollex.pam.repository.AppointmentCustomerViewRepository;
import com.pollex.pam.repository.AppointmentRepository;
import com.pollex.pam.security.SecurityUtils;
import com.pollex.pam.service.dto.AppointmentCreateDTO;
import com.pollex.pam.service.dto.AppointmentCustomerViewDTO;
import com.pollex.pam.service.mapper.AppointmentCustomerViewMapper;
import com.pollex.pam.service.mapper.AppointmentDTOMapper;
import com.pollex.pam.web.rest.errors.AppointmentNotFoundException;
import org.springframework.util.StringUtils;
import org.thymeleaf.context.Context;
import org.thymeleaf.spring5.SpringTemplateEngine;

import static com.pollex.pam.enums.AppointmentStatusEnum.AVAILABLE;
import static com.pollex.pam.enums.AppointmentStatusEnum.DELETED;

@Service
@Transactional
public class AppointmentService {

    private static final Logger log = LoggerFactory.getLogger(AppointmentService.class);

    private static final String NOTIFY_EMAIL_SUBJECT = "保誠媒合平台系統通知：新預約單";

    @Autowired
	AppointmentRepository appointmentRepository;

	@Autowired
	AppointmentDTOMapper appointmentDTOMapper;

	@Autowired
	ConsultantService consultantService;

	@Autowired
	AppointmentCustomerViewMapper appointmentCustomerViewMapper;

	@Autowired
	AppointmentCustomerViewRepository appointmentCustomerViewRepository;

	@Autowired
	SatisfactionService satisfactionService;

    @Autowired
    SendMsgService sendMsgService;

    @Autowired
    ApplicationProperties applicationProperties;

    @Autowired
    SpringTemplateEngine springTemplateEngine;

	public Appointment customerCreateAppointment(AppointmentCreateDTO appointmentCreateDTO) {
		Appointment appointment = appointmentDTOMapper.toAppointment(appointmentCreateDTO);
        appointment.setStatus(AVAILABLE);
		appointment.setCustomerId(SecurityUtils.getCustomerDBId());
		appointment.setCommunicateStatus(ContactStatusEnum.RESERVED);
		return appointmentRepository.save(appointment);
	}

    public void updateAppointment(AppointmentUpdateDTO updateAppointmentDTO) {
        Appointment appointment = appointmentRepository.findById(updateAppointmentDTO.getId()).get();

        appointment.setPhone(updateAppointmentDTO.getPhone());
        appointment.setEmail(updateAppointmentDTO.getEmail());
        appointment.setContactType(updateAppointmentDTO.getContactType());
        appointment.setGender(updateAppointmentDTO.getGender());
        appointment.setAge(updateAppointmentDTO.getAge());
        appointment.setJob(updateAppointmentDTO.getJob());
        appointment.setRequirement(updateAppointmentDTO.getRequirement());
        appointment.setHopeContactTime(updateAppointmentDTO.getHopeContactTime());
        appointment.setOtherRequirement(updateAppointmentDTO.getOtherRequirement());
        appointment.setLastModifiedDate(Instant.now());

        appointmentRepository.save(appointment);
    }

    public void markAppointmentDeleted(Long appointmentId) {
        Appointment appointment = appointmentRepository.findById(appointmentId).get();
        appointment.setStatus(DELETED);
        appointment.setLastModifiedDate(Instant.now());
        appointmentRepository.save(appointment);
    }

	public List<Appointment> findByAgentNo(String agentNo) {
		return appointmentRepository.findByAgentNo(agentNo);
	}

	public Appointment markAsContacted(Long appointmentId) {
		Appointment appointment = appointmentRepository.findById(appointmentId).get();
		appointment.setCommunicateStatus(ContactStatusEnum.CONTACTED);
        appointment.setContactTime(Instant.now());
        appointment.setLastModifiedDate(Instant.now());
        return appointmentRepository.save(appointment);
	}

	public AppointmentCustomerViewDTO getAppointmentDetail(Long appointmentId) {
		AppointmentCustomerView appointment = appointmentCustomerViewRepository.findById(appointmentId)
				.orElseThrow(AppointmentNotFoundException::new);

        AppointmentCustomerViewDTO dto = appointmentCustomerViewMapper.toAppointmentCustomerViewDTO(appointment);
        setSatisfactionScore(dto, appointmentId);
		return dto;
	}

    public List<AppointmentCustomerViewDTO> getConsultantAvailableAppointments(String agentNo) {
        return appointmentCustomerViewRepository.findByAgentNo(agentNo).stream()
            .filter(appointment -> appointment.getStatus() == AVAILABLE)
            .map(appointmentCustomerView -> {
                AppointmentCustomerViewDTO dto = appointmentCustomerViewMapper.toAppointmentCustomerViewDTO(appointmentCustomerView);
                setSatisfactionScore(dto, appointmentCustomerView.getId());
                return dto;
            })
            .collect(Collectors.toList());
    }

    public void setSatisfactionScore(AppointmentCustomerViewDTO dto, Long appointmentId) {
        satisfactionService.getByAppointmentId(appointmentId).ifPresent(satisfaction -> {
            dto.setSatisfactionScore(satisfaction.getScore());
        });
    }

    public List<AppointmentCustomerView> findAvailableByAgentNoAndCustomerId(String agentNo, Long customerId) {
        return appointmentCustomerViewRepository.findByAgentNoAndCustomerId(agentNo, customerId)
            .stream()
            .filter(appointmentCustomerView -> appointmentCustomerView.getStatus() == AVAILABLE)
            .collect(Collectors.toList());
    }

    public Optional<Appointment> findLatestAppointmentByAgentNoAndCustomerId(String agentNo, Long customerId) {
        return appointmentRepository.findTopByAgentNoAndCustomerIdOrderByAppointmentDateDesc(agentNo, customerId);
    }

    public void recordConsultantReadTime(Long appointmentId) {
        Appointment appointment = appointmentRepository.findById(appointmentId).get();

        if(appointment.getConsultantReadTime() == null) {
            appointment.setConsultantReadTime(Instant.now());
            appointmentRepository.save(appointment);
        }
        else {
            log.debug("this appointment was read, read time = {}", appointment.getConsultantReadTime());
        }
    }

    public void recordAllAppointmentsView(String agentNo) {
        List<Appointment> consultantNotViewAppointments = findByAgentNo(agentNo)
            .stream()
            .filter(appointment -> Objects.isNull(appointment.getConsultantViewTime()))
            .collect(Collectors.toList());

        consultantNotViewAppointments.forEach(appointment -> appointment.setConsultantViewTime(Instant.now()));
        appointmentRepository.saveAll(consultantNotViewAppointments);
    }

    public void sendAppointmentNotify(Appointment appointment) {
        Assert.notNull(appointment, "appointment entity cannot be null");

        log.debug("is need send appointment notify msg? = {}", applicationProperties.isSendNotifyMsg());
        if(applicationProperties.isSendNotifyMsg()) {
            log.debug("sending appointment notify, appointmentId = {}", appointment.getId());
            sendAppointmentNotifyBySMS(appointment);
            sendAppointmentNotifyByHtmlEmail(appointment);
        }
    }

    private void sendAppointmentNotifyBySMS(Appointment appointment) {
        String msg = getAppointmentNotifyWording(appointment);
        String consultantMobile = consultantService.findByAgentNo(appointment.getAgentNo()).getPhoneNumber();

        try {
            if(!StringUtils.hasText(consultantMobile)) {
                throw new SendSMSFailException("the consultant does not have mobile!");
            }

            sendMsgService.sendMsgBySMS(consultantMobile, msg);
        } catch (SendSMSFailException e) {
            log.warn("send appointment notify by sms was fail, appointment Id = {}", appointment.getId(), e);
        }
    }

    private String getAppointmentNotifyWording(Appointment appointment) {
        String normalContent;
        if(StringUtils.hasText(appointment.getPhone())) {
            normalContent = "親愛的顧問您好，您有一筆來自保誠人壽媒合平台的預約，預約客戶手機號碼為" + appointment.getPhone();
        }
        else {
            normalContent = "親愛的顧問您好，您有一筆來自保誠人壽媒合平台的預約";
        }

        String urlContent = "，請點擊網址：" + getAppointmentDetailUrl(appointment.getId()) + "查看，並安排聯絡訪談，謝謝！";
        return normalContent + urlContent;
    }

    private void sendAppointmentNotifyByHtmlEmail(Appointment appointment) {
        String senderEmail = applicationProperties.getEmail().getSenderEmail();
        String consultantEmail = consultantService.findByAgentNo(appointment.getAgentNo()).getEmail();
        String customerMobile = appointment.getPhone();
        String normalContent;

        if(StringUtils.hasText(customerMobile)) {
            normalContent = "親愛的顧問您好：您有一筆來自保誠人壽媒合平台的預約，預約客戶手機號碼為" + customerMobile + "，";
        }
        else {
            normalContent = "親愛的顧問您好：您有一筆來自保誠人壽媒合平台的預約，";
        }

        Context context = new Context();
        context.setVariable("content", normalContent);
        context.setVariable("urlHint", getAppointmentDetailUrl(appointment.getId()));
        String content = springTemplateEngine.process("mail/appointmentNotifyEmail", context);

        try {
            if(!StringUtils.hasText(consultantEmail)) {
                throw new SendEmailFailException("the consultant does not have email!");
            }

            sendMsgService.sendMsgByEmail(senderEmail, consultantEmail, NOTIFY_EMAIL_SUBJECT, content, true);
        } catch (SendEmailFailException e) {
            log.warn("send appointment notify by email was fail, appointment Id = {}", appointment.getId(), e);
        }
    }

    public String getAppointmentDetailUrl(Long appointmentId) {
        return applicationProperties.getFrontEndDomain() + "/myAppointmentList/contactedList?appointmentId=" + appointmentId;
    }
}