package net.gepafin.tendermanagement.dao;


import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.log4j.Log4j2;
import net.gepafin.tendermanagement.config.Translator;
import net.gepafin.tendermanagement.constants.GepafinConstant;
import net.gepafin.tendermanagement.entities.*;
import net.gepafin.tendermanagement.enums.EmailScenarioTypeEnum;
import net.gepafin.tendermanagement.enums.EmailServiceTypeEnum;
import net.gepafin.tendermanagement.enums.RecipientTypeEnum;
import net.gepafin.tendermanagement.enums.StatusTypeEnum;
import net.gepafin.tendermanagement.model.request.EmailLogRequest;
import net.gepafin.tendermanagement.model.response.EmailResendResponseBean;
import net.gepafin.tendermanagement.model.response.EmailSendResponse;
import net.gepafin.tendermanagement.repositories.*;
import net.gepafin.tendermanagement.service.CallService;
import net.gepafin.tendermanagement.util.Utils;
import net.gepafin.tendermanagement.web.rest.api.errors.CustomValidationException;
import net.gepafin.tendermanagement.web.rest.api.errors.ResourceNotFoundException;
import net.gepafin.tendermanagement.web.rest.api.errors.Status;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.util.*;

@Component
@Log4j2
public class EmailDao {

    @Autowired
    EmailLogRepository emailLogRepository;

    @Autowired
    EmailNotificationDao emailNotificationDao;
    
    @Autowired
    private CallService callService;

    @Autowired
    private EmailLogDao emailLogDao;

    @Autowired
    private UserActionsRepository userActionsRepository;

    @Autowired
    private ApplicationAmendmentRequestRepository applicationAmendmentRequestRepository;

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private ApplicationEvaluationRepository applicationEvaluationRepository;

    public EmailResendResponseBean resendEmail(HttpServletRequest request , Long userActionId){
        UserActionEntity userActionEntity = userActionsRepository.findUserActionByIdAndIsDeletedFalse(userActionId);
        if(userActionEntity == null){
            throw new ResourceNotFoundException(Status.NOT_FOUND, Translator.toLocale(GepafinConstant.USER_ACTION_ID_NOT_FOUND));
        }
        List<EmailLogEntity> emailLogs  = emailLogRepository.findByUserActionIdAndEmailServiceTypeAndSendStatus(userActionId,EmailServiceTypeEnum.PEC_SERVICE.getValue(),StatusTypeEnum.FAILED.getValue());

        if (emailLogs.isEmpty()) {
           log.info("No emails found for given userActionId: {}",userActionId);
           throw new CustomValidationException(Status.VALIDATION_ERROR,Translator.toLocale(GepafinConstant.NO_EMAIL_LOG_FOUND));
        }
        EmailResendResponseBean emailResendResponseBean = new EmailResendResponseBean();
        for (EmailLogEntity log : emailLogs){
            EmailLogRequest emailLogRequest = emailLogDao.createEmailLogRequest(EmailScenarioTypeEnum.valueOf(log.getEmailType()),
                    RecipientTypeEnum.valueOf(log.getRecipientType()),
                    log.getRecipientId(),
                    log.getRecipientEmails(),
                    log.getUserId(),
                    log.getApplicationId(),
                    log.getAmendmentId(),
                    log.getCallId()
            );

            List<String> recipients = Utils.commaSeparatedStringToList(log.getRecipientEmails());
            CallEntity call = callService.validateCall(log.getCallId());
            emailNotificationDao.sendMail(
                    call.getHub().getId(),
                    log.getEmailSubject(),
                    log.getEmailBody(),
                    recipients,
                    emailLogRequest
            );
        }
        EmailSendResponse emailSendResponse = buildEmailSendResponseFromRequest(request);
        emailResendResponseBean.setEmailSendResponse(emailSendResponse);

        if (Boolean.TRUE.equals(emailSendResponse.getIsEmailSend())){
            updateEmailSendStatusIfSuccessful(emailSendResponse);
        }
        return emailResendResponseBean;
    }

    private void updateEmailSendStatusIfSuccessful(EmailSendResponse emailSendResponse){
        Long actionId = emailSendResponse.getUserActionId();

        EmailLogEntity emailLog = emailLogRepository.findTopByUserActionIdAndEmailServiceTypeAndSendStatusOrderByIdDesc(
                actionId,
                EmailServiceTypeEnum.PEC_SERVICE.getValue(),
                StatusTypeEnum.SUCCESS.getValue()
        );
        if (emailLog != null) {
            switch (emailSendResponse.getEmailScenario()) {
                case APPLICATION_AMENDMENT_REQUESTED:
                case APPLICATION_AMENDMENT_REMINDER:
                    updateApplicationAmendmentStatus(emailLog, emailSendResponse.getEmailScenario().getValue());
                    break;

                case USER_CREATION:
                case PASSWORD_RESET_REQUEST:
                    updateUserEmailStatus(emailLog, emailSendResponse.getEmailScenario().getValue());
                    break;

                case APPLICATION_ADMISSIBLE:
                case APPLICATION_REJECTED:
                    updateApplicationEvaluationStatus(emailLog, emailSendResponse.getEmailScenario().getValue());
                    break;

                default:
                    log.warn("Unhandled email scenario: {}", emailSendResponse.getEmailScenario());
            }
        }
    }

    private void updateApplicationAmendmentStatus(EmailLogEntity log, String scenario) {
        if (log.getAmendmentId() != null) {
            applicationAmendmentRequestRepository.findById(log.getAmendmentId()).ifPresent(amendment -> {
                if (updateEmailSendResponse(amendment.getEmailSendResponse(), scenario)) {
                    applicationAmendmentRequestRepository.save(amendment);
                }
            });
        }
    }

    private void updateApplicationEvaluationStatus(EmailLogEntity log, String scenario) {
        if (log.getApplicationId() != null) {
            ApplicationEvaluationEntity evaluation = applicationEvaluationRepository.findByApplicationId(log.getApplicationId());
            if (evaluation != null && updateEmailSendResponse(evaluation.getEmailSendResponse(), scenario)) {
                applicationEvaluationRepository.save(evaluation);
            }
        }
    }

    private void updateUserEmailStatus(EmailLogEntity log, String scenario) {
        if (log.getUserId() != null) {
            userRepository.findById(log.getUserId()).ifPresent(user -> {
                if (updateEmailSendResponse(user.getEmailSendResponse(), scenario)) {
                    userRepository.save(user);
                }
            });
        }
    }




    private boolean updateEmailSendResponse(List<EmailSendResponse> responses, String scenario) {
        if (responses == null || responses.isEmpty()) return false;

        for (Iterator<EmailSendResponse> iterator = responses.iterator(); iterator.hasNext(); ) {
            EmailSendResponse response = iterator.next();
            if (scenario.equals(response.getEmailScenario().getValue())) {
                iterator.remove();  // remove only the first match
                return true;
            }
        }
        return false;
    }




    public EmailSendResponse buildEmailSendResponseFromRequest(HttpServletRequest request) {
        Long userActionId = (Long) request.getAttribute(GepafinConstant.USER_ACTION_ID);
        List<EmailLogEntity> emailLogs = emailLogRepository.findByUserActionIdAndEmailServiceType(userActionId,EmailServiceTypeEnum.PEC_SERVICE.getValue());

        boolean allSuccess = true;
        String emailScenario = null;

        for (EmailLogEntity log : emailLogs) {

            if (emailScenario == null) {
                emailScenario = log.getEmailType();
            }
            boolean isSuccess = StatusTypeEnum.SUCCESS.getValue().equals(log.getSendStatus());
            if (Boolean.FALSE.equals(isSuccess)) {
                allSuccess = false;
                break;
            }
        }

        return buildResponse(userActionId, allSuccess, emailScenario);
    }

    private EmailSendResponse buildResponse(Long userActionId, boolean allSuccess, String emailScenario) {
        EmailSendResponse response = new EmailSendResponse();
        response.setUserActionId(userActionId);
        response.setIsEmailSend(allSuccess);
        response.setEmailScenario(emailScenario != null ? EmailScenarioTypeEnum.valueOf(emailScenario) : null);
        return response;
    }






}