package net.gepafin.tendermanagement.dao;
import jakarta.persistence.criteria.Predicate;
import jakarta.servlet.http.HttpServletRequest;
import net.gepafin.tendermanagement.config.Translator;
import net.gepafin.tendermanagement.constants.GepafinConstant;
import net.gepafin.tendermanagement.entities.ApplicationEntity;
import net.gepafin.tendermanagement.entities.AssignedApplicationsEntity;
import net.gepafin.tendermanagement.entities.UserEntity;
import net.gepafin.tendermanagement.enums.ApplicationStatusTypeEnum;
import net.gepafin.tendermanagement.enums.AssignedApplicationEnum;
import net.gepafin.tendermanagement.model.request.AssignedApplicationsRequest;
import net.gepafin.tendermanagement.model.response.AssignedApplicationsResponse;
import net.gepafin.tendermanagement.repositories.ApplicationRepository;
import net.gepafin.tendermanagement.repositories.AssignedApplicationsRepository;
import net.gepafin.tendermanagement.service.ApplicationService;
import net.gepafin.tendermanagement.service.UserService;
import net.gepafin.tendermanagement.util.DateTimeUtil;
import net.gepafin.tendermanagement.util.Validator;
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.data.jpa.domain.Specification;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.util.List;
import java.util.stream.Collectors;

import static net.gepafin.tendermanagement.util.Utils.log;
import static net.gepafin.tendermanagement.util.Utils.setIfUpdated;

@Component
public class AssignedApplicationsDao {

    @Autowired
    private ApplicationService applicationService;

    @Autowired
    private ApplicationRepository applicationRepository;

    @Autowired
    private AssignedApplicationsRepository assignedApplicationsRepository;

    @Autowired
    private UserService userService;
    
    @Autowired
    private Validator validator;

    public AssignedApplicationsResponse createAssignedApplications(Long applicationId, Long userId, UserEntity assignedByUser, AssignedApplicationsRequest assignedApplicationsRequest){
        log.info("Assigning application to pre-Instructor with details: {}", applicationId,userId);

        AssignedApplicationsEntity assignedApplications = assignedApplicationsRepository.findByApplicationIdAndIsDeletedFalse(applicationId).orElse(null);
        if(assignedApplications!=null){
            throw new CustomValidationException(Status.BAD_REQUEST, Translator.toLocale(GepafinConstant.APPLICATION_ALREADY_ASSIGNED));
        }
        ApplicationEntity application = applicationService.validateApplication(applicationId);


        if (Boolean.FALSE.equals(ApplicationStatusTypeEnum.SUBMIT.getValue().equals(application.getStatus()))) {
            throw new CustomValidationException(
                    Status.BAD_REQUEST,
                    Translator.toLocale(GepafinConstant.INVALID_APPLICATION_STATUS)
            );
        }
        application.setStatus(ApplicationStatusTypeEnum.EVALUATION.getValue());
        applicationRepository.save(application);
        UserEntity user = userService.validateUser(userId);
        AssignedApplicationsEntity assignment = createAssignmentEntity(application, user.getId(), assignedByUser, assignedApplicationsRequest);
        AssignedApplicationsResponse assignApplicationToInstructorResponse = convertEntityToResponse(assignment);

        log.info("Application assigned succesfully {}", assignApplicationToInstructorResponse);
        return assignApplicationToInstructorResponse;
    }

    public AssignedApplicationsEntity createAssignmentEntity(ApplicationEntity application, Long userId, UserEntity assignedByUser, AssignedApplicationsRequest assignedApplicationsRequest){
        AssignedApplicationsEntity assignApplication= new AssignedApplicationsEntity();
        assignApplication.setApplication(application);
        assignApplication.setAssignedBy(assignedByUser.getId());
        assignApplication.setUserId(userId);
        assignApplication.setStatus(AssignedApplicationEnum.ASSIGNED.getValue());
        if(assignedApplicationsRequest.getStatus() != null) {
        	 assignApplication.setStatus(assignedApplicationsRequest.getStatus().getValue());
        }
        assignApplication.setNote(assignedApplicationsRequest.getNote());
        assignApplication.setIsDeleted(false);
        assignApplication.setAssignedAt(DateTimeUtil.DateServerToUTC(LocalDateTime.now()));
        AssignedApplicationsEntity assignedApplicationsEntity = saveAssignedApplication(assignApplication);
        return assignedApplicationsEntity;

    }
    public AssignedApplicationsEntity saveAssignedApplication(AssignedApplicationsEntity assignedApplicationsEntity){
        AssignedApplicationsEntity assignedApplication= assignedApplicationsRepository.save(assignedApplicationsEntity);
        return assignedApplication;
    }

    public AssignedApplicationsResponse convertEntityToResponse(AssignedApplicationsEntity assignedApplications){
        AssignedApplicationsResponse assignedApplicationsResponse = new AssignedApplicationsResponse();
        assignedApplicationsResponse.setId(assignedApplications.getId());
        assignedApplicationsResponse.setApplicationId(assignedApplications.getApplication().getId());

        ApplicationEntity application = applicationService.validateApplication(assignedApplications.getApplication().getId());
        String callName = application.getCall() != null ? application.getCall().getName() : "";
        LocalDateTime callEndDate = application.getCall().getEndDate();
        LocalDateTime callStartDate = application.getCall().getStartDate();

        Long protocolNumber = (application.getProtocol() != null && application.getProtocol().getProtocolNumber() != null)
                ? application.getProtocol().getProtocolNumber()
                : 0;
        LocalDateTime submissionDate = application.getSubmissionDate();
        UserEntity userEntity = userService.validateUser(application.getUserId());

        String firstName = userEntity.getBeneficiary() != null ? userEntity.getBeneficiary().getFirstName() : null;
        String lastName = userEntity.getBeneficiary() != null ? userEntity.getBeneficiary().getLastName() : null;

        String beneficiaryName = (firstName != null && !firstName.isBlank() ? firstName : "") +
                (lastName != null && !lastName.isBlank() ? " " + lastName : "");

        beneficiaryName = beneficiaryName.isBlank() ? "" : beneficiaryName;

        assignedApplicationsResponse.setAssignedBy(assignedApplications.getAssignedBy());
        assignedApplicationsResponse.setUserId(assignedApplications.getUserId());
        assignedApplicationsResponse.setCreatedDate(assignedApplications.getCreatedDate());
        assignedApplicationsResponse.setUpdatedDate(assignedApplications.getUpdatedDate());
        assignedApplicationsResponse.setNote(assignedApplications.getNote());
        assignedApplicationsResponse.setStatus(AssignedApplicationEnum.valueOf(assignedApplications.getStatus()));
        assignedApplicationsResponse.setAssignedAt(assignedApplications.getAssignedAt());
        assignedApplicationsResponse.setProtocolNumber(protocolNumber);
        assignedApplicationsResponse.setCallName(callName);
        assignedApplicationsResponse.setBeneficiaryName(beneficiaryName);
        assignedApplicationsResponse.setSubmissionDate(submissionDate);
        assignedApplicationsResponse.setCallEndDate(callEndDate);
        assignedApplicationsResponse.setCallStartDate(callStartDate);

        return assignedApplicationsResponse;
    }

    public AssignedApplicationsEntity validateAssignedApplication(Long id){
        AssignedApplicationsEntity assignedApplication = assignedApplicationsRepository.findByIdAndIsDeletedFalse(id).orElseThrow(()->
            new ResourceNotFoundException(Status.NOT_FOUND,Translator.toLocale(GepafinConstant.ASSIGNED_APPLICATION_NOT_FOUND_MSG)));
           return assignedApplication;
    }

    public void deleteById(HttpServletRequest request, Long id) {
        log.info("Deleting assigned application with ID: {}", id);
        AssignedApplicationsEntity assignedApplicationsEntity= validateAssignedApplication(id);
        validator.validatePreInstructor(request, assignedApplicationsEntity.getUserId());
        assignedApplicationsEntity.setIsDeleted(true);
        assignedApplicationsEntity= saveAssignedApplication(assignedApplicationsEntity);
        log.info("Assigned Application deleted with ID: {}", id);
    }

        public List<AssignedApplicationsResponse> getAllAssignedApplications(HttpServletRequest request, Long userId) {
        	UserEntity user = validator.validateUser(request);
        	if(validator.checkIsPreInstructor() && userId == null) {
        		throw new CustomValidationException(Status.BAD_REQUEST, Translator.toLocale(GepafinConstant.USER_ID_NOT_NULL_MSG));
        	}
        	if(userId != null) {        		
        		validator.validatePreInstructor(request, userId);
        	}
            Specification<AssignedApplicationsEntity> spec = search(user.getHub().getId() ,userId);
            List<AssignedApplicationsEntity> assignedApplicationsEntityList = assignedApplicationsRepository.findAll(spec);
            return assignedApplicationsEntityList.stream()
                    .map(entity -> convertEntityToResponse(entity))
                    .collect(Collectors.toList());
        }
        private Specification<AssignedApplicationsEntity> search(Long hubId, Long userId) {
            return (root, query, builder) -> {
                Predicate predicate = builder.isFalse(root.get("isDeleted"));
                if (userId != null) {
                    predicate = builder.and(predicate, builder.equal(root.get("userId"), userId));
                }
                predicate = builder.and(predicate, builder.equal(root.get("application").get("hubId"), hubId));
                return predicate;
            };
        }


    public AssignedApplicationsResponse updateAssignedApplication(HttpServletRequest request,
            Long id, AssignedApplicationsRequest updateRequest) {
    	UserEntity updatedByUser = validator.validateUser(request); 
        log.info("Updating assigned application with ID: {}", id);
        AssignedApplicationsEntity existingAssignment = validateAssignedApplication(id);
        validator.validatePreInstructor(request, existingAssignment.getUserId());
        setIfUpdated(existingAssignment::getNote, existingAssignment::setNote, updateRequest.getNote());
        setIfUpdated(existingAssignment::getStatus, existingAssignment::setStatus, updateRequest.getStatus().name());
        setIfUpdated(existingAssignment::getAssignedBy, existingAssignment::setAssignedBy, updatedByUser.getId());

        existingAssignment.setUpdatedDate(DateTimeUtil.DateServerToUTC(LocalDateTime.now()));

        AssignedApplicationsEntity updatedAssignment = saveAssignedApplication(existingAssignment);
        AssignedApplicationsResponse response = convertEntityToResponse(updatedAssignment);
        log.info("Assigned application updated successfully: {}", response);
        return response;
    }

    public AssignedApplicationsResponse getAssignedApplicationById(HttpServletRequest request, Long id) {
        log.info("Fetching assigned application with ID: {}", id);
        AssignedApplicationsEntity assignedApplication = validateAssignedApplication(id);
        validator.validatePreInstructor(request, assignedApplication.getUserId());
        AssignedApplicationsResponse response = convertEntityToResponse(assignedApplication);
        log.info("Assigned application fetched successfully: {}", response);
        return response;
    }

}