package net.gepafin.tendermanagement.dao;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.persistence.criteria.Join;
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.*;
import net.gepafin.tendermanagement.enums.ApplicationEvaluationStatusTypeEnum;
import net.gepafin.tendermanagement.enums.ApplicationStatusTypeEnum;
import net.gepafin.tendermanagement.enums.AssignedApplicationEnum;
import net.gepafin.tendermanagement.model.request.ApplicationAmendmentRequest;
import net.gepafin.tendermanagement.model.request.ApplicationAmendmentRequestBean;
import net.gepafin.tendermanagement.model.request.ApplicationFormFieldRequestBean;
import net.gepafin.tendermanagement.model.response.AmendmentFormFieldResponse;
import net.gepafin.tendermanagement.model.response.ApplicationAmendmentRequestResponse;
import net.gepafin.tendermanagement.repositories.*;
import net.gepafin.tendermanagement.service.*;
import net.gepafin.tendermanagement.util.DateTimeUtil;
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.data.jpa.domain.Specification;
import org.springframework.stereotype.Component;
import java.time.temporal.ChronoUnit;


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

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

@Component
public class ApplicationAmendmentRequestDao {
    @Value("${application.amendment.expiration.days}")
    private long expirationDays;

    @Autowired
    private ApplicationService applicationService;

    @Autowired
    private FormRepository formRepository;

    @Autowired
    private UserService userService;

    @Autowired
    private DocumentService documentService;

    @Autowired
    private ApplicationFormRepository applicationFormRepository;

    @Autowired
    private ApplicationAmendmentRequestRepository applicationAmendmentRequestRepository;

    @Autowired
    private ApplicationFormFieldRepository applicationFormFieldRepository;

    @Autowired
    private DocumentRepository documentRepository;


    @Autowired
    private ApplicationEvaluationService applicationEvaluationService;

    @Autowired
    private AssignedApplicationsService assignedApplicationsService;

    @Autowired
    private ApplicationEvaluationRepository applicationEvaluationRepository;

    @Autowired
    private ApplicationRepository applicationRepository;

    @Autowired
    private AssignedApplicationsRepository assignedApplicationsRepository;

    public ApplicationAmendmentRequestResponse getApplicationDataForAmendment(HttpServletRequest request, Long applicationEvaluationId) {
        log.info("Fetching the application data for the Amendment process {}", applicationEvaluationId);
        ApplicationEvaluationEntity applicationEvaluationEntity = applicationEvaluationService.validateApplicationEvaluation(applicationEvaluationId);
        Long applicationId = applicationEvaluationEntity.getApplicationId();
        ApplicationEntity application = applicationService.validateApplication(applicationId);

        // Set common application-level details
        String callName = application.getCall().getName();
        Long protocolNumber = (application.getProtocol() != null && application.getProtocol().getProtocolNumber() != null)
                ? application.getProtocol().getProtocolNumber()
                : null;

        UserEntity userEntity = userService.validateUser(application.getUserId());
        String firstName = userEntity.getBeneficiary() != null ? userEntity.getBeneficiary().getFirstName() : "";
        String lastName = userEntity.getBeneficiary() != null ? userEntity.getBeneficiary().getLastName() : "";

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

        ApplicationAmendmentRequestResponse response = new ApplicationAmendmentRequestResponse();
        response.setId(applicationEvaluationId);
        response.setProtocolNumber(protocolNumber);
        response.setCallName(callName);
        response.setBeneficiaryName(beneficiaryName);
        response.setApplicationId(applicationId);
        response.setApplicationEvaluationId(applicationEvaluationId);

        List<ApplicationFormEntity> forms = applicationFormRepository.findByApplicationId(applicationId);
        List<AmendmentFormFieldResponse> allFormFields = new ArrayList<>();

        for (ApplicationFormEntity form : forms) {
            String content = form.getForm().getContent();
            List<Map<String, Object>> result = filterByName(content, "fileupload");
            allFormFields.addAll(getIdAndLabelFromResult(result));
        }

        response.setFormFields(allFormFields);

        return response;
    }


    public List<AmendmentFormFieldResponse> getIdAndLabelFromResult(List<Map<String, Object>> result) {
        List<AmendmentFormFieldResponse> formFieldResponses = new ArrayList<>();

        for (Map<String, Object> item : result) {
            AmendmentFormFieldResponse formFieldResponse = new AmendmentFormFieldResponse();
            formFieldResponse.setFieldId((String) item.get("id"));

            // Extract "label" value from the "settings" array
            List<Map<String, Object>> settings = (List<Map<String, Object>>) item.get("settings");
            String label = settings.stream()
                    .filter(setting -> "label".equals(setting.get("name")))
                    .map(setting -> (String) setting.get("value"))
                    .findFirst()
                    .orElse(""); // Default to empty string if not found

            if (label == null || label.trim().isEmpty()) {
                continue;
            }

            formFieldResponse.setLabel(label); // Set the label as fieldValue
            formFieldResponses.add(formFieldResponse);
        }

        return formFieldResponses;
    }


    public static List<Map<String, Object>> filterByName(String content, String target) {
        ObjectMapper objectMapper = new ObjectMapper();
        List<Map<String, Object>> filteredList = new ArrayList<>();

        try {
            List<Map<String, Object>> dataList = objectMapper.readValue(
                    content, new TypeReference<List<Map<String, Object>>>() {});

            for (Map<String, Object> data : dataList) {
                if (target.equals(data.get("name"))) {
                    filteredList.add(data);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return filteredList;
    }

    public ApplicationAmendmentRequestResponse createApplicationAmendmentRequest(Long applicationEvaluationId, ApplicationAmendmentRequest applicationAmendmentRequest){
        log.info("Submiting application data for amendment Process with details: {}", applicationEvaluationId);

        ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity = createApplicationAmendmentRequestEntity(applicationAmendmentRequest,applicationEvaluationId);
        ApplicationAmendmentRequestResponse applicationAmendmentRequestResponse = convertEntityToResponse(applicationAmendmentRequestEntity);
        log.info("Application submitted successfully for amendment", applicationAmendmentRequestResponse);
        return applicationAmendmentRequestResponse;
    }

    public ApplicationAmendmentRequestEntity createApplicationAmendmentRequestEntity(ApplicationAmendmentRequest applicationAmendmentRequest,Long applicationEvaluationId){
        ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity = new ApplicationAmendmentRequestEntity();
        applicationAmendmentRequestEntity.setNote(applicationAmendmentRequest.getNote());
        applicationAmendmentRequestEntity.setResponseDays(applicationAmendmentRequest.getResponseDays());
        ApplicationEvaluationEntity applicationEvaluationEntity = applicationEvaluationService.validateApplicationEvaluation(applicationEvaluationId);

        applicationAmendmentRequestEntity.setApplicationEvaluationEntity(applicationEvaluationEntity);
        Long applicationId = applicationEvaluationEntity.getApplicationId();
        Long assignedApplicationId = applicationEvaluationEntity.getAssignedApplicationsEntity().getId();
        applicationAmendmentRequestEntity.setApplicationId(applicationId);

        if (applicationAmendmentRequest.getFormFields() != null) {
            String fieldIdsString = applicationAmendmentRequest.getFormFields().stream()
                    .filter(AmendmentFormFieldResponse::isSelected)
                    .map(AmendmentFormFieldResponse::getFieldId)
                    .collect(Collectors.joining(","));
            applicationAmendmentRequestEntity.setFormFields(fieldIdsString);
        }

        applicationAmendmentRequestEntity.setIsEmail(false);
        applicationAmendmentRequestEntity.setIsNotification(false);
        ApplicationAmendmentRequestEntity applicationAmendment = saveApplicationAmendmentRequestEntity(applicationAmendmentRequestEntity);

        //Set Status
        applicationEvaluationEntity.setStatus(ApplicationEvaluationStatusTypeEnum.SOCCORSO.getValue());
        applicationEvaluationRepository.save(applicationEvaluationEntity);

        ApplicationEntity applicationEntity = applicationService.validateApplication(applicationId);
        applicationEntity.setStatus(ApplicationStatusTypeEnum.SOCCORSO.getValue());
        applicationRepository.save(applicationEntity);

        AssignedApplicationsEntity assignedApplicationsEntity = assignedApplicationsService.validateAssignedApplication(assignedApplicationId);
        assignedApplicationsEntity.setStatus(AssignedApplicationEnum.SOCCORSO.getValue());
        assignedApplicationsRepository.save(assignedApplicationsEntity);

        return applicationAmendment;
    }

    public ApplicationAmendmentRequestEntity saveApplicationAmendmentRequestEntity(ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity){
        ApplicationAmendmentRequestEntity applicationAmendmentRequest= applicationAmendmentRequestRepository.save(applicationAmendmentRequestEntity);
        return applicationAmendmentRequest;
    }

    public ApplicationAmendmentRequestResponse convertEntityToResponse(ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity){
        ApplicationAmendmentRequestResponse applicationAmendmentRequestResponse = new ApplicationAmendmentRequestResponse();
        applicationAmendmentRequestResponse.setId(applicationAmendmentRequestEntity.getId());
        Long applicationId= applicationAmendmentRequestEntity.getApplicationId();

        ApplicationEntity application = applicationService.validateApplication(applicationId);
        applicationAmendmentRequestResponse.setApplicationId(applicationId);
        applicationAmendmentRequestResponse.setApplicationEvaluationId(applicationAmendmentRequestEntity.getApplicationEvaluationEntity().getId());
        applicationAmendmentRequestResponse.setNote(applicationAmendmentRequestEntity.getNote());
        applicationAmendmentRequestResponse.setResponseDays(applicationAmendmentRequestEntity.getResponseDays());
        LocalDateTime startDate = applicationAmendmentRequestEntity.getCreatedDate();
        applicationAmendmentRequestResponse.setStartDate(startDate);

        LocalDateTime expirationDate = startDate.plus(expirationDays, ChronoUnit.DAYS);
        applicationAmendmentRequestResponse.setExpirationDate(expirationDate);

        applicationAmendmentRequestResponse.setSendEmail(applicationAmendmentRequestEntity.getIsEmail());
        applicationAmendmentRequestResponse.setSendNotification(applicationAmendmentRequestEntity.getIsNotification());
        String callName = application.getCall().getName();
        Long protocolNumber = (application.getProtocol() != null && application.getProtocol().getProtocolNumber() != null)
                ? application.getProtocol().getProtocolNumber()
                : null;
        UserEntity userEntity = userService.validateUser(application.getUserId());
        String firstName = userEntity.getBeneficiary() != null ? userEntity.getBeneficiary().getFirstName() : "";
        String lastName = userEntity.getBeneficiary() != null ? userEntity.getBeneficiary().getLastName() : "";

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

        beneficiaryName = beneficiaryName.isBlank() ? "" : beneficiaryName;
        applicationAmendmentRequestResponse.setCallName(callName);
        applicationAmendmentRequestResponse.setProtocolNumber(protocolNumber);
        applicationAmendmentRequestResponse.setBeneficiaryName(beneficiaryName);

        String formFieldsString = applicationAmendmentRequestEntity.getFormFields();
        List<String> storedFieldIds = (formFieldsString != null) ? Arrays.asList(formFieldsString.split(",")) : Collections.emptyList();
        List<ApplicationFormEntity> applicationForms = applicationFormRepository.findByApplicationId(application.getId());
        List<AmendmentFormFieldResponse> formFields = new ArrayList<>();
        for (ApplicationFormEntity formEntity : applicationForms) {
            String content = formEntity.getForm().getContent();
            List<Map<String, Object>> result = filterByName(content, "fileupload");

            List<AmendmentFormFieldResponse> matchingFields = getIdAndLabelFromResult(result).stream()
                    .filter(field -> storedFieldIds.contains(field.getFieldId()))
                    .collect(Collectors.toList());
            formFields.addAll(matchingFields);
        }
        applicationAmendmentRequestResponse.setFormFields(formFields);

        List<AmendmentFormFieldResponse> formField = formFields.stream()
                .map(field -> {
                    AmendmentFormFieldResponse responseField = new AmendmentFormFieldResponse();
                    responseField.setFieldId(field.getFieldId());
                    responseField.setLabel(field.getLabel());
                    responseField.setSelected(true);
                    return responseField;
                })
                .collect(Collectors.toList());

        applicationAmendmentRequestResponse.setFormFields(formField);

        return applicationAmendmentRequestResponse;
    }

    public ApplicationAmendmentRequestEntity validateApplicationAmendmentRequest(Long id){
        ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity = applicationAmendmentRequestRepository.findByIdAndIsDeletedFalse(id).orElseThrow(()->
                new ResourceNotFoundException(Status.NOT_FOUND, Translator.toLocale(GepafinConstant.APPLICATION_AMENDMENT_NOT_FOUND_MSG)));
        return applicationAmendmentRequestEntity;
    }


    public void deleteById(Long id) {
        log.info("Deleting assigned application with ID: {}", id);
        ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity= validateApplicationAmendmentRequest(id);
        applicationAmendmentRequestEntity.setIsDeleted(true);
        applicationAmendmentRequestEntity= saveApplicationAmendmentRequestEntity(applicationAmendmentRequestEntity);
        log.info(" Application amendment deleted with ID: {}", id);
    }

    public ApplicationAmendmentRequestResponse getApplicationAmendmentRequestById(Long id) {
        log.info("Fetching application amendment with ID: {}", id);
        ApplicationAmendmentRequestEntity applicationAmendmentRequestEntity = validateApplicationAmendmentRequest(id);
        ApplicationAmendmentRequestResponse response = convertEntityToResponse(applicationAmendmentRequestEntity);
        log.info("Application Amendment fetched successfully by ID: {}", response);
        return response;
    }

    public List<ApplicationAmendmentRequestResponse> getAllApplicationAmendmentRequest(Long userId) {
        Specification<ApplicationAmendmentRequestEntity> spec = search(userId);
        List<ApplicationAmendmentRequestEntity> applicationAmendmentRequestEntities =
                applicationAmendmentRequestRepository.findAll(spec);

        return applicationAmendmentRequestEntities.stream()
                .map(this::convertEntityToResponse)
                .collect(Collectors.toList());
    }

    private Specification<ApplicationAmendmentRequestEntity> search(Long userId) {
        return (root, query, builder) -> {
            Predicate predicate = builder.isFalse(root.get("isDeleted")); // Only non-deleted records

            if (userId != null) {
                Join<Object, Object> evaluationJoin = root.join("applicationEvaluationEntity");
                predicate = builder.and(predicate, builder.equal(evaluationJoin.get("userId"), userId));
            }

            return predicate; // Return final predicate
        };
    }


    public ApplicationAmendmentRequestResponse updateApplicationAmendment(
            Long id, ApplicationAmendmentRequestBean updateRequest) {

        log.info("Updating application amendement with ID: {}", id);
        ApplicationAmendmentRequestEntity existingApplicationAmendment = validateApplicationAmendmentRequest(id);

        setIfUpdated(existingApplicationAmendment::getNote, existingApplicationAmendment::setNote, updateRequest.getNote());
        if (updateRequest.getUpdatedFormFields() != null) {
            updateApplicationFormFields(existingApplicationAmendment, updateRequest.getUpdatedFormFields());
        }
        existingApplicationAmendment.setUpdatedDate(DateTimeUtil.DateServerToUTC(LocalDateTime.now()));

        ApplicationAmendmentRequestEntity updatedApplicationAmendment = saveApplicationAmendmentRequestEntity(existingApplicationAmendment);
        ApplicationAmendmentRequestResponse response = convertEntityToResponse(updatedApplicationAmendment);
        log.info("Application Amendment updated successfully: {}", response);
        return response;
    }


    private void updateApplicationFormFields(ApplicationAmendmentRequestEntity applicationAmendment, ApplicationFormFieldRequestBean updatedFormField) {
        List<String> documentIds;

        // Check if fieldValue is an array
        if (updatedFormField.getFieldValue() instanceof List) {
            documentIds = ((List<?>) updatedFormField.getFieldValue()).stream()
                    .map(Object::toString)
                    .collect(Collectors.toList());
        } else {
            log.warn("Expected fieldValue as a list but got: {}", updatedFormField.getFieldValue());
            return;
        }

        List<String> validDocumentIds = new ArrayList<>();
        for (String documentId : documentIds) {
            DocumentEntity documentEntity = documentService.validateDocument(Long.parseLong(documentId));
            if (documentEntity != null) {
                validDocumentIds.add(documentId);
            } else {
                log.warn("Document with ID {} does not exist. Skipping this ID.", documentId);
            }
        }

        if (!validDocumentIds.isEmpty()) {
            List<ApplicationFormEntity> applicationForms = applicationFormRepository.findByApplicationId(applicationAmendment.getApplicationId());

            boolean fieldUpdated = false;

            for (ApplicationFormEntity applicationForm : applicationForms) {
                Optional<ApplicationFormFieldEntity> formFieldEntityOptional = applicationFormFieldRepository
                        .findByApplicationFormIdAndFieldId(applicationForm.getId(), updatedFormField.getFieldId());

                if (formFieldEntityOptional.isPresent()) {
                    ApplicationFormFieldEntity formEntity = formFieldEntityOptional.get();
                    formEntity.setFieldValue(String.join(",", validDocumentIds));
                    applicationFormFieldRepository.save(formEntity);
                    log.info("Updated field value for application ID {} and field ID {} with document IDs {}",
                            applicationAmendment.getApplicationId(), updatedFormField.getFieldId(), String.join(",", validDocumentIds));
                    fieldUpdated = true;
                    break;
                }
            }

            if (!fieldUpdated) {
                log.warn("No ApplicationFormFieldEntity found for application ID {} and field ID {}. Skipping update.",
                        applicationAmendment.getApplicationId(), updatedFormField.getFieldId());
            }
        } else {
            log.warn("No valid document IDs found for update. Skipping field ID {}", updatedFormField.getFieldId());
        }
    }


    public List<ApplicationAmendmentRequestResponse> getAllAmendmentRequestByBeneficiaryId(Long beneficiaryId) {

        List<ApplicationAmendmentRequestEntity> entities =
                applicationAmendmentRequestRepository.findByUserId(beneficiaryId);

        return entities.stream()
                .map(this::convertEntityToResponse)
                .collect(Collectors.toList());
    }

}