package gr.cite.notification.integrationevent.inbox.userremoval;

import gr.cite.commons.web.oidc.principal.CurrentPrincipalResolver;
import gr.cite.notification.audit.AuditableAction;
import gr.cite.notification.common.JsonHandlingService;
import gr.cite.notification.common.scope.fake.FakeRequestScope;
import gr.cite.notification.common.scope.tenant.TenantScope;
import gr.cite.notification.data.TenantEntity;
import gr.cite.notification.errorcode.ErrorThesaurusProperties;
import gr.cite.notification.integrationevent.inbox.EventProcessingStatus;
import gr.cite.notification.integrationevent.inbox.InboxPrincipal;
import gr.cite.notification.integrationevent.inbox.IntegrationEventProperties;
import gr.cite.notification.model.Tenant;
import gr.cite.notification.query.TenantQuery;
import gr.cite.notification.service.user.UserService;
import gr.cite.tools.auditing.AuditService;
import gr.cite.tools.data.query.QueryFactory;
import gr.cite.tools.exception.MyValidationException;
import gr.cite.tools.fieldset.BaseFieldSet;
import gr.cite.tools.logging.LoggerService;
import jakarta.persistence.EntityManager;
import jakarta.persistence.EntityManagerFactory;
import jakarta.persistence.EntityTransaction;
import jakarta.persistence.OptimisticLockException;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Scope;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.stereotype.Component;

import java.util.AbstractMap;
import java.util.Map;

@Component
@Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class UserRemovalIntegrationEventHandlerImpl implements UserRemovalIntegrationEventHandler {

    private static final LoggerService logger = new LoggerService(LoggerFactory.getLogger(UserRemovalIntegrationEventHandlerImpl.class));

    private final JsonHandlingService jsonHandlingService;

    private final ApplicationContext applicationContext;

    private final ErrorThesaurusProperties errors;

    private final MessageSource messageSource;

    public UserRemovalIntegrationEventHandlerImpl(
            JsonHandlingService jsonHandlingService,
            ApplicationContext applicationContext,
            ErrorThesaurusProperties errors,
            MessageSource messageSource
    ) {
        this.jsonHandlingService = jsonHandlingService;
        this.applicationContext = applicationContext;
        this.errors = errors;
        this.messageSource = messageSource;
    }

    @Override
    public EventProcessingStatus handle(IntegrationEventProperties properties, String message) {
        UserRemovalIntegrationEvent event = this.jsonHandlingService.fromJsonSafe(UserRemovalIntegrationEvent.class, message);
        if (event == null)
            return EventProcessingStatus.Error;
        if (event.getUserId() == null)
            throw new MyValidationException(this.errors.getModelValidation().getCode(), "userId", messageSource.getMessage("Validation_Required", new Object[]{"userId"}, LocaleContextHolder.getLocale()));

        EntityManager entityManager = null;
        EntityTransaction transaction = null;
        try (FakeRequestScope ignored = new FakeRequestScope()) {
            try {
                QueryFactory queryFactory = this.applicationContext.getBean(QueryFactory.class);
                TenantScope scope = this.applicationContext.getBean(TenantScope.class);
                if (scope.isMultitenant() && event.getTenant() != null) {
                    TenantEntity tenant = queryFactory.query(TenantQuery.class).ids(event.getTenant()).firstAs(new BaseFieldSet().ensure(Tenant._id).ensure(Tenant._code));
                    if (tenant == null) {
                        logger.error("missing tenant from event message");
                        return EventProcessingStatus.Error;
                    }
                    scope.setTenant(event.getTenant(), tenant.getCode());
                } else if (scope.isMultitenant()) {
                    logger.error("missing tenant from event message");
                    return EventProcessingStatus.Error;
                }

                CurrentPrincipalResolver currentPrincipalResolver = this.applicationContext.getBean(CurrentPrincipalResolver.class);
                currentPrincipalResolver.push(InboxPrincipal.build(properties));

                UserRemovalConsistencyHandler userRemovalConsistencyHandler = this.applicationContext.getBean(UserRemovalConsistencyHandler.class);
                if (!(userRemovalConsistencyHandler.isConsistent(new UserRemovalConsistencyPredicates(event.getUserId()))))
                    return EventProcessingStatus.Postponed;

                EntityManagerFactory entityManagerFactory = this.applicationContext.getBean(EntityManagerFactory.class);
                entityManager = entityManagerFactory.createEntityManager();

                transaction = entityManager.getTransaction();
                transaction.begin();

                try {
                    UserService userService = this.applicationContext.getBean(UserService.class);
                    userService.deleteAndSave(event.getUserId());

                    AuditService auditService = this.applicationContext.getBean(AuditService.class);

                    auditService.track(AuditableAction.User_Delete, Map.ofEntries(
                            new AbstractMap.SimpleEntry<String, Object>("id", event.getUserId())
                    ));
                    //auditService.trackIdentity(AuditableAction.IdentityTracking_Action);

                    transaction.commit();
                } catch (Exception e) {
                    transaction.rollback();
                    throw e;
                } finally {
                    currentPrincipalResolver.pop();
                }

                transaction.commit();
            } catch (OptimisticLockException ex) {
                // we get this if/when someone else already modified the notifications. We want to essentially ignore this, and keep working
                logger.debug("Concurrency exception getting queue outbox. Skipping: {} ", ex.getMessage());
                if (transaction != null)
                    transaction.rollback();
            } catch (Exception ex) {
                logger.error("Problem getting list of queue outbox. Skipping: {}", ex.getMessage(), ex);
                if (transaction != null)
                    transaction.rollback();
            } finally {
                if (entityManager != null)
                    entityManager.close();
            }
        } catch (Exception ex) {
            logger.error("Problem getting list of queue outbox. Skipping: {}", ex.getMessage(), ex);
        }
        return null;
    }
}