package at.gv.egiz.moazs;

import at.gv.egiz.moazs.pipeline.DeliveryPipeline;
import at.gv.egiz.moazs.preprocess.DeliveryRequestAugmenter;
import at.gv.egiz.moazs.repository.DeliveryRepository;
import at.gv.zustellung.app2mzs.xsd.App2MzsPortType;
import at.gv.zustellung.app2mzs.xsd.DeliveryRequestType;
import at.gv.zustellung.msg.xsd.DeliveryRequestStatusType;
import org.apache.cxf.annotations.SchemaValidation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.jws.WebParam;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import static at.gv.egiz.moazs.MoaZSException.moaZSException;
import static at.gv.zustellung.msg.xsd.DeliveryAnswerType.deliveryAnswerTypeBuilder;
import static at.gv.zustellung.msg.xsd.DeliveryRequestStatusType.deliveryRequestStatusTypeBuilder;
import static java.lang.String.format;
import static java.util.concurrent.CompletableFuture.supplyAsync;

//todo : validate Schema in both directions.
@Service
@SchemaValidation(type = SchemaValidation.SchemaValidationType.IN)
public class App2MzsService implements App2MzsPortType {

    private static final Logger logger = LoggerFactory.getLogger(App2MzsService.class);

    //TODO move timeout and namespaces to config
    private static final int TIMEOUT_FOR_ANWSER = 10;

    private final DeliveryRepository repository;
    private final DeliveryPipeline pipeline;
    private final Mzs2AppClient appClient;
    private final DeliveryRequestAugmenter augmenter;

    @Autowired
    public App2MzsService(DeliveryRepository repository, DeliveryPipeline pipeline, Mzs2AppClient appClient,
                          DeliveryRequestAugmenter augmenter) {
        this.repository = repository;
        this.pipeline = pipeline;
        this.appClient = appClient;
        this.augmenter = augmenter;
    }

    @Override
    public DeliveryRequestStatusType app2Mzs(
            @WebParam(partName = "DeliveryRequest",
                      name = "DeliveryRequest")
                    DeliveryRequestType deliveryRequest) {

        var appDeliveryID = deliveryRequest.getMetaData().getAppDeliveryID();

        var future = supplyAsync(() -> augmenter.augment(deliveryRequest))
                .thenApply(this::process);

        try {
            return future.get(TIMEOUT_FOR_ANWSER, TimeUnit.SECONDS);
        } catch (TimeoutException e) {
            future.thenAccept(appClient::sendNotification);
            logger.info("Answer Timed Out", e);
            return generatePartialSuccessResponse(appDeliveryID);

        } catch (Exception e ) {
            var message = format("An error occurred while processing DeliveryRequest with AppDeliveryID=%s. ", appDeliveryID);
            throw new MoaZSException(message, e);

        }

    }

    private DeliveryRequestStatusType process(DeliveryRequestType deliveryRequest) {

        var appDeliveryID = deliveryRequest.getMetaData().getAppDeliveryID();
        logger.info("Receive request with appDeliveryID = {}.", appDeliveryID);

        repository.add(deliveryRequest);
        pipeline.processRequest(appDeliveryID);

        return repository.getDeliveryRequestStatus(appDeliveryID)
                .orElseThrow(() -> moaZSException("Could not get a response for AppDeliveryID=%s.", appDeliveryID));

    }

    private DeliveryRequestStatusType generatePartialSuccessResponse(String appDeliveryId) {

        var answer = deliveryAnswerTypeBuilder()
                .withAppDeliveryID(appDeliveryId)
                .build();

        return deliveryRequestStatusTypeBuilder()
                .withPartialSuccess(answer)
                .build();
    }

}