package at.gv.egiz.moazs;

import at.gv.e_government.reference.namespace.zustellung.msg.phase2._20181206_.DeliveryAnswerType.DeliveryAnswerTypeBuilder;
import at.gv.e_government.reference.namespace.zustellung.msg.phase2._20181206_.DeliveryRequestStatusType;
import at.gv.e_government.reference.namespace.zustellung.msg.phase2._20181206_.DeliveryRequestStatusType.DeliveryRequestStatusTypeBuilder;
import at.gv.e_government.reference.namespace.zustellung.msg.phase2._20181206_.DeliveryRequestStatusType.Error.ErrorBuilder;
import at.gv.e_government.reference.namespace.zustellung.msg.phase2._20181206_.ErrorInfoType.ErrorInfoTypeBuilder;
import at.gv.e_government.reference.namespace.zustellung.mzs.app2mzs.App2MzsPortType;
import at.gv.e_government.reference.namespace.zustellung.mzs.app2mzs_.DeliveryRequestType;
import at.gv.egiz.moazs.pipeline.DeliveryPipeline;
import at.gv.egiz.moazs.repository.DeliveryRepository;
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 java.text.MessageFormat.format;
import static java.util.concurrent.CompletableFuture.supplyAsync;

@Service
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 static final String MZSTNS = "http://reference.e-government.gv.at/namespace/zustellung/mzs/app2mzs#";

    private final DeliveryRepository repository;
    private final DeliveryPipeline pipeline;
    private final Mzs2AppClient appClient;
    private final DeliveryPreprocessor preprocessor;

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

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

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

        var future = supplyAsync(() -> preprocessor.preProcess(deliveryRequest))
                .thenApply((request) -> process(request));

        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 ) {
            logger.error("Could not deliver request.", e);
            var message = format("An error occured while delivering request: {0}", e.getMessage());
            return generateErrorResponse(appDeliveryID, message);
        }

    }

    private DeliveryRequestStatusType generatePartialSuccessResponse(String appDeliveryId) {

        var answer = new DeliveryAnswerTypeBuilder()
                .withAppDeliveryID(appDeliveryId)
                .build();

        return new DeliveryRequestStatusTypeBuilder()
                .withPartialSuccess(answer)
                .build();
    }

    private DeliveryRequestStatusType generateErrorResponse(String appDeliveryId, String message) {

        var info = new ErrorInfoTypeBuilder()
                .withCode("500")
                .withText(message)
                .build();

        var error = new ErrorBuilder()
                .withAppDeliveryID(appDeliveryId)
                .withErrorInfo(info)
                .build();

        return new DeliveryRequestStatusTypeBuilder()
                .withError(error)
                .build();
    }

    private DeliveryRequestStatusType process(DeliveryRequestType deliveryRequest) throws RuntimeException {

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

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

        return repository.getDeliveryRequestStatus(appDeliveryID)
                .orElseThrow(() -> new RuntimeException("Could not get a response for appDeliveryId = " + appDeliveryID));

    }

}