/*******************************************************************************
 * Copyright 2019 Graz University of Technology
 * MOA ZS has been developed in a cooperation between EGIZ
 * and Graz University of Technology.
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.gv.egiz.moazs.service;
import at.gv.egiz.moazs.backend.MsgResponseBackend;
import at.gv.egiz.moazs.repository.DeliveryRepository;
import at.gv.egiz.moazs.scheme.MsgResponse;
import at.gv.egiz.moazs.scheme.NameSpace;
import at.gv.egiz.moazs.scheme.NotificationResponse;
import at.gv.egiz.moazs.scheme.RequestStatusResponse;
import at.gv.zustellung.msg.xsd.*;
import org.apache.cxf.annotations.SchemaValidation;
import org.apache.cxf.binding.soap.SoapFault;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.task.TaskExecutor;
import org.springframework.stereotype.Service;

import javax.xml.namespace.QName;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

import static at.gv.zustellung.msg.xsd.DeliveryNotificationACKType.deliveryNotificationACKTypeBuilder;
import static at.gv.zustellung.msg.xsd.DeliveryRequestStatusACKType.deliveryRequestStatusACKTypeBuilder;
import static at.gv.zustellung.msg.xsd.GetVersionResponse.getVersionResponseBuilder;
import static java.lang.String.format;
import static java.util.concurrent.CompletableFuture.runAsync;

/**
 * @author Christof Rabensteiner
 *
 */
@Service
@SchemaValidation(type = SchemaValidation.SchemaValidationType.BOTH)
    @org.apache.cxf.feature.Features (features = "org.apache.cxf.ext.logging.LoggingFeature")
public class MsgService implements Zuse2AppPort {

    private static final Logger log = LoggerFactory.getLogger(MsgService.class);
    private static final String BACKEND_ERROR_MSG = "Could not process %s.";

    private final DeliveryRepository repository;
    private final MsgResponseBackend backend;
    private final TaskExecutor taskExecutor;

    @Autowired
    public MsgService(DeliveryRepository repository, MsgResponseBackend msgResponseBackend, TaskExecutor taskExecutor) {
        this.repository = repository;
        this.backend = msgResponseBackend;
        this.taskExecutor = taskExecutor;
    }

    @Override
    public GetVersionResponse getVersion(SimpleRequestType getVersionRequest) {
        return getVersionResponseBuilder()
                .withVersion(NameSpace.MSG_VERSION)
                .build();
    }

    @Override
    public DeliveryRequestStatusACKType status(DeliveryRequestStatusType status) {
        var response = new RequestStatusResponse(status);
        try {
            sendToBackend(response).get();
            return statusAck(response.getAppDeliveryID(), response.getZSDeliveryID());
        } catch (InterruptedException | ExecutionException e) {
            var message = format(BACKEND_ERROR_MSG, "request status");
            log.error(message, e);
            throw toFault(e, message);
        }
    }

    private DeliveryRequestStatusACKType statusAck(String appDeliveryID, String zsDeliveryID) {
        return deliveryRequestStatusACKTypeBuilder()
                .withAppDeliveryID(appDeliveryID)
                .withZSDeliveryID(zsDeliveryID)
                .withVersion(NameSpace.MSG_VERSION)
                .build();
    }

    @Override
    public DeliveryNotificationACKType notification(DeliveryNotificationType notification) {
        var response = new NotificationResponse(notification);
        try {
            sendToBackend(response).get();
            return notificationAck(response.getAppDeliveryID(), response.getZSDeliveryID());
        } catch (InterruptedException | ExecutionException e) {
            var message = format(BACKEND_ERROR_MSG, "delivery notification");
            log.error(message, e);
            throw toFault(e, message);
        }
    }

    private RuntimeException toFault(Exception e, String fallbackMessage) {
        Throwable cause = (e.getCause() != null) ? e.getCause() : e;
        return new SoapFault(fallbackMessage, cause, new QName("faultcode"));
    }

    private CompletableFuture<Void> sendToBackend(MsgResponse response) {
        return runAsync(() -> repository.store(response), taskExecutor)
            .thenCompose(ignore -> backend.accept(response.getResponseID()));
    }

    private DeliveryNotificationACKType notificationAck(String appDeliveryID, String zsDeliveryID) {
        return deliveryNotificationACKTypeBuilder()
                .withAppDeliveryID(appDeliveryID)
                .withZSDeliveryID(zsDeliveryID)
                .withVersion(NameSpace.MSG_VERSION)
                .build();
    }


}