/*
 * Copyright © 2017 Orange, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.transportpce.servicehandler.listeners;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import org.opendaylight.mdsal.binding.api.NotificationPublishService;
import org.opendaylight.transportpce.common.OperationResult;
import org.opendaylight.transportpce.pce.service.PathComputationService;
import org.opendaylight.transportpce.servicehandler.ServiceInput;
import org.opendaylight.transportpce.servicehandler.service.PCEServiceWrapper;
import org.opendaylight.transportpce.servicehandler.service.ServiceDataStoreOperations;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.renderer.rev201125.RendererRpcResultSp;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.renderer.rev201125.TransportpceRendererListener;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.servicehandler.rev201125.ServiceRpcResultSh;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.servicehandler.rev201125.ServiceRpcResultShBuilder;
import org.opendaylight.yang.gen.v1.http.org.openroadm.common.service.types.rev190531.ServiceNotificationTypes;
import org.opendaylight.yang.gen.v1.http.org.openroadm.common.state.types.rev191129.State;
import org.opendaylight.yang.gen.v1.http.org.openroadm.equipment.states.types.rev191129.AdminStates;
import org.opendaylight.yang.gen.v1.http.org.openroadm.service.rev190531.service.list.Services;
import org.opendaylight.yang.gen.v1.nbi.notifications.rev201130.PublishNotificationService;
import org.opendaylight.yang.gen.v1.nbi.notifications.rev201130.PublishNotificationServiceBuilder;
import org.opendaylight.yang.gen.v1.nbi.notifications.rev201130.notification.service.ServiceAEndBuilder;
import org.opendaylight.yang.gen.v1.nbi.notifications.rev201130.notification.service.ServiceZEndBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Calls to listen to Renderer notifications.
 *
 * @author Martial Coulibaly ( martial.coulibaly@gfi.com ) on behalf of Orange
 *
 */
public class RendererListenerImpl implements TransportpceRendererListener {

    private static final String TOPIC = "RendererListener";
    private static final Logger LOG = LoggerFactory.getLogger(RendererListenerImpl.class);
    private RendererRpcResultSp serviceRpcResultSp;
    private ServiceDataStoreOperations serviceDataStoreOperations;
    private ServiceInput input;
    private PCEServiceWrapper pceServiceWrapper;
    private Boolean tempService;
    private NotificationPublishService notificationPublishService;

    public RendererListenerImpl(PathComputationService pathComputationService,
            NotificationPublishService notificationPublishService) {
        this.pceServiceWrapper = new PCEServiceWrapper(pathComputationService, notificationPublishService);
        setServiceInput(null);
        setTempService(false);
        this.notificationPublishService = notificationPublishService;
    }

    @Override
    public void onRendererRpcResultSp(RendererRpcResultSp notification) {
        if (compareServiceRpcResultSp(notification)) {
            LOG.warn("ServiceRpcResultSp already wired !");
            return;
        }
        serviceRpcResultSp = notification;
        int notifType = serviceRpcResultSp.getNotificationType().getIntValue();
        LOG.info("Renderer '{}' Notification received : {}", serviceRpcResultSp.getNotificationType().getName(),
                notification);
        switch (notifType) {
            /* service-implementation-request. */
            case 3 :
                onServiceImplementationResult(notification);
                break;
            /* service-delete. */
            case 4 :
                onServiceDeleteResult(notification);
                break;
            default:
                break;
        }
    }

    /**
     * Process service delete result for serviceName.
     * @param notification RendererRpcResultSp
     */
    private void onServiceDeleteResult(RendererRpcResultSp notification) {
        switch (serviceRpcResultSp.getStatus()) {
            case Successful:
                LOG.info("Service '{}' deleted !", notification.getServiceName());
                break;
            case Failed:
                LOG.error("Renderer service delete failed !");
                return;
            case  Pending:
                LOG.warn("Renderer service delete returned a Penging RpcStatusEx code!");
                return;
            default:
                LOG.error("Renderer service delete returned an unknown RpcStatusEx code!");
                return;
        }
        Services service = serviceDataStoreOperations.getService(notification.getServiceName()).get();
        PublishNotificationService nbiNotification = new PublishNotificationServiceBuilder()
                .setServiceName(service.getServiceName())
                .setServiceAEnd(new ServiceAEndBuilder(service.getServiceAEnd()).build())
                .setServiceZEnd(new ServiceZEndBuilder(service.getServiceZEnd()).build())
                .setCommonId(service.getCommonId())
                .setConnectionType(service.getConnectionType())
                .setResponseFailed("")
                .setMessage("Service deleted !")
                .setOperationalState(org.opendaylight.yang.gen.v1.http
                        .org.openroadm.common.state.types.rev181130.State.Degraded)
                .setTopic(TOPIC)
                .build();
        sendNbiNotification(nbiNotification);
        LOG.info("Service '{}' deleted !", notification.getServiceName());
        if (this.input == null) {
            LOG.error("ServiceInput parameter is null !");
            return;
        }
        LOG.info("sending PCE cancel resource reserve for '{}'",  this.input.getServiceName());
        this.pceServiceWrapper.cancelPCEResource(this.input.getServiceName(),
                ServiceNotificationTypes.ServiceDeleteResult);
        sendServiceHandlerNotification(notification, ServiceNotificationTypes.ServiceDeleteResult);
    }

    /**
     * Process service implementation result for serviceName.
     * @param notification RendererRpcResultSp
     */
    private void onServiceImplementationResult(RendererRpcResultSp notification) {
        switch (serviceRpcResultSp.getStatus()) {
            case Successful:
                onSuccededServiceImplementation(notification);
                break;
            case Failed:
                onFailedServiceImplementation(notification.getServiceName());
                break;
            case  Pending:
                LOG.warn("Service Implementation still pending according to RpcStatusEx");
                break;
            default:
                LOG.warn("Service Implementation has an unknown RpcStatusEx code");
                break;
        }
    }

    /**
     * Process succeeded service implementation for service.
     * @param notification RendererRpcResultSp
     */
    private void onSuccededServiceImplementation(RendererRpcResultSp notification) {
        LOG.info("Service implemented !");
        PublishNotificationService nbiNotification = new PublishNotificationServiceBuilder()
                .setServiceName(input.getServiceName())
                .setServiceAEnd(new ServiceAEndBuilder(input.getServiceAEnd()).build())
                .setServiceZEnd(new ServiceZEndBuilder(input.getServiceZEnd()).build())
                .setCommonId(input.getCommonId()).setConnectionType(input.getConnectionType())
                .setResponseFailed("")
                .setMessage("Service implemented !")
                .setOperationalState(org.opendaylight.yang.gen.v1.http
                        .org.openroadm.common.state.types.rev181130.State.InService)
                .setTopic(TOPIC)
                .build();
        sendNbiNotification(nbiNotification);
        if (serviceDataStoreOperations == null) {
            LOG.debug("serviceDataStoreOperations is null");
            return;
        }
        OperationResult operationResult = null;
        if (tempService) {
            operationResult = this.serviceDataStoreOperations.modifyTempService(
                    serviceRpcResultSp.getServiceName(), State.InService, AdminStates.InService);
            if (!operationResult.isSuccess()) {
                LOG.warn("Temp Service status not updated in datastore !");
            }
        } else {
            operationResult = this.serviceDataStoreOperations.modifyService(
                    serviceRpcResultSp.getServiceName(), State.InService, AdminStates.InService);
            if (!operationResult.isSuccess()) {
                LOG.warn("Service status not updated in datastore !");
            } else {
                sendServiceHandlerNotification(notification, ServiceNotificationTypes.ServiceCreateResult);
            }
        }
    }

    /**
     * Create and send service handler notification.
     * @param notification RendererRpcResultSp
     * @param type ServiceNotificationTypes
     */
    private void sendServiceHandlerNotification(RendererRpcResultSp notification, ServiceNotificationTypes type) {
        try {
            ServiceRpcResultSh serviceHandlerNotification = new ServiceRpcResultShBuilder()
                    .setAToZDirection(notification.getAToZDirection())
                    .setZToADirection(notification.getZToADirection())
                    .setServiceName(notification.getServiceName())
                    .setStatus(notification.getStatus())
                    .setStatusMessage(notification.getStatusMessage())
                    .setNotificationType(type)
                    .build();
            LOG.debug("Service update in datastore OK, sending notification {}", serviceHandlerNotification);
            notificationPublishService.putNotification(
                    serviceHandlerNotification);
        } catch (InterruptedException e) {
            LOG.warn("Something went wrong while sending notification for sevice {}",
                    serviceRpcResultSp.getServiceName(), e);
            Thread.currentThread().interrupt();
        }
    }

    /**
     * Process failed service implementation for serviceName.
     * @param serviceName String
     */
    private void onFailedServiceImplementation(String serviceName) {
        LOG.error("Renderer implementation failed !");
        OperationResult deleteServicePathOperationResult =
                this.serviceDataStoreOperations.deleteServicePath(serviceName);
        if (!deleteServicePathOperationResult.isSuccess()) {
            LOG.warn("Service path was not removed from datastore!");
        }
        if (tempService) {
            OperationResult deleteServiceOperationResult =
                    this.serviceDataStoreOperations.deleteTempService(serviceName);
            if (!deleteServiceOperationResult.isSuccess()) {
                LOG.warn("Temp Service was not removed from datastore!");
            }
        } else {
            OperationResult deleteServiceOperationResult =
                    this.serviceDataStoreOperations.deleteService(serviceName);
            if (!deleteServiceOperationResult.isSuccess()) {
                LOG.warn("Service was not removed from datastore!");
            }
        }
    }

    @SuppressFBWarnings(
        value = "ES_COMPARING_STRINGS_WITH_EQ",
        justification = "false positives, not strings but real object references comparisons")
    private Boolean compareServiceRpcResultSp(RendererRpcResultSp notification) {
        if (serviceRpcResultSp == null) {
            return false;
        }
        if (serviceRpcResultSp.getNotificationType() != notification.getNotificationType()) {
            return false;
        }
        if (serviceRpcResultSp.getServiceName() != notification.getServiceName()) {
            return false;
        }
        if (serviceRpcResultSp.getStatus() != notification.getStatus()) {
            return false;
        }
        if (serviceRpcResultSp.getStatusMessage() != notification.getStatusMessage()) {
            return false;
        }
        return true;
    }

    public void setServiceInput(ServiceInput serviceInput) {
        this.input = serviceInput;
    }

    public void setserviceDataStoreOperations(ServiceDataStoreOperations serviceData) {
        this.serviceDataStoreOperations = serviceData;
    }

    public void setTempService(Boolean tempService) {
        this.tempService = tempService;
    }

    /**
     * Send notification to NBI notification in order to publish message.
     * @param service PublishNotificationService
     */
    private void sendNbiNotification(PublishNotificationService service) {
        try {
            notificationPublishService.putNotification(service);
        } catch (InterruptedException e) {
            LOG.warn("Cannot send notification to nbi", e);
            Thread.currentThread().interrupt();
        }
    }
}