/*******************************************************************************
 * ============LICENSE_START========================================================================
 * ONAP : ccsdk feature sdnr wt
 * =================================================================================================
 * Copyright (C) 2019 highstreet technologies GmbH Intellectual Property. All rights reserved.
 * =================================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 * ============LICENSE_END==========================================================================
 ******************************************************************************/
package org.onap.ccsdk.features.sdnr.wt.websocketmanager2;

import com.google.common.util.concurrent.ListenableFuture;
import javax.servlet.ServletException;
import org.opendaylight.mdsal.binding.api.RpcProviderService;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.websocketmanager.rev150105.WebsocketEventInput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.websocketmanager.rev150105.WebsocketEventOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.websocketmanager.rev150105.WebsocketmanagerService;
import org.opendaylight.yangtools.concepts.ObjectRegistration;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
import org.opendaylight.yangtools.yang.common.RpcError.ErrorType;
import org.osgi.service.http.HttpService;
import org.osgi.service.http.NamespaceException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class WebSocketManagerProvider extends Blueprint implements WebsocketmanagerService {

    private static final Logger LOG = LoggerFactory.getLogger(WebSocketManagerProvider.class);
    private static final String APPLICATION_NAME = WebSocketManagerProvider.class.getName();
    private static final String ALIAS = "/websocket";

    private WebSocketManager wsServlet = null;
    private ObjectRegistration<WebSocketManager> websocketService = null;

    public WebSocketManagerProvider() {
        LOG.info("Creating provider for {}", APPLICATION_NAME);
    }

    @Override
    public void init() {
        LOG.info("Init provider for {}", APPLICATION_NAME);
        RpcProviderService rpcProviderRegistry = this.getRpcProviderRegistry();
        if (rpcProviderRegistry != null) {
            if (wsServlet != null) {
                this.websocketService =
                        rpcProviderRegistry.registerRpcImplementation(WebsocketmanagerService.class, wsServlet);
                LOG.info("websocketservice initialized");
            } else {
                LOG.debug("wsServlet not yet provided");
            }
        } else {
            LOG.error("rpcProviderRegistry not provided");
        }
    }

    @Override
    public void close() throws Exception {
        LOG.info("Close provider for {}", APPLICATION_NAME);
        if (websocketService != null) {
            websocketService.close();
        }
    }

    public void onUnbindService(HttpService httpService) {
        httpService.unregister(ALIAS);
        wsServlet = null;
    }

    public void onBindService(HttpService httpService) throws ServletException, NamespaceException {
        if (httpService == null) {
            LOG.warn("Unable to inject HttpService into DluxLoader. dlux modules won't work without httpService");
        } else {

            if (wsServlet == null) {
                wsServlet = new WebSocketManager();
                httpService.registerServlet(ALIAS, wsServlet, null, null);
                LOG.info("websocket servlet registered.");
                if (this.websocketService == null) {
                    this.init();
                } else {
                    LOG.info("websocketservice already initialized");
                }
            } else {
                LOG.warn("Servelt ");
            }
        }

    }

    public WebSocketManager getWsServlet() {
        return wsServlet;
    }

    public void setWsServlet(WebSocketManager wsServlet) {
        this.wsServlet = wsServlet;
    }

    @Override
    public ListenableFuture<RpcResult<WebsocketEventOutput>> websocketEvent(WebsocketEventInput input) {
        if (wsServlet != null) {
			return wsServlet.websocketEvent(input);
		} else {
            RpcResultBuilder<WebsocketEventOutput> result = RpcResultBuilder.failed();
            return result.withError(ErrorType.APPLICATION, "Not intialized").buildFuture();
        }
    }
}