/**
 * ============LICENSE_START==========================================
 * org.onap.aai
 * ===================================================================
 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
 * Copyright © 2017-2018 Amdocs
 * ===================================================================
 * 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.aai.modelloader.service;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Base64;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.Timer;
import java.util.TimerTask;

import javax.ws.rs.core.Response;

import org.onap.aai.cl.api.Logger;
import org.onap.aai.cl.eelf.LoggerFactory;
import org.onap.aai.modelloader.config.ModelLoaderConfig;
import org.onap.aai.modelloader.entity.Artifact;
import org.onap.aai.modelloader.notification.ArtifactDeploymentManager;
import org.onap.aai.modelloader.notification.ArtifactDownloadManager;
import org.onap.aai.modelloader.notification.EventCallback;
import org.onap.aai.modelloader.restclient.BabelServiceClientFactory;
import org.openecomp.sdc.api.IDistributionClient;
import org.openecomp.sdc.api.notification.IArtifactInfo;
import org.openecomp.sdc.api.notification.INotificationData;
import org.openecomp.sdc.api.results.IDistributionClientResult;
import org.openecomp.sdc.impl.DistributionClientFactory;
import org.openecomp.sdc.utils.DistributionActionResultEnum;

/**
 * Service class in charge of managing the negotiating model loading capabilities between AAI and an ASDC.
 */
public class ModelLoaderService implements ModelLoaderInterface {

    protected static final String FILESEP =
            (System.getProperty("file.separator") == null) ? "/" : System.getProperty("file.separator");

    protected static final String CONFIG_DIR = System.getProperty("CONFIG_HOME") + FILESEP;
    protected static final String CONFIG_AUTH_LOCATION = CONFIG_DIR + "auth" + FILESEP;
    protected static final String CONFIG_FILE = CONFIG_DIR + "model-loader.properties";

    private IDistributionClient client;
    private ModelLoaderConfig config;

    static Logger logger = LoggerFactory.getInstance().getLogger(ModelLoaderService.class.getName());

    /**
     * Responsible for loading configuration files and calling initialization.
     */
    public ModelLoaderService() {
        start();
    }

    protected void start() {
        // Load model loader system configuration
        logger.info(ModelLoaderMsgs.LOADING_CONFIGURATION);
        Properties configProperties = new Properties();
        try {
            configProperties.load(new FileInputStream(CONFIG_FILE));
        } catch (IOException e) {
            String errorMsg = "Failed to load configuration: " + e.getMessage();
            logger.error(ModelLoaderMsgs.ASDC_CONNECTION_ERROR, errorMsg);
            shutdown();
        }

        config = new ModelLoaderConfig(configProperties, CONFIG_AUTH_LOCATION);
        init();

        Runtime.getRuntime().addShutdownHook(new Thread(this::preShutdownOperations));
    }

    /**
     * Responsible for stopping the connection to the distribution client before the resource is destroyed.
     */
    protected void preShutdownOperations() {
        logger.info(ModelLoaderMsgs.STOPPING_CLIENT);
        if (client != null) {
            client.stop();
        }
    }

    /**
     * Responsible for loading configuration files, initializing model distribution clients, and starting them.
     */
    protected void init() {
        if (!config.getASDCConnectionDisabled()) {
            // Initialize distribution client
            logger.debug(ModelLoaderMsgs.INITIALIZING, "Initializing distribution client...");
            client = DistributionClientFactory.createDistributionClient();
            EventCallback callback = new EventCallback(client, config);

            IDistributionClientResult initResult = client.init(config, callback);

            if (initResult.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
                String errorMsg =
                        "Failed to initialize distribution client: " + initResult.getDistributionMessageResult();
                logger.error(ModelLoaderMsgs.ASDC_CONNECTION_ERROR, errorMsg);

                // Kick off a timer to retry the SDC connection
                Timer timer = new Timer();
                TimerTask task = new SdcConnectionJob(client, config, callback, timer);
                timer.schedule(task, new Date(), 60000);
            } else {
                // Start distribution client
                logger.debug(ModelLoaderMsgs.INITIALIZING, "Starting distribution client...");
                IDistributionClientResult startResult = client.start();
                if (startResult.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
                    String errorMsg =
                            "Failed to start distribution client: " + startResult.getDistributionMessageResult();
                    logger.error(ModelLoaderMsgs.ASDC_CONNECTION_ERROR, errorMsg);

                    // Kick off a timer to retry the SDC connection
                    Timer timer = new Timer();
                    TimerTask task = new SdcConnectionJob(client, config, callback, timer);
                    timer.schedule(task, new Date(), 60000);
                } else {
                    logger.info(ModelLoaderMsgs.INITIALIZING, "Connection to SDC established");
                }
            }
        }
    }

    /**
     * Shut down the process.
     */
    private void shutdown() {
        preShutdownOperations();

        // TODO: Find a better way to shut down the model loader.
        try {
            // Give logs time to write to file
            Thread.sleep(2000);
        } catch (InterruptedException e) { // NOSONAR
            // Nothing we can do at this point
            logger.debug(e.getMessage());
        }

        Runtime.getRuntime().halt(1);
    }

    /**
     * (non-Javadoc)
     *
     * @see org.onap.aai.modelloader.service.ModelLoaderInterface#loadModel(java.lang.String)
     */
    @Override
    public Response loadModel(String modelid) {
        return Response.ok("{\"model_loaded\":\"" + modelid + "\"}").build();
    }

    /**
     * (non-Javadoc)
     *
     * @see org.onap.aai.modelloader.service.ModelLoaderInterface#saveModel(java.lang.String, java.lang.String)
     */
    @Override
    public Response saveModel(String modelid, String modelname) {
        return Response.ok("{\"model_saved\":\"" + modelid + "-" + modelname + "\"}").build();
    }

    @Override
    public Response ingestModel(String modelName, String modelVersion, String payload) throws IOException {
        boolean success;

        if (config.getIngestSimulatorEnabled()) {
            try {
                logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, "Received test artifact");

                List<Artifact> catalogArtifacts = new ArrayList<>();
                List<Artifact> modelArtifacts = new ArrayList<>();

                IArtifactInfo artifactInfo = new ArtifactInfoImpl();
                ((ArtifactInfoImpl) artifactInfo).setArtifactName(modelName);
                ((ArtifactInfoImpl) artifactInfo).setArtifactVersion(modelVersion);

                byte[] csarFile = Base64.getDecoder().decode(payload);

                logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, "Generating xml models from test artifact");

                new ArtifactDownloadManager(client, config, new BabelServiceClientFactory()).processToscaArtifacts(
                        modelArtifacts, catalogArtifacts, csarFile, artifactInfo, "test-transaction-id", modelVersion);

                List<IArtifactInfo> artifacts = new ArrayList<>();
                artifacts.add(artifactInfo);
                INotificationData notificationData = new NotificationDataImpl();
                ((NotificationDataImpl) notificationData).setDistributionID("TestDistributionID");

                logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, "Loading xml models from test artifact");

                success = new ArtifactDeploymentManager(client, config).deploy(notificationData, artifacts,
                        modelArtifacts, catalogArtifacts);

            } catch (Exception e) {
                return Response.serverError().entity(e).build();
            }
        } else {
            logger.debug("Simulation interface disabled");
            success = false;
        }

        Response response;
        if (success) {
            response = Response.ok().build();
        } else {
            response = Response.serverError().build();
        }

        return response;
    }
}