/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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.
   *
   */
  
  package org.opencastproject.composer.remote;
  
  import org.opencastproject.composer.api.ComposerService;
  import org.opencastproject.composer.api.EncoderException;
  import org.opencastproject.composer.api.EncodingProfile;
  import org.opencastproject.composer.api.EncodingProfileBuilder;
  import org.opencastproject.composer.api.EncodingProfileImpl;
  import org.opencastproject.composer.api.EncodingProfileList;
  import org.opencastproject.composer.api.LaidOutElement;
  import org.opencastproject.composer.layout.Dimension;
  import org.opencastproject.composer.layout.Serializer;
  import org.opencastproject.job.api.Job;
  import org.opencastproject.job.api.JobParser;
  import org.opencastproject.mediapackage.Attachment;
  import org.opencastproject.mediapackage.MediaPackageElementParser;
  import org.opencastproject.mediapackage.MediaPackageException;
  import org.opencastproject.mediapackage.Track;
  import org.opencastproject.security.api.TrustedHttpClient;
  import org.opencastproject.serviceregistry.api.RemoteBase;
  import org.opencastproject.serviceregistry.api.ServiceRegistry;
  import org.opencastproject.smil.entity.api.Smil;
  import org.opencastproject.util.data.Option;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.http.HttpResponse;
  import org.apache.http.HttpStatus;
  import org.apache.http.client.entity.UrlEncodedFormEntity;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.message.BasicNameValuePair;
  import org.apache.http.util.EntityUtils;
  import org.osgi.service.component.annotations.Component;
  import org.osgi.service.component.annotations.Reference;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.nio.charset.Charset;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.stream.Collectors;
  
  /**
   * Proxies a set of remote composer services for use as a JVM-local service. Remote services are selected at random.
   */
  @Component(
    property = {
      "service.description=Composer (Encoder) Remote Service Proxy"
    },
    immediate = true,
    service = { ComposerService.class }
  )
  public class ComposerServiceRemoteImpl extends RemoteBase implements ComposerService {
  
    /** The logger */
    private static final Logger logger = LoggerFactory.getLogger(ComposerServiceRemoteImpl.class);
  
    public ComposerServiceRemoteImpl() {
      super(JOB_TYPE);
    }
  
    /**
     * Sets the trusted http client
     *
     * @param client
     */
    @Override
    @Reference
    public void setTrustedHttpClient(TrustedHttpClient client) {
      this.client = client;
    }
  
    /**
    * Sets the remote service manager.
    *
    * @param remoteServiceManager
    */
   @Override
   @Reference
   public void setRemoteServiceManager(ServiceRegistry remoteServiceManager) {
     this.remoteServiceManager = remoteServiceManager;
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#encode(org.opencastproject.mediapackage.Track,
    *      java.lang.String)
    */
   @Override
   public Job encode(Track sourceTrack, String profileId) throws EncoderException {
     HttpPost post = new HttpPost("/encode");
     try {
       List<BasicNameValuePair> params = new ArrayList<>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException("Unable to assemble a remote composer request for track " + sourceTrack, e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         String content = EntityUtils.toString(response.getEntity());
         Job r = JobParser.parseJob(content);
         logger.info("Encoding job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException("Unable to encode track " + sourceTrack + " using a remote composer service", e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to encode track " + sourceTrack + " using a remote composer service");
   }
 
   /**
    * {@inheritDoc}
    */
   @Override
   public Job parallelEncode(Track sourceTrack, String profileId) throws EncoderException {
     HttpPost post = new HttpPost("/parallelencode");
     try {
       List<BasicNameValuePair> params = new ArrayList<>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException("Unable to assemble a remote composer request for track " + sourceTrack, e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         String content = EntityUtils.toString(response.getEntity());
         Job r = JobParser.parseJob(content);
         logger.info("Encoding job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException("Unable to encode track " + sourceTrack + " using a remote composer service", e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to encode track " + sourceTrack + " using a remote composer service");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#trim(Track, String, long, long)
    */
   @Override
   public Job trim(Track sourceTrack, String profileId, long start, long duration) throws EncoderException {
     HttpPost post = new HttpPost("/trim");
     try {
       List<BasicNameValuePair> params = new ArrayList<>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       params.add(new BasicNameValuePair("start", Long.toString(start)));
       params.add(new BasicNameValuePair("duration", Long.toString(duration)));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException("Unable to assemble a remote composer request for track " + sourceTrack, e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         String content = EntityUtils.toString(response.getEntity());
         Job r = JobParser.parseJob(content);
         logger.info("Trimming job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException("Unable to trim track " + sourceTrack + " using a remote composer service", e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to trim track " + sourceTrack + " using a remote composer service");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#mux(org.opencastproject.mediapackage.Track,
    *      org.opencastproject.mediapackage.Track, java.lang.String)
    */
   @Override
   public Job mux(Track sourceVideoTrack, Track sourceAudioTrack, String profileId) throws EncoderException {
     HttpPost post = new HttpPost("/mux");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("videoSourceTrack", MediaPackageElementParser.getAsXml(sourceVideoTrack)));
       params.add(new BasicNameValuePair("audioSourceTrack", MediaPackageElementParser.getAsXml(sourceAudioTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException("Unable to assemble a remote composer request", e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         String content = EntityUtils.toString(response.getEntity());
         Job r = JobParser.parseJob(content);
         logger.info("Muxing job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (IOException e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to mux tracks " + sourceVideoTrack + " and " + sourceAudioTrack
             + " using a remote composer");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#getProfile(java.lang.String)
    */
   @Override
   public EncodingProfile getProfile(String profileId) {
     HttpGet get = new HttpGet("/profile/" + profileId + ".xml");
     HttpResponse response = null;
     try {
       response = getResponse(get, HttpStatus.SC_OK, HttpStatus.SC_NOT_FOUND);
       if (response != null && response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
         return EncodingProfileBuilder.getInstance().parseProfile(response.getEntity().getContent());
       } else {
         return null;
       }
     } catch (Exception e) {
       throw new RuntimeException(e);
     } finally {
       closeConnection(response);
     }
   }
 
   /**
    * {@inheritDoc}
    */
   @Override
   public Job image(Track sourceTrack, String profileId, double... times) throws EncoderException {
     HttpPost post = new HttpPost("/image");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       params.add(new BasicNameValuePair("time", buildTimeArray(times)));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Image extraction job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to compose an image from track " + sourceTrack
             + " using the remote composer service proxy");
   }
 
   @Override
   public List<Attachment> imageSync(Track sourceTrack, String profileId, double... times) throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/imagesync");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       params.add(new BasicNameValuePair("time", buildTimeArray(times)));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         final String xml = IOUtils.toString(response.getEntity().getContent(), Charset.forName("utf-8"));
         return MediaPackageElementParser.getArrayFromXml(xml)
             .stream().map(e -> (Attachment)e)
             .collect(Collectors.toList());
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to compose an image from track " + sourceTrack
         + " using the remote composer service proxy");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#image(Track, String, Map)
    */
   @Override
   public Job image(Track sourceTrack, String profileId, Map<String, String> properties) throws EncoderException,
           MediaPackageException {
     HttpPost post = new HttpPost("/image");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       if (properties != null)
         params.add(new BasicNameValuePair("properties", mapToString(properties)));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Image extraction job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to compose an image from track " + sourceTrack
             + " using the remote composer service proxy");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#convertImage(org.opencastproject.mediapackage.Attachment,
    *      java.lang.String...)
    */
   @Override
   public Job convertImage(Attachment image, String... profileIds) throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/convertimage");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceImage", MediaPackageElementParser.getAsXml(image)));
       params.add(new BasicNameValuePair("profileId", StringUtils.join(profileIds, ',')));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Image conversion job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to convert image at " + image + " using the remote composer service proxy");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#convertImageSync(
    *      org.opencastproject.mediapackage.Attachment, java.lang.String...)
    */
   @Override
   public List<Attachment> convertImageSync(Attachment image, String... profileIds) throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/convertimagesync");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceImage", MediaPackageElementParser.getAsXml(image)));
       params.add(new BasicNameValuePair("profileIds", StringUtils.join(profileIds, ',')));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         final String xml = IOUtils.toString(response.getEntity().getContent(), Charset.forName("utf-8"));
         return MediaPackageElementParser.getArrayFromXml(xml).stream().map(a -> (Attachment) a).collect(Collectors.toList());
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to convert image at " + image + " using the remote composer service proxy");
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.composer.api.ComposerService#listProfiles()
    */
   @Override
   public EncodingProfile[] listProfiles() {
     HttpGet get = new HttpGet("/profiles.xml");
     HttpResponse response = null;
     try {
       response = getResponse(get);
       if (response != null) {
         EncodingProfileList profileList = EncodingProfileBuilder.getInstance().parseProfileList(
                 response.getEntity().getContent());
         List<EncodingProfileImpl> list = profileList.getProfiles();
         return list.toArray(new EncodingProfile[list.size()]);
       }
     } catch (Exception e) {
       throw new RuntimeException(
               "Unable to list the encoding profiles registered with the remote composer service proxy", e);
     } finally {
       closeConnection(response);
     }
     throw new RuntimeException("Unable to list the encoding profiles registered with the remote composer service proxy");
   }
 
   /**
    * Builds string containing times in seconds separated by comma.
    *
    * @param times
    *          time array to be converted to string
    * @return string represented specified time array
    */
   protected String buildTimeArray(double[] times) {
     if (times.length == 0)
       return "";
 
     StringBuilder builder = new StringBuilder();
     builder.append(Double.toString(times[0]));
     for (int i = 1; i < times.length; i++) {
       builder.append(";" + Double.toString(times[i]));
     }
     return builder.toString();
   }
 
   @Override
   public Job composite(Dimension compositeTrackSize, Option<LaidOutElement<Track>> upperTrack,
           LaidOutElement<Track> lowerTrack, Option<LaidOutElement<Attachment>> watermark, String profileId,
           String background, String sourceAudioName) throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/composite");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("compositeSize", Serializer.json(compositeTrackSize).toJson()));
       params.add(new BasicNameValuePair("lowerTrack", MediaPackageElementParser.getAsXml(lowerTrack.getElement())));
       params.add(new BasicNameValuePair("lowerLayout", Serializer.json(lowerTrack.getLayout()).toJson()));
       if (upperTrack.isSome()) {
         params.add(new BasicNameValuePair("upperTrack", MediaPackageElementParser.getAsXml(upperTrack.get()
                 .getElement())));
         params.add(new BasicNameValuePair("upperLayout", Serializer.json(upperTrack.get().getLayout()).toJson()));
       }
 
       if (watermark.isSome()) {
         params.add(new BasicNameValuePair("watermarkAttachment", MediaPackageElementParser.getAsXml(watermark.get()
                 .getElement())));
         params.add(new BasicNameValuePair("watermarkLayout", Serializer.json(watermark.get().getLayout()).toJson()));
       }
       params.add(new BasicNameValuePair("profileId", profileId));
       params.add(new BasicNameValuePair("background", background));
       params.add(new BasicNameValuePair("sourceAudioName", sourceAudioName));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Composite video job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     if (upperTrack.isSome()) {
       throw new EncoderException("Unable to composite video from track " + lowerTrack.getElement() + " and "
               + upperTrack.get().getElement() + " using the remote composer service proxy");
     } else {
       throw new EncoderException("Unable to composite video from track " + lowerTrack.getElement()
               + " using the remote composer service proxy");
     }
   }
 
   @Override
   public Job concat(String profileId, Dimension outputDimension, boolean sameCodec, Track... tracks)
           throws EncoderException, MediaPackageException {
     return concat(profileId, outputDimension, -1.0f, sameCodec, tracks);
   }
 
   @Override
   public Job concat(String profileId, Dimension outputDimension, float outputFrameRate, boolean sameCodec,
           Track... tracks)
           throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/concat");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("profileId", profileId));
       if (outputDimension != null)
         params.add(new BasicNameValuePair("outputDimension", Serializer.json(outputDimension).toJson()));
       params.add(new BasicNameValuePair("outputFrameRate", String.format(Locale.US, "%f", outputFrameRate)));
       params.add(new BasicNameValuePair("sourceTracks", MediaPackageElementParser.getArrayAsXml(Arrays.asList(tracks))));
       if (sameCodec)
         params.add(new BasicNameValuePair("sameCodec", "true"));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Concat video job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to concat videos from tracks " + tracks
             + " using the remote composer service proxy");
   }
 
   @Override
   public Job imageToVideo(Attachment sourceImageAttachment, String profileId, double time) throws EncoderException,
           MediaPackageException {
     HttpPost post = new HttpPost("/imagetovideo");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceAttachment", MediaPackageElementParser.getAsXml(sourceImageAttachment)));
       params.add(new BasicNameValuePair("profileId", profileId));
       params.add(new BasicNameValuePair("time", Double.toString(time)));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Image to video converting job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to convert an image to a video from attachment " + sourceImageAttachment
             + " using the remote composer service proxy");
   }
 
   @Override
   public Job demux(Track sourceTrack, String profileId) throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/demux");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileId", profileId));
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException("Unable to assemble a remote demux request for track " + sourceTrack, e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         String content = EntityUtils.toString(response.getEntity());
         Job r = JobParser.parseJob(content);
         logger.info("Demuxing job {} started on a remote service ", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException("Unable to demux track " + sourceTrack + " using a remote composer service", e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to demux track " + sourceTrack + " using a remote composer service");
   }
 
   @Override
   public Job processSmil(Smil smil, String trackParamGroupId, String mediaType, List<String> profileIds)
           throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/processsmil");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("smilAsXml", smil.toXML()));
       params.add(new BasicNameValuePair("trackId", trackParamGroupId));
       params.add(new BasicNameValuePair("mediaType", mediaType));
       params.add(new BasicNameValuePair("profileIds", StringUtils.join(profileIds, ","))); // comma separated profiles
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException(e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         Job r = JobParser.parseJob(response.getEntity().getContent());
         logger.info("Concat video job {} started on a remote composer", r.getId());
         return r;
       }
     } catch (Exception e) {
       throw new EncoderException(e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to edit video group(" + trackParamGroupId + ") from smil " + smil
             + " using the remote composer service proxy");
   }
 
   @Override
   public Job multiEncode(Track sourceTrack, List<String> profileIds) throws EncoderException, MediaPackageException {
     HttpPost post = new HttpPost("/multiencode");
     try {
       List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
       params.add(new BasicNameValuePair("sourceTrack", MediaPackageElementParser.getAsXml(sourceTrack)));
       params.add(new BasicNameValuePair("profileIds", StringUtils.join(profileIds, ","))); // comma separated profiles
       post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
     } catch (Exception e) {
       throw new EncoderException("Unable to assemble a remote demux request for track " + sourceTrack, e);
     }
     HttpResponse response = null;
     try {
       response = getResponse(post);
       if (response != null) {
         String content = EntityUtils.toString(response.getEntity());
         Job job = JobParser.parseJob(content);
         logger.info("Encoding job {} started on a remote multiencode", job.getId());
         return job;
       }
     } catch (Exception e) {
       throw new EncoderException("Unable to multiencode track " + sourceTrack + " using a remote composer service", e);
     } finally {
       closeConnection(response);
     }
     throw new EncoderException("Unable to multiencode track " + sourceTrack + " using a remote composer service");
   }
 
   /**
    * Converts a Map<String, String> to s key=value\n string, suitable for the properties form parameter expected by the
    * workflow rest endpoint.
    *
    * @param props
    *          The map of strings
    * @return the string representation
    */
   private String mapToString(Map<String, String> props) {
     StringBuilder sb = new StringBuilder();
     for (Entry<String, String> entry : props.entrySet()) {
       sb.append(entry.getKey());
       sb.append("=");
       sb.append(entry.getValue());
       sb.append("\n");
     }
     return sb.toString();
   }
 
 }