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/*
 * 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.silencedetection.remote;

import org.opencastproject.job.api.Job;
import org.opencastproject.job.api.JobParser;
import org.opencastproject.mediapackage.MediaPackageElementParser;
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.silencedetection.api.SilenceDetectionFailedException;
import org.opencastproject.silencedetection.api.SilenceDetectionService;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Silence dedection service proxy for use as a JVM local service.
 */
@Component(
    immediate = true,
    service = SilenceDetectionService.class,
    property = {
        "service.description=Silence Detection Remote Service Proxy"
    }
)
public class SilenceDetectionServiceRemote extends RemoteBase implements SilenceDetectionService {

  private static final Logger logger = LoggerFactory.getLogger(SilenceDetectionServiceRemote.class);

  public SilenceDetectionServiceRemote() {
    super(JOB_TYPE);
  }

  @Override
  public Job detect(Track sourceTrack) throws SilenceDetectionFailedException {
    return detect(sourceTrack, null);
  }

  @Override
  public Job detect(Track sourceTrack, Track[] referencedTracks) throws SilenceDetectionFailedException {
    HttpPost post = new HttpPost("/detect");
    List params = new ArrayList();
    try {
      params.add(new BasicNameValuePair("track", MediaPackageElementParser.getAsXml(sourceTrack)));
      if (referencedTracks != null && referencedTracks.length > 0) {
        String referencedTracksXml = MediaPackageElementParser.getArrayAsXml(Arrays.asList(referencedTracks));
        params.add(new BasicNameValuePair("referenceTracks", referencedTracksXml));
      }
      post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
    } catch (Exception e) {
      throw new SilenceDetectionFailedException(
              "Unable to assemble a remote silence detection request for track " + sourceTrack.getIdentifier());
    }

    HttpResponse response = null;
    try {
      response = getResponse(post);
      if (response != null) {
        String entity = EntityUtils.toString(response.getEntity());
        if (StringUtils.isNotEmpty(entity)) {
          Job resultJob = JobParser.parseJob(entity);
          logger.info(
                  "Start silence detection for track '{}' on remote silence detection service",
                  sourceTrack.getIdentifier());
          return resultJob;
        }
      }
    } catch (Exception e) {
      throw new SilenceDetectionFailedException("Unable to run silence detection for track "
              + sourceTrack.getIdentifier() + " on remote silence detection service", e);
    } finally {
      closeConnection(response);
    }
    throw new SilenceDetectionFailedException("Unable to run silence detection for track "
            + sourceTrack.getIdentifier() + " on remote silence detection service");
  }

  @Reference
  @Override
  public void setTrustedHttpClient(TrustedHttpClient trustedHttpClient) {
    super.setTrustedHttpClient(trustedHttpClient);
  }

  @Reference
  @Override
  public void setRemoteServiceManager(ServiceRegistry serviceRegistry) {
    super.setRemoteServiceManager(serviceRegistry);
  }

}