/*
    * 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.external.util;
  
  import static org.opencastproject.index.service.util.JSONUtils.safeString;
  import static org.opencastproject.util.DateTimeSupport.toUTC;
  
  import org.opencastproject.capture.CaptureParameters;
  import org.opencastproject.capture.admin.api.Agent;
  
  import com.google.gson.JsonArray;
  import com.google.gson.JsonObject;
  import com.google.gson.JsonPrimitive;
  
  public final class CaptureAgentUtils {
  
    private static final String JSON_KEY_AGENT_ID = "agent_id";
    private static final String JSON_KEY_STATUS = "status";
    private static final String JSON_KEY_URL = "url";
    private static final String JSON_KEY_INPUTS = "inputs";
    private static final String JSON_KEY_UPDATE = "update";
  
  
    private CaptureAgentUtils() {
    }
  
    /**
     * Generate a JSON Object for the given capture agent
     *
     * @param agent
     *          The capture agent
     * @return A {@link JsonObject} representing the capture agent
     */
    public static JsonObject generateJsonAgent(Agent agent) {
      JsonObject json = new JsonObject();
      String devices = (String) agent.getCapabilities().get(CaptureParameters.CAPTURE_DEVICE_NAMES);
      json.addProperty(JSON_KEY_STATUS, safeString(agent.getState()));
      json.addProperty(JSON_KEY_AGENT_ID, agent.getName());
      json.addProperty(JSON_KEY_UPDATE, safeString(toUTC(agent.getLastHeardFrom())));
      json.addProperty(JSON_KEY_URL, safeString(agent.getUrl()));
      JsonArray inputs = new JsonArray();
      if (devices != null && !devices.trim().isEmpty()) {
        for (String device : devices.split(",")) {
          inputs.add(new JsonPrimitive(device.trim()));
        }
      }
      json.add("inputs", inputs);
      return json;
    }
  }