/*
    * Copyright 2012-2017 CodeLibs Project and the Others.
    *
    * 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.
   */
  package org.codelibs.fess.job;
  
  import org.codelibs.core.lang.StringUtil;
  import org.codelibs.fess.entity.PingResponse;
  import org.codelibs.fess.es.client.FessEsClient;
  import org.codelibs.fess.helper.SystemHelper;
  import org.codelibs.fess.mylasta.direction.FessConfig;
  import org.codelibs.fess.mylasta.mail.EsStatusPostcard;
  import org.codelibs.fess.util.ComponentUtil;
  import org.lastaflute.core.mail.Postbox;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class PingEsJob {
  
      private static final Logger logger = LoggerFactory.getLogger(PingEsJob.class);
  
      public String execute() {
          final FessEsClient fessEsClient = ComponentUtil.getFessEsClient();
          final FessConfig fessConfig = ComponentUtil.getFessConfig();
          final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
  
          final StringBuilder resultBuf = new StringBuilder();
  
          final String notificationTo = fessConfig.getNotificationTo();
          final PingResponse ping = fessEsClient.ping();
          final int status = ping.getStatus();
          if (systemHelper.isChangedClusterState(status)) {
              if (StringUtil.isNotBlank(notificationTo)) {
                  final Postbox postbox = ComponentUtil.getComponent(Postbox.class);
                  try {
                      EsStatusPostcard.droppedInto(postbox, postcard -> {
                          postcard.setFrom(fessConfig.getMailFromAddress(), fessConfig.getMailFromName());
                          postcard.addReplyTo(fessConfig.getMailReturnPath());
                          postcard.addTo(notificationTo);
                          postcard.setHostname(systemHelper.getHostname());
                          postcard.setClustername(ping.getClusterName());
                          postcard.setClusterstatus(ping.getClusterStatus());
                      });
                  } catch (final Exception e) {
                      logger.warn("Failed to send a test mail.", e);
                  }
              }
              resultBuf.append("Status of ").append(ping.getClusterName()).append(" is changed to ").append(ping.getClusterStatus())
                      .append('.');
          } else {
              if (status == 0) {
                  resultBuf.append(ping.getClusterName()).append(" is alive.");
              } else {
                  resultBuf.append(ping.getClusterName()).append(" is not available.");
              }
          }
  
          return resultBuf.toString();
      }
  
  }