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/*
 * SonarQube
 * Copyright (C) 2009-2018 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.health;

import org.elasticsearch.cluster.health.ClusterHealthStatus;
import org.sonar.api.utils.log.Logger;
import org.sonar.api.utils.log.Loggers;
import org.sonar.server.es.EsClient;

import static org.sonar.server.health.Health.newHealthCheckBuilder;

abstract class EsStatusCheck {
  private static final Logger LOG = Loggers.get(EsStatusCheck.class);

  private static final Health YELLOW_HEALTH = newHealthCheckBuilder()
    .setStatus(Health.Status.YELLOW)
    .addCause("Elasticsearch status is YELLOW")
    .build();
  private static final Health RED_HEALTH = newHealthCheckBuilder()
    .setStatus(Health.Status.RED)
    .addCause("Elasticsearch status is RED")
    .build();
  private static final Health RED_HEALTH_UNAVAILABLE = newHealthCheckBuilder()
    .setStatus(Health.Status.RED)
    .addCause("Elasticsearch status is RED (unavailable)")
    .build();

  private final EsClient esClient;

  EsStatusCheck(EsClient esClient) {
    this.esClient = esClient;
  }

  Health checkEsStatus() {
    try {
      ClusterHealthStatus esStatus = esClient.prepareClusterStats().get().getStatus();
      if (esStatus == null) {
        return RED_HEALTH_UNAVAILABLE;
      }
      switch (esStatus) {
        case GREEN:
          return Health.GREEN;
        case YELLOW:
          return YELLOW_HEALTH;
        case RED:
          return RED_HEALTH;
        default:
          throw new IllegalArgumentException("Unsupported Elasticsearch status " + esStatus);
      }
    } catch (Exception e) {
      LOG.error("Failed to query ES status", e);
      return RED_HEALTH_UNAVAILABLE;
    }
  }
}