/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.syncope.core.provisioning.java.job;
  
  import javax.sql.DataSource;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.InitializingBean;
  import org.springframework.jdbc.BadSqlGrammarException;
  import org.springframework.jdbc.core.JdbcTemplate;
  import org.springframework.jdbc.datasource.init.DatabasePopulator;
  import org.springframework.jdbc.datasource.init.DatabasePopulatorUtils;
  import org.springframework.util.Assert;
  
  /**
   * Ensure Quartz database initialization occurs only if Quartz tables are not already present.
   *
   * @see org.springframework.jdbc.datasource.init.DataSourceInitializer
   */
  public class SchedulerDBInit implements InitializingBean {
  
      private static final Logger LOG = LoggerFactory.getLogger(SchedulerDBInit.class);
  
      private DataSource dataSource;
  
      private DatabasePopulator databasePopulator;
  
      public void setDataSource(final DataSource dataSource) {
          this.dataSource = dataSource;
      }
  
      public void setDatabasePopulator(final DatabasePopulator databasePopulator) {
          this.databasePopulator = databasePopulator;
      }
  
      @Override
      public void afterPropertiesSet() throws Exception {
          Assert.state(this.dataSource != null, "DataSource must be set");
          Assert.state(this.databasePopulator != null, "DatabasePopulator must be set");
  
          JdbcTemplate jdbcTemplate = new JdbcTemplate(this.dataSource);
          boolean existingData;
          try {
              existingData = jdbcTemplate.queryForObject("SELECT COUNT(0) FROM QRTZ_SCHEDULER_STATE", Integer.class) >= 0;
          } catch (BadSqlGrammarException e) {
              LOG.debug("Could not access to table QRTZ_SCHEDULER_STATE", e);
              existingData = false;
          }
  
          if (existingData) {
              LOG.info("Quartz tables found in the database, leaving untouched");
          } else {
              LOG.info("No Quartz tables found, creating");
  
              DatabasePopulatorUtils.execute(databasePopulator, this.dataSource);
          }
      }
  }