/**
 * 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.sqoop.manager.oracle.util;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.sqoop.SqoopOptions;
import org.apache.sqoop.manager.ConnManager;

/**
 * Helper methods for Oracle testing.
 */
public final class OracleUtils {

  public static final Log LOG = LogFactory.getLog(OracleUtils.class.getName());

  // Express edition hardcoded name.
  public static final String ORACLE_DATABASE_NAME = "xe";

  public static final String CONNECT_STRING = System.getProperty("sqoop.test.oracle.connectstring", "jdbc:oracle:thin:@//localhost/" + ORACLE_DATABASE_NAME);
  public static final String ORACLE_USER_NAME = System.getProperty("sqoop.test.oracle.username", "SQOOPTEST");
  public static final String ORACLE_USER_PASS = System.getProperty("sqoop.test.oracle.password", "12345");

  public static final String ORACLE_SECONDARY_USER_NAME = "SQOOPTEST2";
  public static final String ORACLE_SECONDARY_USER_PASS = "ABCDEF";

  public static final String ORACLE_INVALID_USER_NAME = "invalidusr";
  public static final String SYSTEMTEST_TABLE_NAME = "ORAOOP_TEST";
  public static final int SYSTEMTEST_NUM_ROWS = 100;
  public static final int INTEGRATIONTEST_NUM_ROWS = 10000;
  // Number of mappers if wanting to override default setting
  public static final int NUM_MAPPERS = 0;
  // Oracle degree of parallelism to use when creating table.
  // If 0 we will calculate a recommended value
  public static final int ORACLE_PARALLEL_DEGREE = 0;

  private OracleUtils() { }

  public static void setOracleAuth(SqoopOptions options) {
    options.setUsername(ORACLE_USER_NAME);
    options.setPassword(ORACLE_USER_PASS);
  }

  public static void setOracleSecondaryUserAuth(SqoopOptions options) {
      options.setUsername(ORACLE_SECONDARY_USER_NAME);
      options.setPassword(ORACLE_SECONDARY_USER_PASS);
  }

  /**
   * Drop a table if it exists.
   */
  public static void dropTable(String tableName, ConnManager manager)
      throws SQLException {
    Connection connection = null;
    Statement st = null;

    try {
      connection = manager.getConnection();
      connection.setAutoCommit(false);
      st = connection.createStatement();

      // create the database table and populate it with data.
      st.executeUpdate(getDropTableStatement(tableName));

      connection.commit();
    } finally {
      try {
        if (null != st) {
          st.close();
        }
      } catch (SQLException sqlE) {
        LOG.warn("Got SQLException when closing connection: " + sqlE);
      }
    }
  }

  public static String getDropTableStatement(String tableName) {
    return "BEGIN EXECUTE IMMEDIATE 'DROP TABLE " + tableName + "'; "
        + "exception when others then null; end;";
  }
}