/*
 *
 * MariaDB Client for Java
 *
 * Copyright (c) 2012-2014 Monty Program Ab.
 * Copyright (c) 2015-2020 MariaDB Corporation Ab.
 *
 * This library 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 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 library; if not, write to Monty Program Ab info@montyprogram.com.
 *
 * This particular MariaDB Client for Java file is work
 * derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
 * the following copyright and notice provisions:
 *
 * Copyright (c) 2009-2011, Marcus Eriksson
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * Neither the name of the driver nor the names of its contributors may not be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS  AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 */

package org.mariadb.jdbc.internal.com.read.dao;

import java.sql.ResultSet;
import org.mariadb.jdbc.internal.com.read.resultset.SelectResultSet;
import org.mariadb.jdbc.internal.protocol.Protocol;

public class CmdInformationSingle implements CmdInformation {

  private final long insertId;
  private final int autoIncrement;
  private long updateCount;

  /**
   * Object containing update / insert ids, optimized for only one result.
   *
   * @param insertId auto generated id.
   * @param updateCount update count
   * @param autoIncrement connection auto increment value.
   */
  public CmdInformationSingle(long insertId, long updateCount, int autoIncrement) {
    this.insertId = insertId;
    this.updateCount = updateCount;
    this.autoIncrement = autoIncrement;
  }

  @Override
  public int[] getUpdateCounts() {
    return new int[] {(int) updateCount};
  }

  @Override
  public int[] getServerUpdateCounts() {
    return new int[] {(int) updateCount};
  }

  @Override
  public long[] getLargeUpdateCounts() {
    return new long[] {updateCount};
  }

  @Override
  public int getUpdateCount() {
    return (int) updateCount;
  }

  @Override
  public long getLargeUpdateCount() {
    return updateCount;
  }

  @Override
  public void addErrorStat() {
    // not expected
  }

  @Override
  public void reset() {
    // not expected
  }

  @Override
  public void addResultSetStat() {
    // not expected
  }

  /**
   * Get generated Keys.
   *
   * @param protocol current protocol
   * @param sql SQL command
   * @return a resultSet containing the single insert ids.
   */
  public ResultSet getGeneratedKeys(Protocol protocol, String sql) {
    if (insertId == 0) {
      return SelectResultSet.createEmptyResultSet();
    }
    if (updateCount > 1 && sql != null && !isDuplicateKeyUpdate(sql)) {
      long[] insertIds = new long[(int) updateCount];
      for (int i = 0; i < updateCount; i++) {
        insertIds[i] = insertId + i * autoIncrement;
      }
      return SelectResultSet.createGeneratedData(insertIds, protocol, true);
    }
    return SelectResultSet.createGeneratedData(new long[] {insertId}, protocol, true);
  }

  private boolean isDuplicateKeyUpdate(String sql) {
    return sql.matches("(?i).*ON\\s+DUPLICATE\\s+KEY\\s+UPDATE.*");
  }

  @Override
  public ResultSet getBatchGeneratedKeys(Protocol protocol) {
    return getGeneratedKeys(protocol, null);
  }

  public int getCurrentStatNumber() {
    return 1;
  }

  @Override
  public boolean moreResults() {
    updateCount = RESULT_SET_VALUE;
    return false;
  }

  public boolean isCurrentUpdateCount() {
    return updateCount != RESULT_SET_VALUE;
  }

  @Override
  public void addSuccessStat(long updateCount, long insertId) {
    // cannot occur
  }

  public void setRewrite(boolean rewritten) {
    // no need
  }
}
