/*
 * 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.carbondata.core.stats;

import java.io.Serializable;

import org.apache.commons.lang3.StringUtils;

/**
 * Wrapper class to maintain the query statistics for each phase of the query
 */
public class QueryStatistic implements Serializable {

  /**
   * serialization id
   */
  private static final long serialVersionUID = -5667106646135905848L;

  /**
   * statistic message
   */
  private String message;

  /**
   * total time take of the phase
   */
  private long timeTaken;

  /**
   * start time of the phase
   */
  private long startTime;

  /**
   * number of count
   */
  private long count;

  public QueryStatistic() {
    this.startTime = System.currentTimeMillis();
  }

  /**
   * below method will be used to add the statistic
   *
   * @param message     Statistic message
   * @param currentTime current time
   */
  public void addStatistics(String message, long currentTime) {
    this.timeTaken = currentTime - startTime;
    this.message = message;
  }

  /**
   * Below method will be used to add fixed time statistic.
   * For example total time taken for scan or result preparation
   *
   * @param message   statistic message
   * @param timeTaken
   */
  public void addFixedTimeStatistic(String message, long timeTaken) {
    this.timeTaken = timeTaken;
    this.message = message;
  }

  public void addCountStatistic(String message, long count) {
    this.timeTaken = -1;
    this.count = count;
    this.message = message;
  }

  /**
   * Below method will be used to get the statistic message, which will
   * be used to log
   *
   * @param queryWithTaskId query with task id to append in the message
   * @return statistic message
   */
  public String getStatistics(String queryWithTaskId) {
    if (StringUtils.isEmpty(queryWithTaskId)) {
      return message + timeTaken;
    }
    return message + " for the task id : " + queryWithTaskId + " Is : " + timeTaken;
  }

  public String getMessage() {
    return this.message;
  }

  public long getTimeTaken() {
    return  this.timeTaken;
  }

  public long getCount() {
    return this.count;
  }

  public long getStartTime() {
    return this.startTime;
  }

}