/*
 * 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.phoenix.pherf.workload;

import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.Callable;
import org.apache.phoenix.pherf.PherfConstants;
import org.apache.phoenix.pherf.configuration.Query;
import org.apache.phoenix.pherf.result.RunTime;
import org.apache.phoenix.pherf.result.ThreadTime;
import org.apache.phoenix.pherf.util.PhoenixUtil;
import org.apache.phoenix.util.EnvironmentEdgeManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class MultithreadedDiffer implements Callable<Void> {
  private static final Logger LOGGER = LoggerFactory.getLogger(MultithreadedDiffer.class);
  private Thread t;
  private Query query;
  private ThreadTime threadTime;
  private long numberOfExecutions;
  private long executionDurationInMs;
  private QueryVerifier queryVerifier = new QueryVerifier(true);
  private static PhoenixUtil pUtil = PhoenixUtil.create();

  private synchronized ThreadTime getThreadTime() {
    return threadTime;
  }

  /**
   * Query Verification
   */
  private void diffQuery() throws Exception {
    Long start = EnvironmentEdgeManager.currentTimeMillis();
    Date startDate = Calendar.getInstance().getTime();
    String newCSV = queryVerifier.exportCSV(query);
    boolean verifyResult = queryVerifier.doDiff(query, newCSV);
    String explainPlan = pUtil.getExplainPlan(query);
    long elapsedTime = EnvironmentEdgeManager.currentTimeMillis() - start;
    getThreadTime().getRunTimesInMs()
      .add(new RunTime(verifyResult == true ? PherfConstants.DIFF_PASS : PherfConstants.DIFF_FAIL,
        explainPlan, startDate, -1L, elapsedTime, !(elapsedTime >= executionDurationInMs)));
  }

  /**
   * Multithreaded Differ
   */
  MultithreadedDiffer(String threadName, Query query, ThreadTime threadTime,
    long numberOfExecutions, long executionDurationInMs) {
    this.query = query;
    this.threadTime = threadTime;
    this.numberOfExecutions = numberOfExecutions;
    this.executionDurationInMs = executionDurationInMs;
  }

  /**
   * Executes verification runs for a minimum of number of execution or execution duration
   */
  public Void call() throws Exception {
    LOGGER.info("\n\nThread Starting " + t.getName() + " ; " + query.getStatement() + " for "
      + numberOfExecutions + "times\n\n");
    Long start = EnvironmentEdgeManager.currentTimeMillis();
    for (long i = numberOfExecutions; (i > 0
      && ((EnvironmentEdgeManager.currentTimeMillis() - start) < executionDurationInMs)); i--) {
      try {
        diffQuery();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    LOGGER.info("\n\nThread exiting." + t.getName() + "\n\n");
    return null;
  }
}
