/**
    * 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 storm.starter.tools;
  
  import backtype.storm.utils.Time;
  import org.testng.annotations.DataProvider;
  import org.testng.annotations.Test;
  
  import static org.fest.assertions.api.Assertions.assertThat;
  
  public class NthLastModifiedTimeTrackerTest {
  
    private static final int ANY_NUM_TIMES_TO_TRACK = 3;
    private static final int MILLIS_IN_SEC = 1000;
  
    @DataProvider
    public Object[][] illegalNumTimesData() {
      return new Object[][]{ { -10 }, { -3 }, { -2 }, { -1 }, { 0 } };
    }
  
    @Test(expectedExceptions = IllegalArgumentException.class, dataProvider = "illegalNumTimesData")
    public void negativeOrZeroNumTimesToTrackShouldThrowIAE(int numTimesToTrack) {
      new NthLastModifiedTimeTracker(numTimesToTrack);
    }
  
    @DataProvider
    public Object[][] legalNumTimesData() {
      return new Object[][]{ { 1 }, { 2 }, { 3 }, { 20 } };
    }
  
    @Test(dataProvider = "legalNumTimesData")
    public void positiveNumTimesToTrackShouldBeOk(int numTimesToTrack) {
      new NthLastModifiedTimeTracker(numTimesToTrack);
    }
  
    @DataProvider
    public Object[][] whenNotYetMarkedAsModifiedData() {
      return new Object[][]{ { 0 }, { 1 }, { 2 }, { 3 }, { 4 }, { 5 }, { 8 }, { 10 } };
    }
  
    @Test(dataProvider = "whenNotYetMarkedAsModifiedData")
    public void shouldReturnCorrectModifiedTimeEvenWhenNotYetMarkedAsModified(int secondsToAdvance) {
      // given
      Time.startSimulating();
      NthLastModifiedTimeTracker tracker = new NthLastModifiedTimeTracker(ANY_NUM_TIMES_TO_TRACK);
  
      // when
      advanceSimulatedTimeBy(secondsToAdvance);
      int seconds = tracker.secondsSinceOldestModification();
  
      // then
      assertThat(seconds).isEqualTo(secondsToAdvance);
  
      // cleanup
      Time.stopSimulating();
    }
  
    @DataProvider
    public Object[][] simulatedTrackerIterations() {
      return new Object[][]{ { 1, new int[]{ 0, 1 }, new int[]{ 0, 0 } }, { 1, new int[]{ 0, 2 }, new int[]{ 0, 0 } },
          { 2, new int[]{ 2, 2 }, new int[]{ 2, 2 } }, { 2, new int[]{ 0, 4 }, new int[]{ 0, 4 } },
          { 1, new int[]{ 1, 1, 1, 1, 1, 1, 1 }, new int[]{ 0, 0, 0, 0, 0, 0, 0 } },
          { 1, new int[]{ 1, 2, 3, 4, 5, 6, 7 }, new int[]{ 0, 0, 0, 0, 0, 0, 0 } },
          { 2, new int[]{ 1, 1, 1, 1, 1, 1, 1 }, new int[]{ 1, 1, 1, 1, 1, 1, 1 } },
          { 2, new int[]{ 2, 2, 2, 2, 2, 2, 2 }, new int[]{ 2, 2, 2, 2, 2, 2, 2 } },
          { 2, new int[]{ 1, 2, 3, 4, 5, 6, 7 }, new int[]{ 1, 2, 3, 4, 5, 6, 7 } },
          { 3, new int[]{ 1, 1, 1, 1, 1, 1, 1 }, new int[]{ 1, 2, 2, 2, 2, 2, 2 } },
          { 3, new int[]{ 1, 2, 3, 4, 5, 6, 7 }, new int[]{ 1, 3, 5, 7, 9, 11, 13 } },
          { 3, new int[]{ 2, 2, 2, 2, 2, 2, 2 }, new int[]{ 2, 4, 4, 4, 4, 4, 4 } },
          { 4, new int[]{ 1, 1, 1, 1, 1, 1, 1 }, new int[]{ 1, 2, 3, 3, 3, 3, 3 } },
          { 4, new int[]{ 1, 2, 3, 4, 5, 6, 7 }, new int[]{ 1, 3, 6, 9, 12, 15, 18 } },
          { 4, new int[]{ 2, 2, 2, 2, 2, 2, 2 }, new int[]{ 2, 4, 6, 6, 6, 6, 6 } },
          { 5, new int[]{ 1, 1, 1, 1, 1, 1, 1 }, new int[]{ 1, 2, 3, 4, 4, 4, 4 } },
          { 5, new int[]{ 1, 2, 3, 4, 5, 6, 7 }, new int[]{ 1, 3, 6, 10, 14, 18, 22 } },
          { 5, new int[]{ 2, 2, 2, 2, 2, 2, 2 }, new int[]{ 2, 4, 6, 8, 8, 8, 8 } },
          { 6, new int[]{ 1, 1, 1, 1, 1, 1, 1 }, new int[]{ 1, 2, 3, 4, 5, 5, 5 } },
          { 6, new int[]{ 1, 2, 3, 4, 5, 6, 7 }, new int[]{ 1, 3, 6, 10, 15, 20, 25 } },
          { 6, new int[]{ 2, 2, 2, 2, 2, 2, 2 }, new int[]{ 2, 4, 6, 8, 10, 10, 10 } },
          { 3, new int[]{ 1, 2, 3 }, new int[]{ 1, 3, 5 } } };
    }
  
    @Test(dataProvider = "simulatedTrackerIterations")
    public void shouldReturnCorrectModifiedTimeWhenMarkedAsModified(int numTimesToTrack,
        int[] secondsToAdvancePerIteration, int[] expLastModifiedTimes) {
     // given
     Time.startSimulating();
     NthLastModifiedTimeTracker tracker = new NthLastModifiedTimeTracker(numTimesToTrack);
 
     int[] modifiedTimes = new int[expLastModifiedTimes.length];
 
     // when
     int i = 0;
     for (int secondsToAdvance : secondsToAdvancePerIteration) {
       advanceSimulatedTimeBy(secondsToAdvance);
       tracker.markAsModified();
       modifiedTimes[i] = tracker.secondsSinceOldestModification();
       i++;
     }
 
     // then
     assertThat(modifiedTimes).isEqualTo(expLastModifiedTimes);
 
     // cleanup
     Time.stopSimulating();
   }
 
   private void advanceSimulatedTimeBy(int seconds) {
     Time.advanceTime(seconds * MILLIS_IN_SEC);
   }
 }