/*
 * 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.geode.cache.lucene.internal;

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.*;

import java.util.function.IntSupplier;

import org.apache.geode.Statistics;
import org.apache.geode.StatisticsFactory;
import org.apache.geode.StatisticsType;
import org.apache.geode.test.junit.categories.UnitTest;

import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.mockito.ArgumentCaptor;

@Category(UnitTest.class)
public class LuceneIndexStatsJUnitTest {

  private Statistics statistics;
  private LuceneIndexStats stats;
  private StatisticsType type;

  @Before
  public void createStats() {
    StatisticsFactory statsFactory = mock(StatisticsFactory.class);
    statistics = mock(Statistics.class);
    when(statsFactory.createAtomicStatistics(any(), anyString())).thenReturn(statistics);
    stats = new LuceneIndexStats(statsFactory, "region-index");


    ArgumentCaptor<StatisticsType> statsTypeCaptor = ArgumentCaptor.forClass(StatisticsType.class);
    verify(statsFactory).createAtomicStatistics(statsTypeCaptor.capture(), anyString());
    type = statsTypeCaptor.getValue();
  }

  @Test
  public void shouldIncrementQueryStats() {

    stats.startQuery();
    verifyIncInt("queryExecutionsInProgress", 1);
    stats.endQuery(5, 2);
    stats.incNumberOfQueryExecuted();
    verifyIncInt("queryExecutionsInProgress", -1);
    verifyIncInt("queryExecutions", 1);
    verifyIncLong("queryExecutionTotalHits", 2);
    // Because the initial stat time is 0 and the final time is 5, the delta is -5
    verifyIncLong("queryExecutionTime", -5);
  }

  @Test
  public void shouldIncrementRepositoryQueryStats() {

    stats.startRepositoryQuery();
    verifyIncInt("repositoryQueryExecutionsInProgress", 1);
    stats.endRepositoryQuery(5, 2);
    verifyIncInt("repositoryQueryExecutionsInProgress", -1);
    verifyIncInt("repositoryQueryExecutions", 1);
    verifyIncLong("repositoryQueryExecutionTotalHits", 2);
    // Because the initial stat time is 0 and the final time is 5, the delta is -5
    verifyIncLong("repositoryQueryExecutionTime", -5);
  }

  @Test
  public void shouldIncrementUpdateStats() {

    stats.startUpdate();
    verifyIncInt("updatesInProgress", 1);
    stats.endUpdate(5);
    verifyIncInt("updatesInProgress", -1);
    verifyIncInt("updates", 1);
    // Because the initial stat time is 0 and the final time is 5, the delta is -5
    verifyIncLong("updateTime", -5);
  }

  @Test
  public void shouldIncrementCommitStats() {

    stats.startCommit();
    verifyIncInt("commitsInProgress", 1);
    stats.endCommit(5);
    verifyIncInt("commitsInProgress", -1);
    verifyIncInt("commits", 1);
    // Because the initial stat time is 0 and the final time is 5, the delta is -5
    verifyIncLong("commitTime", -5);
  }

  @Test
  public void shouldPollSuppliersForDocumentStat() {
    stats.addDocumentsSupplier(() -> 5);
    stats.addDocumentsSupplier(() -> 3);

    int documentsId = type.nameToId("documents");
    ArgumentCaptor<IntSupplier> documentsSupplierCaptor =
        ArgumentCaptor.forClass(IntSupplier.class);
    verify(statistics).setIntSupplier(eq(documentsId), documentsSupplierCaptor.capture());
    IntSupplier documentsSuppler = documentsSupplierCaptor.getValue();
    assertEquals(8, documentsSuppler.getAsInt());
  }

  private void verifyIncInt(final String statName, final int value) {
    final int statId = type.nameToId(statName);
    verify(statistics).incInt(eq(statId), eq(value));
  }

  private void verifyIncLong(final String statName, final long value) {
    final int statId = type.nameToId(statName);
    verify(statistics).incLong(eq(statId), eq(value));
  }

}
