/*
 * 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.beam.runners.core.metrics;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.util.HashSet;
import java.util.Set;
import org.apache.beam.sdk.metrics.MetricName;
import org.apache.beam.sdk.metrics.MetricNameFilter;
import org.apache.beam.sdk.metrics.MetricsFilter;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for {@link MetricFiltering}.
 */
@RunWith(JUnit4.class)
public class MetricFilteringTest {
  private static final MetricName NAME1 = MetricName.named("ns1", "name1");


  private boolean matchesSubPath(String actualScope, String subPath) {
    return MetricFiltering.subPathMatches(actualScope, subPath);
  }

  @Test
  public void testMatchCompositeStepNameFilters() {
    // MetricsFilter with a Class-namespace + name filter + step filter.
    // Successful match.
    assertTrue(MetricFiltering.matches(
        MetricsFilter.builder().addNameFilter(
            MetricNameFilter.named(MetricFilteringTest.class, "myMetricName"))
            .addStep("myStep").build(),
        MetricKey.create(
            "myBigStep/myStep", MetricName.named(MetricFilteringTest.class, "myMetricName"))));

    // Unsuccessful match.
    assertFalse(MetricFiltering.matches(
        MetricsFilter.builder().addNameFilter(
            MetricNameFilter.named(MetricFilteringTest.class, "myMetricName"))
            .addStep("myOtherStep").build(),
        MetricKey.create(
            "myOtherStepNoMatch/myStep",
            MetricName.named(MetricFilteringTest.class, "myMetricName"))));
  }

  @Test
  public void testMatchStepNameFilters() {
    // MetricsFilter with a Class-namespace + name filter + step filter.
    // Successful match.
    assertTrue(MetricFiltering.matches(
        MetricsFilter.builder().addNameFilter(
            MetricNameFilter.named(MetricFilteringTest.class, "myMetricName"))
        .addStep("myStep").build(),
        MetricKey.create("myStep", MetricName.named(MetricFilteringTest.class, "myMetricName"))));

    // Unsuccessful match.
    assertFalse(MetricFiltering.matches(
        MetricsFilter.builder().addNameFilter(
            MetricNameFilter.named(MetricFilteringTest.class, "myMetricName"))
        .addStep("myOtherStep").build(),
        MetricKey.create("myStep", MetricName.named(MetricFilteringTest.class, "myMetricName"))));
  }

  @Test
  public void testMatchClassNamespaceFilters() {
    // MetricsFilter with a Class-namespace + name filter. Without step filter.
    // Successful match.
    assertTrue(MetricFiltering.matches(
        MetricsFilter.builder().addNameFilter(
            MetricNameFilter.named(MetricFilteringTest.class, "myMetricName")).build(),
        MetricKey.create("anyStep", MetricName.named(MetricFilteringTest.class, "myMetricName"))));

    // Unsuccessful match.
    assertFalse(MetricFiltering.matches(
        MetricsFilter.builder().addNameFilter(
            MetricNameFilter.named(MetricFilteringTest.class, "myMetricName")).build(),
        MetricKey.create("anyStep", MetricName.named(MetricFiltering.class, "myMetricName"))));
  }

  @Test
  public void testMatchStringNamespaceFilters() {
    // MetricsFilter with a String-namespace + name filter. Without step filter.
    // Successful match.
    assertTrue(
        MetricFiltering.matches(
            MetricsFilter.builder().addNameFilter(
                MetricNameFilter.named("myNamespace", "myMetricName")).build(),
            MetricKey.create("anyStep", MetricName.named("myNamespace", "myMetricName"))));

    // Unsuccessful match.
    assertFalse(
        MetricFiltering.matches(
            MetricsFilter.builder().addNameFilter(
                MetricNameFilter.named("myOtherNamespace", "myMetricName")).build(),
            MetricKey.create("anyStep", MetricName.named("myNamespace", "myMetricname"))));
  }

  @Test
  public void testMatchesSubPath() {
    assertTrue("Match of the first element",
        matchesSubPath("Top1/Outer1/Inner1/Bottom1", "Top1"));
    assertTrue("Match of the first elements",
        matchesSubPath("Top1/Outer1/Inner1/Bottom1", "Top1/Outer1"));
    assertTrue("Match of the last elements",
        matchesSubPath("Top1/Outer1/Inner1/Bottom1", "Inner1/Bottom1"));
    assertFalse("Substring match but no subpath match",
        matchesSubPath("Top1/Outer1/Inner1/Bottom1", "op1/Outer1/Inner1"));
    assertFalse("Substring match from start - but no subpath match",
        matchesSubPath("Top1/Outer1/Inner1/Bottom1", "Top"));
  }

  private boolean matchesScopeWithSingleFilter(String actualScope, String filter) {
    Set<String> scopeFilter = new HashSet<String>();
    scopeFilter.add(filter);
    return MetricFiltering.matchesScope(actualScope, scopeFilter);
  }

  @Test
  public void testMatchesScope() {
    assertTrue(matchesScopeWithSingleFilter("Top1/Outer1/Inner1/Bottom1", "Top1"));
    assertTrue(matchesScopeWithSingleFilter(
        "Top1/Outer1/Inner1/Bottom1", "Top1/Outer1/Inner1/Bottom1"));
    assertTrue(matchesScopeWithSingleFilter("Top1/Outer1/Inner1/Bottom1", "Top1/Outer1"));
    assertTrue(matchesScopeWithSingleFilter("Top1/Outer1/Inner1/Bottom1", "Top1/Outer1/Inner1"));
    assertFalse(matchesScopeWithSingleFilter("Top1/Outer1/Inner1/Bottom1", "Top1/Inner1"));
    assertFalse(matchesScopeWithSingleFilter("Top1/Outer1/Inner1/Bottom1", "Top1/Outer1/Inn"));
  }
}