/*
 * 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.sdk.transforms.windowing;

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

import org.apache.beam.sdk.transforms.windowing.Trigger.OnceTrigger;
import org.joda.time.Duration;
import org.joda.time.Instant;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests the {@link AfterProcessingTime}.
 */
@RunWith(JUnit4.class)
public class AfterProcessingTimeTest {

  @Test
  public void testFireDeadline() throws Exception {
    assertEquals(BoundedWindow.TIMESTAMP_MAX_VALUE,
        AfterProcessingTime.pastFirstElementInPane().getWatermarkThatGuaranteesFiring(
            new IntervalWindow(new Instant(0), new Instant(10))));
  }

  @Test
  public void testContinuation() throws Exception {
    OnceTrigger firstElementPlus1 =
        AfterProcessingTime.pastFirstElementInPane().plusDelayOf(Duration.standardHours(1));
    assertEquals(
        AfterSynchronizedProcessingTime.ofFirstElement(),
        firstElementPlus1.getContinuationTrigger());
  }

  /**
   * Basic test of compatibility check between identical triggers.
   */
  @Test
  public void testCompatibilityIdentical() throws Exception {
    Trigger t1 = AfterProcessingTime.pastFirstElementInPane()
            .plusDelayOf(Duration.standardMinutes(1L));
    Trigger t2 = AfterProcessingTime.pastFirstElementInPane()
            .plusDelayOf(Duration.standardMinutes(1L));
    assertTrue(t1.isCompatible(t2));
  }

  @Test
  public void testToString() {
    Trigger trigger = AfterProcessingTime.pastFirstElementInPane();
    assertEquals("AfterProcessingTime.pastFirstElementInPane()", trigger.toString());
  }

  @Test
  public void testWithDelayToString() {
    Trigger trigger = AfterProcessingTime.pastFirstElementInPane()
        .plusDelayOf(Duration.standardMinutes(5));

    assertEquals("AfterProcessingTime.pastFirstElementInPane().plusDelayOf(5 minutes)",
        trigger.toString());
  }

  @Test
  public void testBuiltUpToString() {
    Trigger trigger = AfterWatermark.pastEndOfWindow()
        .withLateFirings(AfterProcessingTime
            .pastFirstElementInPane()
            .plusDelayOf(Duration.standardMinutes(10)));

    String expected = "AfterWatermark.pastEndOfWindow()"
        + ".withLateFirings(AfterProcessingTime"
        + ".pastFirstElementInPane()"
        + ".plusDelayOf(10 minutes))";

    assertEquals(expected, trigger.toString());
  }
}
