/*
 * 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.triggers;

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

import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
import org.apache.beam.sdk.transforms.windowing.FixedWindows;
import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
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 for {@link ReshuffleTriggerStateMachine}.
 */
@RunWith(JUnit4.class)
public class ReshuffleTriggerStateMachineTest {

  /** Public so that other tests can instantiate {@link ReshuffleTriggerStateMachine}. */
  public static <W extends BoundedWindow> ReshuffleTriggerStateMachine forTest() {
    return ReshuffleTriggerStateMachine.create();
  }

  @Test
  public void testShouldFire() throws Exception {
    TriggerStateMachineTester<Integer, IntervalWindow> tester =
        TriggerStateMachineTester.forTrigger(
            ReshuffleTriggerStateMachine.create(), FixedWindows.of(Duration.millis(100)));
    IntervalWindow arbitraryWindow = new IntervalWindow(new Instant(300), new Instant(400));
    assertTrue(tester.shouldFire(arbitraryWindow));
  }

  @Test
  public void testOnTimer() throws Exception {
    TriggerStateMachineTester<Integer, IntervalWindow> tester =
        TriggerStateMachineTester.forTrigger(
            ReshuffleTriggerStateMachine.create(), FixedWindows.of(Duration.millis(100)));
    IntervalWindow arbitraryWindow = new IntervalWindow(new Instant(100), new Instant(200));
    tester.fireIfShouldFire(arbitraryWindow);
    assertFalse(tester.isMarkedFinished(arbitraryWindow));
  }

  @Test
  public void testToString() {
    TriggerStateMachine trigger = ReshuffleTriggerStateMachine.create();
    assertEquals("ReshuffleTriggerStateMachine()", trigger.toString());
  }
}