/*
 * Copyright 2017-present Facebook, Inc.
 *
 * Licensed 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 com.facebook.buck.distributed;

import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.model.BuildTargetFactory;
import com.facebook.buck.parser.NoSuchBuildTargetException;
import com.facebook.buck.rules.BuildRuleResolver;
import com.google.common.collect.ImmutableList;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class MinionWorkloadAllocatorTest {

  private static final String MINION_ONE = "Super minion 1";

  private BuildTargetsQueue queue;
  private BuildTarget target;

  @Before
  public void setUp() throws NoSuchBuildTargetException {
    BuildRuleResolver resolver = BuildTargetsQueueTest.createDiamondDependencyResolver();
    target = BuildTargetFactory.newInstance(BuildTargetsQueueTest.TARGET_NAME);
    queue = BuildTargetsQueue.newQueue(resolver, ImmutableList.of(target));
  }

  @Test
  public void testNormalBuildFlow() {
    MinionWorkloadAllocator allocator = new MinionWorkloadAllocator(queue, 2);
    Assert.assertFalse(allocator.isBuildFinished());

    ImmutableList<String> firstTargets = allocator.getTargetsToBuild(MINION_ONE);
    Assert.assertEquals(1, firstTargets.size());
    Assert.assertEquals(firstTargets, allocator.getTargetsToBuild(MINION_ONE));
    allocator.finishedBuildingTargets(MINION_ONE);
    Assert.assertFalse(allocator.isBuildFinished());

    ImmutableList<String> secondTargets = allocator.getTargetsToBuild(MINION_ONE);
    Assert.assertEquals(2, secondTargets.size());
    Assert.assertNotEquals(firstTargets, secondTargets);
    allocator.finishedBuildingTargets(MINION_ONE);
    Assert.assertFalse(allocator.isBuildFinished());

    ImmutableList<String> thirdTargets = allocator.getTargetsToBuild(MINION_ONE);
    Assert.assertEquals(1, thirdTargets.size());
    Assert.assertEquals(target.getFullyQualifiedName(), thirdTargets.get(0));
    allocator.finishedBuildingTargets(MINION_ONE);
    Assert.assertTrue(allocator.isBuildFinished());

    Assert.assertEquals(0, allocator.getTargetsToBuild(MINION_ONE).size());
  }
}