/*
 * Copyright 2012-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.cli;

import static org.junit.Assert.assertEquals;

import com.facebook.buck.java.DefaultJavaPackageFinder;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;

import org.junit.Test;
import org.kohsuke.args4j.CmdLineException;

import java.util.Map;

public class BuildCommandOptionsTest {

  @Test
  public void testCreateJavaPackageFinder() {
    BuckConfig buckConfig = new FakeBuckConfig(
        ImmutableMap.<String, Map<String, String>>of(
            "java",
            ImmutableMap.of("src_roots", "src, test")));
    DefaultJavaPackageFinder javaPackageFinder = buckConfig.createDefaultJavaPackageFinder();
    assertEquals(ImmutableSortedSet.of(), javaPackageFinder.getPathsFromRoot());
    assertEquals(ImmutableSet.of("src", "test"), javaPackageFinder.getPathElements());
  }

  @Test
  public void testCreateJavaPackageFinderFromEmptyBuckConfig() {
    BuckConfig buckConfig = new FakeBuckConfig();
    DefaultJavaPackageFinder javaPackageFinder = buckConfig.createDefaultJavaPackageFinder();
    assertEquals(ImmutableSortedSet.<String>of(), javaPackageFinder.getPathsFromRoot());
    assertEquals(ImmutableSet.of(), javaPackageFinder.getPathsFromRoot());
  }

  @Test
  public void testShouldSetNumberOfThreadsFromBuckConfig() throws CmdLineException {
    BuckConfig buckConfig = new FakeBuckConfig(ImmutableMap.<String, Map<String, String>>of(
        "build",
        ImmutableMap.of("threads", "3")));
    BuildCommandOptions options = new BuildCommandOptions(buckConfig);
    CmdLineParserAdditionalOptions parser = new CmdLineParserAdditionalOptions(options);
    parser.parseArgument();

    int count = options.getNumThreads();

    assertEquals(3, count);
  }

  @Test
  public void testDefaultsNumberOfBuildThreadsToOneAndAQuarterTheNumberOfAvailableProcessors()
      throws CmdLineException {
    BuckConfig buckConfig = new FakeBuckConfig();
    BuildCommandOptions options = new BuildCommandOptions(buckConfig);
    CmdLineParserAdditionalOptions parser = new CmdLineParserAdditionalOptions(options);
    parser.parseArgument();

    int expected = (int)(Runtime.getRuntime().availableProcessors() * 1.25);

    assertEquals(expected, options.getNumThreads());
  }

  @Test
  public void testCommandLineOptionOverridesOtherBuildThreadSettings() throws CmdLineException {
    BuckConfig buckConfig = new FakeBuckConfig();
    BuildCommandOptions options = new BuildCommandOptions(buckConfig);

    CmdLineParserAdditionalOptions parser = new CmdLineParserAdditionalOptions(options);
    parser.parseArgument("--num-threads", "5");

    assertEquals(5, options.getNumThreads());
  }

}