// Copyright 2018 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.analysis;

import static com.google.common.truth.Truth.assertThat;

import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.common.options.Options;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Unit tests for {@link ShellConfiguration}.
 */
@RunWith(JUnit4.class)
public class ShellConfigurationTest extends BuildViewTestCase {
  @Test
  public void getShellExecutableUnset() {
    assertThat(determineShellExecutable(OS.LINUX, null))
        .isEqualTo(PathFragment.create("/bin/bash"));
    assertThat(determineShellExecutable(OS.FREEBSD, null))
        .isEqualTo(PathFragment.create("/usr/local/bin/bash"));
    assertThat(determineShellExecutable(OS.WINDOWS, null))
        .isEqualTo(PathFragment.create("c:/tools/msys64/usr/bin/bash.exe"));
  }

  @Test
  public void getShellExecutableIfSet() {
    PathFragment binBash = PathFragment.create("/bin/bash");
    assertThat(determineShellExecutable(OS.LINUX, binBash))
        .isEqualTo(PathFragment.create("/bin/bash"));
    assertThat(determineShellExecutable(OS.FREEBSD, binBash))
        .isEqualTo(PathFragment.create("/bin/bash"));
    assertThat(determineShellExecutable(OS.WINDOWS, binBash))
        .isEqualTo(PathFragment.create("/bin/bash"));
  }

  @Test
  public void optionsAlsoApplyToHost() {
    ShellConfiguration.Options o = Options.getDefaults(ShellConfiguration.Options.class);
    o.shellExecutable = PathFragment.create("/my/shell/binary");
    ShellConfiguration.Options h = o.getHost();
    assertThat(h.shellExecutable).isEqualTo(PathFragment.create("/my/shell/binary"));
  }

  private static PathFragment determineShellExecutable(OS os, PathFragment executableOption) {
    ShellConfiguration.Options options = Options.getDefaults(ShellConfiguration.Options.class);
    options.shellExecutable = executableOption;
    return ShellConfiguration.Loader.determineShellExecutable(
        os, options, PathFragment.create("/bin/bash"));
  }
}