// Copyright 2017 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.exec;

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

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.FilesetOutputSymlink;
import com.google.devtools.build.lib.actions.HasDigest;
import com.google.devtools.build.lib.shell.Command;
import com.google.devtools.build.lib.vfs.DigestHashFunction;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import java.util.Map;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@link SymlinkTreeHelper}. */
@RunWith(JUnit4.class)
public final class SymlinkTreeHelperTest {
  private final FileSystem fs = new InMemoryFileSystem(DigestHashFunction.SHA256);

  @Test
  public void checkCreatedSpawn() {
    Path execRoot = fs.getPath("/my/workspace");
    Path inputManifestPath = execRoot.getRelative("input_manifest");
    BinTools binTools =
        BinTools.forUnitTesting(execRoot, ImmutableList.of(SymlinkTreeHelper.BUILD_RUNFILES));
    Command command =
        new SymlinkTreeHelper(inputManifestPath, execRoot.getRelative("output/MANIFEST"), false)
            .createCommand(execRoot, binTools, ImmutableMap.of());
    assertThat(command.getEnvironmentVariables()).isEmpty();
    assertThat(command.getWorkingDirectory()).isEqualTo(execRoot.getPathFile());
    String[] commandLine = command.getCommandLineElements();
    assertThat(commandLine).hasLength(3);
    assertThat(commandLine[0]).endsWith(SymlinkTreeHelper.BUILD_RUNFILES);
    assertThat(commandLine[1]).isEqualTo("input_manifest");
    assertThat(commandLine[2]).isEqualTo("output/MANIFEST");
  }

  @Test
  public void readManifest() {
    PathFragment execRoot = PathFragment.create("/my/workspace");

    FilesetOutputSymlink link =
        FilesetOutputSymlink.createForTesting(
            PathFragment.create("from"), PathFragment.create("to"), execRoot);

    Map<PathFragment, PathFragment> symlinks =
        SymlinkTreeHelper.processFilesetLinks(
            ImmutableList.of(link), PathFragment.create("root"), execRoot);
    assertThat(symlinks)
        .containsExactly(PathFragment.create("root/from"), PathFragment.create("to"));
  }

  @Test
  public void readMultilineManifest() {
    PathFragment execRoot = PathFragment.create("/my/workspace");

    FilesetOutputSymlink link1 =
        FilesetOutputSymlink.createForTesting(
            PathFragment.create("from"), PathFragment.create("to"), execRoot);
    FilesetOutputSymlink link2 =
        FilesetOutputSymlink.createForTesting(
            PathFragment.create("foo"), PathFragment.create("/bar"), execRoot);
    FilesetOutputSymlink link3 =
        FilesetOutputSymlink.createAlreadyRelativized(
            PathFragment.create("rel"), PathFragment.create("path"), HasDigest.EMPTY, true, true);
    FilesetOutputSymlink link4 =
        FilesetOutputSymlink.createAlreadyRelativized(
            PathFragment.create("rel2"),
            PathFragment.create("/path"),
            HasDigest.EMPTY,
            false,
            false);

    Map<PathFragment, PathFragment> symlinks =
        SymlinkTreeHelper.processFilesetLinks(
            ImmutableList.of(link1, link2, link3, link4), PathFragment.create("root2"), execRoot);
    assertThat(symlinks)
        .containsExactly(
            PathFragment.create("root2/from"),
            PathFragment.create("to"),
            PathFragment.create("root2/foo"),
            PathFragment.create("/bar"),
            PathFragment.create("root2/rel"),
            execRoot.getRelative("path"),
            PathFragment.create("root2/rel2"),
            PathFragment.create("/path"));
  }
}
