// Copyright 2014 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.bazel.repository;

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

import com.google.common.base.Optional;
import com.google.devtools.build.lib.clock.BlazeClock;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests {@link StripPrefixedPath}.
 */
@RunWith(JUnit4.class)
public class StripPrefixedPathTest {
  @Test
  public void testStrip() {
    StripPrefixedPath result = StripPrefixedPath.maybeDeprefix("foo/bar", Optional.of("foo"));
    assertThat(PathFragment.create("bar")).isEqualTo(result.getPathFragment());
    assertThat(result.foundPrefix()).isTrue();
    assertThat(result.skip()).isFalse();

    result = StripPrefixedPath.maybeDeprefix("foo", Optional.of("foo"));
    assertThat(result.skip()).isTrue();

    result = StripPrefixedPath.maybeDeprefix("bar/baz", Optional.of("foo"));
    assertThat(result.foundPrefix()).isFalse();

    result = StripPrefixedPath.maybeDeprefix("foof/bar", Optional.of("foo"));
    assertThat(result.foundPrefix()).isFalse();
  }

  @Test
  public void testAbsolute() {
    StripPrefixedPath result = StripPrefixedPath.maybeDeprefix(
        "/foo/bar", Optional.<String>absent());
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("foo/bar"));

    result = StripPrefixedPath.maybeDeprefix("///foo/bar/baz", Optional.<String>absent());
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("foo/bar/baz"));

    result = StripPrefixedPath.maybeDeprefix("/foo/bar/baz", Optional.of("/foo"));
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("bar/baz"));
  }

  @Test
  public void testWindowsAbsolute() {
    if (OS.getCurrent() != OS.WINDOWS) {
      return;
    }
    StripPrefixedPath result = StripPrefixedPath.maybeDeprefix(
        "c:/foo/bar", Optional.<String>absent());
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("foo/bar"));
  }

  @Test
  public void testNormalize() {
    StripPrefixedPath result = StripPrefixedPath.maybeDeprefix(
        "../bar", Optional.<String>absent());
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("../bar"));

    result = StripPrefixedPath.maybeDeprefix("foo/../baz", Optional.<String>absent());
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("baz"));

    result = StripPrefixedPath.maybeDeprefix("foo/../baz", Optional.of("foo"));
    assertThat(result.getPathFragment()).isEqualTo(PathFragment.create("baz"));
  }

  @Test
  public void testDeprefixSymlink() {
    InMemoryFileSystem fileSystem = new InMemoryFileSystem(BlazeClock.instance());

    PathFragment relativeNoPrefix =
        StripPrefixedPath.maybeDeprefixSymlink(
            PathFragment.create("a/b"), Optional.absent(), fileSystem.getPath("/usr"));
    // there is no attempt to get absolute path for the relative symlinks target path
    assertThat(relativeNoPrefix).isEqualTo(PathFragment.create("a/b"));

    PathFragment absoluteNoPrefix =
        StripPrefixedPath.maybeDeprefixSymlink(
            PathFragment.create("/a/b"), Optional.absent(), fileSystem.getPath("/usr"));
    assertThat(absoluteNoPrefix).isEqualTo(PathFragment.create("/usr/a/b"));

    PathFragment absolutePrefix =
        StripPrefixedPath.maybeDeprefixSymlink(
            PathFragment.create("/root/a/b"), Optional.of("root"), fileSystem.getPath("/usr"));
    assertThat(absolutePrefix).isEqualTo(PathFragment.create("/usr/a/b"));

    PathFragment relativePrefix =
        StripPrefixedPath.maybeDeprefixSymlink(
            PathFragment.create("root/a/b"), Optional.of("root"), fileSystem.getPath("/usr"));
    // there is no attempt to get absolute path for the relative symlinks target path
    assertThat(relativePrefix).isEqualTo(PathFragment.create("a/b"));
  }
}