// 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.rules;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigurationEnvironment;
import com.google.devtools.build.lib.analysis.config.ConfigurationFragmentFactory;
import com.google.devtools.build.lib.analysis.config.FragmentOptions;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.PathFragment;

/**
 * Bazel-specific configuration fragment.
 */
@Immutable
public class BazelConfiguration extends Fragment {
  /**
   * Loader for Bazel-specific settings.
   */
  public static class Loader implements ConfigurationFragmentFactory {
    @Override
    public Fragment create(ConfigurationEnvironment env, BuildOptions buildOptions)
        throws InvalidConfigurationException {
      return new BazelConfiguration();
    }

    @Override
    public Class<? extends Fragment> creates() {
      return BazelConfiguration.class;
    }

    @Override
    public ImmutableSet<Class<? extends FragmentOptions>> requiredOptions() {
      return ImmutableSet.of();
    }
  }

  public BazelConfiguration() {
  }

  @Override
  public PathFragment getShellExecutable() {
    if (OS.getCurrent() == OS.WINDOWS) {
      String path = System.getenv("BAZEL_SH");
      if (path != null) {
        return new PathFragment(path);
      } else {
        return new PathFragment("c:/tools/msys64/usr/bin/bash.exe");
      }
    }
    if (OS.getCurrent() == OS.FREEBSD) {
      String path = System.getenv("BAZEL_SH");
      if (path != null) {
        return  new PathFragment(path);
      } else {
        return new PathFragment("/usr/local/bin/bash");
      }
    }
    return new PathFragment("/bin/bash");
  }

  @Override
  public void setupShellEnvironment(ImmutableMap.Builder<String, String> builder) {
    String path = System.getenv("PATH");
    builder.put("PATH", path == null ? "/bin:/usr/bin" : path);

    String ldLibraryPath = System.getenv("LD_LIBRARY_PATH");
    if (ldLibraryPath != null) {
      builder.put("LD_LIBRARY_PATH", ldLibraryPath);
    }

    String tmpdir = System.getenv("TMPDIR");
    if (tmpdir != null) {
      builder.put("TMPDIR", tmpdir);
    }
  }
}

@@ -1392,16 +1392,50 @@
 ragment;
+%0Aimport javax.annotation.Nullable;
 %0A%0A/**%0A *
@@ -2834,106 +2834,86 @@
     
-String path = System.getenv(%22PATH%22);%0A    builder.put(%22PATH%22, path == null ? %22/bin:/usr/bin%22 : path
+builder.put(%22PATH%22, pathOrDefault(System.getenv(%22PATH%22), getShellExecutable())
 );%0A%0A
@@ -3174,16 +3174,16 @@
 mpdir);%0A
-
     %7D%0A  
@@ -3183,11 +3183,958 @@
    %7D%0A  %7D
+%0A%0A  private static String pathOrDefault(@Nullable String path, @Nullable PathFragment sh) %7B%0A    if (OS.getCurrent() != OS.WINDOWS) %7B%0A      return path == null ? %22/bin:/usr/bin%22 : path;%0A    %7D%0A%0A    // Attempt to compute the MSYS root (the real Windows path of %22/%22) from %60sh%60.%0A    String newPath = %22%22;%0A    if (sh != null && sh.getParentDirectory() != null) %7B%0A      newPath = sh.getParentDirectory().getPathString();%0A      if (sh.getParentDirectory().endsWith(new PathFragment(%22usr/bin%22))) %7B%0A        newPath +=%0A            %22;%22 + sh.getParentDirectory().getParentDirectory().replaceName(%22bin%22).getPathString();%0A      %7D else if (sh.getParentDirectory().endsWith(new PathFragment(%22bin%22))) %7B%0A        newPath +=%0A            %22;%22 + sh.getParentDirectory().replaceName(%22usr%22).getRelative(%22bin%22).getPathString();%0A      %7D%0A      newPath = newPath.replace('/', '%5C%5C');%0A%0A      if (path != null) %7B%0A        newPath += %22;%22 + path;%0A      %7D%0A    %7D%0A    return newPath;%0A  %7D
 %0A%7D%0A

update PATH for actions on Windows