/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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.cxx.toolchain.nativelink;

import com.facebook.buck.core.model.BuildTarget;
import com.facebook.buck.core.rules.ActionGraphBuilder;
import com.facebook.buck.core.sourcepath.resolver.SourcePathResolverAdapter;
import java.nio.file.Path;
import java.util.Objects;
import java.util.Optional;
import javax.annotation.Nullable;

/** An implementation of {@link NativeLinkTarget} where the behavior is fixed when created. */
public final class NativeLinkTargetInfo implements NativeLinkTarget {
  private final BuildTarget target;
  private final NativeLinkTargetMode targetMode;
  private final Iterable<NativeLinkable> linkableDeps;
  @Nullable private final NativeLinkableInput linkableInput;
  private final Optional<Path> targetOutputPath;

  public NativeLinkTargetInfo(
      BuildTarget target,
      NativeLinkTargetMode targetMode,
      Iterable<NativeLinkable> linkableDeps,
      @Nullable NativeLinkableInput linkableInput,
      Optional<Path> targetOutputPath) {
    this.target = target;
    this.targetMode = targetMode;
    this.linkableDeps = linkableDeps;
    this.linkableInput = linkableInput;
    this.targetOutputPath = targetOutputPath;
  }

  @Override
  public BuildTarget getBuildTarget() {
    return target;
  }

  @Override
  public NativeLinkTargetMode getNativeLinkTargetMode() {
    return targetMode;
  }

  @Override
  public Iterable<? extends NativeLinkable> getNativeLinkTargetDeps(
      ActionGraphBuilder graphBuilder) {
    return linkableDeps;
  }

  @Override
  public NativeLinkableInput getNativeLinkTargetInput(
      ActionGraphBuilder graphBuilder, SourcePathResolverAdapter pathResolver) {
    return Objects.requireNonNull(
        linkableInput,
        String.format("NativeLinkTargetInfo for %s has no NativeLinkableInput.", target));
  }

  @Override
  public Optional<Path> getNativeLinkTargetOutputPath() {
    return targetOutputPath;
  }
}
