/*
 * 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.json;

import com.facebook.buck.core.build.buildable.context.BuildableContext;
import com.facebook.buck.core.build.context.BuildContext;
import com.facebook.buck.core.model.BuildTarget;
import com.facebook.buck.core.model.impl.BuildTargetPaths;
import com.facebook.buck.core.rules.BuildRuleParams;
import com.facebook.buck.core.rules.impl.AbstractBuildRuleWithDeclaredAndExtraDeps;
import com.facebook.buck.core.sourcepath.ExplicitBuildTargetSourcePath;
import com.facebook.buck.core.sourcepath.SourcePath;
import com.facebook.buck.io.BuildCellRelativePath;
import com.facebook.buck.io.filesystem.ProjectFilesystem;
import com.facebook.buck.step.Step;
import com.facebook.buck.step.fs.MkdirStep;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSortedSet;
import java.nio.file.Path;

/*
 * Concatenates Json arrays in files
 */
public class JsonConcatenate extends AbstractBuildRuleWithDeclaredAndExtraDeps {

  private final String stepShortName;
  private final String stepDescription;
  private ImmutableSortedSet<Path> inputs;
  private Path outputDirectory;
  private Path output;

  public JsonConcatenate(
      BuildTarget buildTarget,
      ProjectFilesystem projectFilesystem,
      BuildRuleParams buildRuleParams,
      ImmutableSortedSet<Path> inputs,
      String stepShortName,
      String stepDescription,
      String outputDirectoryPrefix,
      String outputName) {
    super(buildTarget, projectFilesystem, buildRuleParams);
    this.inputs = inputs;
    this.outputDirectory =
        BuildTargetPaths.getGenPath(
            getProjectFilesystem(), this.getBuildTarget(), outputDirectoryPrefix + "-%s");
    this.output = this.outputDirectory.resolve(outputName);
    this.stepShortName = stepShortName;
    this.stepDescription = stepDescription;
  }

  @Override
  public ImmutableList<Step> getBuildSteps(
      BuildContext context, BuildableContext buildableContext) {
    buildableContext.recordArtifact(output);
    ProjectFilesystem projectFilesystem = getProjectFilesystem();
    return ImmutableList.<Step>builder()
        .add(
            MkdirStep.of(
                BuildCellRelativePath.fromCellRelativePath(
                    context.getBuildCellRootPath(), getProjectFilesystem(), outputDirectory)))
        .add(
            new JsonConcatenateStep(
                projectFilesystem, inputs, output, stepShortName, stepDescription))
        .build();
  }

  @Override
  public SourcePath getSourcePathToOutput() {
    return ExplicitBuildTargetSourcePath.of(getBuildTarget(), output);
  }
}
