/*
 * Copyright 2013-present Facebook, Inc.
 *
 * 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.python;

import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.python.PythonLibraryDescription.Arg;
import com.facebook.buck.rules.BuildRuleParams;
import com.facebook.buck.rules.BuildRuleResolver;
import com.facebook.buck.rules.BuildRuleType;
import com.facebook.buck.rules.Description;
import com.facebook.buck.rules.ImmutableBuildRuleType;
import com.facebook.buck.rules.SourcePath;
import com.facebook.buck.rules.SourcePathResolver;
import com.facebook.buck.rules.coercer.Either;
import com.facebook.infer.annotation.SuppressFieldNotInitialized;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedSet;

import java.nio.file.Path;

public class PythonLibraryDescription implements Description<Arg> {

  public static final BuildRuleType TYPE = ImmutableBuildRuleType.of("python_library");

  @SuppressFieldNotInitialized
  public static class Arg {
    public Optional<Either<
        ImmutableSortedSet<SourcePath>,
        ImmutableMap<String, SourcePath>>>
            srcs;
    public Optional<Either<
        ImmutableSortedSet<SourcePath>,
        ImmutableMap<String, SourcePath>>>
            resources;
    public Optional<ImmutableSortedSet<BuildTarget>> deps;
    public Optional<String> baseModule;
  }

  @Override
  public BuildRuleType getBuildRuleType() {
    return TYPE;
  }

  @Override
  public Arg createUnpopulatedConstructorArg() {
    return new Arg();
  }

  @Override
  public <A extends Arg> PythonLibrary createBuildRule(
      BuildRuleParams params,
      BuildRuleResolver resolver,
      A args) {
    SourcePathResolver pathResolver = new SourcePathResolver(resolver);
    Path baseModule = PythonUtil.getBasePath(params.getBuildTarget(), args.baseModule);
    return new PythonLibrary(
        params,
        pathResolver,
        PythonUtil.toModuleMap(
            params.getBuildTarget(),
            pathResolver,
            "srcs",
            baseModule, args.srcs),
        PythonUtil.toModuleMap(
            params.getBuildTarget(),
            pathResolver,
            "resources",
            baseModule, args.resources));
  }

}