/*
 * 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.apple;

import com.facebook.buck.model.Flavor;
import com.facebook.buck.model.Flavored;
import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.BuildRuleParams;
import com.facebook.buck.rules.BuildRuleResolver;
import com.facebook.buck.rules.CellPathResolver;
import com.facebook.buck.rules.Description;
import com.facebook.buck.rules.NoopBuildRule;
import com.facebook.buck.rules.TargetGraph;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.common.io.Files;

/**
 * Description for a core_data_model rule, which identifies a model file for use with Apple's Core
 * Data.
 */
public class CoreDataModelDescription implements Description<AppleWrapperResourceArg>, Flavored {

  private static final String CORE_DATA_MODEL_EXTENSION = "xcdatamodel";
  private static final String VERSIONED_CORE_DATA_MODEL_EXTENSION = "xcdatamodeld";

  @Override
  public Class<AppleWrapperResourceArg> getConstructorArgType() {
    return AppleWrapperResourceArg.class;
  }

  @Override
  public BuildRule createBuildRule(
      TargetGraph targetGraph,
      BuildRuleParams params,
      BuildRuleResolver resolver,
      CellPathResolver cellRoots,
      AppleWrapperResourceArg args) {
    String extension = Files.getFileExtension(args.getPath().getFileName().toString());
    Preconditions.checkArgument(
        CORE_DATA_MODEL_EXTENSION.equals(extension)
            || VERSIONED_CORE_DATA_MODEL_EXTENSION.equals(extension));

    return new NoopBuildRule(params);
  }

  public static boolean isVersionedDataModel(AppleWrapperResourceArg arg) {
    return VERSIONED_CORE_DATA_MODEL_EXTENSION.equals(
        Files.getFileExtension(arg.getPath().getFileName().toString()));
  }

  @Override
  public boolean hasFlavors(ImmutableSet<Flavor> flavors) {
    return true;
  }
}