/*
 * Copyright (C) 2014 Google, 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 dagger.internal.codegen.writer;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableSet;
import java.io.IOException;
import java.util.Set;
import javax.lang.model.type.WildcardType;

import static dagger.internal.codegen.writer.TypeNames.FOR_TYPE_MIRROR;

public final class WildcardName implements TypeName {
  private final Optional<TypeName> extendsBound;
  private final Optional<TypeName> superBound;

  WildcardName(Optional<TypeName> extendsBound,
      Optional<TypeName> superBound) {
    this.extendsBound = extendsBound;
    this.superBound = superBound;
  }

  static WildcardName forTypeMirror(WildcardType mirror) {
    return new WildcardName(
        Optional.fromNullable(mirror.getExtendsBound()).transform(FOR_TYPE_MIRROR),
        Optional.fromNullable(mirror.getSuperBound()).transform(FOR_TYPE_MIRROR));
  }

  @Override
  public Set<ClassName> referencedClasses() {
    ImmutableSet.Builder<ClassName> builder = new ImmutableSet.Builder<ClassName>();
    if (extendsBound.isPresent()) {
      builder.addAll(extendsBound.get().referencedClasses());
    }
    if (superBound.isPresent()) {
      builder.addAll(superBound.get().referencedClasses());
    }
    return builder.build();
  }

  @Override
  public Appendable write(Appendable appendable, Context context) throws IOException {
    appendable.append('?');
    if (extendsBound.isPresent()) {
      appendable.append(" extends ");
      extendsBound.get().write(appendable, context);
    }
    if (superBound.isPresent()) {
      appendable.append(" super ");
      superBound.get().write(appendable, context);
    }
    return appendable;
  }
}