/*
 * 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.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public final class InterfaceWriter extends TypeWriter {
  private final List<TypeVariableName> typeVariables;
  InterfaceWriter(ClassName name) {
    super(name);
    this.typeVariables = Lists.newArrayList();
  }

  public void addTypeVariable(TypeVariableName typeVariable) {
    this.typeVariables.add(typeVariable);
  }

  @Override
  public Appendable write(Appendable appendable, Context context) throws IOException {
    context = context.createSubcontext(FluentIterable.from(nestedTypeWriters)
        .transform(new Function<TypeWriter, ClassName>() {
          @Override public ClassName apply(TypeWriter input) {
            return input.name;
          }
        })
        .toSet());
    writeAnnotations(appendable, context);
    writeModifiers(appendable).append("interface ").append(name.simpleName());
    if (!typeVariables.isEmpty()) {
      appendable.append('<');
      Joiner.on(", ").appendTo(appendable, typeVariables);
      appendable.append('>');
    }
    Iterator<TypeName> implementedTypesIterator = implementedTypes.iterator();
    if (implementedTypesIterator.hasNext()) {
      appendable.append(" extends ");
      implementedTypesIterator.next().write(appendable, context);
      while (implementedTypesIterator.hasNext()) {
        appendable.append(", ");
        implementedTypesIterator.next().write(appendable, context);
      }
    }
    appendable.append(" {");
    for (MethodWriter methodWriter : methodWriters) {
      appendable.append('\n');
      methodWriter.write(new IndentingAppendable(appendable), context);
    }
    for (TypeWriter nestedTypeWriter : nestedTypeWriters) {
      appendable.append('\n');
      nestedTypeWriter.write(new IndentingAppendable(appendable), context);
    }
    appendable.append("}\n");
    return appendable;
  }

  @Override
  public Set<ClassName> referencedClasses() {
    return FluentIterable.from(ImmutableList.<HasClassReferences>of())
        .append(nestedTypeWriters)
        .append(methodWriters)
        .append(implementedTypes)
        .append(annotations)
        .transformAndConcat(HasClassReferences.COMBINER)
        .toSet();
  }
}