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/*
 * Copyright (C) 2018 The Dagger Authors.
 *
 * 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.binding;

import static dagger.internal.codegen.binding.BindingType.PRODUCTION;

import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import dagger.internal.codegen.model.BindingKind;
import dagger.internal.codegen.model.ComponentPath;
import dagger.internal.codegen.model.DaggerElement;
import dagger.internal.codegen.model.DaggerTypeElement;
import dagger.internal.codegen.model.DependencyRequest;
import dagger.internal.codegen.model.Key;
import dagger.internal.codegen.model.Scope;
import java.util.Optional;
import javax.inject.Inject;

/**
 * An implementation of {@link dagger.internal.codegen.model.Binding} that also exposes {@link
 * BindingDeclaration}s associated with the binding.
 */
// TODO(dpb): Consider a supertype of dagger.internal.codegen.model.Binding that
// dagger.internal.codegen.binding.Binding
// could also implement.
@AutoValue
public abstract class BindingNode implements dagger.internal.codegen.model.Binding {
  private BindingDeclarationFormatter bindingDeclarationFormatter;

  public abstract Binding delegate();

  public abstract ImmutableSet multibindingDeclarations();

  public abstract ImmutableSet optionalBindingDeclarations();

  public abstract ImmutableSet subcomponentDeclarations();

  /**
   * The elements (other than the binding's {@link #bindingElement()}) that are associated with the
   * binding.
   *
   * 
   *   {@linkplain BindsOptionalOf optional binding} declarations
   *   
{@linkplain Module#subcomponents() module subcomponent} declarations
   *   
{@linkplain Multibinds multibinding} declarations
   * 
   */
  public final Iterable associatedDeclarations() {
    return Iterables.concat(
        multibindingDeclarations(), optionalBindingDeclarations(), subcomponentDeclarations());
  }

  @Override
  public Key key() {
    return delegate().key();
  }

  @Override
  public ImmutableSet dependencies() {
    return delegate().dependencies();
  }

  @Override
  public Optional bindingElement() {
    return delegate().bindingElement().map(DaggerElement::from);
  }

  @Override
  public Optional contributingModule() {
    return delegate().contributingModule().map(DaggerTypeElement::from);
  }

  @Override
  public boolean requiresModuleInstance() {
    return delegate().requiresModuleInstance();
  }

  @Override
  public Optional scope() {
    return delegate().scope();
  }

  @Override
  public boolean isNullable() {
    return delegate().isNullable();
  }

  @Override
  public boolean isProduction() {
    return delegate().bindingType().equals(PRODUCTION);
  }

  @Override
  public BindingKind kind() {
    return delegate().kind();
  }

  @Override
  public final String toString() {
    return bindingDeclarationFormatter.format(delegate());
  }

  static final class Factory {
    private final BindingDeclarationFormatter bindingDeclarationFormatter;

    @Inject
    Factory(BindingDeclarationFormatter bindingDeclarationFormatter) {
      this.bindingDeclarationFormatter = bindingDeclarationFormatter;
    }

    public BindingNode forContributionBindings(
        ComponentPath component,
        ContributionBinding delegate,
        Iterable multibindingDeclarations,
        Iterable optionalBindingDeclarations,
        Iterable subcomponentDeclarations) {
      return create(
          component,
          delegate,
          ImmutableSet.copyOf(multibindingDeclarations),
          ImmutableSet.copyOf(optionalBindingDeclarations),
          ImmutableSet.copyOf(subcomponentDeclarations));
    }

    public BindingNode forMembersInjectionBinding(
        ComponentPath component, MembersInjectionBinding delegate) {
      return create(component, delegate, ImmutableSet.of(), ImmutableSet.of(), ImmutableSet.of());
    }

    private BindingNode create(
        ComponentPath component,
        Binding delegate,
        ImmutableSet multibindingDeclarations,
        ImmutableSet optionalBindingDeclarations,
        ImmutableSet subcomponentDeclarations) {
      BindingNode node =
          new AutoValue_BindingNode(
              component,
              delegate,
              multibindingDeclarations,
              optionalBindingDeclarations,
              subcomponentDeclarations);
      node.bindingDeclarationFormatter = bindingDeclarationFormatter;
      return node;
    }
  }
}