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/*
Copyright (C) 2007 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 com.google.inject.internal;

import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.internal.util.ImmutableSet;
import com.google.inject.internal.util.Objects;
import com.google.inject.internal.util.ToStringBuilder;
import com.google.inject.spi.BindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.ProviderInstanceBinding;
import com.google.inject.spi.ProviderWithExtensionVisitor;

import java.util.Set;

final class ProviderInstanceBindingImpl extends BindingImpl
    implements ProviderInstanceBinding {

  final Provider providerInstance;
  final ImmutableSet injectionPoints;

  public ProviderInstanceBindingImpl(InjectorImpl injector, Key key,
      Object source, InternalFactory internalFactory, Scoping scoping,
      Provider providerInstance,
      Set injectionPoints) {
    super(injector, key, source, internalFactory, scoping);
    this.providerInstance = providerInstance;
    this.injectionPoints = ImmutableSet.copyOf(injectionPoints);
  }

  public ProviderInstanceBindingImpl(Object source, Key key, Scoping scoping,
      Set injectionPoints, Provider providerInstance) {
    super(source, key, scoping);
    this.injectionPoints = ImmutableSet.copyOf(injectionPoints);
    this.providerInstance = providerInstance;
  }

  @SuppressWarnings("unchecked") // the extension type is always consistent with the provider type
  public  V acceptTargetVisitor(BindingTargetVisitor visitor) {
    if(providerInstance instanceof ProviderWithExtensionVisitor) {
      return ((ProviderWithExtensionVisitor) providerInstance)
          .acceptExtensionVisitor(visitor, this);
    } else {
      return visitor.visit(this);
    }
  }

  public Provider getProviderInstance() {
    return providerInstance;
  }

  public Set getInjectionPoints() {
    return injectionPoints;
  }

  public Set> getDependencies() {
    return providerInstance instanceof HasDependencies
        ? ImmutableSet.copyOf(((HasDependencies) providerInstance).getDependencies())
        : Dependency.forInjectionPoints(injectionPoints);
  }

  public BindingImpl withScoping(Scoping scoping) {
    return new ProviderInstanceBindingImpl(
        getSource(), getKey(), scoping, injectionPoints, providerInstance);
  }

  public BindingImpl withKey(Key key) {
    return new ProviderInstanceBindingImpl(
        getSource(), key, getScoping(), injectionPoints, providerInstance);
  }

  public void applyTo(Binder binder) {
    getScoping().applyTo(
        binder.withSource(getSource()).bind(getKey()).toProvider(getProviderInstance()));
  }

  @Override
  public String toString() {
    return new ToStringBuilder(ProviderInstanceBinding.class)
        .add("key", getKey())
        .add("source", getSource())
        .add("scope", getScoping())
        .add("provider", providerInstance)
        .toString();
  }
  
  @Override
  public boolean equals(Object obj) {
    if(obj instanceof ProviderInstanceBindingImpl) {
      ProviderInstanceBindingImpl o = (ProviderInstanceBindingImpl)obj;
      return getKey().equals(o.getKey())
        && getScoping().equals(o.getScoping())
        && Objects.equal(providerInstance, o.providerInstance);
    } else {
      return false;
    }
  }
  
  @Override
  public int hashCode() {
    return Objects.hashCode(getKey(), getScoping());
  }
}