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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.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.Provider;
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 com.google.inject.util.Providers;

import java.util.Set;

class ProviderInstanceBindingImpl extends BindingImpl implements ProviderInstanceBinding {

  final javax.inject.Provider providerInstance;
  final ImmutableSet injectionPoints;

  public ProviderInstanceBindingImpl(InjectorImpl injector, Key key,
      Object source, InternalFactory internalFactory, Scoping scoping,
      javax.inject.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, javax.inject.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 Providers.guicify(providerInstance);
  }
  
  public javax.inject.Provider getUserSuppliedProvider() {
    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(getUserSuppliedProvider()));
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(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());
  }
}