/*
 * JBoss, Home of Professional Open Source
 * Copyright 2016, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.weld.bootstrap.events.configurator;

import static org.jboss.weld.util.Preconditions.checkArgumentNotNull;
import static org.jboss.weld.util.reflection.Reflections.cast;

import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Function;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.enterprise.inject.spi.Producer;
import javax.enterprise.inject.spi.configurator.ProducerConfigurator;

/**
 *
 * @author Martin Kouba
 *
 * @param <T>
 */
public class ProducerConfiguratorImpl<T> implements ProducerConfigurator<T>, Configurator<Producer<T>> {

    private Function<CreationalContext<T>, T> produceCallback;

    private Consumer<T> disposeCallback;

    private final Set<InjectionPoint> injectionPoints;

    /**
     *
     * @param producer
     */
    public ProducerConfiguratorImpl(Producer<T> producer) {
        this.produceCallback = (c) -> producer.produce(c);
        this.disposeCallback = (i) -> producer.dispose(i);
        this.injectionPoints = producer.getInjectionPoints();
    }

    @Override
    public <U extends T> ProducerConfigurator<T> produceWith(Function<CreationalContext<U>, U> callback) {
        checkArgumentNotNull(callback);
        this.produceCallback = cast(callback);
        return this;
    }

    @Override
    public ProducerConfigurator<T> disposeWith(Consumer<T> callback) {
        checkArgumentNotNull(callback);
        this.disposeCallback = cast(callback);
        return this;
    }

    public Producer<T> complete() {
        return new ProducerImpl<>(this);
    }

    /**
    *
    *
    * @param <T>
    */
   static class ProducerImpl<T> implements Producer<T> {

       private final Function<CreationalContext<T>, T> produceCallback;

       private final Consumer<T> disposeCallback;

       private final Set<InjectionPoint> injectionPoints;

       ProducerImpl(ProducerConfiguratorImpl<T> configurator) {
           this.injectionPoints = configurator.injectionPoints;
           this.produceCallback = configurator.produceCallback;
           this.disposeCallback = configurator.disposeCallback;
       }

       @Override
       public T produce(CreationalContext<T> ctx) {
           return produceCallback.apply(ctx);
       }

       @Override
       public void dispose(T instance) {
           disposeCallback.accept(instance);
       }

       @Override
       public Set<InjectionPoint> getInjectionPoints() {
           return injectionPoints;
       }

   }

}