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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.rapidpm.ddi.producer;

import org.rapidpm.ddi.DI;
import org.rapidpm.ddi.Produces;

import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;

public class ProducerLocator {

  //class 2 producer-set
  private static final Map>> RESOLVER_CACHE_FOR_CLASS_2_PRODUCER_SET = new ConcurrentHashMap<>();

  private ProducerLocator() {
  }

  public static void clearCache() {
    RESOLVER_CACHE_FOR_CLASS_2_PRODUCER_SET.clear();
  }

  public static Set> findProducersFor(final Class clazzOrInterf) {
    if (RESOLVER_CACHE_FOR_CLASS_2_PRODUCER_SET.containsKey(clazzOrInterf)) return RESOLVER_CACHE_FOR_CLASS_2_PRODUCER_SET.get(clazzOrInterf);

    final Set> typesAnnotatedWith = DI.getTypesAnnotatedWith(Produces.class)
        .stream()
        .filter(producerClass -> {
          final Produces annotation = producerClass.getAnnotation(Produces.class);
          final Class value = annotation.value();
          return value.equals(clazzOrInterf);
        })
        .collect(Collectors.toSet());

    final Set> unmodifiableSet = Collections.unmodifiableSet(typesAnnotatedWith);
    RESOLVER_CACHE_FOR_CLASS_2_PRODUCER_SET.put(clazzOrInterf, unmodifiableSet);
    return unmodifiableSet;
  }
}