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/*
 * Copyright 2013 Nicolas Morel
 *
 * 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.dominokit.jacksonapt.deser.array;

import java.util.List;
import org.dominokit.jacksonapt.JsonDeserializationContext;
import org.dominokit.jacksonapt.JsonDeserializer;
import org.dominokit.jacksonapt.JsonDeserializerParameters;
import org.dominokit.jacksonapt.stream.JsonReader;

/** Default {@link org.dominokit.jacksonapt.JsonDeserializer} implementation for array. */
public class ArrayJsonDeserializer extends AbstractArrayJsonDeserializer {

  /**
   * A Functional interface to create a new array instance in the deserializer
   *
   * @param  the type of the array elements.
   */
  @FunctionalInterface
  public interface ArrayCreator {
    T[] create(int length);
  }

  /**
   * newInstance
   *
   * @param deserializer {@link org.dominokit.jacksonapt.JsonDeserializer} used to deserialize the
   *     objects inside the array.
   * @param arrayCreator {@link
   *     org.dominokit.jacksonapt.deser.array.ArrayJsonDeserializer.ArrayCreator} used to create a
   *     new array
   * @param  Type of the elements inside the {@link java.util.AbstractCollection}
   * @return a new instance of {@link org.dominokit.jacksonapt.deser.array.ArrayJsonDeserializer}
   */
  public static  ArrayJsonDeserializer newInstance(
      JsonDeserializer deserializer, ArrayCreator arrayCreator) {
    return new ArrayJsonDeserializer(deserializer, arrayCreator);
  }

  private final JsonDeserializer deserializer;

  private final ArrayCreator arrayCreator;

  /**
   * Constructor for ArrayJsonDeserializer.
   *
   * @param deserializer {@link org.dominokit.jacksonapt.JsonDeserializer} used to deserialize the
   *     objects inside the array.
   * @param arrayCreator {@link
   *     org.dominokit.jacksonapt.deser.array.ArrayJsonDeserializer.ArrayCreator} used to create a
   *     new array
   */
  protected ArrayJsonDeserializer(JsonDeserializer deserializer, ArrayCreator arrayCreator) {
    if (null == deserializer) {
      throw new IllegalArgumentException("deserializer cannot be null");
    }
    if (null == arrayCreator) {
      throw new IllegalArgumentException("Cannot deserialize an array without an arrayCreator");
    }
    this.deserializer = deserializer;
    this.arrayCreator = arrayCreator;
  }

  /** {@inheritDoc} */
  @Override
  public T[] doDeserializeArray(
      JsonReader reader, JsonDeserializationContext ctx, JsonDeserializerParameters params) {
    List list = deserializeIntoList(reader, ctx, deserializer, params);
    return list.toArray(arrayCreator.create(list.size()));
  }

  /** {@inheritDoc} */
  @Override
  protected T[] doDeserializeSingleArray(
      JsonReader reader, JsonDeserializationContext ctx, JsonDeserializerParameters params) {
    T[] result = arrayCreator.create(1);
    result[0] = deserializer.deserialize(reader, ctx, params);
    return result;
  }

  /** {@inheritDoc} */
  @Override
  public void setBackReference(
      String referenceName, Object reference, T[] value, JsonDeserializationContext ctx) {
    if (null != value && value.length > 0) {
      for (T val : value) {
        deserializer.setBackReference(referenceName, reference, val, ctx);
      }
    }
  }
}