/**
 * Copyright 2017 Pinterest, 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.pinterest.soundwave.utils;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;

import java.io.IOException;
import java.util.ArrayList;

public class StringArrayOrElementStringDeserializer extends JsonDeserializer {


  public StringArrayOrElementStringDeserializer() {

  }

  @Override
  public Object deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException, JsonProcessingException {
    ObjectCodec oc = jsonParser.getCodec();
    JsonNode node = oc.readTree(jsonParser);
    if (node instanceof ArrayNode) {
      ArrayNode arrayNode = (ArrayNode) node;
      ArrayList<String> ret = new ArrayList<>();
      for (int i = 0; i < arrayNode.size(); i++) {
        ret.add(arrayNode.get(i).textValue());
      }
      return ret.toArray(new String[0]);
    } else {
      return new String[]{node.textValue()};
    }

  }
}