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/*
 * Copyright © 2019 Dominokit
 *
 * 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.jackson.deser.array.cast;

import elemental2.core.JsArray;
import elemental2.core.JsString;
import jsinterop.base.Js;
import org.dominokit.jackson.JacksonContext;
import org.dominokit.jackson.stream.JsonReader;
import org.dominokit.jackson.stream.JsonToken;

/** The JS implementation for reading a String array json */
public class JsStringArrayReader implements JacksonContext.StringArrayReader {
  /** {@inheritDoc} */
  @Override
  public String[] readArray(JsonReader reader) {
    JsArray jsArray = new JsArray<>();
    reader.beginArray();
    while (JsonToken.END_ARRAY != reader.peek()) {
      if (JsonToken.NULL == reader.peek()) {
        reader.skipValue();
        jsArray.push(null);
      } else {
        jsArray.push((JsString) Js.cast(reader.nextString()));
      }
    }
    reader.endArray();

    return reinterpretCast(jsArray);
  }

  private static String[] reinterpretCast(JsArray value) {
    JsArray slice = value.slice();
    return Js.uncheckedCast(slice.asArray(new JsString[slice.length]));
  }
}