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/*
 * Copyright (C) 2020-2024 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.extension.responsetemplating.helpers;

import com.github.jknack.handlebars.Options;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;

public class PickRandomHelper extends HandlebarsHelper {

  @Override
  @SuppressWarnings("unchecked")
  public Object apply(Object context, Options options) throws IOException {
    if (context == null) {
      return this.handleError(
          "Must specify either a single list argument or a set of single value arguments.");
    }

    List valueList = new ArrayList<>();
    if (Iterable.class.isAssignableFrom(context.getClass())) {
      ((Iterable) context).forEach(valueList::add);
    } else {
      valueList.add(context);
      valueList.addAll(Arrays.asList(options.params));
    }

    Integer count = (Integer) options.hash.get("count");
    if (count != null && count > 0) {
      int desiredLength = Math.min(valueList.size(), count);
      for (int i = 0; i < desiredLength; i++) {
        Collections.swap(valueList, i, ThreadLocalRandom.current().nextInt(i, valueList.size()));
      }
      return valueList.subList(0, desiredLength);
    }

    int index = ThreadLocalRandom.current().nextInt(valueList.size());
    return valueList.get(index);
  }
}
    

    

    

            

    

            



    
    






    
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