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/*
 * Copyright (C) 2019 Knot.x Project
 *
 * 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 io.knotx.server.api.context;

import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import io.vertx.reactivex.core.MultiMap;

final class MultiMapConverter {

  private MultiMapConverter() {
    //util constructor
  }

  /**
   * Converts MultiMap to JsonObject
 It expects the MultiMap key, contains List of String
   * objects, so the result of conversion will look like below
   * 

   *    *   {
   *      "mapKey1": ["val1", "val2"],
   *      "mapKey2": ["val1"]
   *   }
   * 
   *
   * @param multiMap - {@link MultiMap} to convert
   * @return - {@link JsonObject} with {@link JsonArray} under each object key
   */
  static JsonObject toJsonObject(MultiMap multiMap) {
    JsonObject json = new JsonObject();

    multiMap.getDelegate().forEach(
        entry -> {
          JsonArray values;
          if (json.containsKey(entry.getKey())) {
            values = json.getJsonArray(entry.getKey());
          } else {
            values = new JsonArray();
            json.put(entry.getKey(), values);
          }
          values.add(entry.getValue());
        }
    );

    return json;
  }

  /**
   * Converts JsonObject to MultiMap. It expects the JsonObject key, contains JsonArray with list of
   * String objects.

   * Each jsonObject key is converted into MultiMap "key", while JsonArray as List of String objects
   * for this velue.
   *
   * @param json - {@link JsonObject} to convert
   * @return - {@link MultiMap} created from {@link JsonObject}
   */
  static MultiMap fromJsonObject(JsonObject json) {
    MultiMap map = MultiMap.caseInsensitiveMultiMap();

    json.stream()
        .forEach(
            entry ->
                ((JsonArray) entry.getValue())
                    .stream()
                    .forEach(
                        value ->
                            map.add(entry.getKey(), (String) value)
                    )
        );

    return map;
  }
}