/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.carbondata.processing.loading.parser.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.apache.carbondata.core.constants.CarbonCommonConstants;
import org.apache.carbondata.processing.loading.complexobjects.ArrayObject;

import org.apache.commons.lang.ArrayUtils;

public class MapParserImpl extends ArrayParserImpl {

  private String keyValueDelimiter;

  public MapParserImpl(String delimiter, String nullFormat, String keyValueDelimiter) {
    super(delimiter, nullFormat);
    this.keyValueDelimiter = keyValueDelimiter;
  }

  //The Key for Map will always be a PRIMITIVE type so Set<Object> here will work fine
  //The last occurance of the key, value pair will be added and all others will be overwritten
  @Override
  public Object parse(Object data) {
    if (data != null) {
      String value = data.toString();
      if (!value.isEmpty() && !value.equals(nullFormat)
          // && !value.equals(keyValueDelimiter)
          && !value.equals(CarbonCommonConstants.SIZE_ZERO_DATA_RETURN)) {
        String[] split = pattern.split(value, -1);
        if (ArrayUtils.isNotEmpty(split)) {
          ArrayList<Object> array = new ArrayList<>();
          Map<Object, String> map = new HashMap<>();
          for (int i = 0; i < split.length; i++) {
            Object[] splitedKeyAndValue = split[i].split(keyValueDelimiter);
            // When both key and value are EMPTY_STRING, the length of the splitted
            // result will be 0. Then the currKey should be initialized as a empty object.
            // Otherwise, the arrayindexoutexception will be throwed.
            Object currKey = splitedKeyAndValue.length > 0 ? split[i].split(keyValueDelimiter)[0]
                : new Object();
            map.put(currKey, split[i]);
          }
          for (Map.Entry<Object, String> entry : map.entrySet()) {
            array.add(child.parse(entry.getValue()));
          }
          return new ArrayObject(array.toArray());
        }
      } else if (value.isEmpty()) {
        Object[] array = new Object[1];
        array[0] = value;
        return new ArrayObject(array);
      } else if (value.equals(CarbonCommonConstants.SIZE_ZERO_DATA_RETURN)) {
        // When the data is not map('','') but map(), an array with zero size should be returned.
        Object[] array = new Object[0];
        return new ArrayObject(array);
      }
    }
    return null;
  }

  @Override
  public Object parseRaw(Object data) {
    Object[] keyValuePairs = ((Object[]) data);
    Object[] objectArray = new Object[keyValuePairs.length];
    for (int i = 0; i < ((Object[]) data).length; i++) {
      objectArray[i] = child.parseRaw(keyValuePairs[i]);
    }
    return new ArrayObject(objectArray);
  }

}
