/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.linkedin.pinot.core.segment.creator.impl.fwd;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;

import org.apache.commons.io.FileUtils;

import com.linkedin.pinot.common.data.FieldSpec;
import com.linkedin.pinot.core.io.writer.SingleColumnMultiValueWriter;
import com.linkedin.pinot.core.io.writer.impl.v1.FixedBitMultiValueWriter;
import com.linkedin.pinot.core.segment.creator.MultiValueForwardIndexCreator;
import com.linkedin.pinot.core.segment.creator.impl.V1Constants;


public class MultiValueUnsortedForwardIndexCreator implements MultiValueForwardIndexCreator, Closeable {

  private final File forwardIndexFile;
  private final FieldSpec spec;
  private int maxNumberOfBits = 0;
  private SingleColumnMultiValueWriter mVWriter;

  public MultiValueUnsortedForwardIndexCreator(FieldSpec spec, File baseIndexDir, int cardinality, int numDocs,
      int totalNumberOfValues, boolean hasNulls) throws Exception {

    forwardIndexFile = new File(baseIndexDir, spec.getName() + V1Constants.Indexes.UN_SORTED_MV_FWD_IDX_FILE_EXTENTION);
    this.spec = spec;
    FileUtils.touch(forwardIndexFile);
    maxNumberOfBits = SingleValueUnsortedForwardIndexCreator.getNumOfBits(cardinality);
    mVWriter = new FixedBitMultiValueWriter(forwardIndexFile, numDocs, totalNumberOfValues, maxNumberOfBits);
  }

  @Override
  public void index(int docId, int[] dictionaryIndices) {
    final int[] entries = Arrays.copyOf(dictionaryIndices, dictionaryIndices.length);
    Arrays.sort(entries);
    mVWriter.setIntArray(docId, entries);
  }

  @Override
  public void close() throws IOException {
    mVWriter.close();
  }

}