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/*
 * 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.lucene.benchmark.utils;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.lucene.util.IOUtils;

/**
 * Split the Reuters SGML documents into Simple Text files containing: Title, Date, Dateline, Body
 */
public class ExtractReuters {
  private Path reutersDir;
  private Path outputDir;

  public ExtractReuters(Path reutersDir, Path outputDir) throws IOException {
    this.reutersDir = reutersDir;
    this.outputDir = outputDir;
    System.out.println("Deleting all files in " + outputDir);
    IOUtils.rm(outputDir);
  }

  public void extract() throws IOException {
    long count = 0;
    Files.createDirectories(outputDir);
    try (DirectoryStream stream = Files.newDirectoryStream(reutersDir, "*.sgm")) {
      for (Path sgmFile : stream) {
        extractFile(sgmFile);
        count++;
      }
    }
    if (count == 0) {
      System.err.println("No .sgm files in " + reutersDir);
    }
  }

  Pattern EXTRACTION_PATTERN = Pattern
      .compile("(.*?)|(.*?)|(.*?)");

  private static String[] META_CHARS = { "&", "<", ">", "\"", "'" };

  private static String[] META_CHARS_SERIALIZATIONS = { "&", "<",
      ">", """, "'" };

  /**
   * Override if you wish to change what is extracted
   */
  protected void extractFile(Path sgmFile) {
    try (BufferedReader reader = Files.newBufferedReader(sgmFile, StandardCharsets.ISO_8859_1)) {
      StringBuilder buffer = new StringBuilder(1024);
      StringBuilder outBuffer = new StringBuilder(1024);

      String line = null;
      int docNumber = 0;
      while ((line = reader.readLine()) != null) {
        // when we see a closing reuters tag, flush the file

        if (line.indexOf(" org.apache.lucene.benchmark.utils.ExtractReuters  ");
  }
  
}