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package org.apache.opennlp.addons.tools.entitylinker.geoentitylinker;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MMapDirectory;
import org.apache.lucene.util.Version;

/**
 *
 * @author Owner
 */
public class GazateerIndexer {

  public enum GazType {

    GEONAMES {
      @Override
      public String toString() {
        return "/opennlp_geoentitylinker_usgsgaz_idx";
      }
    },
    USGS {
      @Override
      public String toString() {
        return "/opennlp_geoentitylinker_usgsgaz_idx";
      }
    }
  }

  public void index(File outputIndexDir, File gazateerInputData, GazType type) throws Exception {
    if (!outputIndexDir.isDirectory()) {
      throw new IllegalArgumentException("outputIndexDir must be a directory.");
    }

    String indexloc = outputIndexDir + type.toString();
    Directory index = new MMapDirectory(new File(indexloc));

    Analyzer a = new StandardAnalyzer(Version.LUCENE_45);
    IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_45, a);

    IndexWriter w = new IndexWriter(index, config);

    readFile(gazateerInputData, w);
    w.commit();
    w.close();

  }

  public void readFile(File gazateerInputData, IndexWriter w) throws Exception {
    BufferedReader reader = new BufferedReader(new FileReader(gazateerInputData));
    List<String> fields = new ArrayList<String>();
    int counter = 0;
    System.out.println("reading gazateer data from file...........");
    while (reader.read() != -1) {
      String line = reader.readLine();
      String[] values = line.split("\\|");//nga format
      if (counter == 0) {
        // build fields
        for (String columnName : values) {
          fields.add(columnName.replace("»¿", ""));
        }


      } else {
        Document doc = new Document();
        for (int i = 0; i < fields.size() - 1; i++) {
          doc.add(new TextField(fields.get(i), values[i], Field.Store.YES));
        }
        w.addDocument(doc);
      }
      counter++;
      if (counter % 10000 == 0) {
        w.commit();
        System.out.println(counter + " .........committed to index..............");
      }

    }

  }
}