package org.apache.lucene;

/**
 * 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.
 */

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Random;

import org.apache.lucene.store.*;
import org.apache.lucene.document.*;
import org.apache.lucene.analysis.*;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;
import org.apache.lucene.queryParser.*;
import org.apache.lucene.util.LuceneTestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;

public class TestSearchForDuplicates extends LuceneTestCase {

    /** Main for running test case by itself. */
    public static void main(String args[]) {
        TestRunner.run (new TestSuite(TestSearchForDuplicates.class));
    }



  static final String PRIORITY_FIELD ="priority";
  static final String ID_FIELD ="id";
  static final String HIGH_PRIORITY ="high";
  static final String MED_PRIORITY ="medium";
  static final String LOW_PRIORITY ="low";


  /** This test compares search results when using and not using compound
   *  files.
   *
   *  TODO: There is rudimentary search result validation as well, but it is
   *        simply based on asserting the output observed in the old test case,
   *        without really knowing if the output is correct. Someone needs to
   *        validate this output and make any changes to the checkHits method.
   */
  public void testRun() throws Exception {
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw, true);
      Random random = newRandom();
      doTest(random, pw, false);
      pw.close();
      sw.close();
      String multiFileOutput = sw.getBuffer().toString();
      //System.out.println(multiFileOutput);

      sw = new StringWriter();
      pw = new PrintWriter(sw, true);
      doTest(random, pw, true);
      pw.close();
      sw.close();
      String singleFileOutput = sw.getBuffer().toString();

      assertEquals(multiFileOutput, singleFileOutput);
  }


  private void doTest(Random random, PrintWriter out, boolean useCompoundFiles) throws Exception {
      Directory directory = newDirectory(random);
      Analyzer analyzer = new MockAnalyzer();
      IndexWriterConfig conf = newIndexWriterConfig(random, TEST_VERSION_CURRENT, analyzer);
      LogMergePolicy lmp = (LogMergePolicy) conf.getMergePolicy();
      lmp.setUseCompoundFile(useCompoundFiles);
      lmp.setUseCompoundDocStore(useCompoundFiles);
      IndexWriter writer = new IndexWriter(directory, conf);

      final int MAX_DOCS = 225;

      for (int j = 0; j < MAX_DOCS; j++) {
        Document d = new Document();
        d.add(new Field(PRIORITY_FIELD, HIGH_PRIORITY, Field.Store.YES, Field.Index.ANALYZED));

        // NOTE: this ID_FIELD produces no tokens since
        // MockAnalyzer discards numbers
        d.add(new Field(ID_FIELD, Integer.toString(j), Field.Store.YES, Field.Index.ANALYZED));
        writer.addDocument(d);
      }
      writer.close();

      // try a search without OR
      Searcher searcher = new IndexSearcher(directory, true);

      QueryParser parser = new QueryParser(TEST_VERSION_CURRENT, PRIORITY_FIELD, analyzer);

      Query query = parser.parse(HIGH_PRIORITY);
      out.println("Query: " + query.toString(PRIORITY_FIELD));

      ScoreDoc[] hits = searcher.search(query, null, MAX_DOCS).scoreDocs;
      printHits(out, hits, searcher);
      checkHits(hits, MAX_DOCS, searcher);

      searcher.close();

      // try a new search with OR
      searcher = new IndexSearcher(directory, true);
      hits = null;

      parser = new QueryParser(TEST_VERSION_CURRENT, PRIORITY_FIELD, analyzer);

      query = parser.parse(HIGH_PRIORITY + " OR " + MED_PRIORITY);
      out.println("Query: " + query.toString(PRIORITY_FIELD));

      hits = searcher.search(query, null, MAX_DOCS).scoreDocs;
      printHits(out, hits, searcher);
      checkHits(hits, MAX_DOCS, searcher);

      searcher.close();
      directory.close();
  }


  private void printHits(PrintWriter out, ScoreDoc[] hits, Searcher searcher ) throws IOException {
    out.println(hits.length + " total results\n");
    for (int i = 0 ; i < hits.length; i++) {
      if ( i < 10 || (i > 94 && i < 105) ) {
        Document d = searcher.doc(hits[i].doc);
        out.println(i + " " + d.get(ID_FIELD));
      }
    }
  }

  private void checkHits(ScoreDoc[] hits, int expectedCount, Searcher searcher) throws IOException {
    assertEquals("total results", expectedCount, hits.length);
    for (int i = 0 ; i < hits.length; i++) {
      if ( i < 10 || (i > 94 && i < 105) ) {
      Document d = searcher.doc(hits[i].doc);
        assertEquals("check " + i, String.valueOf(i), d.get(ID_FIELD));
      }
    }
  }

}