package org.apache.lucene.analysis.miscellaneous;

/*
 * 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 org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.TestUtil;

public class TestLimitTokenCountAnalyzer extends BaseTokenStreamTestCase {

  public void testLimitTokenCountAnalyzer() throws IOException {
    for (boolean consumeAll : new boolean[] { true, false }) {
      MockAnalyzer mock = new MockAnalyzer(random());

      // if we are consuming all tokens, we can use the checks, 
      // otherwise we can't
      mock.setEnableChecks(consumeAll);
      Analyzer a = new LimitTokenCountAnalyzer(mock, 2, consumeAll);
    
      // dont use assertAnalyzesTo here, as the end offset is not the end of the string (unless consumeAll is true, in which case its correct)!
      assertTokenStreamContents(a.tokenStream("dummy", "1  2     3  4  5"), new String[] { "1", "2" }, new int[] { 0, 3 }, new int[] { 1, 4 }, consumeAll ? 16 : null);
      assertTokenStreamContents(a.tokenStream("dummy", "1 2 3 4 5"), new String[] { "1", "2" }, new int[] { 0, 2 }, new int[] { 1, 3 }, consumeAll ? 9 : null);
      
      // less than the limit, ensure we behave correctly
      assertTokenStreamContents(a.tokenStream("dummy", "1  "), new String[] { "1" }, new int[] { 0 }, new int[] { 1 }, consumeAll ? 3 : null);
    
      // equal to limit
      assertTokenStreamContents(a.tokenStream("dummy", "1  2  "), new String[] { "1", "2" }, new int[] { 0, 3 }, new int[] { 1, 4 }, consumeAll ? 6 : null);
    }
  }

  public void testLimitTokenCountIndexWriter() throws IOException {
    
    for (boolean consumeAll : new boolean[] { true, false }) {
      Directory dir = newDirectory();
      int limit = TestUtil.nextInt(random(), 50, 101000);
      MockAnalyzer mock = new MockAnalyzer(random());

      // if we are consuming all tokens, we can use the checks, 
      // otherwise we can't
      mock.setEnableChecks(consumeAll);
      Analyzer a = new LimitTokenCountAnalyzer(mock, limit, consumeAll);

      IndexWriter writer = new IndexWriter(dir, new IndexWriterConfig
                                           (TEST_VERSION_CURRENT, a));

      Document doc = new Document();
      StringBuilder b = new StringBuilder();
      for(int i=1;i<limit;i++)
        b.append(" a");
      b.append(" x");
      b.append(" z");
      doc.add(newTextField("field", b.toString(), Field.Store.NO));
      writer.addDocument(doc);
      writer.close();
      
      IndexReader reader = DirectoryReader.open(dir);
      Term t = new Term("field", "x");
      assertEquals(1, reader.docFreq(t));
      t = new Term("field", "z");
      assertEquals(0, reader.docFreq(t));
      reader.close();
      dir.close();
    }
  }

}
