/*
 * 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.search.uhighlight;

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.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestZeroMaxPassages extends LuceneTestCase {

  public void testZeroMaxPassagesWithMatch() throws Exception {
    StandardAnalyzer analyzer = new StandardAnalyzer();
    try (Directory dir = new ByteBuffersDirectory()) {
      try (IndexWriter w = new IndexWriter(dir, new IndexWriterConfig(analyzer))) {
        Document doc = new Document();
        doc.add(new TextField("body", "alpha beta", Field.Store.YES));
        w.addDocument(doc);
      }
      try (DirectoryReader r = DirectoryReader.open(dir)) {
        IndexSearcher searcher = new IndexSearcher(r);
        Query query = new TermQuery(new Term("body", "alpha"));
        UnifiedHighlighter highlighter = UnifiedHighlighter.builder(searcher, analyzer).build();
        String[] snippets;
        try {
          snippets = highlighter.highlight("body", query, searcher.search(query, 1), 0);
        } catch (IllegalArgumentException e) {
          return; // rejecting maxPassages 0 up front is fine
        } catch (NullPointerException e) {
          throw new AssertionError("maxPassages 0: expected a null snippet, got " + e, e);
        }
        assertNull(snippets[0]);
      }
    }
  }
}