/*
 * 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;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
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.store.ByteBuffersDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestBayesianMinCompetitiveTies extends LuceneTestCase {

  private static Query constant(String term, float score) {
    return new BoostQuery(new ConstantScoreQuery(new TermQuery(new Term("f", term))), score);
  }

  public void testTopHit() throws Exception {
    try (Directory dir = new ByteBuffersDirectory()) {
      try (IndexWriter w = new IndexWriter(dir, new IndexWriterConfig())) {
        for (int i = 0; i < 1002; i++) {
          Document doc = new Document();
          doc.add(new StringField("f", i < 1000 ? "filler" : i == 1000 ? "a" : "b", Field.Store.NO));
          w.addDocument(doc);
        }
      }
      try (DirectoryReader reader = DirectoryReader.open(dir)) {
        Query inner =
            new BooleanQuery.Builder()
                .add(constant("filler", 1f), BooleanClause.Occur.SHOULD)
                .add(constant("a", 4.999999f), BooleanClause.Occur.SHOULD)
                .add(constant("b", 5.0f), BooleanClause.Occur.SHOULD)
                .build();
        TopDocs top = new IndexSearcher(reader).search(new BayesianScoreQuery(inner, 1f, 0f), 1);
        // expected: doc 1001 "b" (sigmoid(5.0) = 0.9933072), not doc 1000 "a" (0.9933071)
        assertEquals("score=" + top.scoreDocs[0].score, 1001, top.scoreDocs[0].doc);
      }
    }
  }
}