/*
 * 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.queries.spans;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexOptions;
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.MatchesIterator;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreMode;
import org.apache.lucene.search.Weight;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestSpanWithinMatchesOffsets extends LuceneTestCase {

  public void testMatchOffsetsAreThoseOfTheContainedSpan() throws Exception {
    FieldType withOffsets = new FieldType(TextField.TYPE_NOT_STORED);
    withOffsets.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS);
    try (Directory dir = new ByteBuffersDirectory()) {
      try (IndexWriter w = new IndexWriter(dir, new IndexWriterConfig())) {
        Document doc = new Document();
        doc.add(new Field("f", "ab ac bc", withOffsets));
        w.addDocument(doc);
      }
      try (DirectoryReader reader = DirectoryReader.open(dir)) {
        IndexSearcher searcher = new IndexSearcher(reader);
        SpanQuery big =
            new SpanNearQuery(
                new SpanQuery[] {
                  new SpanTermQuery(new Term("f", "ab")), new SpanTermQuery(new Term("f", "bc"))
                },
                1,
                true);
        Query query = new SpanWithinQuery(big, new SpanTermQuery(new Term("f", "ac")));
        Weight weight =
            searcher.createWeight(searcher.rewrite(query), ScoreMode.COMPLETE_NO_SCORES, 1f);
        MatchesIterator it = weight.matches(reader.leaves().get(0), 0).getMatches("f");
        assertTrue(it.next());
        // the match is "ac" at position 1, offsets [3,5): expected startOffset 3, actual 0 (that of the enclosing "ab")
        assertEquals(3, it.startOffset());
      }
    }
  }
}