/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.index.query;

import org.apache.lucene.queries.spans.SpanFirstQuery;
import org.apache.lucene.search.Query;
import org.opensearch.core.common.ParsingException;
import org.opensearch.common.Strings;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentFactory;
import org.opensearch.test.AbstractQueryTestCase;

import java.io.IOException;

import static org.opensearch.index.query.QueryBuilders.spanTermQuery;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.instanceOf;

public class SpanFirstQueryBuilderTests extends AbstractQueryTestCase<SpanFirstQueryBuilder> {
    @Override
    protected SpanFirstQueryBuilder doCreateTestQueryBuilder() {
        SpanTermQueryBuilder[] spanTermQueries = new SpanTermQueryBuilderTests().createSpanTermQueryBuilders(1);
        return new SpanFirstQueryBuilder(spanTermQueries[0], randomIntBetween(0, 1000));
    }

    @Override
    protected void doAssertLuceneQuery(SpanFirstQueryBuilder queryBuilder, Query query, QueryShardContext context) throws IOException {
        assertThat(query, instanceOf(SpanFirstQuery.class));
    }

    /**
     * test exception on missing `end` and `match` parameter in parser
     */
    public void testParseEnd() throws IOException {
        {
            XContentBuilder builder = XContentFactory.jsonBuilder();
            builder.startObject();
            builder.startObject(SpanFirstQueryBuilder.NAME);
            builder.field("match");
            spanTermQuery("description", "jumped").toXContent(builder, null);
            builder.endObject();
            builder.endObject();

            ParsingException e = expectThrows(ParsingException.class, () -> parseQuery(Strings.toString(builder)));
            assertTrue(e.getMessage().contains("span_first must have [end] set"));
        }
        {
            XContentBuilder builder = XContentFactory.jsonBuilder();
            builder.startObject();
            builder.startObject(SpanFirstQueryBuilder.NAME);
            builder.field("end", 10);
            builder.endObject();
            builder.endObject();

            ParsingException e = expectThrows(ParsingException.class, () -> parseQuery(Strings.toString(builder)));
            assertTrue(e.getMessage().contains("span_first must have [match] span query clause"));
        }
    }

    public void testFromJson() throws IOException {
        String json = "{\n"
            + "  \"span_first\" : {\n"
            + "    \"match\" : {\n"
            + "      \"span_term\" : {\n"
            + "        \"user\" : {\n"
            + "          \"value\" : \"foobar\",\n"
            + "          \"boost\" : 1.0\n"
            + "        }\n"
            + "      }\n"
            + "    },\n"
            + "    \"end\" : 3,\n"
            + "    \"boost\" : 1.0\n"
            + "  }\n"
            + "}";

        SpanFirstQueryBuilder parsed = (SpanFirstQueryBuilder) parseQuery(json);
        checkGeneratedJson(json, parsed);

        assertEquals(json, 3, parsed.end());
        assertEquals(json, "foobar", ((SpanTermQueryBuilder) parsed.innerQuery()).value());
    }

    public void testFromJsonWithNonDefaultBoostInMatchQuery() {
        String json = "{\n"
            + "  \"span_first\" : {\n"
            + "    \"match\" : {\n"
            + "      \"span_term\" : {\n"
            + "        \"user\" : {\n"
            + "          \"value\" : \"foobar\",\n"
            + "          \"boost\" : 2.0\n"
            + "        }\n"
            + "      }\n"
            + "    },\n"
            + "    \"end\" : 3,\n"
            + "    \"boost\" : 1.0\n"
            + "  }\n"
            + "}";

        Exception exception = expectThrows(ParsingException.class, () -> parseQuery(json));
        assertThat(exception.getMessage(), equalTo("span_first [match] as a nested span clause can't have non-default boost value [2.0]"));
    }
}