/*
 * 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.index.analysis;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.opensearch.index.mapper.MapperException;
import org.opensearch.index.mapper.TextFieldMapper;
import org.opensearch.test.OpenSearchTestCase;

public class NamedAnalyzerTests extends OpenSearchTestCase {

    public void testCheckAllowedInMode() {
        try (
            NamedAnalyzer testAnalyzer = new NamedAnalyzer(
                "my_analyzer",
                AnalyzerScope.INDEX,
                createAnalyzerWithMode("my_analyzer", AnalysisMode.INDEX_TIME),
                Integer.MIN_VALUE
            )
        ) {
            testAnalyzer.checkAllowedInMode(AnalysisMode.INDEX_TIME);
            MapperException ex = expectThrows(MapperException.class, () -> testAnalyzer.checkAllowedInMode(AnalysisMode.SEARCH_TIME));
            assertEquals(
                "analyzer [my_analyzer] contains filters [my_analyzer] that are not allowed to run in search time mode.",
                ex.getMessage()
            );
            ex = expectThrows(MapperException.class, () -> testAnalyzer.checkAllowedInMode(AnalysisMode.ALL));
            assertEquals("analyzer [my_analyzer] contains filters [my_analyzer] that are not allowed to run in all mode.", ex.getMessage());
        }

        try (
            NamedAnalyzer testAnalyzer = new NamedAnalyzer(
                "my_analyzer",
                AnalyzerScope.INDEX,
                createAnalyzerWithMode("my_analyzer", AnalysisMode.SEARCH_TIME),
                Integer.MIN_VALUE
            )
        ) {
            testAnalyzer.checkAllowedInMode(AnalysisMode.SEARCH_TIME);
            MapperException ex = expectThrows(MapperException.class, () -> testAnalyzer.checkAllowedInMode(AnalysisMode.INDEX_TIME));
            assertEquals(
                "analyzer [my_analyzer] contains filters [my_analyzer] that are not allowed to run in index time mode.",
                ex.getMessage()
            );
            ex = expectThrows(MapperException.class, () -> testAnalyzer.checkAllowedInMode(AnalysisMode.ALL));
            assertEquals("analyzer [my_analyzer] contains filters [my_analyzer] that are not allowed to run in all mode.", ex.getMessage());
        }

        try (
            NamedAnalyzer testAnalyzer = new NamedAnalyzer(
                "my_analyzer",
                AnalyzerScope.INDEX,
                createAnalyzerWithMode("my_analyzer", AnalysisMode.ALL),
                Integer.MIN_VALUE
            )
        ) {
            testAnalyzer.checkAllowedInMode(AnalysisMode.ALL);
            testAnalyzer.checkAllowedInMode(AnalysisMode.INDEX_TIME);
            testAnalyzer.checkAllowedInMode(AnalysisMode.SEARCH_TIME);
        }
    }

    private Analyzer createAnalyzerWithMode(String name, AnalysisMode mode) {
        TokenFilterFactory tokenFilter = new TokenFilterFactory() {

            @Override
            public String name() {
                return name;
            }

            @Override
            public TokenStream create(TokenStream tokenStream) {
                return null;
            }

            @Override
            public AnalysisMode getAnalysisMode() {
                return mode;
            }
        };
        TokenFilterFactory[] tokenfilters = new TokenFilterFactory[] { tokenFilter };
        CharFilterFactory[] charFilters = new CharFilterFactory[0];
        if (mode == AnalysisMode.SEARCH_TIME && randomBoolean()) {
            AnalyzerComponents components = new AnalyzerComponents(null, charFilters, tokenfilters);
            // sometimes also return reloadable custom analyzer
            return new ReloadableCustomAnalyzer(components, TextFieldMapper.Defaults.POSITION_INCREMENT_GAP, -1);
        }
        return new CustomAnalyzer(null, charFilters, tokenfilters);
    }
}