/*
 * 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.paimon.globalindex.testfulltext;

import org.apache.paimon.globalindex.GlobalIndexer;
import org.apache.paimon.globalindex.GlobalIndexerFactory;
import org.apache.paimon.options.Options;
import org.apache.paimon.types.DataField;
import org.apache.paimon.types.VarCharType;

import java.util.List;

/**
 * A test-only {@link GlobalIndexerFactory} for full-text search. Uses brute-force in-memory
 * inverted index, no native dependencies required.
 */
public class TestFullTextGlobalIndexerFactory implements GlobalIndexerFactory {

    public static final String IDENTIFIER = "test-fulltext";

    @Override
    public String identifier() {
        return IDENTIFIER;
    }

    @Override
    public boolean supportsFullTextSearch() {
        return true;
    }

    @Override
    public GlobalIndexer create(DataField field, Options options) {
        return new TestFullTextGlobalIndexer(field.type(), options);
    }

    @Override
    public GlobalIndexer create(
            DataField indexField, List<DataField> extraFields, Options options) {
        // Multi-column support: this brute-force backend indexes a single text column, which may be
        // the primary field or an extra field. Pick the VARCHAR/STRING column among them.
        DataField textField = indexField;
        if (!(textField.type() instanceof VarCharType) && extraFields != null) {
            for (DataField extra : extraFields) {
                if (extra.type() instanceof VarCharType) {
                    textField = extra;
                    break;
                }
            }
        }
        return new TestFullTextGlobalIndexer(textField.type(), options);
    }
}
