/*
 * 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.mergetree.compact.aggregate.factory;

import org.apache.paimon.CoreOptions;
import org.apache.paimon.mergetree.compact.aggregate.FieldNestedPartialUpdateAgg;
import org.apache.paimon.types.ArrayType;
import org.apache.paimon.types.DataType;
import org.apache.paimon.types.RowType;

import java.util.List;

import static org.apache.paimon.utils.Preconditions.checkArgument;

/** Factory for #{@link FieldNestedPartialUpdateAgg}. */
public class FieldNestedPartialUpdateAggFactory implements FieldAggregatorFactory {

    public static final String NAME = "nested_partial_update";

    @Override
    public FieldNestedPartialUpdateAgg create(
            DataType fieldType, CoreOptions options, String field) {
        return createFieldNestedPartialUpdateAgg(
                fieldType,
                options.fieldNestedUpdateAggNestedKey(field),
                options.fieldNestedUpdateAggNestedKeyNullStrategy(field));
    }

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

    private FieldNestedPartialUpdateAgg createFieldNestedPartialUpdateAgg(
            DataType fieldType,
            List<String> nestedKey,
            CoreOptions.NestedKeyNullStrategy nestedKeyNullStrategy) {
        checkArgument(!nestedKey.isEmpty());
        String typeErrorMsg =
                "Data type for nested table column must be 'Array<Row>' but was '%s'.";
        checkArgument(fieldType instanceof ArrayType, typeErrorMsg, fieldType);
        ArrayType arrayType = (ArrayType) fieldType;
        checkArgument(arrayType.getElementType() instanceof RowType, typeErrorMsg, fieldType);
        return new FieldNestedPartialUpdateAgg(
                identifier(), arrayType, nestedKey, nestedKeyNullStrategy);
    }
}
