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/*
 * 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.dinky.shaded.paimon.table;

import org.dinky.shaded.paimon.CoreOptions;
import org.dinky.shaded.paimon.KeyValue;
import org.dinky.shaded.paimon.mergetree.compact.DeduplicateMergeFunction;
import org.dinky.shaded.paimon.mergetree.compact.FirstRowMergeFunction;
import org.dinky.shaded.paimon.mergetree.compact.MergeFunctionFactory;
import org.dinky.shaded.paimon.mergetree.compact.PartialUpdateMergeFunction;
import org.dinky.shaded.paimon.mergetree.compact.aggregate.AggregateMergeFunction;
import org.dinky.shaded.paimon.options.Options;
import org.dinky.shaded.paimon.schema.KeyValueFieldsExtractor;
import org.dinky.shaded.paimon.schema.TableSchema;
import org.dinky.shaded.paimon.types.DataField;
import org.dinky.shaded.paimon.types.RowType;

import java.util.List;
import java.util.stream.Collectors;

import static org.dinky.shaded.paimon.schema.SystemColumns.KEY_FIELD_PREFIX;

/** Utils for creating changelog table with primary keys. */
public class PrimaryKeyTableUtils {

    public static RowType addKeyNamePrefix(RowType type) {
        return new RowType(addKeyNamePrefix(type.getFields()));
    }

    public static List addKeyNamePrefix(List keyFields) {
        return keyFields.stream()
                .map(
                        f ->
                                new DataField(
                                        f.id(),
                                        KEY_FIELD_PREFIX + f.name(),
                                        f.type(),
                                        f.description()))
                .collect(Collectors.toList());
    }

    public static MergeFunctionFactory createMergeFunctionFactory(
            TableSchema tableSchema, KeyValueFieldsExtractor extractor) {
        RowType rowType = tableSchema.logicalRowType();
        Options conf = Options.fromMap(tableSchema.options());
        CoreOptions options = new CoreOptions(conf);
        CoreOptions.MergeEngine mergeEngine = options.mergeEngine();

        switch (mergeEngine) {
            case DEDUPLICATE:
                return DeduplicateMergeFunction.factory();
            case PARTIAL_UPDATE:
                return PartialUpdateMergeFunction.factory(conf, rowType, tableSchema.primaryKeys());
            case AGGREGATE:
                return AggregateMergeFunction.factory(
                        conf,
                        tableSchema.fieldNames(),
                        rowType.getFieldTypes(),
                        tableSchema.primaryKeys());
            case FIRST_ROW:
                return FirstRowMergeFunction.factory(
                        new RowType(extractor.keyFields(tableSchema)), rowType, conf);
            default:
                throw new UnsupportedOperationException("Unsupported merge engine: " + mergeEngine);
        }
    }

    static class PrimaryKeyFieldsExtractor implements KeyValueFieldsExtractor {

        private static final long serialVersionUID = 1L;

        static final PrimaryKeyFieldsExtractor EXTRACTOR = new PrimaryKeyFieldsExtractor();

        private PrimaryKeyFieldsExtractor() {}

        @Override
        public List keyFields(TableSchema schema) {
            return addKeyNamePrefix(schema.trimmedPrimaryKeysFields());
        }

        @Override
        public List valueFields(TableSchema schema) {
            return schema.fields();
        }
    }
}