/*
 * 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.flink.connector.jdbc.dialect;

import org.apache.flink.connector.jdbc.internal.converter.ClickHouseRowConverter;
import org.apache.flink.connector.jdbc.internal.converter.JdbcRowConverter;
import org.apache.flink.table.types.logical.LogicalTypeRoot;
import org.apache.flink.table.types.logical.RowType;

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

/**
 * JDBC dialect for ClickHouse.
 *
 * @author wenmo
 * @since 2021/6/7 21:48
 */
public class ClickHouseDialect extends AbstractDialect {

    private static final long serialVersionUID = 1L;

    private static final int MAX_TIMESTAMP_PRECISION = 6;
    private static final int MIN_TIMESTAMP_PRECISION = 1;

    private static final int MAX_DECIMAL_PRECISION = 65;
    private static final int MIN_DECIMAL_PRECISION = 1;

    @Override
    public boolean canHandle(String url) {
        return url.startsWith("jdbc:clickhouse:");
    }

    @Override
    public JdbcRowConverter getRowConverter(RowType rowType) {
        return new ClickHouseRowConverter(rowType);
    }

    @Override
    public Optional<String> defaultDriverName() {
        return Optional.of("ru.yandex.clickhouse.ClickHouseDriver");
    }

    @Override
    public String quoteIdentifier(String identifier) {
        return "`" + identifier + "`";
    }

    @Override
    public Optional<String> getUpsertStatement(
            String tableName, String[] fieldNames, String[] uniqueKeyFields) {
        return Optional.of(getInsertIntoStatement(tableName, fieldNames));
    }

    @Override
    public String dialectName() {
        return "ClickHouse";
    }

    @Override
    public int maxDecimalPrecision() {
        return MAX_DECIMAL_PRECISION;
    }

    @Override
    public int minDecimalPrecision() {
        return MIN_DECIMAL_PRECISION;
    }

    @Override
    public int maxTimestampPrecision() {
        return MAX_TIMESTAMP_PRECISION;
    }

    @Override
    public int minTimestampPrecision() {
        return MIN_TIMESTAMP_PRECISION;
    }

    @Override
    public List<LogicalTypeRoot> unsupportedTypes() {

        // TODO: We can't convert BINARY data type to
        //  PrimitiveArrayTypeInfo.BYTE_PRIMITIVE_ARRAY_TYPE_INFO in
        // LegacyTypeInfoDataTypeConverter.
        return Arrays.asList(
                LogicalTypeRoot.BINARY,
                LogicalTypeRoot.TIMESTAMP_WITH_LOCAL_TIME_ZONE,
                LogicalTypeRoot.TIMESTAMP_WITH_TIME_ZONE,
                LogicalTypeRoot.INTERVAL_YEAR_MONTH,
                LogicalTypeRoot.INTERVAL_DAY_TIME,
                LogicalTypeRoot.ARRAY,
                LogicalTypeRoot.MULTISET,
                LogicalTypeRoot.MAP,
                LogicalTypeRoot.ROW,
                LogicalTypeRoot.DISTINCT_TYPE,
                LogicalTypeRoot.STRUCTURED_TYPE,
                LogicalTypeRoot.NULL,
                LogicalTypeRoot.RAW,
                LogicalTypeRoot.SYMBOL,
                LogicalTypeRoot.UNRESOLVED);
    }
}
