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/*
 * Copyright 2018-2020 the original author or authors.
 *
 * Licensed 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 dev.miku.r2dbc.mysql.codec;

import dev.miku.r2dbc.mysql.constant.DataTypes;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.util.annotation.Nullable;

/**
 * Base class considers LOB types (i.e. BLOB, CLOB) for {@link AbstractParameter} implementations.
 */
abstract class AbstractLobParameter extends AbstractParameter {

    private static final Logger logger = LoggerFactory.getLogger(AbstractLobParameter.class);

    @Override
    public final short getType() {
        // Clob (i.e. TEXT) is also BLOB with character collation.
        return DataTypes.LONG_BLOB;
    }

    @Override
    public final void dispose() {
        try {
            Publisher discard = getDiscard();

            if (discard == null) {
                return;
            }

            if (discard instanceof Mono) {
                ((Mono) discard).subscribe(null, e -> logger.error("Exception happened in LOB type cancel binding", e));
            } else {
                Flux.from(discard).subscribe(null, e -> logger.error("Exception happened in LOB type cancel binding", e));
            }
        } catch (Exception e) {
            logger.error("Exception happened in LOB type cancel binding", e);
        }
    }

    @Nullable
    abstract protected Publisher getDiscard();
}