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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.apache.kafka.connect.converters;

import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.utils.AppInfoParser;
import org.apache.kafka.connect.components.Versioned;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.SchemaAndValue;
import org.apache.kafka.connect.errors.DataException;
import org.apache.kafka.connect.storage.Converter;
import org.apache.kafka.connect.storage.ConverterConfig;
import org.apache.kafka.connect.storage.HeaderConverter;

import java.nio.ByteBuffer;
import java.util.Map;

/**
 * Pass-through converter for raw byte data.
 * 
 * This implementation currently does nothing with the topic names or header keys.
 */
public class ByteArrayConverter implements Converter, HeaderConverter, Versioned {

    private static final ConfigDef CONFIG_DEF = ConverterConfig.newConfigDef();
    @Override
    public String version() {
        return AppInfoParser.getVersion();
    }
    @Override
    public ConfigDef config() {
        return CONFIG_DEF;
    }

    @Override
    public void configure(Map configs) {
    }

    @Override
    public void configure(Map configs, boolean isKey) {
    }

    @Override
    public byte[] fromConnectData(String topic, Schema schema, Object value) {
        if (schema != null && schema.type() != Schema.Type.BYTES)
            throw new DataException("Invalid schema type for ByteArrayConverter: " + schema.type().toString());

        if (value != null && !(value instanceof byte[]) && !(value instanceof ByteBuffer))
            throw new DataException("ByteArrayConverter is not compatible with objects of type " + value.getClass());

        return value instanceof ByteBuffer ? getBytesFromByteBuffer((ByteBuffer) value) : (byte[]) value;
    }

    @Override
    public SchemaAndValue toConnectData(String topic, byte[] value) {
        return new SchemaAndValue(Schema.OPTIONAL_BYTES_SCHEMA, value);
    }

    @Override
    public byte[] fromConnectHeader(String topic, String headerKey, Schema schema, Object value) {
        return fromConnectData(topic, schema, value);
    }

    @Override
    public SchemaAndValue toConnectHeader(String topic, String headerKey, byte[] value) {
        return toConnectData(topic, value);
    }

    @Override
    public void close() {
        // do nothing
    }

    private byte[] getBytesFromByteBuffer(ByteBuffer byteBuffer) {
        if (byteBuffer == null) {
            return null;
        }

        byteBuffer.rewind();
        byte[] bytes = new byte[byteBuffer.remaining()];
        byteBuffer.get(bytes);
        return bytes;
    }
}