/*
 * 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.camel.kafkaconnector.sink.elasticsearch.transforms;

import java.util.HashMap;
import java.util.Map;

import org.apache.camel.kafkaconnector.utils.SchemaHelper;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.connect.connector.ConnectRecord;
import org.apache.kafka.connect.transforms.Transformation;
import org.apache.kafka.connect.transforms.util.SimpleConfig;

public class ConnectRecordValueToMapTransformer<R extends ConnectRecord<R>> implements Transformation<R> {
    public static final String FIELD_KEY_CONFIG = "key";

    public static final ConfigDef CONFIG_DEF = new ConfigDef()
            .define(FIELD_KEY_CONFIG, ConfigDef.Type.STRING, null, ConfigDef.Importance.MEDIUM,
                    "Transforms String-based content from Kafka into a map");

    private String key;

    @Override
    public R apply(R r) {
        Map<String, Object> targetMap = new HashMap<>();

        Object value = r.value();

        targetMap.put(key, value);
        return r.newRecord(r.topic(), r.kafkaPartition(), null, r.key(),
                 SchemaHelper.buildSchemaBuilderForType(value), targetMap, r.timestamp());
    }

    @Override
    public ConfigDef config() {
        return CONFIG_DEF;
    }

    @Override
    public void close() {

    }

    @Override
    public void configure(Map<String, ?> map) {
        final SimpleConfig config = new SimpleConfig(CONFIG_DEF, map);

        this.key = config.getString(FIELD_KEY_CONFIG);

        if (this.key == null) {
            throw new ConfigException("The ElasticSearch transformer requires a 'key'");
        }
    }
}
