/*
 * 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 geode.kafka.sink;

import geode.kafka.source.GeodeKafkaSourceTask;
import org.apache.geode.cache.Region;
import org.apache.kafka.connect.sink.SinkRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * A collection of records to put/remove from a region
 */
public class BatchRecords {
    private static final Logger logger = LoggerFactory.getLogger(BatchRecords.class);

    private Map updateMap;
    private Collection removeList;

    public BatchRecords() {
        this(new HashMap(), new ArrayList());
    }

    /** Used for tests**/
    public BatchRecords(Map updateMap, Collection removeList) {
        this.updateMap = updateMap;
        this.removeList = removeList;
    }

    public void addRemoveOperation(SinkRecord record) {
        //if a previous operation added to the update map
        //let's just remove it so we don't do a put and then a remove
        //depending on the order of operations (putAll then removeAll or removeAll or putAll)...
        //...we could remove one of the if statements.
        if (updateMap.containsKey(record.key())) {
            updateMap.remove(record.key());
        } else {
            removeList.add(record.key());
        }
    }

    public void addUpdateOperation(SinkRecord record, boolean nullValuesMeansRemove) {
        //it's assumed the records in are order
        //if so if a previous value was in the remove list
        // let's not remove it at the end of this operation
        if (nullValuesMeansRemove) {
            if (removeList.contains(record.key())) {
                removeList.remove(record.key());
            }
        }
        updateMap.put(record.key(), record.value());
    }


    public void executeOperations(Region region) {
        if (region != null) {
            region.putAll(updateMap);
            region.removeAll(removeList);
        }
        else {
            logger.info("Unable to locate proxy region: " + region);
        }
    }
}