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/*
 * Copyright 2016-2020 Crown Copyright
 *
 * 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 uk.gov.gchq.gaffer.sparkaccumulo.operation.handler.javardd;

import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat;
import org.apache.accumulo.core.client.mapreduce.lib.impl.InputConfigurator;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import scala.Tuple2;

import uk.gov.gchq.gaffer.accumulostore.AccumuloStore;
import uk.gov.gchq.gaffer.accumulostore.inputformat.ElementInputFormat;
import uk.gov.gchq.gaffer.data.element.Element;
import uk.gov.gchq.gaffer.operation.OperationException;
import uk.gov.gchq.gaffer.spark.SparkContextUtil;
import uk.gov.gchq.gaffer.sparkaccumulo.operation.handler.AbstractGetRDDHandler;
import uk.gov.gchq.gaffer.sparkaccumulo.operation.javardd.GetJavaRDDOfElementsInRanges;
import uk.gov.gchq.gaffer.store.Context;
import uk.gov.gchq.gaffer.store.Store;

public class GetJavaRDDOfElementsInRangesHandler extends AbstractGetRDDHandler> {

    @Override
    public JavaRDD doOperation(final GetJavaRDDOfElementsInRanges operation,
                                        final Context context,
                                        final Store store) throws OperationException {
        return doOperation(operation, context, (AccumuloStore) store);
    }

    private JavaRDD doOperation(final GetJavaRDDOfElementsInRanges operation,
                                         final Context context,
                                         final AccumuloStore accumuloStore) throws OperationException {


        final JavaSparkContext sparkContext = JavaSparkContext.fromSparkContext(SparkContextUtil.getSparkSession(context, accumuloStore.getProperties()).sparkContext());
        final Configuration conf = getConfiguration(operation);
        // Use batch scan option when performing seeded operation
        InputConfigurator.setBatchScan(AccumuloInputFormat.class, conf, true);
        addIterators(accumuloStore, conf, context.getUser(), operation);
        addRangesFromPairs(accumuloStore, conf, operation);
        final JavaPairRDD pairRDD = sparkContext.newAPIHadoopRDD(conf,
                ElementInputFormat.class,
                Element.class,
                NullWritable.class);
        final JavaRDD rdd = pairRDD.map(new FirstElement());
        return rdd;
    }

    static class FirstElement implements Function, Element> {

        private static final long serialVersionUID = -4695668644733530293L;

        @Override
        public Element call(final Tuple2 tuple) throws Exception {
            return tuple._1();
        }
    }
}