package eu.dnetlib.dhp.oa.graph.dump.eosc;

import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;

import java.io.Serializable;
import java.util.Optional;

import org.apache.commons.io.IOUtils;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.function.FilterFunction;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.sql.Encoders;
import org.apache.spark.sql.SaveMode;
import org.apache.spark.sql.SparkSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.eosc.model.EoscResult;
import eu.dnetlib.dhp.oa.graph.dump.Constants;
import eu.dnetlib.dhp.oa.graph.dump.ResultMapper;
import eu.dnetlib.dhp.oa.graph.dump.Utils;
import eu.dnetlib.dhp.oa.model.graph.GraphResult;
import eu.dnetlib.dhp.schema.oaf.Result;

/**
 * @author miriam.baglioni
 * @Date 27/07/22
 */
public class SelectEoscResultsJobStep1 implements Serializable {
	private static final Logger log = LoggerFactory.getLogger(SelectEoscResultsJobStep1.class);

	public static void main(String[] args) throws Exception {
		String jsonConfiguration = IOUtils
			.toString(
				SelectEoscResultsJobStep1.class
					.getResourceAsStream(
						"/eu/dnetlib/dhp/oa/graph/dump/eosc_select_result_parameters.json"));

		final ArgumentApplicationParser parser = new ArgumentApplicationParser(jsonConfiguration);
		parser.parseArgument(args);

		Boolean isSparkSessionManaged = Optional
			.ofNullable(parser.get("isSparkSessionManaged"))
			.map(Boolean::valueOf)
			.orElse(Boolean.TRUE);
		log.info("isSparkSessionManaged: {}", isSparkSessionManaged);

		final String inputPath = parser.get("sourcePath");
		log.info("inputPath: {}", inputPath);

		final String outputPath = parser.get("outputPath");
		log.info("outputPath: {}", outputPath);

		final String resultClassName = parser.get("resultTableName");
		log.info("resultTableName: {}", resultClassName);

		Class<? extends Result> inputClazz = (Class<? extends Result>) Class.forName(resultClassName);

		SparkConf conf = new SparkConf();

		runWithSparkSession(
			conf,
			isSparkSessionManaged,
			spark -> {
				Utils.removeOutputDir(spark, outputPath);
				selectEoscResults(spark, inputPath, outputPath, inputClazz);
			});
	}

	private static <R extends Result> void selectEoscResults(SparkSession spark, String inputPath, String outputPath,
		Class<R> inputClazz) {
		Utils
			.readPath(spark, inputPath, inputClazz)
			.filter(
				(FilterFunction<R>) r -> !r.getDataInfo().getDeletedbyinference() && !r.getDataInfo().getInvisible()
					&& r.getContext().stream().anyMatch(c -> c.getId().equals("eosc")))
			.map(
				(MapFunction<R, EoscResult>) r -> (EoscResult) ResultMapper
					.map(r, null, Constants.DUMPTYPE.EOSC.getType()),
				Encoders.bean(EoscResult.class))
			.write()
			.mode(SaveMode.Overwrite)
			.option("compression", "gzip")
			.json(outputPath);
	}

}