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

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.MapFunction;
import org.apache.spark.sql.Dataset;
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 com.fasterxml.jackson.databind.ObjectMapper;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.oa.graph.dump.Utils;
import eu.dnetlib.dhp.oa.model.community.CommunityResult;
import scala.Tuple2;

public class SparkUpdateProjectInfo implements Serializable {

	private static final Logger log = LoggerFactory.getLogger(SparkUpdateProjectInfo.class);
	public static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

	public static void main(String[] args) throws Exception {
		String jsonConfiguration = IOUtils
			.toString(
				SparkUpdateProjectInfo.class
					.getResourceAsStream(
						"/eu/dnetlib/dhp/oa/graph/dump/project_input_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 preparedInfoPath = parser.get("preparedInfoPath");
		log.info("preparedInfoPath: {}", preparedInfoPath);

		SparkConf conf = new SparkConf();

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

	private static void extend(
		SparkSession spark,
		String inputPath,
		String outputPath,
		String preparedInfoPath) {
		Dataset<CommunityResult> result = Utils.readPath(spark, inputPath, CommunityResult.class);
		Dataset<ResultProject> resultProject = Utils.readPath(spark, preparedInfoPath, ResultProject.class);
		result
			.joinWith(
				resultProject, result.col("id").equalTo(resultProject.col("resultId")),
				"left")
			.map((MapFunction<Tuple2<CommunityResult, ResultProject>, CommunityResult>) value -> {
				CommunityResult r = value._1();
				Optional.ofNullable(value._2()).ifPresent(rp -> r.setProjects(rp.getProjectsList()));
				return r;
			}, Encoders.bean(CommunityResult.class))
			.write()
			.option("compression", "gzip")
			.mode(SaveMode.Append)
			.json(outputPath);

	}

}