package eu.dnetlib.dhp.projecttoresult;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

import org.apache.commons.io.FileUtils;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.FilterFunction;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Encoders;
import org.apache.spark.sql.SparkSession;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;

import eu.dnetlib.dhp.schema.oaf.Relation;

public class ProjectPropagationJobTest {

	private static final Logger log = LoggerFactory.getLogger(ProjectPropagationJobTest.class);

	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

	private static SparkSession spark;

	private static Path workingDir;
	private static final SparkConf conf = new SparkConf();

	@BeforeAll
	public static void beforeAll() throws IOException {

		log.info("using work dir {}", workingDir);


		conf.setAppName(ProjectPropagationJobTest.class.getSimpleName());

		conf.setMaster("local[*]");
		conf.set("spark.driver.host", "localhost");
		conf.set("hive.metastore.local", "true");
		conf.set("spark.ui.enabled", "false");


		spark = SparkSession
				.builder()
				.appName(ProjectPropagationJobTest.class.getSimpleName())
				.config(conf)
				.getOrCreate();
	}

	@AfterAll
	public static void afterAll() throws IOException {

		spark.stop();
	}

	/**
	 * There are no new relations to be added. All the possible relations have already been linked with the project in
	 * the graph
	 *
	 * @throws Exception
	 */
	@Test
	void NoUpdateTest() throws Exception {

		workingDir = Files.createTempDirectory(ProjectPropagationJobTest.class.getSimpleName());
		final String potentialUpdateDate = getClass()
			.getResource(
				"/eu/dnetlib/dhp/projecttoresult/preparedInfo/noupdates/potentialUpdates")
			.getPath();
		final String alreadyLinkedPath = getClass()
			.getResource(
				"/eu/dnetlib/dhp/projecttoresult/preparedInfo/alreadyLinked")
			.getPath();
		SparkResultToProjectThroughSemRelJob
			.main(
				new String[] {

					"-isSparkSessionManaged", Boolean.FALSE.toString(),
					"-hive_metastore_uris", "",
					
					"-outputPath", workingDir.toString() + "/relation",
					"-potentialUpdatePath", potentialUpdateDate,
					"-alreadyLinkedPath", alreadyLinkedPath,
				});

		final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());

		JavaRDD<Relation> tmp = sc
			.textFile(workingDir.toString() + "/relation")
			.map(item -> OBJECT_MAPPER.readValue(item, Relation.class));

		Assertions.assertEquals(0, tmp.count());

		FileUtils.deleteDirectory(workingDir.toFile());


	}

	/**
	 * All the possible updates will produce a new relation. No relations are already linked in the grpha
	 *
	 * @throws Exception
	 */
	@Test
	void UpdateTenTest() throws Exception {
		workingDir = Files.createTempDirectory(ProjectPropagationJobTest.class.getSimpleName());
		spark = SparkSession
				.builder()
				.appName(ProjectPropagationJobTest.class.getSimpleName())
				.config(conf)
				.getOrCreate();
		final String potentialUpdatePath = getClass()
			.getResource(
				"/eu/dnetlib/dhp/projecttoresult/preparedInfo/tenupdates/potentialUpdates")
			.getPath();
		final String alreadyLinkedPath = getClass()
			.getResource(
				"/eu/dnetlib/dhp/projecttoresult/preparedInfo/alreadyLinked")
			.getPath();
		SparkResultToProjectThroughSemRelJob
			.main(
				new String[] {

					"-isSparkSessionManaged", Boolean.FALSE.toString(),
					"-hive_metastore_uris", "",

					"-outputPath", workingDir.toString() + "/relation",
					"-potentialUpdatePath", potentialUpdatePath,
					"-alreadyLinkedPath", alreadyLinkedPath,
				});

		final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());

		JavaRDD<Relation> tmp = sc
			.textFile(workingDir.toString() + "/relation")
			.map(item -> OBJECT_MAPPER.readValue(item, Relation.class));

		// got 20 new relations because "produces" and "isProducedBy" are added
		Assertions.assertEquals(10, tmp.count());

		Dataset<Relation> verificationDs = spark.createDataset(tmp.rdd(), Encoders.bean(Relation.class));

		Assertions.assertEquals(5, verificationDs.filter("relClass = 'produces'").count());
		Assertions.assertEquals(5, verificationDs.filter("relClass = 'isProducedBy'").count());

		Assertions
			.assertEquals(
				5,
				verificationDs
					.filter(
						(FilterFunction<Relation>) r -> r.getSource().startsWith("50")
							&& r.getTarget().startsWith("40")
							&& r.getRelClass().equals("isProducedBy"))
					.count());
		Assertions
			.assertEquals(
				5,
				verificationDs
					.filter(
						(FilterFunction<Relation>) r -> r.getSource().startsWith("40")
							&& r.getTarget().startsWith("50")
							&& r.getRelClass().equals("produces"))
					.count());

		verificationDs.createOrReplaceTempView("temporary");

		Assertions
			.assertEquals(
				10,
				spark
					.sql(
						"Select * from temporary where datainfo.inferenceprovenance = 'propagation'")
					.count());

		FileUtils.deleteDirectory(workingDir.toFile());

	}

	/**
	 * One of the relations in the possible updates is already linked to the project in the graph. All the others are
	 * not. There will be 9 new associations leading to 18 new relations
	 *
	 * @throws Exception
	 */
	@Test
	void UpdateMixTest() throws Exception {
		workingDir = Files.createTempDirectory(ProjectPropagationJobTest.class.getSimpleName());
		spark = SparkSession
				.builder()
				.appName(ProjectPropagationJobTest.class.getSimpleName())
				.config(conf)
				.getOrCreate();
		final String potentialUpdatepath = getClass()
			.getResource(
				"/eu/dnetlib/dhp/projecttoresult/preparedInfo/updatesmixed/potentialUpdates")
			.getPath();
		final String alreadyLinkedPath = getClass()
			.getResource(
				"/eu/dnetlib/dhp/projecttoresult/preparedInfo/alreadyLinked")
			.getPath();
		SparkResultToProjectThroughSemRelJob
			.main(
				new String[] {

					"-isSparkSessionManaged", Boolean.FALSE.toString(),
					"-hive_metastore_uris", "",

					"-outputPath", workingDir.toString() + "/relation",
					"-potentialUpdatePath", potentialUpdatepath,
					"-alreadyLinkedPath", alreadyLinkedPath,
				});

		final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());

		JavaRDD<Relation> tmp = sc
			.textFile(workingDir.toString() + "/relation")
			.map(item -> OBJECT_MAPPER.readValue(item, Relation.class));

		// JavaRDD<Relation> tmp = sc.textFile("/tmp/relation")
		// .map(item -> OBJECT_MAPPER.readValue(item, Relation.class));

		// got 20 new relations because "produces" and "isProducedBy" are added
		Assertions.assertEquals(8, tmp.count());

		Dataset<Relation> verificationDs = spark.createDataset(tmp.rdd(), Encoders.bean(Relation.class));

		Assertions.assertEquals(4, verificationDs.filter("relClass = 'produces'").count());
		Assertions.assertEquals(4, verificationDs.filter("relClass = 'isProducedBy'").count());

		Assertions
			.assertEquals(
				4,
				verificationDs
					.filter(
						(FilterFunction<Relation>) r -> r.getSource().startsWith("50")
							&& r.getTarget().startsWith("40")
							&& r.getRelClass().equals("isProducedBy"))
					.count());
		Assertions
			.assertEquals(
				4,
				verificationDs
					.filter(
						(FilterFunction<Relation>) r -> r.getSource().startsWith("40")
							&& r.getTarget().startsWith("50")
							&& r.getRelClass().equals("produces"))
					.count());

		verificationDs.createOrReplaceTempView("temporary");

		Assertions
			.assertEquals(
				8,
				spark
					.sql(
						"Select * from temporary where datainfo.inferenceprovenance = 'propagation'")
					.count());

		FileUtils.deleteDirectory(workingDir.toFile());
	}
}