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

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

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.sql.SaveMode;
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.dump.oaf.graph.Project;

public class ProjectSubsetTest {
	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
	private static SparkSession spark;
	private static Path workingDir;
	private static final Logger log = LoggerFactory
		.getLogger(eu.dnetlib.dhp.oa.graph.dump.projectssubset.ProjectSubsetTest.class);

	@BeforeAll
	public static void beforeAll() throws IOException {
		workingDir = Files
			.createTempDirectory(
				eu.dnetlib.dhp.oa.graph.dump.projectssubset.ProjectSubsetTest.class.getSimpleName());
		log.info("using work dir {}", workingDir);
		SparkConf conf = new SparkConf();
		conf.setAppName(eu.dnetlib.dhp.oa.graph.dump.projectssubset.ProjectSubsetTest.class.getSimpleName());
		conf.setMaster("local[*]");
		conf.set("spark.driver.host", "localhost");
		conf.set("hive.metastore.local", "true");
		conf.set("spark.ui.enabled", "false");
		conf.set("spark.sql.warehouse.dir", workingDir.toString());
		conf.set("hive.metastore.warehouse.dir", workingDir.resolve("warehouse").toString());
		spark = SparkSession
			.builder()
			.appName(eu.dnetlib.dhp.oa.graph.dump.projectssubset.ProjectSubsetTest.class.getSimpleName())
			.config(conf)
			.getOrCreate();
	}

	@AfterAll
	public static void afterAll() throws IOException {
		FileUtils.deleteDirectory(workingDir.toFile());
		spark.stop();
	}

	@Test
	void testAllNew() throws Exception {
		final String projectListPath = getClass()
			.getResource("/eu/dnetlib/dhp/oa/graph/dump/projectsubset/projectId")
			.getPath();
		final String sourcePath = getClass()
			.getResource("/eu/dnetlib/dhp/oa/graph/dump/projectsubset/allnew/projects")
			.getPath();
		spark
			.read()
			.textFile(projectListPath)
			.write()
			.mode(SaveMode.Overwrite)
			.text(workingDir.toString() + "/projectIds");
		ProjectsSubsetSparkJob.main(new String[] {
			"-isSparkSessionManaged", Boolean.FALSE.toString(),
			"-outputPath", workingDir.toString() + "/projects",
			"-sourcePath", sourcePath,
			"-projectListPath", workingDir.toString() + "/projectIds"
		});
		final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());
		JavaRDD<Project> tmp = sc
			.textFile(workingDir.toString() + "/projects")
			.map(item -> OBJECT_MAPPER.readValue(item, Project.class));
		Assertions.assertEquals(12, tmp.count());
		Assertions.assertEquals(2, tmp.filter(p -> p.getId().substring(3, 15).equals("aka_________")).count());
		Assertions.assertEquals(2, tmp.filter(p -> p.getId().substring(3, 15).equals("anr_________")).count());
		Assertions.assertEquals(4, tmp.filter(p -> p.getId().substring(3, 15).equals("arc_________")).count());
		Assertions.assertEquals(3, tmp.filter(p -> p.getId().substring(3, 15).equals("conicytf____")).count());
		Assertions.assertEquals(1, tmp.filter(p -> p.getId().substring(3, 15).equals("corda_______")).count());
		Assertions.assertEquals(40, sc.textFile(workingDir.toString() + "/projectIds").count());
	}

	@Test
	void testMatchOne() throws Exception {
		final String projectListPath = getClass()
			.getResource("/eu/dnetlib/dhp/oa/graph/dump/projectsubset/projectId")
			.getPath();
		final String sourcePath = getClass()
			.getResource("/eu/dnetlib/dhp/oa/graph/dump/projectsubset/matchOne/projects")
			.getPath();
		spark
			.read()
			.textFile(projectListPath)
			.write()
			.mode(SaveMode.Overwrite)
			.text(workingDir.toString() + "/projectIds");
		ProjectsSubsetSparkJob.main(new String[] {
			"-isSparkSessionManaged", Boolean.FALSE.toString(),
			"-outputPath", workingDir.toString() + "/projects",
			"-sourcePath", sourcePath,
			"-projectListPath", workingDir.toString() + "/projectIds"
		});
		final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());
		JavaRDD<Project> tmp = sc
			.textFile(workingDir.toString() + "/projects")
			.map(item -> OBJECT_MAPPER.readValue(item, Project.class));
		Assertions.assertEquals(11, tmp.count());
		Assertions.assertEquals(2, tmp.filter(p -> p.getId().substring(3, 15).equals("aka_________")).count());
		Assertions.assertEquals(2, tmp.filter(p -> p.getId().substring(3, 15).equals("anr_________")).count());
		Assertions.assertEquals(4, tmp.filter(p -> p.getId().substring(3, 15).equals("arc_________")).count());
		Assertions.assertEquals(3, tmp.filter(p -> p.getId().substring(3, 15).equals("conicytf____")).count());
		Assertions.assertEquals(0, tmp.filter(p -> p.getId().substring(3, 15).equals("corda__h2020")).count());
		Assertions.assertEquals(39, sc.textFile(workingDir.toString() + "/projectIds").count());
	}
}