package eu.dnetlib.dhp.oa.graph.resolution


import com.fasterxml.jackson.databind.ObjectMapper
import eu.dnetlib.dhp.schema.common.EntityType
import eu.dnetlib.dhp.schema.oaf.utils.OafMapperUtils
import eu.dnetlib.dhp.schema.oaf.{Result, StructuredProperty}
import org.apache.commons.io.FileUtils
import org.apache.spark.SparkConf
import org.apache.spark.sql._
import org.junit.jupiter.api.Assertions._
import org.junit.jupiter.api.TestInstance.Lifecycle
import org.junit.jupiter.api.{AfterAll, BeforeAll, Test, TestInstance}

import java.nio.file.{Files, Path}
import scala.collection.JavaConverters._
import scala.io.Source

@TestInstance(Lifecycle.PER_CLASS)
class ResolveEntitiesTest extends Serializable {

  var workingDir:Path = null

  val FAKE_TITLE = "FAKETITLE"
  val FAKE_SUBJECT = "FAKESUBJECT"

  var sparkSession:Option[SparkSession] = None


  @BeforeAll
  def setUp() :Unit = {
    workingDir = Files.createTempDirectory(getClass.getSimpleName)

    val conf = new SparkConf()
    sparkSession = Some(SparkSession
      .builder()
      .config(conf)
      .appName(getClass.getSimpleName)
      .master("local[*]").getOrCreate())
    populateDatasets(sparkSession.get)
    generateUpdates(sparkSession.get)

  }


  @AfterAll
  def tearDown():Unit = {
    FileUtils.deleteDirectory(workingDir.toFile)
    sparkSession.get.stop()


  }




  def generateUpdates(spark:SparkSession):Unit = {
    val template = Source.fromInputStream(this.getClass.getResourceAsStream("updates")).mkString


    val pids:List[String] = template.lines.map{id =>
      val r = new Result
      r.setId(id.toLowerCase.trim)
      r.setSubject(List(OafMapperUtils.structuredProperty(FAKE_SUBJECT, OafMapperUtils.qualifier("fos","fosCS", "fossSchema", "fossiFIgo"), null)).asJava)
      r.setTitle(List(OafMapperUtils.structuredProperty(FAKE_TITLE, OafMapperUtils.qualifier("fos","fosCS", "fossSchema", "fossiFIgo"), null)).asJava)
      r
    }.map{r =>
      val mapper = new ObjectMapper()

      mapper.writeValueAsString(r)}.toList


    val sc =spark.sparkContext

    println(sc.parallelize(pids).count())

    spark.createDataset(sc.parallelize(pids))(Encoders.STRING).write.mode(SaveMode.Overwrite).option("compression", "gzip").text(s"$workingDir/updates")





    import spark.implicits._
    implicit val resEncoder: Encoder[Result] = Encoders.bean(classOf[Result])
    val ds = spark.read.text(s"$workingDir/updates").as[String].map{s => val mapper = new ObjectMapper()
     mapper.readValue(s, classOf[Result])}.collect()




    assertEquals(4, ds.length)
    ds.foreach{r => assertNotNull(r.getSubject)}
    ds.foreach{r => assertEquals(1,r.getSubject.size())}
    ds.foreach{r => assertNotNull(r.getTitle)}
    ds.foreach{r => assertEquals(1,r.getTitle.size())}



    ds.flatMap(r => r.getTitle.asScala.map(t => t.getValue)).foreach(t => assertEquals(FAKE_TITLE,t))
    ds.flatMap(r => r.getSubject.asScala.map(t => t.getValue)).foreach(t => assertEquals(FAKE_SUBJECT,t))

    println("generated Updates")
  }


  def populateDatasets(spark:SparkSession):Unit = {
    import spark.implicits._
    val entities =SparkResolveEntities.entities

    entities.foreach{
      e =>
        val template = Source.fromInputStream(this.getClass.getResourceAsStream(s"$e")).mkString
        spark.createDataset(spark.sparkContext.parallelize(template.lines.toList)).as[String].write.option("compression", "gzip").text(s"$workingDir/graph/$e")
        println(s"Created Dataset $e")
    }
    SparkResolveRelation.extractPidResolvedTableFromJsonRDD(spark, s"$workingDir/graph", s"$workingDir/work")

  }


  @Test
  def testResolution():Unit = {
    val spark:SparkSession = sparkSession.get
    implicit val resEncoder: Encoder[Result] = Encoders.kryo(classOf[Result])
    SparkResolveEntities.resolveEntities(spark,s"$workingDir/work", s"$workingDir/updates" )

    val ds = spark.read.load(s"$workingDir/work/resolvedEntities").as[Result]

    assertEquals(3, ds.count())

    ds.collect().foreach{
      r =>
      assertTrue(r.getId.startsWith("50"))
    }
  }




  private def structuredPContainsValue(l:java.util.List[StructuredProperty], exptectedValue:String):Boolean = {
    l.asScala.exists(p =>p.getValue!= null && p.getValue.equalsIgnoreCase(exptectedValue))
  }

  @Test
  def testUpdate():Unit = {
    val spark:SparkSession = sparkSession.get
    import spark.implicits._
    implicit val resEncoder: Encoder[Result] = Encoders.kryo(classOf[Result])
    val m = new ObjectMapper()
    SparkResolveEntities.resolveEntities(spark,s"$workingDir/work", s"$workingDir/updates" )
    SparkResolveEntities.generateResolvedEntities(spark,s"$workingDir/work",s"$workingDir/graph" )




    val pubDS:Dataset[Result] = spark.read.text(s"$workingDir/work/resolvedGraph/publication").as[String].map(s => SparkResolveEntities.deserializeObject(s, EntityType.publication))
    val t  = pubDS.filter(p => p.getTitle!=null && p.getSubject!=null).filter(p => p.getTitle.asScala.exists(t => t.getValue.equalsIgnoreCase("FAKETITLE"))).count()



    val datDS:Dataset[Result] = spark.read.text(s"$workingDir/work/resolvedGraph/dataset").as[String].map(s => SparkResolveEntities.deserializeObject(s, EntityType.dataset))

    val td  = datDS.filter(p => p.getTitle!=null && p.getSubject!=null).filter(p => p.getTitle.asScala.exists(t => t.getValue.equalsIgnoreCase("FAKETITLE"))).count()


    val softDS:Dataset[Result] = spark.read.text(s"$workingDir/work/resolvedGraph/software").as[String].map(s => SparkResolveEntities.deserializeObject(s, EntityType.software))
    val ts  = softDS.filter(p => p.getTitle!=null && p.getSubject!=null).filter(p => p.getTitle.asScala.exists(t => t.getValue.equalsIgnoreCase("FAKETITLE"))).count()


    val orpDS:Dataset[Result] = spark.read.text(s"$workingDir/work/resolvedGraph/otherresearchproduct").as[String].map(s => SparkResolveEntities.deserializeObject(s, EntityType.otherresearchproduct))
    val to  = orpDS.filter(p => p.getTitle!=null && p.getSubject!=null).filter(p => p.getTitle.asScala.exists(t => t.getValue.equalsIgnoreCase("FAKETITLE"))).count()


    assertEquals(0, t)
    assertEquals(2, td)
    assertEquals(1, ts)
    assertEquals(0, to)

  }











}