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  http://www.apache.org/licenses/LICENSE-2.0

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*/
package org.apache.griffin.measure.step

import com.holdenkarau.spark.testing.DataFrameSuiteBase
import org.scalatest._

import org.apache.griffin.measure.Loggable
import org.apache.griffin.measure.configuration.enums.BatchProcessType
import org.apache.griffin.measure.context.ContextId
import org.apache.griffin.measure.context.DQContext
import org.apache.griffin.measure.step.transform.TransformStep

class TransformStepTest extends FlatSpec with Matchers with DataFrameSuiteBase with Loggable {

  case class DualTransformStep(name: String,
                               duration: Int,
                               rule: String = "",
                               details: Map[String, Any] = Map(),
                               cache: Boolean = false
                              ) extends TransformStep {

    def doExecute(context: DQContext): Boolean = {
      val threadName = Thread.currentThread().getName
      info(s"Step $name started with $threadName")
      Thread.sleep(duration * 1000L)
      info(s"Step $name finished with $threadName")
      true
    }
  }

  private def getDqContext(name: String = "test-context"): DQContext = {
    DQContext(
      ContextId(System.currentTimeMillis),
      name,
      Nil,
      Nil,
      BatchProcessType
    )(spark)
  }

  /**
    * Run transform steps in parallel. Here are the dependencies of transform steps
    *
    * step5
    * |   |---step2
    * |   |   |---step1
    * |   |---step3
    * |   |   |---step1
    * |   |---step4
    *
    * step1 : -->
    * step2 :    --->
    * step3 :    ---->
    * step4 : ->
    * step5 :         -->
    *
    */
  "transform step " should "be run steps in parallel" in {
    val step1 = DualTransformStep("step1", 3)
    val step2 = DualTransformStep("step2", 4)
    step2.parentSteps += step1
    val step3 = DualTransformStep("step3", 5)
    step3.parentSteps += step1
    val step4 = DualTransformStep("step4", 2)
    val step5 = DualTransformStep("step5", 3)
    step5.parentSteps += step2
    step5.parentSteps += step3
    step5.parentSteps += step4

    val context = getDqContext()
    step5.execute(context) should be (true)
  }
}