/**
 * Copyright (C) 2009-2018 Lightbend Inc. <https://www.lightbend.com>
 */

package akka

import akka.TestExtras.Filter.Keys._
import com.typesafe.sbt.MultiJvmPlugin.MultiJvmKeys.multiJvmCreateLogger
import com.typesafe.sbt.{SbtMultiJvm, SbtScalariform}
import com.typesafe.sbt.SbtMultiJvm.MultiJvmKeys._
import com.typesafe.sbt.SbtScalariform.ScalariformKeys
import sbt.{ Def, _ }
import sbt.Keys._
import de.heikoseeberger.sbtheader.HeaderPlugin.autoImport._

object MultiNode extends AutoPlugin {

  // MultiJvm tests can be excluded from normal test target an validatePullRequest
  // with -Dakka.test.multi-in-test=false
  val multiNodeTestInTest: Boolean =
    System.getProperty("akka.test.multi-in-test", "true") == "true"

  object CliOptions {
    val multiNode = CliOption("akka.test.multi-node", false)
    val sbtLogNoFormat = CliOption("sbt.log.noformat", false)

    val hostsFileName = sys.props.get("akka.test.multi-node.hostsFileName").toSeq
    val javaName = sys.props.get("akka.test.multi-node.java").toSeq
    val targetDirName = sys.props.get("akka.test.multi-node.targetDirName").toSeq
  }

  val multiExecuteTests = CliOptions.multiNode.ifTrue(multiNodeExecuteTests in MultiJvm).getOrElse(executeTests in MultiJvm)
  val multiTest = CliOptions.multiNode.ifTrue(multiNodeTest in MultiJvm).getOrElse(test in MultiJvm)

  override def trigger = noTrigger
  override def requires = plugins.JvmPlugin

  override lazy val projectSettings: Seq[Def.Setting[_]] = multiJvmSettings

  private val defaultMultiJvmOptions: Seq[String] = {
    import scala.collection.JavaConverters._
    // multinode.D= and multinode.X= makes it possible to pass arbitrary
    // -D or -X arguments to the forked jvm, e.g.
    // -Dmultinode.Djava.net.preferIPv4Stack=true -Dmultinode.Xmx512m -Dmultinode.XX:MaxPermSize=256M
    // -DMultiJvm.akka.cluster.Stress.nrOfNodes=15
    val MultinodeJvmArgs = "multinode\\.(D|X)(.*)".r
    val knownPrefix = Set("multnode.", "akka.", "MultiJvm.")
    val akkaProperties = System.getProperties.stringPropertyNames.asScala.toList.collect {
      case MultinodeJvmArgs(a, b) ⇒
        val value = System.getProperty("multinode." + a + b)
        "-" + a + b + (if (value == "") "" else "=" + value)
      case key: String if knownPrefix.exists(pre ⇒ key.startsWith(pre)) ⇒ "-D" + key + "=" + System.getProperty(key)
    }

    "-Xmx256m" :: akkaProperties ::: CliOptions.sbtLogNoFormat.ifTrue("-Dakka.test.nocolor=true").toList
  }

  private val multiJvmSettings =
    SbtMultiJvm.multiJvmSettings ++
      inConfig(MultiJvm)(SbtScalariform.configScalariformSettings) ++
      Seq(
        jvmOptions in MultiJvm := defaultMultiJvmOptions,
        compileInputs in (MultiJvm, compile) := ((compileInputs in (MultiJvm, compile)) dependsOn (ScalariformKeys.format in MultiJvm)).value,
        scalacOptions in MultiJvm := (scalacOptions in Test).value,
        logLevel in multiJvmCreateLogger := Level.Debug, //  to see ssh establishment
        multiJvmCreateLogger in MultiJvm := { // to use normal sbt logging infra instead of custom sbt-multijvm-one
          val previous = (multiJvmCreateLogger in MultiJvm).value
          val logger = streams.value.log
          (name: String) =>
            new Logger {
              def trace(t: => Throwable): Unit = { logger.trace(t) }
              def success(message: => String): Unit = { success(message) }
              def log(level: Level.Value, message: => String): Unit =
                logger.log(level, s"[${scala.Console.BLUE}$name${scala.Console.RESET}] $message")
            }
        }
      ) ++
        CliOptions.hostsFileName.map(multiNodeHostsFileName in MultiJvm := _) ++
        CliOptions.javaName.map(multiNodeJavaName in MultiJvm := _) ++
        CliOptions.targetDirName.map(multiNodeTargetDirName in MultiJvm := _) ++
        (if (multiNodeTestInTest) {
          // make sure that MultiJvm tests are executed by the default test target,
          // and combine the results from ordinary test and multi-jvm tests
          (executeTests in Test) := {
            val testResults = (executeTests in Test).value
            val multiNodeResults = multiExecuteTests.value
            val overall =
              if (testResults.overall.id < multiNodeResults.overall.id)
                multiNodeResults.overall
              else
                testResults.overall

            Tests.Output(
              overall,
              testResults.events ++ multiNodeResults.events,
              testResults.summaries ++ multiNodeResults.summaries)
          }
        } else Nil) ++
     Def.settings((compile in MultiJvm) := {
      (headerCreate in MultiJvm).value
      (compile in MultiJvm).value
    }) ++ headerSettings(MultiJvm) ++ Seq(
      // only works if I put it here ¯\_(ツ)_/¯
      compile in MultiJvm := ((compile in MultiJvm).triggeredBy(compile in Test)).value
    )


  implicit class TestResultOps(val self: TestResult) extends AnyVal {
    def id: Int = self match {
      case TestResult.Passed ⇒ 0
      case TestResult.Failed ⇒ 1
      case TestResult.Error  ⇒ 2
    }
  }
}

/**
 * Additional settings for scalatest.
 */
object MultiNodeScalaTest extends AutoPlugin {

  override def requires = MultiNode

  override lazy val projectSettings = Seq(
    extraOptions in MultiJvm := {
      val src = (sourceDirectory in MultiJvm).value
      (name: String) ⇒ (src ** (name + ".conf")).get.headOption.map("-Dakka.config=" + _.absolutePath).toSeq
    },
    scalatestOptions in MultiJvm := {
      Seq("-C", "org.scalatest.extra.QuietReporter") ++
        (if (excludeTestTags.value.isEmpty) Seq.empty else Seq("-l", if (MultiNode.CliOptions.multiNode.get) excludeTestTags.value.mkString("\"", " ", "\"") else excludeTestTags.value.mkString(" "))) ++
        (if (onlyTestTags.value.isEmpty) Seq.empty else Seq("-n", if (MultiNode.CliOptions.multiNode.get) onlyTestTags.value.mkString("\"", " ", "\"") else onlyTestTags.value.mkString(" ")))
    })
}
