/*
 * Copyright (C) 2017 Lightbend Inc. <http://www.lightbend.com/>
 */
import java.io.File

import sbt._
import sbt.Keys._

object Jdk9CompileDirectoriesPlugin extends AutoPlugin {

  val jdkVersion: String = System.getProperty("java.version")
    
  override def trigger = allRequirements

  override lazy val projectSettings = Seq(

    javacOptions in Compile ++= {
      // making sure we're really targeting 1.8
      if (isJDK9) Seq("-target", "1.8", "-source", "1.8", "-Xdoclint:none")
      else Seq("-Xdoclint:none")
    },
    
    unmanagedSourceDirectories in Compile ++= {
      if (isJDK9) {
        println(s"[JDK9] Enabled [...-jdk9-only] directories to be compiled.")
        Seq(
          (sourceDirectory in Compile).value / "java-jdk9-only",
          (sourceDirectory in Compile).value / "scala-jdk9-only"
        )
      } else Seq.empty
    },
    
    unmanagedSourceDirectories in Test ++= {
      if (isJDK9) {
        Seq(
          (sourceDirectory in Test).value / "java-jdk9-only",
          (sourceDirectory in Test).value / "scala-jdk9-only"
        )
      } else Seq.empty
    }
    
  )

  private def isJDK9 = {
    jdkVersion startsWith "9"
  }
}