/**
 * Copyright (C) 2009-2017 Lightbend Inc. <http://www.lightbend.com>
 */

package akka

import java.io.{FileInputStream, InputStreamReader}
import java.util.Properties

import akka.TestExtras.JUnitFileReporting
import com.typesafe.sbt.pgp.PgpKeys.publishSigned
import sbt.Keys._
import sbt._
import sbtwhitesource.WhiteSourcePlugin.autoImport.whitesourceIgnore
import scala.collection.breakOut

object AkkaBuild {

  val enableMiMa = true

  val parallelExecutionByDefault = false // TODO: enable this once we're sure it does not break things

  lazy val buildSettings = Dependencies.Versions ++ Seq(
    organization        := "com.typesafe.akka",
    version             := "2.5-SNAPSHOT"
  )

  lazy val rootSettings = parentSettings ++ Release.settings ++
    UnidocRoot.akkaSettings ++
    Protobuf.settings ++ Seq(
      parallelExecution in GlobalScope := System.getProperty("akka.parallelExecution", parallelExecutionByDefault.toString).toBoolean
    )

  val dontPublishSettings = Seq(
    publishSigned := (),
    publish := (),
    publishArtifact in Compile := false,
    whitesourceIgnore := true
  )

  val dontPublishDocsSettings = Seq(
    sources in doc in Compile := List()
  )


  lazy val parentSettings = Seq(
    publishArtifact := false
  ) ++ dontPublishSettings

  lazy val mayChangeSettings = Seq(
    description := """|This module of Akka is marked as
                      |'may change', which means that it is in early
                      |access mode, which also means that it is not covered
                      |by commercial support. An module marked 'may change' doesn't
                      |have to obey the rule of staying binary compatible
                      |between minor releases. Breaking API changes may be
                      |introduced in minor releases without notice as we
                      |refine and simplify based on your feedback. Additionally
                      |such a module may be dropped in major releases
                      |without prior deprecation.
                      |""".stripMargin
  )

  val (mavenLocalResolver, mavenLocalResolverSettings) =
    System.getProperty("akka.build.M2Dir") match {
      case null => (Resolver.mavenLocal, Seq.empty)
      case path =>
        // Maven resolver settings
        val resolver = Resolver.file("user-publish-m2-local", new File(path))
        (resolver, Seq(
          otherResolvers := resolver:: publishTo.value.toList,
          publishM2Configuration := Classpaths.publishConfig(packagedArtifacts.value, None, resolverName = resolver.name, checksums = checksums.in(publishM2).value, logging = ivyLoggingLevel.value, overwrite = true)
        ))
    }

  lazy val resolverSettings = {
    // should we be allowed to use artifacts published to the local maven repository
    if(System.getProperty("akka.build.useLocalMavenResolver", "false").toBoolean)
      Seq(resolvers += mavenLocalResolver)
    else Seq.empty
  } ++ {
    // should we be allowed to use artifacts from sonatype snapshots
    if(System.getProperty("akka.build.useSnapshotSonatypeResolver", "false").toBoolean)
      Seq(resolvers += Resolver.sonatypeRepo("snapshots"))
    else Seq.empty
  } ++ Seq(
    pomIncludeRepository := (_ => false) // do not leak internal repositories during staging
  )

  private def allWarnings: Boolean = System.getProperty("akka.allwarnings", "false").toBoolean

  lazy val defaultSettings = resolverSettings ++
    TestExtras.Filter.settings ++
    Protobuf.settings ++ Seq(
    // compile options
    scalacOptions in Compile ++= Seq("-encoding", "UTF-8", "-target:jvm-1.8", "-feature", "-unchecked", "-Xlog-reflective-calls", "-Xlint"),
    scalacOptions in Compile ++= (if (allWarnings) Seq("-deprecation") else Nil),
    scalacOptions in Test := (scalacOptions in Test).value.filterNot(opt =>
      opt == "-Xlog-reflective-calls" || opt.contains("genjavadoc")),
    // -XDignore.symbol.file suppresses sun.misc.Unsafe warnings
    javacOptions in compile ++= Seq("-encoding", "UTF-8", "-source", "1.8", "-target", "1.8", "-Xlint:unchecked", "-XDignore.symbol.file"),
    javacOptions in compile ++= (if (allWarnings) Seq("-Xlint:deprecation") else Nil),
    javacOptions in doc ++= Seq(),
    incOptions := incOptions.value.withNameHashing(true),

    crossVersion := CrossVersion.binary,

    ivyLoggingLevel in ThisBuild := UpdateLogging.Quiet,

    licenses := Seq(("Apache License, Version 2.0", url("http://www.apache.org/licenses/LICENSE-2.0"))),
    homepage := Some(url("http://akka.io/")),

    apiURL := Some(url(s"http://doc.akka.io/api/akka/${version.value}")),

    initialCommands :=
      """|import language.postfixOps
         |import akka.actor._
         |import ActorDSL._
         |import scala.concurrent._
         |import com.typesafe.config.ConfigFactory
         |import scala.concurrent.duration._
         |import akka.util.Timeout
         |var config = ConfigFactory.parseString("akka.stdout-loglevel=INFO,akka.loglevel=DEBUG,pinned{type=PinnedDispatcher,executor=thread-pool-executor,throughput=1000}")
         |var remoteConfig = ConfigFactory.parseString("akka.remote.netty{port=0,use-dispatcher-for-io=akka.actor.default-dispatcher,execution-pool-size=0},akka.actor.provider=remote").withFallback(config)
         |var system: ActorSystem = null
         |implicit def _system = system
         |def startSystem(remoting: Boolean = false) { system = ActorSystem("repl", if(remoting) remoteConfig else config); println("don’t forget to system.terminate()!") }
         |implicit def ec = system.dispatcher
         |implicit val timeout = Timeout(5 seconds)
         |""".stripMargin,

    /**
     * Test settings
     */
    fork in Test := true,

    // default JVM config for tests
    javaOptions in Test ++= {
      val defaults = Seq(
        // ## core memory settings
        "-XX:+UseG1GC",
        // most tests actually don't really use _that_ much memory (>1g usually)
        // twice used (and then some) keeps G1GC happy - very few or to no full gcs
        "-Xms3g", "-Xmx3g",
        // increase stack size (todo why?)
        "-Xss2m",

        // ## extra memory/gc tuning
        // this breaks jstat, but could avoid costly syncs to disc see http://www.evanjones.ca/jvm-mmap-pause.html
        "-XX:+PerfDisableSharedMem",
        // tell G1GC that we would be really happy if all GC pauses could be kept below this as higher would
        // likely start causing test failures in timing tests
        "-XX:MaxGCPauseMillis=300",
        // nio direct memory limit for artery/aeron (probably)
        "-XX:MaxDirectMemorySize=256m",

        // faster random source
        "-Djava.security.egd=file:/dev/./urandom"
      )

      if (sys.props.contains("akka.ci-server"))
        defaults ++ Seq("-XX:+PrintGCTimeStamps", "-XX:+PrintGCDetails")
      else
        defaults
    },


    // all system properties passed to sbt prefixed with "akka." will be passed on to the forked jvms as is
    javaOptions in Test := {
      val base = (javaOptions in Test).value
      val akkaSysProps: Seq[String] =
        sys.props.filter(_._1.startsWith("akka"))
          .map { case (key, value) => s"-D$key=$value" }(breakOut)

      base ++ akkaSysProps
    },

    // with forked tests the working directory is set to each module's home directory
    // rather than the Akka root, some tests depend on Akka root being working dir, so reset
    testGrouping in Test := {
      val original: Seq[Tests.Group] = (testGrouping in Test).value

      original.map { group =>
        group.runPolicy match {
          case Tests.SubProcess(forkOptions) =>
            group.copy(runPolicy = Tests.SubProcess(forkOptions.copy(
              workingDirectory = Some(new File(System.getProperty("user.dir")))
            )))
          case _ => group
        }
      }
    },

    parallelExecution in Test := System.getProperty("akka.parallelExecution", parallelExecutionByDefault.toString).toBoolean,
    logBuffered in Test := System.getProperty("akka.logBufferedTests", "false").toBoolean,

    // show full stack traces and test case durations
    testOptions in Test += Tests.Argument("-oDF"),

    // -v Log "test run started" / "test started" / "test run finished" events on log level "info" instead of "debug".
    // -a Show stack traces and exception class name for AssertionErrors.
    testOptions += Tests.Argument(TestFrameworks.JUnit, "-v", "-a")
  ) ++
    mavenLocalResolverSettings ++
    JUnitFileReporting.settings ++
    docLintingSettings

  lazy val docLintingSettings = Seq(
     javacOptions in compile ++= Seq("-Xdoclint:none"),
     javacOptions in test ++= Seq("-Xdoclint:none"),
     javacOptions in doc ++= Seq("-Xdoclint:none")
   )

  def loadSystemProperties(fileName: String): Unit = {
    import scala.collection.JavaConverters._
    val file = new File(fileName)
    if (file.exists()) {
      println("Loading system properties from file `" + fileName + "`")
      val in = new InputStreamReader(new FileInputStream(file), "UTF-8")
      val props = new Properties
      props.load(in)
      in.close()
      sys.props ++ props.asScala
    }
  }

  def majorMinor(version: String): Option[String] ="""\d+\.\d+""".r.findFirstIn(version)
}