/*
 * Copyright (C) 2009-2019 Lightbend Inc. <https://www.lightbend.com>
 */

package akka

import scala.collection.immutable
import sbt._
import sbt.Keys._
import com.typesafe.tools.mima.plugin.MimaPlugin
import com.typesafe.tools.mima.plugin.MimaPlugin.autoImport._

object MiMa extends AutoPlugin {

  private val latestPatchOf25 = 23
  // No 2.6 has been released yet. Update to '0' after releasing 2.6.0
  private val latestPatchOf26 = -1

  override def requires = MimaPlugin
  override def trigger = allRequirements

  override val projectSettings = Seq(
    mimaPreviousArtifacts := akkaPreviousArtifacts(name.value, organization.value, scalaBinaryVersion.value))

  def akkaPreviousArtifacts(
      projectName: String,
      organization: String,
      scalaBinaryVersion: String): Set[sbt.ModuleID] = {

    val versions: Seq[String] = {
      scalaBinaryVersion match {
        case "2.12" =>
          val firstPatchOf25 =
            if (projectName.contains("discovery")) 19
            else if (projectName.contains("coordination")) 22
            else 0

          if (!projectName.contains("typed")) {
            expandVersions(2, 5, firstPatchOf25 to latestPatchOf25)
          } else {
            Nil
          } ++ expandVersions(2, 6, 0 to latestPatchOf26)
        case v if v.startsWith("2.13") =>
          // When 2.13.0 is actually out, release 2.5.latestPatchOf25 for that
          // and add it here. https://github.com/akka/akka/issues/26764
          expandVersions(2, 6, 0 to latestPatchOf26)
      }
    }

    val akka25PromotedArtifacts = Set("akka-distributed-data")
    val akkaTypedModules = Set("akka-actor-typed")

    // check against all binary compatible artifacts
    versions.map { v =>
      val adjustedProjectName =
        if (akka25PromotedArtifacts(projectName) && v.startsWith("2.4"))
          projectName + "-experimental"
        else
          projectName
      organization %% adjustedProjectName % v
    }.toSet
  }

  private def expandVersions(major: Int, minor: Int, patches: immutable.Seq[Int]): immutable.Seq[String] =
    patches.map(patch => s"$major.$minor.$patch")
}