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package protocbridge

import java.{util => ju}

object SystemDetector {
  private val UNKNOWN = "unknown"
  private val X86_64_RE = "^(x8664|amd64|ia32e|em64t|x64)$".r
  private val X86_32_RE = "^(x8632|x86|i[3-6]86|ia32|x32)$".r

  def normalizedOs(s: String): String =
    normalize(s) match {
      case p if p.startsWith("aix")                           => "aix"
      case p if p.startsWith("hpux")                          => "hpux"
      case p if p.startsWith("linux")                         => "linux"
      case p if p.startsWith("osx") || p.startsWith("macosx") => "osx"
      case p if p.startsWith("windows")                       => "windows"
      case p if p.startsWith("freebsd")                       => "freebsd"
      case p if p.startsWith("openbsd")                       => "openbsd"
      case p if p.startsWith("netbsd")                        => "netbsd"
      case _                                                  => UNKNOWN
    }

  def normalizedArch(s: String): String =
    normalize(s) match {
      case X86_64_RE(_) => "x86_64"
      case X86_32_RE(_) => "x86_32"
      case "aarch64"    => "aarch_64"
      case "ppc64le"    => "ppcle_64"
      case "ppc64"      => "ppc_64"
      case "s390x"      => "s390x"
      case _            => UNKNOWN
    }

  def detectedClassifier(): String = {
    val osName = sys.props.getOrElse("os.name", "")
    val osArch = sys.props.getOrElse("os.arch", "")
    System.getProperty("os.name")
    normalizedOs(osName) + "-" + normalizedArch(osArch)
  }

  def normalize(s: String) =
    s.toLowerCase(ju.Locale.US).replaceAll("[^a-z0-9]+", "")
}