trait HttpRequest {
  val host: String
  val path: String
}
case class Get(host: String, path: String) extends HttpRequest
case class Post(host: String, path: String) extends HttpRequest
case class Delete(host: String, path: String) extends HttpRequest

case class HttpResponse(status: Int, body: String)

case class Server(route: PartialFunction[HttpRequest, HttpResponse]) {
  def handle(request: HttpRequest): HttpResponse = {
    if (route.isDefinedAt(request)) {
      route(request)
    } else {
      HttpResponse(500, s"unknown request type $request")
    }

  }
}

object Example {

  def main(args: Array[String]): Unit = {
    //println(check(Complex(Number(3),Number(4))))

    val route1: PartialFunction[HttpRequest, HttpResponse] = {
      case Get(host, path) => HttpResponse(200, path)
      case Post("localhost", path) =>
        // upload a file
        HttpResponse(200, "file uploaded")
      case Post(_, path) =>
        HttpResponse(403, "forbidden")
    }

    val route2: PartialFunction[HttpRequest, HttpResponse] = {
      case Delete("localhost", _) => HttpResponse(200, "deleted")
    }


    val route = route1 orElse route2

    val server: Server = Server(route)


    val requests: List[HttpRequest] = List(
      Post("localhost", "foo.txt"),
      Get("localhost", "foo.txt"),
      Delete("localhost","foo.txt"),
      Get("localhost", "foo.txt")
    )

    val responses: List[HttpResponse] = requests.map(server.handle(_))

    for (response <- responses) {
      println(response)
    }

  }

}