package database

import scala.reflect.ClassTag

trait Mapper[T] {
  def map(row: List[Any]): T
}

class TestUnappMacro {

  import TestUnappMacro._

  def callByName(f: => Unit) = f
  def callAnon(f: () => Any) = f

  callAnon(() => {
    case class Something(id: Int, name: String)
    getMapper[Something](this).map(List(10, "jack"))
  }) // так работает

  callByName {       // так нет
    case class Something(id: Int, name: String)
    getMapper[Something](this).map(List(10, "jack"))
  }

}

object TestUnappMacro {

  def getMapper[T: ClassTag](out: Any) = {

    val tt = implicitly[ClassTag[T]]

    val rclass = tt.runtimeClass

    val ctor = rclass.getConstructors()(0)
    val ctypes = ctor.getParameterTypes

    ctypes.foreach((t) => println(t))

    val cl = getClass

    new Mapper[T] {
      def map(row: List[Any]): T = {
        ctor.newInstance(out.asInstanceOf[Object]::row.map(_.asInstanceOf[Object]):_*).asInstanceOf[T]
      }

    }
  }

}

object Run extends App {
  new TestUnappMacro
}