import play.api.libs.json.{Json, JsValue}

import scala.collection.mutable

trait Writeable {

}

case class WriteableInt(v: Int) extends Writeable
case class WriteableLong(v: Long) extends Writeable
case class WriteableString(v: String) extends Writeable
case class WriteableJson(v: JsValue)

object WriteableJson {
  implicit def jsonToWriteable(jsValue: WriteableJson): Writeable = new WriteableString(jsValue.toString())
}

object Writeable {
  implicit val w: Writer[Writeable] = new Writer[Writeable]()

  implicit def intToWriteable(i: Int): Writeable = new WriteableInt(i)
  implicit def longToWriteable(i: Long): Writeable = new WriteableLong(i)
  implicit def stringToWriteable(i: String): Writeable = new WriteableString(i)
}

class Writer[T] {
  def write(v: T) = println(v.toString)
}

class TestBindable {
  val params = mutable.Map[String,Writeable]()

  def bind(p: Map[String,Writeable]) = params ++= p

  def proceed() = {
    for {
      (k,v) <- params
    }{
      write(v)
    }
  }

  def write[T](v: T)(implicit writer: Writer[T]) = writer.write(v)
}

val t = new TestBindable

t.bind(Map("int" -> 1, "long" -> 1l, "string" -> "foo", "json" -> new WriteableJson(Json.obj("foo" -> "bar"))))

t.proceed()