fix: BAC-29 Implement Mappers for Common Classes (#101)

Reviewed-on: #101
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

knockoutwhistweb/app/dto/CardDTO.scala

@@ -0,0 +1,26 @@
+package dto
+
+import de.knockoutwhist.cards.Card
+import play.api.libs.json.{Json, OFormat}
+import util.WebUIUtils
+
+case class CardDTO(identifier: String, path: String, idx: Int) {
+  
+  def toCard: Card = {
+    WebUIUtils.stringToCard(identifier)
+  }
+  
+}
+
+object CardDTO {
+  
+  implicit val cardFormat: OFormat[CardDTO] = Json.format[CardDTO]
+  
+  def apply(card: Card, index: Int = 0): CardDTO = {
+    CardDTO(
+      identifier = WebUIUtils.cardtoString(card),
+      path = WebUIUtils.cardToPath(card),
+      idx = index
+    )
+  }
+}