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implicit val gameEventFormat = Json.format[GameEvent]
implicit val gameEventFrameFormatter = FrameFormatter.jsonFrame[GameEvent]

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case class GameEvent(gameId: String, eventType: String, data: JsValue)

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class WebsocketEventPublisher(gameId: String, out: ActorRef)
  extends Actor
  with ActorLogging
  with ImplicitFlowMaterializer {

  import context.dispatcher

  override def preStart() = {
    import Global.connection
    import Config.Events._

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def gameEvents(gameId: String) = WebSocket.acceptWithActor[String, GameEvent] { request => out =>
  WebsocketEventPublisher.props(gameId, out)
}

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def createGame() = Action.async { request =>
  WS.url(s"$apiUrl/game")
    .post("")
    .map {
      case res if res.status == CREATED => Created(res.body)
      case _ => InternalServerError
    }
    .recover { case _ => InternalServerError }
  }

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POST    /game                           controllers.MainController.createGame
POST    /game/:gameId/start             controllers.MainController.startGame(gameId: String, playersCount: Int)
POST    /game/:gameId/roll/:playerId    controllers.MainController.roll(gameId: String, playerId: String)

GET     /:gameId/events                 controllers.MainController.gameEvents(gameId: String)

// other routes: static resources, main page