server: Remove Tick event encoder

jvm/src/main/scala/cs214/webapp/server/StateMachine.scala

@@ -74,23 +74,15 @@ abstract class ClockDrivenStateMachine[Event, State, View]
     */
   val clockDrivenWire: AppWire[Event, View]
 
-  override object wire extends AppWire[Either[Tick, Event], View]:
-    override object eventFormat extends WireFormat[Either[Tick, Event]]:
-      override def decode(json: ujson.Value): Try[Either[Tick, Event]] =
-        Try:
-          val isClockEvent =
-            json.objOpt
-              .flatMap(_.get(ClockDrivenStateMachine.CLOCK_EVENT_HEADER))
-              .exists(_.bool)
+  override object wire extends ClockDrivenWire(clockDrivenWire)
 
-          if isClockEvent then Left(TickEventFormat.decode(json.obj.get("tick").get).get)
-          else Right(clockDrivenWire.eventFormat.decode(json).get)
+private class ClockDrivenWire[Event, View](wire: AppWire[Event, View]) extends AppWire[Either[Tick, Event], View]:
+  override object eventFormat extends WireFormat[Either[Tick, Event]]:
+    override def decode(json: ujson.Value): Try[Either[Tick, Event]] = Try:
+      Right(wire.eventFormat.decode(json).get)
 
-      override def encode(t: Either[Tick, Event]): ujson.Value =
-        throw IllegalStateException("This shouldn't be used. Please use the ScalApp's wire instead.")
+    override def encode(t: Either[Tick, Event]): ujson.Value =
+      require(t.isRight, "Tick events should not be sent over the network.")
+      wire.eventFormat.encode(t.toOption.get)
 
-    override val viewFormat: WireFormat[View] = clockDrivenWire.viewFormat
-
-object ClockDrivenStateMachine:
-  val CLOCK_EVENT_HEADER = "X-Clock"
-  val CLOCK_EVENT_TICK_HEADER = "tick"
+  override val viewFormat: WireFormat[View] = wire.viewFormat