# OnBegin spins up the state machine in the background and returns immediately.
InternalStateMachineHandler(NPCAgent : agent) : void =
    spawn{ InternalStateMachine(NPCAgent) }

# The dispatcher: pick the current state and run its method.
InternalStateMachine(InAgent : agent)<suspends> : void =
    case (CurrentState):
        npc_states.Idle  => StateIdle(InAgent)
        npc_states.Sleep => StateSleep(InAgent)
        npc_states.Hint  => StateHint(InAgent)
        # ...one method per state