module game
open System.Collections.Generic
open System.Collections
open System.Console
open Microsoft.FSharp.Collections
open System.Linq
open Casanova.Query

worldEntity World =
  {
    Observer : Observer
    Create() =
      {
        Observer = Observer.Create(new Subject())
      }
  }

entity Subject =
  {
    Guard : bool
    rule Guard =
      wait 1
      yield true
      yield false
    Create() =
      {
        Guard = false
      }
  }

entity Observer =
  {
    Action  : int
    Subject : Subject

    rule Action =
      wait Subject.Guard
      yield Action + 1

    Create(Subject s) =
      {
        Subject = s
        Action = 0
      }
  }