// ----------------------------- MEANINGS ------------------------

// actor(?A)       ?A is an actor in the scene.
// shocked(?A)     ?A is in mental state: shocked.
// can_exit(?A)    ?A is allowed to leave the scene.
// item(?I)        ?I is an item in the scene.
// drink(?I)       ?I is an item that can be drank.
// holding(?A, ?I) ?A is an actor holding item ?I.
// unheld(?I)      ?I is an item that is not currently held.
// prop(?P)        ?P is a prop in the scene.
// seat(?S)        ?S is a prop that can be sat on.
// sitting(?A)
// sitting_on(?A,?S)
// empty(?S)       ?S is a seat that is not currently occupied.
// fenestration(?P)  ?P is a prop that can be looked out of to the outside.
// near(?A)        ?A is near a prop.
// near_to(?A,?P)  ?A is an actor who is near or next to prop ?P.
// described(?P)   ?P is a prop that has been described.

// topic(?T)       ?T is a topic of conversation.
// has-news(?A,?T) ?A has news which is ?T

// ----------------------------- RULES ------------------------

scenario Rules {
  [actor(?A),item(?I),unheld(?I)]     ?A picked up the ?I.   [holding(?A,?I),!unheld(?I)]
  [actor(?A),item(?I),holding(?A,?I)] ?A put down the ?I.    [!holding(?A,?I),unheld(?I)]

  [actor(?A),item(?I),holding(?A,?I),drink(?I)] ?A took a sip of the ?I. []

  [actor(?A),!sitting(?A)]                    ?A walked around the room. []
  [actor(?A),!sitting(?A),seat(?S),empty(?S)] ?A sat down on the ?S.     [sitting(?A),sitting_on(?A,?S),!empty(?S)]
  [actor(?A),sitting(?A),sitting_on(?A,?S)]   ?A leaned back in the ?S.  []
  [actor(?A),sitting(?A),sitting_on(?A,?S)]   ?A got up and stretched.   [!sitting(?A),!sitting_on(?A,?S),empty(?S)]

  [actor(?A),can_exit(?A)]  ?A left the room.  [!actor(?A)]

  [actor(?A)]  ?A coughed.  []
  [actor(?A)]  ?A rubbed his chin.  []
  [actor(?A),shocked(?A)]  ?A gasped.  []
  [actor(?A),shocked(?A)]  ?A stared blankly off into space.  []
  [actor(?A),shocked(?A)]  ?A winced.  []

  [actor(?A),actor(?B)]  ?A looked at ?B.  []
  [actor(?A),actor(?B)]  ?A nodded to ?B.  []

  [actor(?A),fenestration(?P)]  ?A looked out the ?P.  []

  [actor(?A),!sitting(?A),prop(?P),!near(?A)]  ?A walked over to the ?P.    [near(?A),near_to(?A,?P)]
  [actor(?A),near_to(?A,?P)]                   ?A examined the ?P closely.  []
  [actor(?A),near_to(?A,?P)]                   ?A walked away from the ?P.  [!near(?A),!near_to(?A,?P)]

  [prop(?P),!described(?P)]  Nearby there was a ?P.  [described(?P)]

  [actor(?A),has-news(?A,?T),!exclaimed-has-news(?A,?T)]    ?A exclaimed, "I have news!"  [exclaimed-has-news(?A,?T)]
  [actor(?A),exclaimed-has-news(?B,?T),!heard-news(?A,?T)]  ?A asked, "What is it, ?B?"   [been-asked-about-news(?B,?T)]
  [actor(?A),been-asked-about-news(?A,?T),actor(?B)]        ?A told ?B of the ?T.         [heard-news(?B,?T)]
}

// ----------------------------- SETTINGS ------------------------

scenario SittingRoom {
    prop(desk).
    prop(bookshelf).
    prop(window). fenestration(window).
    prop(grandfather_clock).
    prop(leather_chair).

    seat(leather_chair).
    empty(leather_chair).

    item(newspaper).
    item(whiskey). drink(whiskey).
    item(brandy). drink(brandy).
    item(pocket_watch).

    unheld(newspaper).
    unheld(whiskey).
    unheld(brandy).
    unheld(pcoket_watch).
}

scenario GardenShed {
    prop(workbench).
    prop(window). fenestration(window).
    prop(bags_of_potting_soil).

    seat(bags_of_potting_soil).
    empty(bags_of_potting_soil).

    item(oilcan).
    item(wrench).
    item(screwdriver).

    unheld(oilcan).
    unheld(wrench).
    unheld(screwdriver).
}

// ----------------------------- SCENES ------------------------

scenario Scene_1 {
    import SittingRoom.
    import Rules.

    actor(Pranehurst).
    actor(Scurthorpe).
    actor(Throgmorton).

    topic(impending_hurricane).
    has-news(Scurthorpe, impending_hurricane).

    shocked(Throgmorton).

    goal [heard-news(Throgmorton, impending_hurricane)].
}

scenario Scene_2 {
    import GardenShed.
    import Rules.

    actor(Pranehurst).
    actor(Scurthorpe).
    actor(Throgmorton).

    shocked(Throgmorton).
    can_exit(Scurthorpe).

    goal [].
}

scenario Scene_3 {
    import SittingRoom.
    import Rules.

    actor(Pranehurst).
    actor(Scurthorpe).
    actor(Throgmorton).

    can_exit(Pranehurst).
    can_exit(Scurthorpe).
    can_exit(Throgmorton).

    goal [].
}