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:- module(agent, [init, look/0, move/1, take/1]).
:- consult('parser.prolog').
:- consult('map.prolog').
% initialisation
init :-
initPos,
initPits,
initWumpus,
initGold,
initBats, !.
initPos :-
retractall(here(_)),
roomList(Rooms),
filter(Rooms, somethingAt, Emptyrooms),
random_member(X,Emptyrooms),
asserta(here(X)).
initPits :- true.
initWumpus :-
retractall(wumpusAt(_)),
roomList(Rooms),
filter(Rooms, somethingAt, Emptyrooms),
random_member(X,Emptyrooms),
asserta(wumpusAt(X)).
initGold :- true.
initBats :- true.
% command functions
look :-
here(Location),
writeSenses(Location),
writeExits(Location).
move(Direction) :-
here(Location),
connects(Location, New, Direction),
retract(here(Location)),
asserta(here(New)),
join(['You move to the ',Direction,' .\n\n'],W),
write(W), !.
take(Item) :-
here(Location),
itemAt(Item,Location),
canTake(Item),
retract(itemAt(Item,Location)),
asserta(holding(Item)),
write('Taken.\n\n'), !.
% letting the player know what's going on
writeSenses(Location) :-
glitter(Location),
breeze(Location),
bats(Location),
stench(Location).
glitter(Location) :-
current_predicate(goldAt/1),
goldAt(Location),
write('You see a glitter along the sandy floor of the cave.\n').
glitter(_) :- true.
breeze(Location) :-
current_predicate(pitAt/1),
connects(Location, ConnectedRoom, _),
pitAt(ConnectedRoom),
write('A cold breeze blows through the room, making you shiver slightly.\n').
breeze(_) :- true.
bats(Location) :-
current_predicate(batsAt/1),
connects(Location, ConnectedRoom, _),
batsAt(ConnectedRoom),
write('All available surfaces are covered in guano. How unsanitary.\n').
bats(_) :- true.
stench(Location) :-
current_predicate(wumpusAt/1),
connects(Location, ConnectedRoom, _),
wumpusAt(ConnectedRoom),
write('An overpowering stench fills your nose.\n').
stench(_) :- true.
writeExits(Location) :-
findall(X, connects(Location,_,X), Exits),
intercalate(Exits, ', ', O),
join(['There are exits to the ',O,'.\n'],W),
write(W).
% miscellaneous clauses
somethingAt(X) :- current_predicate(here/1), here(X).
somethingAt(X) :- current_predicate(wumpusAt/1), wumpusAt(X).
somethingAt(X) :- current_predicate(pitAt/1), pitAt(X).
somethingAt(X) :- current_predicate(goldAt/1), goldAt(X).
somethingAt(X) :- current_predicate(batsAt/1), batsAt(X).
intercalate([X|Y], Spacer, Result) :-
intercalate(Y, Spacer, Tail),
atom_concat(X, Spacer, Head),
atom_concat(Head, Tail, Result).
intercalate([X], _, Result) :- Result = X.
filter(List, Predicate, Result) :-
Test =.. [Predicate,X],
findall(X, Test, No),
subtract(List, No, Result).
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