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:- module(agent, [init/0, look/0, move/1, take/1, shoot/1, hazardAt/1, somethingAt/1]).
:- consult('misc.prolog').
:- consult('parser.prolog').
:- consult('map.prolog').
% initialisation
init :-
retractall(here(_)),
retractall(pitAt(_)),
retractall(wumpusAt(_)),
retractall(goldAt(_)),
retractall(batsAt(_)),
initPos,
initPits,
initWumpus,
initGold,
initBats,
roomList(Rooms),
filter(Rooms, hazardAt, Walkable),
isConnected(Walkable) *-> !; init.
initPos :-
retractall(moves(_)),
asserta(moves(0)),
roomList(Rooms),
filter(Rooms, somethingAt, Emptyrooms),
random_member(X,Emptyrooms),
asserta(here(X)).
initPits :- insert(4,pitAt).
initWumpus :-
roomList(Rooms),
filter(Rooms, somethingAt, Emptyrooms),
random_member(X,Emptyrooms),
asserta(wumpusAt(X)).
initGold :-
retractall(haveGold(_)),
insert(3,goldAt),
asserta(haveGold(0)).
initBats :- insert(2,batsAt).
insert(N,Thing) :-
N > 0,
Nx is N - 1,
insert(Nx,Thing),
roomList(Rooms),
filter(Rooms, somethingAt, Emptyrooms),
random_member(X,Emptyrooms),
P =.. [Thing,X],
asserta(P).
insert(0,_) :- 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),
checkHazards,
incrementMoves,
look, !.
move(_) :-
write('Unknown direction.\n\n').
take(gold) :-
here(Location),
goldAt(Location),
retract(goldAt(Location)),
haveGold(G),
Gx is G + 1,
retract(haveGold(G)),
asserta(haveGold(Gx)),
write('You find some gold. Lucky you.\n\n'),
incrementMoves, !.
take(_) :-
write('You cannot take that.\n\n').
shoot(Direction) :-
here(Location),
connects(Location, Target, Direction),
wumpusAt(Target),
write('You hear an unearthly scream.\n\n'),
retract(wumpusAt(Target)),
incrementMoves,
win.
shoot(Direction) :-
here(Location),
connects(Location, Target, Direction),
not(wumpusAt(Target)),
write('Thunk. Missed.\n\n'),
incrementMoves,
moveWumpus.
shoot(_) :-
write('Unknown target.\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\n'],W),
write(W).
% modifying things and checking the ramifications
moveWumpus :-
wumpusAt(Old),
findall(X, connects(Old,X,_), PossibleNews),
random_member(New, PossibleNews),
retract(wumpusAt(Old)),
asserta(wumpusAt(New)),
checkWumpus.
checkHazards :-
checkWumpus,
checkBats,
checkPit.
checkWumpus :-
current_predicate(wumpusAt/1),
here(Location),
wumpusAt(Location),
lose(eaten).
checkWumpus :- true.
checkBats :-
current_predicate(batsAt/1),
here(Location),
batsAt(Location),
write('A giant bat swoops down, picks you up, and deposits you elsewhere in the cave.\n\n'),
roomList(Rooms),
random_member(NewLocation, Rooms),
retract(here(Location)),
asserta(here(NewLocation)),
checkHazards.
checkBats :- true.
checkPit :-
current_predicate(pitAt/1),
here(Location),
pitAt(Location),
lose(pit).
checkPit :- true.
% winning, losing, and otherwise
incrementMoves :-
moves(N),
retractall(moves(_)),
Nx is N + 1,
asserta(moves(Nx)).
win :-
write('*** YOU WIN ***\n'),
moves(M),
haveGold(G),
join(['\nWin accomplished in ',M,' moves with ',G,' gold found\n'],W),
write(W),
halt(0).
lose(eaten) :-
write('You have been eaten by the wumpus.\n\n'),
write('*** GAME OVER ***\n'),
halt(0).
lose(pit) :-
write('You have fallen into a bottomless pit.\n\n'),
write('*** GAME OVER ***\n'),
halt(0).
% miscellaneous clauses
somethingAt(X) :- current_predicate(here/1), here(X).
somethingAt(X) :- current_predicate(goldAt/1), goldAt(X).
somethingAt(X) :- hazardAt(X).
hazardAt(X) :- current_predicate(wumpusAt/1), wumpusAt(X).
hazardAt(X) :- current_predicate(pitAt/1), pitAt(X).
hazardAt(X) :- current_predicate(batsAt/1), batsAt(X).
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