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:- module(agent, [init, look/0, move/1, take/1]).
:- consult('parser.prolog').
:- consult('map.prolog').
% initialisation
init :-
retractall(here(_)),
asserta(here(a)), !.
% command functions
look :-
here(L),
writeItemsAt(L),
writeExits(L).
move(D) :-
here(L),
connects(L,N,D),
retract(here(L)),
asserta(here(N)), !.
take(T) :-
here(L),
itemAt(T,L),
canTake(T),
retract(itemAt(T,L)),
asserta(holding(T)),
write('Taken.'), !.
% letting the player know what's going on
writeItemsAt(L) :-
itemAt(X,L),
description(X,D),
write(D),
fail.
writeItemsAt(_) :- true.
writeExits(L) :-
connects(L,_,D),
join(['You see an exit to the ',D,'.\n'],M),
write(M),
fail.
writeExits(_) :- true.
% basic facts about the maze
itemAt(ladder,a).
canTake(gold).
canTake(deadWumpus).
description(ladder, 'There is a rope ladder hanging from the ceiling here.\n').
description(gold, 'You see a glitter along the sandy floor of the cave.\n').
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