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overcast.pl
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/* Overcast, by Aleksandra Piekarzewicz,
Przemysław Pąk, Maksym Nedashkivskyi. */
/* ------------ Dynamic section --------------- */
:- dynamic started/0.
:- dynamic i_am_at/1, at/2.
:- dynamic in_inventory/1, locked/1, shining/1, alive/1.
:- dynamic wet/1, frozen/1, hot/1, vulnerable/1. % Statuses from spells.
:- discontiguous locked/1, alive/1, immovable/1, wet/1. % To remove warnings.
/* ----------------- Paths ----------------- */
path(entrance, n, shed).
path(shed, s, entrance).
path(entrance, w, room_south).
path(room_south, e, entrance).
path(room_south, n, room_north).
path(room_north, s, room_south).
path(room_north, w, pond_room).
path(pond_room, e, room_north).
path(pond_room, s, boss_room).
path(boss_room, n, pond_room).
/* ------------- Objects in locations ------------- */
/* Room Z1 (entrance) */
at(red_bowl, entrance).
at(white_bowl, entrance).
at(green_bowl, entrance).
at(blue_orb, red_bowl).
at(green_orb, green_bowl).
at(golden_ring, entrance).
at(gate, entrance).
/* Room Z1A (shed) */
at(box, shed).
at(blue_bowl, shed).
at(red_orb, box).
at(curious_rat, shed).
/* Room Z2 (south) */
at(fountain, room_south).
at(wooden_torch_holder, room_south).
at(wooden_torch, wooden_torch_holder).
at(cut_rope, room_south).
at(scissors, room_south).
at(confused_rat, room_south).
/* Room Z2 (north) */
at(fancy_fountain, room_north).
at(torch_holder, room_north).
at(torch, torch_holder).
at(rope, room_north).
at(long_plank, room_north).
at(valve, room_north).
at(gateway, room_north).
/* Room Z3 (pond) */
at(pond, pond_room).
/* Room Z4 (boss) */
at(guardian, boss_room).
at(exit, boss_room).
/* --------- Objects' starting statuses ------------ */
% immovable - the player cannot take this item.
% locked - it has to be unlocked somehow to proceed.
% shining - on a good way to solve a puzzle.
% alive - mostly rats.
% cut - only for ropes.
/* Room Z1 (entrance) */
immovable(red_bowl).
immovable(white_bowl).
immovable(green_bowl).
immovable(gate).
locked(gate).
shining(green_bowl).
shining(white_bowl).
frozen(white_bowl).
/* Room Z1A (shed) */
immovable(blue_bowl).
immovable(box).
alive(curious_rat).
/* Room Z2A (south courtyard) */
wet(fountain).
immovable(fountain).
immovable(wooden_torch_holder).
immovable(cut_rope).
cut(cut_rope).
alive(confused_rat).
/* Room Z2B (north courtyard) */
hot(torch).
immovable(fancy_fountain).
immovable(torch_holder).
immovable(rope).
immovable(valve).
immovable(gateway).
locked(gateway).
/* Room Z3 (pond room) */
wet(pond).
locked(pond).
immovable(pond).
/* Room Z4 (boss room) */
alive(guardian).
locked(exit).
immovable(exit).
/* ------------- Puzzle mechanics ------------- */
assert_shining(X) :-
not(shining(X)),
assert(shining(X)),
check_solution, !.
torches :-
((at(torch, torch_holder), at(wooden_torch, wooden_torch_holder));
(at(wooden_torch, torch_holder), at(torch, wooden_torch_holder))),
((hot(torch), hot(wooden_torch));(not(hot(torch)), not(hot(wooden_torch)))).
fountains :-
(wet(fountain), wet(fancy_fountain));
(frozen(fountain), frozen(fancy_fountain));
((not(frozen(fountain)), not(wet(fountain))),
(not(frozen(fancy_fountain)), not(wet(fancy_fountain)))).
check_solution :-
locked(gateway),
(i_am_at(room_north); i_am_at(room_south)),
cut(rope), cut(cut_rope),
torches, fountains,
retractall(locked(gateway)), nl,
write('Now the two courtyards look like mirror images of each other. '),
nl, write('The '),
ansi_format([bold,fg(magenta)], 'gateway', [_]),
write(' opens so you can visit next part of the Gardens.'), !, nl.
check_solution :-
locked(gate),
(i_am_at(entrance); i_am_at(shed)),
shining(blue_bowl), shining(red_bowl),
shining(green_bowl), shining(white_bowl),
retractall(locked(gate)),
nl, write('The '),
ansi_format([bold,fg(magenta)], 'gate', [_]),
write(' opens, inviting you to enter the Gardens.'), !, nl.
check_solution :-
not(shining(pond)),
((frozen(pond), write(' Great! Now you can walk on (frozen) water!')) ;
(at(long_plank, pond), write(' Great! Now you have a weakling-style makeshift bridge!'))),
retractall(locked(pond)), assert(shining(pond)), !, nl.
check_solution :-
nb_getval(value, BossHP),
BossHP =:= 0, retractall(at(guardian, boss_room)), retractall(locked(exit)), nl,
write('The Guardian growls and dissolves in the air!'), nl,
write('> Brusto (in total disbelief) says: "We did it!"'),
nl, sleep(4), outro, !, nl.
check_solution :- % pass quietly even if conditions not satisfied
true.
/* ------------- Bossfight mechanics ------------- */
setup_boss :-
BossHP is 100,
nb_setval(value, BossHP),
assert(vulnerable(water)).
set_next_vulnerability :-
Val is random(3),
((Val =:= 0, assert(vulnerable(water)));
(Val =:= 1, assert(vulnerable(cold)));
(Val =:= 2, assert(vulnerable(sun)))).
print_hp :-
nb_getval(value, BossHP),
write('Guardian''s HP: '),
ansi_format([bold,fg(green)], '~w', [BossHP]), write('.'), !, nl.
decrement_hp :-
nb_getval(value, BossHP),
HP is BossHP - 20,
nb_setval(value, HP),
write('Guardian''s HP: '),
ansi_format([bold,fg(green)], '~w', [HP]), write('.'), !, nl.
increment_hp :- % currently unused
nb_getval(value, BossHP),
HP is BossHP + 20,
nb_setval(value, HP),
write('Guardian''s HP: '),
ansi_format([bold,fg(green)], '~w', [HP]), write('.'), !, nl.
/* ----------- Describing places and objects ----------- */
describe(entrance) :-
write('You are standing before an entrance gate to the Gardens.'), nl,
write('The birds are chirping merrily. The wind plays with your hair gently.'), nl,
write('> Brusto says: "What a nice day to die, isn''t it?"'), !, nl.
describe(gate) :-
write('A huge gate guarding the entrance to the gardens.'), !, nl.
describe(red_bowl) :-
write('A large red stone bowl.'), nl,
write('It is decorated with patterns resembling fire. '), !, nl.
describe(blue_bowl) :-
write('A large blue stone bowl.'), nl,
write('It is decorated in a nautical theme.'), !, nl.
describe(white_bowl) :-
write('A large white stone bowl.'), nl,
write('It is decorated with snowflake patterns.'), !, nl.
describe(green_bowl) :-
write('A large green stone bowl.'), nl,
write('It is decorated with acanthus leaves.'), !, nl.
describe(golden_ring) :-
write('A richly decorated ring made entirely of gold.'), nl,
write('It seems too big for a human finger.'), !, nl.
describe(box) :-
write('A very outstanding box.'), !, nl.
describe(red_orb) :-
write('A fiery looking red orb.'), nl,
write('Ingredients: 90% color magic, 10% glass.'), !, nl.
describe(blue_orb) :-
write('A blue orb with water swirling inside.'), nl,
write('Ingredients: 90% color magic, 10% glass.'), !, nl.
describe(green_orb) :-
write('A green orb covered with moss.'), nl,
write('Ingredients: 90% color magic, 10% glass.'), !, nl.
describe(shed) :-
write('You are in a small shed near the entrance.'), nl,
write('There are some chests here, but you don''t care. You are not a chest mage.'), !, nl.
describe(confused_rat) :-
write('> Confused rat says: "Squeak! These two courtyards look nearly the same... It''s so confusing!"'), !, nl.
describe(curious_rat) :-
write('> Curious rat says: "Squeak! I wonder what makes the stone bowls shine?"'), !, nl.
describe(fountain) :-
write('A typical fountain you would expect in a magic garden.'), !, nl.
describe(fancy_fountain) :-
write('A typical fountain you would expect in a magic garden... but fancier!'), !, nl.
describe(rope) :-
write('Thick rope attached to the fence.'), !, nl.
describe(cut_rope) :-
write('Thick rope attached to the fence.'), !, nl.
describe(torch_holder) :-
write('A torch holder that can hold a burning torch.'), !, nl.
describe(wooden_torch_holder) :-
write('A torch holder that can hold a burning torch.'), !, nl.
describe(torch) :-
write('A regular old-fashioned wooden torch.'), !, nl.
describe(wooden_torch) :-
write('A regular old-fashioned wooden torch.'), !, nl.
describe(scissors) :-
write('A pair of large scissors, most likely used for pruning branches.'), !, nl.
describe(valve) :-
write('A valve. It''s obviously connected with the fancy fountain.'), !, nl.
describe(long_plank) :-
write('A long, solid wooden plank.'), !, nl.
describe(room_south) :-
write('You are in a small courtyard. You are surrounded by flower beds,'), nl,
write('but the most eye-catching feature is the large fountain in the center.'), !, nl.
describe(room_north) :-
write('You are in another small courtyard. It looks strangely familiar.'), nl,
write('The richly decorated fountain in the center seems to have been unused for a long time.'), !, nl.
describe(pond_room) :-
write('There is a large pond in front of you.'), nl,
write('> Brusto says: "Bridges are for the weaklings!" and joyfully hovers over the water.'), nl,
write('It seems that you are the weakling and cannot pass, unless you find another way...'), !, nl.
describe(pond) :-
write('> Brusto says: "It''s definitely not a time for a bath."'), !, nl.
describe(exit) :-
write('> Brusto says: "Close(d) enough."'), !, nl.
describe(boss_room) :-
write('This part of the Gardens seems very quiet. You feel that you are almost there.'), nl,
write('But a giant beast with two beaks and golden feathers stands in front of you.'), nl, nl,
write(' #__# '), nl,
write(' (o o)'), nl,
write(' |vv| '), nl,
write(' { }'), nl,
write(' [][] '), nl, nl,
write('> The Guardian says: "Only the wisest of mages can enter the Heart of Gardens."'), nl,
write('> Brusto says: "Now we fight... right?"'), !, nl.
describe(guardian) :-
write(' #__# '), nl,
write(' (o o)'), nl,
write(' |vv| '), nl,
write(' { }'), nl,
write(' [][] '), nl, !, nl.
describe(X) :- write('It looks like... a '), write(X), write('.'), !, nl.
/* ------------- Take item ------------- */
take(red_orb) :-
i_am_at(shed),
at(red_orb, box),
retractall(at(red_orb, box)),
assert(in_inventory(red_orb)),
write('You take the fiery looking red orb from the box '), nl,
write('and put it to your bottomless flying chest.'), !, nl.
take(green_orb) :-
i_am_at(entrance),
at(green_orb, green_bowl),
retractall(at(green_orb, green_bowl)),
retractall(shining(green_bowl)),
assert(in_inventory(green_orb)),
write('You take the green orb from the green bowl '), nl,
write('and put it to your bottomless flying chest.'), nl,
write('The bowl stops to shine. Maybe you did something wrong...'), !, nl.
take(red_orb) :-
i_am_at(entrance),
at(red_orb, red_bowl),
not(hot(red_bowl)),
retractall(at(red_orb, red_bowl)),
retractall(shining(red_bowl)),
assert(in_inventory(red_orb)),
write('You take the red orb from the red bowl '), nl,
write('and put it to your bottomless flying chest.'), nl,
write('The bowl stops to shine. Maybe you did something wrong...'), !, nl.
take(blue_orb) :-
i_am_at(shed),
at(blue_orb, blue_bowl),
not(wet(blue_bowl)),
retractall(at(blue_orb, blue_bowl)),
retractall(shining(blue_bowl)),
assert(in_inventory(blue_orb)),
write('You take the blue orb from the blue bowl '), nl,
write('and put it to your bottomless flying chest.'), nl,
write('The bowl stops to shine. Maybe you did something wrong...'), !, nl.
take(Item) :-
in_inventory(Item),
write('> Brusto says: "This item is already in my stomach... I mean, storage!"'),
!, nl.
take(Item) :-
immovable(Item),
i_am_at(Place),
at(Item, Place),
write('> Brusto says: "This object is immovable, I can''t take it!"'),
!, nl.
take(Creature) :-
alive(Creature),
i_am_at(Place),
at(Creature, Place),
write('> Brusto says: "I don''t want to store anything alive inside me..."'),
!, nl.
take(golden_ring) :-
i_am_at(entrance),
at(golden_ring, entrance),
retractall(at(golden_ring, entrance)),
assert(in_inventory(golden_ring)),
write('Nice find!'), !, nl.
take(Item) :-
i_am_at(Place),
at(Item, Place),
retractall(at(Item, Place)),
assert(in_inventory(Item)),
write('The '), write(Item),
write(' is now in your bottomless flying chest.'),
!, nl.
take(Item) :- % Take an item that is nested in another item.
i_am_at(Place),
at(Container, Place),
at(Item, Container),
retractall(at(Item, Container)),
assert(in_inventory(Item)),
write('The '), write(Item),
write(' is now in your bottomless flying chest.'),
!, nl.
take(_) :-
write('> Brusto says: "I don''t sense it here. Maybe you can. But I don''t."'), nl.
/* ----------- Inventory ------------ */
inventory :- i.
i :-
write('Brusto shows you the items that you collected: '), nl, fail.
i :-
in_inventory(Item),
ansi_format([bold,fg(magenta)], '~w', [Item]), write(', '), fail.
i :-
write('*end of inventory*.').
/* -------------- Use one object ---------------------- */
% Aliases for common actions
use(gate) :- go(w), !.
use(gateway) :- go(w), !.
use(curious_rat) :- describe(curious_rat), !.
use(confused_rat) :- describe(confused_rat), !.
use(guardian) :- examine(guardian), !.
use(valve) :-
i_am_at(room_north),
not(wet(fancy_fountain)), not(frozen(fancy_fountain)),
retractall(hot(fancy_fountain)),
assert(wet(fancy_fountain)),
write('You turn the valve and you see the fancy fountain fill with water.'),
check_solution, !, nl.
use(valve) :-
i_am_at(room_north),
wet(fancy_fountain), not(frozen(fancy_fountain)),
retractall(wet(fancy_fountain)),
write('You turn the valve and you see all the water draining from the fancy fountain.'),
check_solution, !, nl.
use(valve) :-
i_am_at(room_north),
frozen(fancy_fountain),
write('The water in the fancy fountain is frozen solid! Nothing happens.'), !, nl.
use(Item) :-
((i_am_at(Place), at(Item, Place)) ; in_inventory(Item)),
write('> Brusto says: "I don''t know what you''ve wanted to do with this '),
ansi_format([bold,fg(magenta)], '~w', [Item]), nl,
write(' but it definitely does NOTHING... at least on our plane of existence."'), !, nl.
use(_) :-
write('You cannot do that. And your magic won''t help.').
/* -------------- Use item on another object ---------------------- */
/* Usage without placing items */
use(_, _) :- nl, fail. % New line before every description
use(scissors, rope) :-
in_inventory(scissors),
i_am_at(room_north),
not(cut(rope)),
assert(cut(rope)),
write('You cut the rope using scissors.'), nl,
write('Now it looks exactly like the rope in the south courtyard.'),
check_solution, !, nl.
use(scissors, rope) :-
in_inventory(scissors),
i_am_at(room_north),
cut(rope),
write('This rope is already cut.'), !, nl.
use(scissors, cut_rope) :-
in_inventory(scissors),
i_am_at(room_south),
write('This rope is already cut.'), !, nl.
use(Item, rope) :-
in_inventory(Item),
i_am_at(room_north),
write('Brusto says: "I don''t think we should hang the '),
ansi_format([bold,fg(magenta)], '~w', [Item]),
write(' on the rope."'), !, nl.
use(Item, cut_rope) :-
in_inventory(Item),
i_am_at(room_south),
write('Brusto says: "I don''t think we should hang the '),
ansi_format([bold,fg(magenta)], '~w', [Item]),
write(' on the rope."'), !, nl.
use(torch, wooden_torch) :-
in_inventory(torch),
i_am_at(Place),
at(Container, Place),
at(wooden_torch, Container),
(hot(wooden_torch); hot(torch)),
assert(hot(wooden_torch)), assert(hot(torch)),
write('Now both torches are '),
ansi_format([bold,fg(red)], 'burning.', [_]), nl,
write('You put the torch back in the magic chest.'), !, nl.
use(wooden_torch, torch) :-
in_inventory(wooden_torch),
i_am_at(Place),
at(Container, Place),
at(torch, Container),
(hot(wooden_torch); hot(torch)),
assert(hot(wooden_torch)), assert(hot(torch)),
write('Now both torches are '),
ansi_format([bold,fg(red)], 'burning.', [_]), nl,
write('You put the wooden_torch back in the magic chest.'), !, nl.
use(golden_ring, guardian) :-
in_inventory(golden_ring),
i_am_at(boss_room),
retractall(at(guardian, boss_room)), retractall(locked(exit)), nl, nl,
write('> The Guardian says: "Yes, this shiny object will match my beautiful feathers.'), nl,
write(' Farewell, wise mage. You can move on to the Heart."'), nl,
write('> Brusto (in total disbelief) says: "We did it!"'), nl, sleep(10),
outro, !, nl.
use(Item, Wet) :-
hot(Item), wet(Wet),
in_inventory(Item),
i_am_at(Place), at(Wet, Place),
retractall(hot(Item)),
write('The '),
ansi_format([bold,fg(magenta)], '~w', [Item]),
write(' is no longer burning.'), nl,
write('You put it back in the magic chest.'), !, nl.
use(Item, Other) :-
in_inventory(Item), immovable(Other),
i_am_at(Place),
at(Other, Place),
retractall(in_inventory(Item)),
assert(at(Item, Other)),
write('You place a '),
ansi_format([bold,fg(magenta)], '~w', [Item]),
write(' in a '),
ansi_format([bold,fg(magenta)], '~w.', [Other]),
nl, fail.
% Checking solution when placing a torch in a torch holder.
use(torch, torch_holder) :- i_am_at(room_north), check_solution, !.
use(torch, wooden_torch_holder) :- i_am_at(room_south), check_solution, !.
use(wooden_torch, torch_holder) :- i_am_at(room_north), check_solution, !.
use(wooden_torch, wooden_torch_holder) :- i_am_at(room_south), check_solution, !.
/* Usage with placing items */
use(green_orb, green_bowl) :-
i_am_at(entrance),
at(green_orb, green_bowl),
write('It '),
ansi_format([bold,fg(yellow)], 'shines', [_]),
write(' brightly!'),
assert_shining(green_bowl), !, nl. % Assert shining also checks solution.
use(red_orb, red_bowl) :-
i_am_at(entrance),
at(red_orb, red_bowl),
write('It '),
ansi_format([bold,fg(yellow)], 'shines', [_]),
write(' brightly!'),
assert_shining(red_bowl), !, nl. % Assert shining also checks solution.
use(blue_orb, blue_bowl) :-
i_am_at(shed),
at(blue_orb, blue_bowl),
write('It '),
ansi_format([bold,fg(yellow)], 'shines', [_]),
write(' brightly!'),
assert_shining(blue_bowl), !, nl. % Assert shining also checks solution.
use(long_plank, pond) :-
i_am_at(pond_room),
at(long_plank, pond),
check_solution, !, nl.
use(Item, Other) :-
i_am_at(Place),
at(Other, Place),
at(Item, Other), nl,
write('Nothing seems to happen.'), nl,
write('Maybe something happened in the pocket dimension in your pocket watch,'), nl,
write('but you don''t have your pocket watch with you now, so you can''t check.'), !, nl.
use(Item, Other) :-
in_inventory(Item),
i_am_at(Place),
at(Other, Place), nl,
write('Nothing seems to happen.'), nl,
write('Maybe something happened in the pocket dimension in your pocket watch,'), nl,
write('but you don''t have your pocket watch with you now, so you can''t check.'), !, nl.
use(Item, _) :-
not(in_inventory(Item)),
write('You don''t have a '), write(Item), write(' in your bottomless chest.'), !, nl.
use(_, Other) :-
i_am_at(Place),
not(at(Other, Place)),
write('You don''t sense a '), write(Other), write(' here.'), !, nl.
/* -------------- Go to another room -------------- */
n :- go(n).
s :- go(s).
e :- go(e).
w :- go(w).
go(s) :-
i_am_at(pond_room),
locked(pond),
write('There''s no bridge here! You cannot fly (and probably'), nl,
write('swim, that would be too convenient), so you cannot pass.'), !, nl.
go(s) :-
i_am_at(boss_room),
locked(exit),
write('The Guardian is blocking the exit!'), !, nl.
go(w) :-
i_am_at(entrance),
locked(gate),
write('The gate is locked. You have to find a way to open it!'), !, nl.
go(w) :-
i_am_at(room_north),
locked(gateway),
write('This gateway is closed. You have to unlock it somehow...'), !, nl.
go(Direction) :-
i_am_at(Here),
path(Here, Direction, There),
retractall(i_am_at(Here)),
assert(i_am_at(There)),
!, tty_clear, look.
go(_) :-
write('You can''t go that way. Why? It doesn''t matter, take no interest.').
/* ------- Get a description of a place ------- */
look :-
i_am_at(Place),
describe(Place), nl,
notice_objects_at(Place), nl.
notice_objects_at(Place) :-
at(X, Place),
write('You sense a '),
ansi_format([bold,fg(magenta)], '~w', [X]),
write(' here.'), nl,
fail.
notice_objects_at(_).
/* ------ Get a description of an object ------ */
examine(Item) :-
i_am_at(Place),
at(Container, Place),
at(Item, Container),
nl, describe(Item),
print_status(Item), !.
examine(Item) :-
i_am_at(Place),
at(Item, Place),
nl, describe(Item),
notice_objects_at(Item),
print_status(Item), !.
examine(Item) :-
in_inventory(Item), nl, describe(Item),
write('You have this very magical artifact in your bottomless chest.'),
print_status(Item), !, nl.
examine(_) :-
write('You don''t sense the magic presence of this object here.'), !, nl.
/* ------ Print all of X's statuses ------ */
print_status(X) :-
shining(X), write('The '),
ansi_format([bold,fg(magenta)], '~w', [X]), write(' is'),
ansi_format([bold,fg(yellow)], ' shining', [_]),
write('! It gives you a good feeling.'), nl, fail.
print_status(pond) :-
write('The '),
ansi_format([bold,fg(magenta)], 'pond', [_]), write(' is'),
ansi_format([bold,fg(blue)], ' full of water', [_]), write('.'), nl, fail.
print_status(pond) :-
locked(pond), write('It is impossible to cross. Unless you want to drown.'), nl, !.
print_status(X) :-
locked(X), write('The '),
ansi_format([bold,fg(magenta)], '~w', [X]),
write(' is locked.'), nl, fail.
print_status(X) :-
cut(X), write('The '),
ansi_format([bold,fg(magenta)], '~w', [X]),
write(' is cut.'), nl, fail.
print_status(guardian) :-
print_hp, vulnerable(X), write('The '),
ansi_format([bold,fg(magenta)], 'Guardian', [_]), write(' is vulnerable to'),
ansi_format([bold,fg(yellow)], ' ~w', [X]), write('!'), !, nl.
print_status(blue_bowl) :-
wet(blue_bowl), write('The '),
ansi_format([bold,fg(magenta)], 'blue bowl', [_]), write(' is'),
ansi_format([bold,fg(blue)], ' full of water', [_]), write('.'), !, nl.
print_status(fountain) :-
wet(fountain), write('The '),
ansi_format([bold,fg(magenta)], 'fountain', [_]), write(' is'),
ansi_format([bold,fg(blue)], ' full of water', [_]), write('.'), !, nl.
print_status(fancy_fountain) :-
wet(fancy_fountain), write('The '),
ansi_format([bold,fg(magenta)], 'fancy fountain', [_]), write(' is'),
ansi_format([bold,fg(blue)], ' full of water', [_]), write('.'), !, nl.
print_status(X) :-
not(i_am_at(pond_room)), wet(X), write('The '),
ansi_format([bold,fg(magenta)], '~w', [X]), write(' is'),
ansi_format([bold,fg(blue)], ' wet', [_]), write('.'), !, nl.
print_status(X) :-
frozen(X), write('The '),
ansi_format([bold,fg(magenta)], '~w', [X]), write(' is'),
ansi_format([bold,fg(cyan)], ' frozen', [_]), write('.'), !, nl.
print_status(torch) :-
hot(torch), write('The '),
ansi_format([bold,fg(magenta)], 'torch', [_]), write(' is'),
ansi_format([bold,fg(red)], ' burning', [_]), write('.'), !, nl.
print_status(wooden_torch) :-
hot(wooden_torch), write('The '),
ansi_format([bold,fg(magenta)], 'wooden torch', [_]), write(' is'),
ansi_format([bold,fg(red)], ' burning', [_]), write('.'), !, nl.
print_status(red_bowl) :-
hot(red_bowl), write('The '),
ansi_format([bold,fg(magenta)], 'red bowl', [_]), write(' is'),
ansi_format([bold,fg(red)], ' burning', [_]), write('.'), !, nl.
print_status(X) :-
hot(X), write('The '),
ansi_format([bold,fg(magenta)], '~w', [X]), write(' is'),
ansi_format([bold,fg(red)], ' hot', [_]), write('.'), !, nl.
print_status(_) :-
!, nl.
/* ------------ All spell casts ------------ */
rain(X) :- cast(rain, X).
sunbeam(X) :- cast(sunbeam, X).
frost(X) :- cast(frost, X).
cast(_, X) :-
in_inventory(X),
write('> Brusto says: "You cannot use spells on items inside me!"'), !, nl.
cast(_, Creature) :-
alive(Creature),
write('The '), write(Creature), write(' looks at you disapprovingly.'), nl, fail.
/* ------------ Rain spell section ------------ */
cast(rain, blue_bowl) :-
i_am_at(shed),
retractall(hot(blue_bowl)),
retractall(frozen(blue_bowl)),
retractall(shining(blue_bowl)), % In case the same spell is used multiple times.
assert(wet(blue_bowl)),
write('You cast a rain spell on the blue bowl.'), nl,
write('The bowl fills with rainwater and it starts to '),
ansi_format([bold,fg(yellow)], 'shine', [_]),
write(' brightly.'),
assert_shining(blue_bowl), !, nl.
cast(rain, white_bowl) :-
i_am_at(entrance),
shining(white_bowl),
retractall(shining(white_bowl)),
write('The white bowl stops to shine. Maybe you did something wrong...'), nl, fail.
cast(rain, red_bowl) :-
i_am_at(entrance),
shining(red_bowl),
not(at(red_orb, red_bowl)),
hot(red_bowl),
retractall(shining(red_bowl)),
retractall(hot(red_bowl)),
assert(wet(red_bowl)),
write('The water from the rain extinguishes the fire in the red bowl. It stops to shine.'), nl,
write('Maybe you did something wrong...'), !, nl.
cast(rain, torch) :-
i_am_at(Place),
at(X, Place),
at(torch, X),
hot(torch),
retractall(hot(torch)),
write('The torch is no longer lit.'), check_solution, !, nl.
cast(rain, wooden_torch) :-
i_am_at(Place),
at(X, Place),
at(wooden_torch, X),
hot(wooden_torch),
retractall(hot(wooden_torch)),
write('The wooden_torch is no longer lit.'), check_solution, !, nl.
cast(rain, guardian) :-
vulnerable(water),
retractall(vulnerable(water)),
set_next_vulnerability,
decrement_hp,
check_solution, !.
cast(rain, guardian) :-
not(vulnerable(water)),
write('> Brusto says: "Oh no! Rain doesn''t work!'), nl,
write('Maybe you should try something else!"'), !, nl.
cast(rain, X) :-
i_am_at(Place),
at(X, Place),
hot(X),
retractall(hot(X)),
write('The '), write(X), write(' is no longer hot.'), !, nl.
cast(rain, X) :-
i_am_at(Place),
at(X, Place),
frozen(X),
retractall(frozen(X)),
write('The '), write(X), write(' is no longer frozen.'), !, nl.
cast(rain, fountain) :-
i_am_at(Place),
at(fountain, Place),
assert(wet(fountain)),
write('The fountain is '),
ansi_format([bold,fg(blue)], 'full of water', [_]),
write(' because of rain.'), check_solution, !, nl.
cast(rain, fancy_fountain) :-
i_am_at(Place),
at(fancy_fountain, Place),
assert(wet(fancy_fountain)),
write('The fancy fountain is '),
ansi_format([bold,fg(blue)], 'full of water', [_]),
write(' because of rain.'), check_solution, !, nl.
cast(rain, X) :-
i_am_at(Place),
at(X, Place),
assert(wet(X)),
write('The '), write(X), write(' is '),
ansi_format([bold,fg(blue)], 'wet', [_]),
write(' because of rain.'), !, nl.
/* ------------- Sunbeam spell section ----------------- */
cast(sunbeam, red_bowl) :-
i_am_at(entrance),
retractall(wet(red_bowl)),
retractall(frozen(red_bowl)),
retractall(shining(red_bowl)),
assert(hot(red_bowl)),
write('You cast a'),
ansi_format([bold,fg(red)], ' sunbeam ', [_]),
write('spell on the red bowl.'), nl,
write('Great, now it''s on fire. But also it '),
ansi_format([bold,fg(yellow)], 'shines', [_]),
write(' with its own light.'),
assert_shining(red_bowl), !, nl.
cast(sunbeam, white_bowl) :-
i_am_at(entrance),
retractall(shining(white_bowl)),
write('The white bowl stops to shine. Maybe you did something wrong...'), nl, fail.
cast(sunbeam, rope) :-
i_am_at(room_north),
not(cut(rope)),
assert(cut(rope)),
assert(hot(rope)),
write('The rope catches fire and after a while it is cut, or rather burned in two.'), nl,
write('Now it looks exactly like the rope in the south courtyard.'),
check_solution, !, nl.
cast(sunbeam, blue_bowl) :-
i_am_at(shed),
shining(blue_bowl),
wet(blue_bowl),
not(at(blue_orb, blue_bowl)),
retractall(shining(blue_bowl)),
retractall(wet(blue_bowl)),
write('The water evaporates and the blue bowl stops to shine.'), nl,
write('Maybe you did something wrong...'), !, nl.
cast(sunbeam, torch) :-
i_am_at(Place),
at(X, Place),
at(torch, X),
assert(hot(torch)),
write('The torch is now'),
ansi_format([bold,fg(red)], ' lit.', [_]), check_solution, !, nl.
cast(sunbeam, wooden_torch) :-
i_am_at(Place),
at(X, Place),
at(wooden_torch, X),
assert(hot(wooden_torch)), nl,
write('The wooden torch is now'),
ansi_format([bold,fg(red)], ' lit.', [_]), check_solution, !, nl.
cast(sunbeam, fancy_fountain) :-
i_am_at(room_north), frozen(fancy_fountain),
retractall(frozen(fancy_fountain)),
assert(wet(fancy_fountain)),
write('The water in the fancy fountain is no longer'),
ansi_format([bold,fg(cyan)], ' frozen.', [_]), check_solution, !, nl.
cast(sunbeam, fountain) :-
i_am_at(room_south), frozen(fountain),
retractall(frozen(fountain)),
assert(wet(fountain)),
write('The water in the fountain is no longer'),
ansi_format([bold,fg(cyan)], ' frozen.', [_]), check_solution, !, nl.
cast(sunbeam, guardian) :-
vulnerable(sun),
retractall(vulnerable(sun)),
set_next_vulnerability,
decrement_hp,
check_solution, !.
cast(sunbeam, guardian) :-
not(vulnerable(sun)),
write('> Brusto says: "Oh no! Sunbeam doesn''t work!'), nl,
write('Maybe you should try something else!"'), !, nl.
cast(sunbeam, pond) :-
i_am_at(pond_room), frozen(pond),
retractall(frozen(pond)),
write('The water in the pond is no longer frozen.'), !, nl.
cast(sunbeam, pond) :- % Cannot remove water from the pond.
i_am_at(pond_room),
write('The water in the pond is now hot.'), !, nl.
cast(sunbeam, X) :-
i_am_at(Place),
at(X, Place),
wet(X),
retractall(wet(X)),
write('The '), write(X), write(' is no longer wet.'), check_solution, !, nl.
cast(sunbeam, X) :-
i_am_at(Place),
at(X, Place),
frozen(X),
retractall(frozen(X)),
write('The '), write(X), write(' is no longer frozen.'), check_solution, !, nl.
cast(sunbeam, X) :-
i_am_at(Place),
at(X, Place),
assert(hot(X)),
write('The '), write(X), write(' is now'),
ansi_format([bold,fg(red)], ' hot.', [_]), !, nl.
/* ------------ Frost spell section ------------ */
cast(frost, white_bowl) :-
i_am_at(entrance),
retractall(shining(white_bowl)), % In case the same spell is used multiple times.
write('You use your white wand of frost on a white bowl. It '),
ansi_format([bold,fg(yellow)], 'shines', [_]),
write(' brightly!'),
assert_shining(white_bowl), nl, fail.
cast(frost, red_bowl) :-