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-module(shr_roll).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-export
(
[
percentage/0,
between/2,
percentage_with_luck/2,
conflict_with_luck/3
]
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec between (non_neg_integer(), non_neg_integer()) -> non_neg_integer().
between (Min, Max) ->
Diff = (Max - Min),
(Min + (rand:uniform(Diff + 1) - 1)).
-spec percentage () -> 0..100.
percentage () ->
between(0, 100).
-spec percentage_with_luck
(
non_neg_integer(),
integer()
)
-> {0..100, boolean(), integer()}.
percentage_with_luck (Target, Luck) ->
BaseRoll = percentage(),
ModedRoll = max(0, min((BaseRoll - Luck), 100)),
IsSuccess = (ModedRoll =< Target),
NewLuck =
case {IsSuccess, (Target > 50)} of
{true, true} ->
% Succeeded, was likely to succeed.
% Only pay what was used.
MissingPoints = max(0, (BaseRoll - Target)),
(Luck - MissingPoints);
{true, false} ->
% Succeeded, was unlikely to succeed.
% Pay a lot!
MissingPoints = (55 - Target),
(Luck - MissingPoints);
{false, true} ->
% Failure due to bad roll.
% Was likely to succeed, you get a lot!
OwedPoints = (Target - 45),
(Luck + OwedPoints);
_ -> Luck
end,
{ModedRoll, IsSuccess, NewLuck}.
-spec conflict_with_luck
(
non_neg_integer(),
integer(),
integer()
)
-> {0..100, boolean(), integer(), integer()}.
conflict_with_luck (Target, LuckA, LuckB) ->
BaseRoll = percentage(),
ModedRoll = max(0, min((BaseRoll - (LuckA - LuckB)), 100)),
IsSuccess = (ModedRoll =< Target),
{NewLuckA, NewLuckB} =
case {IsSuccess, (Target > 50)} of
{true, true} ->
% Succeeded, was likely to succeed.
% Only pay what was used.
MissingPoints = max(0, (BaseRoll - Target)),
{(LuckA - MissingPoints), LuckB};
{true, false} ->
% Succeeded, was unlikely to succeed.
% Pay a lot!
MissingPoints = (55 - Target),
{(LuckA - MissingPoints), (LuckB + MissingPoints)};
{false, true} ->
% Failure due to bad roll.
% Was likely to succeed, you get a lot!
OwedPoints = (Target - 45),
{(LuckA + OwedPoints), (LuckB - OwedPoints)};
_ -> {LuckA, LuckB}
end,
{ModedRoll, IsSuccess, NewLuckA, NewLuckB}.
|
