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module Chelleport.KeySequence where
import Chelleport.Types (KeyGrid, KeySequence)
import Chelleport.Utils (findWithIndex, uniq)
import Control.Monad (guard)
import Data.List (isPrefixOf)
import qualified Data.Map as Map
import qualified SDL
nextChars :: KeySequence -> KeyGrid -> Maybe [Char]
nextChars keySequence cells =
case matches of
[] -> Nothing
_ -> Just nextCharactersInSequence
where
matches = concatMap (filter $ isPrefixOf keySequence) cells
nextCharactersInSequence = uniq $ concatMap (take 1 . drop (length keySequence)) matches
findMatchPosition :: KeySequence -> KeyGrid -> Maybe (Int, Int)
findMatchPosition keySequence = findWithIndex searchRows 0
where
searchRows = fmap fst . findWithIndex searchInRow 0
searchInRow = guard . (== keySequence)
isValidKey :: SDL.Keycode -> Bool
isValidKey = (`Map.member` keycodeMapping)
-- Linear Congruential Generator
lcg :: Int -> Int
lcg seed = (a * seed + c) `mod` fromIntegral m
where
a = 1664525
c = 1013904223
m = (2 :: Integer) ^ (32 :: Integer)
getIndexRounded :: Int -> [a] -> a
getIndexRounded i ls = ls !! (i `mod` length ls)
generateGrid :: Int -> (Int, Int) -> KeySequence -> Maybe KeyGrid
generateGrid seed (rows, columns) hintKeys
| rows * columns > length hintKeys * length hintKeys = Nothing
| otherwise = Just $ (\row -> getKeySeq row <$> [0 .. columns - 1]) <$> [0 .. rows - 1]
where
allKeySeq = take numPairs . uniq $ generatePairs
numPairs = rows * columns
getKeySeq row col = allKeySeq !! (row * columns + col)
randomNumbers = iterate lcg seed
generatePairs =
[ [getIndexRounded i hintKeys, getIndexRounded j hintKeys]
| (i, j) <- zip randomNumbers (drop numPairs randomNumbers)
]
toKeyChar :: SDL.Keycode -> Maybe Char
toKeyChar = (`Map.lookup` keycodeMapping)
keycodeMapping :: Map.Map SDL.Keycode Char
keycodeMapping =
Map.fromList
[ (SDL.KeycodeA, 'A'),
(SDL.KeycodeB, 'B'),
(SDL.KeycodeC, 'C'),
(SDL.KeycodeD, 'D'),
(SDL.KeycodeE, 'E'),
(SDL.KeycodeF, 'F'),
(SDL.KeycodeG, 'G'),
(SDL.KeycodeH, 'H'),
(SDL.KeycodeI, 'I'),
(SDL.KeycodeJ, 'J'),
(SDL.KeycodeK, 'K'),
(SDL.KeycodeL, 'L'),
(SDL.KeycodeM, 'M'),
(SDL.KeycodeN, 'N'),
(SDL.KeycodeO, 'O'),
(SDL.KeycodeP, 'P'),
(SDL.KeycodeQ, 'Q'),
(SDL.KeycodeR, 'R'),
(SDL.KeycodeS, 'S'),
(SDL.KeycodeT, 'T'),
(SDL.KeycodeU, 'U'),
(SDL.KeycodeV, 'V'),
(SDL.KeycodeW, 'W'),
(SDL.KeycodeX, 'X'),
(SDL.KeycodeY, 'Y'),
(SDL.KeycodeZ, 'Z'),
(SDL.Keycode0, '0'),
(SDL.Keycode1, '1'),
(SDL.Keycode2, '2'),
(SDL.Keycode3, '3'),
(SDL.Keycode4, '4'),
(SDL.Keycode5, '5'),
(SDL.Keycode6, '6'),
(SDL.Keycode7, '7'),
(SDL.Keycode8, '8'),
(SDL.Keycode9, '9')
]
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