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module Reaktor.Utils where
import qualified Data.ByteString.Char8 as BS
import Data.Char (chr)
import Data.Char (isDigit)
import Reaktor.Types
import System.Random (getStdRandom, randomR)
nextNick :: Nickname -> Nickname
nextNick nick_ = nick'
where
splitNick s =
(prefix, maybe 0 fst (BS.readInt suffix))
where
prefix = BS.take (BS.length s - BS.length suffix) s
suffix = BS.reverse . BS.takeWhile isDigit . BS.reverse $ s
(nickPrefix, nickSuffix) = splitNick nick_
nick' = nickPrefix <> (BS.pack . show $ nickSuffix + 1)
randomNick :: IO Nickname
randomNick = do
h_chr <- getRandomChar nickhead
t_len <- getStdRandom (randomR (4,8)) :: IO Int
t_str <- mapM (const $ getRandomChar nicktail) [1..t_len]
return $ BS.pack (h_chr:t_str)
where
getRandomChar cs = (cs!!) <$> getStdRandom (randomR (0, length cs - 1))
nickhead = letters <> specials
nicktail = letters <> digits <> specials <> minus
letters = map chr $ [0x41..0x5A] <> [0x61..0x7A]
digits = map chr $ [0x30..0x39]
specials = map chr $ [0x5B..0x60] <> [0x7B..0x7D]
minus = map chr $ [0x2D]
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