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module Pai where
import Data.Char (toUpper)
import Data.List (sort)
import Data.Maybe
import Control.Monad
data MCol = Man | Pin | Sou | Cha
deriving (Eq,Ord)
data MCard = MCard MCol Int
deriving (Eq,Ord)
charMcol = [(Man,'M'),(Pin,'P'),(Sou,'S'),(Cha,'C')]
instance Show MCol where
show x = [snd a | a <-charMcol, fst a == x]
instance Read MCol where
readsPrec p r = [(fst a,t)|(c,t) <- lex r, a <- charMcol, map toUpper c == [snd a]]
instance Show MCard where
show (MCard a b) = show b ++ show a
instance Read MCard where
readsPrec p r = [ (MCard col n,u) | (c1,t)<- lex r,
let n = (read c1)::Int,
(c2,u) <-lex t,
let col=(read c2)::MCol]
isCha c@(MCard col n) = (col == Cha)
isLaoTou c@(MCard col n) = ((n == 1) || (n == 9)) && (not $ isCha c)
is19 c@(MCard col n) = (isCha c) || (isLaoTou c)
orderedPai = sort $ [MCard c n | c<-[Man,Pin,Sou], n <-[1..9]] ++ (map (MCard Cha) [1..7])
nextPai p = if xs /= [] then Just $ head xs
else Nothing
where (x:xs) = dropWhile (/= p) orderedPai
nextPai' p@(MCard c n) = do
nx <- nextPai p
guard ((c /= Cha) && (n /= 9))
return nx
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