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import Text.CSV
import Text.Printf (printf)
import Data.List (sort, isPrefixOf, groupBy)
import System.Environment (getArgs)
normAndInvertAmount :: Field -> Field
normAndInvertAmount amt | amt == "" = ""
| otherwise = printf "%.2f" (0 - (read amt :: Double))
compressWhitespace :: String -> String
compressWhitespace x = map head $ groupSpaces x
where groupSpaces "" = [""]
groupSpaces x = groupBy (\x y -> x==' ' && y==' ') x
massageAmount :: [Field] -> [Field]
massageAmount [a,b,c,d,e,f,g,h,i,j] = [a,b,c,d,compressWhitespace e,f,g,h,i,normAndInvertAmount j]
-- massageAmount [a,b,c,d,e,f,g,h] = [a,b,compressWhitespace c,d,e,f,g,normAndInvertAmount h]
massageAmount xs = xs
sanitySort :: [Record] -> [Record]
sanitySort ts = map (massageAmount) (sort ts)
main = do
args <- getArgs
result <- parseCSVFromFile (head args)
case result of
Left e -> putStrLn ("Parse fail: " ++ show e)
Right ts -> putStrLn $ printCSV (sanitySort ts)
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