-- | (Un)picklers for data types present in The Sports Network XML
--   feed.
--
module TSN.Picklers (
  xp_date,
  xp_time )
where

-- System imports.
import Data.Time.Clock ( UTCTime )
import Data.Time.Format ( formatTime, parseTime )
import System.Locale ( defaultTimeLocale )
import Text.XML.HXT.Arrow.Pickle (
  xpText,
  xpWrapMaybe )
import Text.XML.HXT.Arrow.Pickle.Xml ( PU )


-- | (Un)pickle a UTCTime without the time portion.
--
xp_date :: PU UTCTime
xp_date =
  (to_date, from_date) `xpWrapMaybe` xpText
  where
    format = "%-m/%-d/%Y"

    to_date :: String -> Maybe UTCTime
    to_date = parseTime defaultTimeLocale format

    from_date :: UTCTime -> String
    from_date = formatTime defaultTimeLocale format


-- | (Un)pickle a UTCTime without the date portion.
--
xp_time :: PU UTCTime
xp_time =
  (to_time, from_time) `xpWrapMaybe` xpText
  where
    format = "%I:%M %p"

    to_time :: String -> Maybe UTCTime
    to_time = parseTime defaultTimeLocale format

    from_time :: UTCTime -> String
    from_time = formatTime defaultTimeLocale format