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{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
-- | module defining Badge types and utility functions
module Badges where
import Data.Aeson (Options (fieldLabelModifier, sumEncoding),
SumEncoding (UntaggedValue), ToJSON (toJSON),
defaultOptions, genericToJSON, (.=))
import qualified Data.Aeson as A
import Data.Char (toLower)
import Data.Text (Text)
import GHC.Generics (Generic)
import Text.Regex.TDFA ((=~))
data BadgeArea =
BadgePoint
{ areaX :: Double
, areaY :: Double
}
| BadgeRect
{ areaX :: Double
, areaY :: Double
, areaWidth :: Double
, areaHeight :: Double
}
deriving (Ord, Eq, Generic, Show)
newtype BadgeToken = BadgeToken Text
deriving (Eq, Ord, Show)
instance ToJSON BadgeArea where
toJSON = genericToJSON defaultOptions
{ fieldLabelModifier = drop 4 . map toLower
, sumEncoding = UntaggedValue }
instance ToJSON BadgeToken where
toJSON (BadgeToken text) = toJSON text
parseToken :: Text -> Maybe BadgeToken
parseToken text = if text =~ ("^[a-zA-Z0-9]{50}$" :: Text)
then Just (BadgeToken text)
else Nothing
data Badge = Badge BadgeToken BadgeArea
deriving (Ord, Eq, Generic, Show)
instance ToJSON Badge where
toJSON (Badge token area) = A.object $ case area of
BadgePoint x y -> [ "x" .= x
, "y" .= y
, "token" .= token
, "type" .= A.String "point"
]
BadgeRect {..} -> [ "x" .= areaX
, "y" .= areaY
, "token" .= token
, "width" .= areaWidth
, "height" .= areaHeight
, "type" .= A.String "rectangle"
]
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