module Git.CommitHash
  ( CommitHash (..),
    toShortText,
    toText,
    toTextUnsafe,
  )
where

import Data.Binary (Binary)
import Data.Maybe (fromMaybe)
import Data.Text qualified as T
import GHC.Generics (Generic)
import Render qualified as P

data CommitHash
  = WorkingTree
  | Commit T.Text
  deriving (Eq, Show, Binary, Generic)

toShortText :: CommitHash -> Maybe T.Text
toShortText = fmap (T.take 7) . toText

toText :: CommitHash -> Maybe T.Text
toText WorkingTree = Nothing
toText (Commit hash) = Just hash

toTextUnsafe :: CommitHash -> T.Text
toTextUnsafe (Commit hash) = hash
toTextUnsafe _ = error "toTextUnsafe: WorkingDir"

instance P.Render CommitHash where
  render = P.render . P.Detailed

instance P.Render (P.Detailed CommitHash) where
  render (P.Detailed commitHash) =
    P.styled [P.color P.Yellow] $
      P.render (fromMaybe "<dirty>" (toText commitHash))

instance P.Render (P.Summarized CommitHash) where
  render (P.Summarized commitHash) =
    P.styled [P.color P.Yellow] $
      P.render (fromMaybe "<dirty>" (toShortText commitHash))