{- |
   Module     : Shakebook.Mustahce
   Copyright  : Copyright (C) 2020 Daniel Firth
   Maintainer : Daniel Firth <dan.firth@homotopic.tech
   License    : MIT
   Stability  : experimental

Utilities from "Slick.Mustache" lifted to `MonadAction` and `FileLike`.
-}

module Shakebook.Mustache (
  Text.Mustache.Template
, buildPageAction
, buildPageAction'
, compileTemplate'
) where

import           Composite.Aeson
import           Composite.Record
import           Data.Aeson
import           Development.Shake.Plus hiding ((:->))
import           GHC.TypeLits           (KnownSymbol)
import           RIO
import qualified RIO.Text               as T
import qualified Slick.Mustache
import           Text.Mustache

-- | Lifted version of `Slick.Mustache.compileTemplate'` with well-typed `Path`.
compileTemplate' :: MonadAction m => Path b File -> m Template
compileTemplate' = liftAction . Slick.Mustache.compileTemplate' . toFilePath

-- | Build a single page straight from a template.
buildPageAction :: MonadAction m
                => Path b File -- ^ The HTML templatate.
                -> Value -- ^ A JSON value.
                -> Path b' File -- ^ The out filepath.
                -> m ()
buildPageAction template value out = do
  pageT <- compileTemplate' template
  writeFile' out $ substitute pageT value

buildPageAction' :: (MonadAction m, MonadThrow m, KnownSymbol s) => Path Rel Dir -> (s :-> xs) -> JsonFormat e xs -> Path b File -> m ()
buildPageAction' d xs f o = do
              let (t, v) = valWithName xs
              t' <- parseRelFile $ T.unpack t
              buildPageAction (d </> t') (toJsonWithFormat f v) o