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{-# LANGUAGE OverloadedStrings #-}
import           Data.Monoid (mappend)
import           Hakyll
import           Data.List (sortBy, sortOn)
import           Data.Time (formatTime, defaultTimeLocale)


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main :: IO ()
main = hakyllWith defaultConfiguration $ do
    match "well-known/*" $ do
        route (customRoute (prepend '.'. toFilePath))
        compile copyFileCompiler

    match "images/*" $ do
        route   idRoute
        compile copyFileCompiler

    match "resources/*" $ do
        route   idRoute
        compile copyFileCompiler

    match "css/*" $ do
        route   idRoute
        compile compressCssCompiler

    match "js/*" $ do
        route   idRoute
        compile compressCssCompiler

    match (fromList ["index.markdown", "contact.markdown"]) $ do
        route   $ setExtension "html"
        compile $ pandocCompiler
            >>= loadAndApplyTemplate "templates/default.html" defaultContext
            >>= relativizeUrls



    match "templates/*" $ compile templateBodyCompiler

modFirst :: [Item a] -> Compiler [Item a]
modFirst = fmap reverse . modified
  where
    modified = sortByM (getItemModificationTime . itemIdentifier)
    sortByM f xs = map fst . sortOn snd <$> mapM (\x -> (,) x <$> f x) xs

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postCtx :: Context String
postCtx =
    dateField "date" "%B %e, %Y" `mappend`
    modifiedField "modified" "%B %e, %Y" `mappend`
    defaultContext
  where
    modifiedField key format = field key $ \i -> do
      time <- getItemModificationTime $ itemIdentifier i
      return $ formatTime defaultTimeLocale format time

prepend :: a -> [a] -> [a]
prepend = (:)