{-# LANGUAGE OverloadedStrings #-}
import System.FilePath.Posix
import Hakyll


main :: IO ()
main = hakyll $ do
  match "favicon.ico" $ do
    route idRoute
    compile copyFileCompiler
  match "css/*" $ do
    route idRoute
    compile compressCssCompiler
  match "images/*" $ do
    route   idRoute
    compile copyFileCompiler
  match "static/**/*" $ do
    route   idRoute
    compile copyFileCompiler
  match "fonts/*" $ do
    route   idRoute
    compile copyFileCompiler
  match "root/*" $ do
    route $ dropPrefix "root/"
    compile copyFileCompiler

  match "pastebin/*" $ do
    route $ setExtension "html"
    compile $ pandocCompiler
      >>= loadAndApplyTemplate "templates/pastebin.html" pastebinCtx
      >>= saveSnapshot "content"
      >>= loadAndApplyTemplate "templates/default.html"  pastebinCtx
      >>= relativizeUrls

  match "posts/*" $ do
    route $ setExtension "html"
      `composeRoutes` dropPrefix "posts/"
      `composeRoutes` dateFolders
    compile $ pandocCompiler
      >>= loadAndApplyTemplate "templates/post.html"    postCtx
      >>= saveSnapshot "content"
      >>= loadAndApplyTemplate "templates/default.html" postCtx
      >>= relativizeUrls

  match "pages/*" $ do
    route $ setExtension "html"
      `composeRoutes` dropPrefix "pages/"
    compile $ pandocCompiler
        >>= loadAndApplyTemplate "templates/default.html" defaultContext
        >>= relativizeUrls

  match "pastebins.html" $ do
    route idRoute
    compile $ do
      pastebins <- recentFirst =<< loadAll "pastebin/*"
      let pastebinCtx =
            listField "pastebins" pastebinCtx (return pastebins) `mappend`
            defaultContext

      getResourceBody
        >>= applyAsTemplate pastebinCtx
        >>= loadAndApplyTemplate "templates/default.html" pastebinCtx
        >>= relativizeUrls

  match "index.html" $ do
    route idRoute
    compile $ do
      posts <- recentFirst =<< loadAll "posts/*"
      let indexCtx =
            listField "posts" postCtx (return posts) `mappend`
            constField "title" "Home"                `mappend`
            defaultContext

      getResourceBody
        >>= applyAsTemplate indexCtx
        >>= loadAndApplyTemplate "templates/default.html" indexCtx
        >>= relativizeUrls

  create ["atom.xml", "feed.xml"] $ do
    route idRoute
    compile $ do
      loadAllSnapshots "posts/*" "content"
        >>= recentFirst
        >>= renderAtom feedConfiguration feedCtx

  create ["rss.xml"] $ do
    route idRoute
    compile $ do
        let feedCtx = postCtx `mappend`
                constField "description" "This is the post description"

        posts <- recentFirst =<< loadAll "posts/*"
        renderRss feedConfiguration feedCtx posts

  match "templates/*" $ compile templateBodyCompiler


postCtx :: Context String
postCtx =
    dateField "date" "%B %e, %Y" `mappend`
    defaultContext

pastebinCtx :: Context String
pastebinCtx = postCtx

feedCtx :: Context String
feedCtx =
    bodyField "description" `mappend`
    defaultContext

feedConfiguration :: FeedConfiguration
feedConfiguration = FeedConfiguration
    { feedTitle       = "EuAndreh"
    , feedDescription = "EuAndreh's blog"
    , feedAuthorName  = "EuAndreh"
    , feedAuthorEmail = "eu@euandre.org"
    , feedRoot        = "https://euandre.org"
    }

dropPrefix :: String -> Routes
dropPrefix prefix = gsubRoute prefix $ const ""

dateFolders :: Routes
dateFolders =
    gsubRoute "[0-9]{4}-[0-9]{2}-[0-9]{2}-" $ replaceAll "-" (const "/")