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{-# LANGUAGE OverloadedStrings #-}
import Data.Monoid (mappend)
import Hakyll
import Data.List (sort)
-- import Data.Maybe (fromMaybe)
-- import System.FilePath (takeBaseName)
import System.FilePath (takeFileName)
--------------------------------------------------------------------------------
main :: IO ()
main = hakyll $ do
    match "images/*" $ do
        route   idRoute
        compile copyFileCompiler

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

    match "posts/*" $ do
        route $ setExtension "html"
        compile $ pandocCompiler
            >>= loadAndApplyTemplate "templates/post.html"    postCtx
            >>= loadAndApplyTemplate "templates/default.html" postCtx
            >>= relativizeUrls

    create ["archive.html"] $ do
        route idRoute
        compile $ do
            posts <- recentFirst =<< loadAll "slides/*"
            let archiveCtx =
                    listField "posts" postCtx (return posts) `mappend`
                    constField "title" "Archives"            `mappend`
                    defaultContext
            makeItem ""
                >>= loadAndApplyTemplate "templates/archive.html" archiveCtx
                >>= loadAndApplyTemplate "templates/default.html" archiveCtx
                >>= relativizeUrls

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

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

    match "templates/*" $ compile templateBodyCompiler

    match "slides/*" $ do
        route $ setExtension "html"
        compile $ pandocCompiler
            >>= loadAndApplyTemplate "templates/slideTemp.html" slideCtx
            >>= loadAndApplyTemplate "templates/default.html" slideCtx
            >>= relativizeUrls


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

slideCtx :: Context String
slideCtx =
    field "prevSlide" $ \item -> do
        metadata <- getMetadata (itemIdentifier item)
        return $ maybe "" id $ lookupString "prevSlide" metadata
    `mappend`
    field "nextSlide" $ \item -> do
        metadata <- getMetadata (itemIdentifier item)
        return $ maybe "" id $ lookupString "nextSlide" metadata
    `mappend`
    defaultContext