----------------------------------------------------------------------
--
-- Module      :   check the md files 
----------------------------------------------------------------------
{-# LANGUAGE OverloadedStrings #-}
-- {-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -Wall #-}

module Lib.CheckProcess where

import UniformBase
import ShakeBake.ReadSettingFile  
import Foundational.SettingsPage
import System.Directory.Recursive
import Uniform.Pandoc
-- import Foundational.Filetypes4sites  
-- import Wave.Md2doc 
import Foundational.MetaPage 
-- import Control.Exception
-- import Control.DeepSeq
import Data.Char

checkProcess :: NoticeLevel -> Path Abs File-> ErrIO ()
{- ^ the top call to check the md files. first collect all the filenames
-}
checkProcess debug sitefn = do
    when (inform debug) $ putIOwords ["checkProcess", "start"]
    sett3 <- readSettings debug (sitefn)
    let doughP = doughDir (siteLayout sett3)
    when (inform debug) $ putIOwords ["checkProcess 1", "doughP", showPretty doughP]

    -- get all md files in doughP 
    fns :: [FilePath] <- callIO $ getDirRecursive (toFilePath doughP) 

    when (inform debug) $ putIOwords ["checkProcess 1", "fns", showT . take 10 $ fns]

    let mds = filter (hasExtension "md") fns 
    -- let mds = filter (hasExtension extMD) fns -- TODO 
    
    when (inform debug) $ putIOwords ["checkProcess 2", "mds", showT . take 10 $ mds]

    let mds1 = mds -- filter (notDNB (siteLayout sett3)) mds
    when (inform debug) $ putIOwords ["checkProcess 2", "mds1", showT . take 10 $ mds1]
    let mds2 = map makeAbsFile mds1
    -- let hpname = blogAuthorToSuppress.storag sett3

    mapM_ (checkOneMD debug ) mds2 

    when (inform debug) $ putIOwords ["checkProcess", "end"]
    return ()



checkOneMD:: NoticeLevel ->  Path Abs File -> ErrIO ()
-- check one md file (only the yaml head) for necessary values 
checkOneMD debug  fnin  =
    
    ( do
        when (inform debug) $ putIOwords ["checkOneMD fnin", showPretty fnin]
        -- same setup as Startdainoprocess 
        currDir :: Path Abs Dir  <- currentDir 
        let settfn =  currDir </> settingsFileName

        sett3 <- readSettings debug settfn 

        -- (Docrep y1 _) <- readMarkdownFile2docrep debug doughP fnin
        -- copied from md2doc.hs
        -- mdfile <- read8 fnin markdownFileType 
        -- pd <- readMarkdown2 mdfile
        
        -- let doughP = doughDir (siteLayout sett3)
        -- let doughP = makeAbsDir "/home/frank/Workspace11/daino/docs/site/dough/"
                -- is not used 
        mdfile <- read8 fnin markdownFileType 
        pd <- readMarkdown2 mdfile

        when (inform debug) $ putIOwords ["checkOneMD 1"]
        y1 <- check_readMeta debug sett3 fnin  pd 

        when (inform debug) $ putIOwords ["checkOneMD 2", "metapage", showPretty  y1]

        when (inform debug) $ putIOwords ["checkOneMD", "done"]
        return ()
    )
    `catchError` (\e -> do
        putIOwords ["checkOneMD", "discovered error in file", showT fnin]
        -- putIOwords ["the yaml head is read as:", showPretty y1]
        putIOwords ["the error msg is:", e ] -- showT (e :: SomeException)]
        return () 
        )

check_readMeta:: NoticeLevel -> Settings ->  Path Abs File -> Pandoc -> ErrIO  MetaPage
check_readMeta debug sett3 fnin  pd = 
    (do 
        when (inform debug) $ putIOwords ["check_readMeta 1"]

        let meta6 = pandoc2MetaPage sett3 fnin  pd
        when (inform debug) $ putIOwords ["check_readMeta 2", "metapage", showPretty  meta6]    

        -- let y2 = meta6
        -- return y2
        let ll = sum .  map ord . show $ meta6
        -- y2 <- liftIO $ do 
            -- putStr .   show $ ll  
            -- let y3 =   deepseq ll y1
        -- output is necessary to force evaluation - deepseq seems not to do it
        putIOwords [showT  ll]
        return meta6
      )

-- catch error is never reached. problem is in pure code (pandoc2meta)
-- discovered when output is forced 
--   `catchError` (\e -> do 
--             putIOwords ["\n\ncheck_readMeta", "discovered error in file", showT fnin]
--             -- putIOwords ["the yaml head is read as:", showPretty y1]
--             putIOwords ["the error msg is:", showT (e :: SomeException), "\n"]
--             return zero 
--             )