-- License: BSD3 (see LICENSE)
-- Author: Dino Morelli <dino@ui3.info>

import Control.Monad
import Data.List.Split
import Data.Map ( lookup )
import Data.Maybe
import Network.CGI
import Prelude hiding ( lookup )
import System.FilePath ( (</>) )
--import Text.Printf  -- For debug log messages below

import Grolprep.Common.Conf
import Grolprep.Common.Log
import Grolprep.Web.Feedback
import Grolprep.Web.Session
import Grolprep.Web.Study


{- This is our main event entry point. All requests come through here.
-}
cgiMain :: App CGIResult
cgiMain = do
   haveSession <- liftM isJust getSession
   method <- requestMethod
   path <- pathInfo

   -- Sometimes need these to troubleshoot dispatching
   --llog DEBUG $ printf "haveSession: %s" $ show haveSession
   --llog DEBUG $ printf "method: %s  path: %s" method path

   dispatch haveSession method $ filter (/= "") $ splitOn "/" path


dispatch :: Bool -> String -> [String] -> App CGIResult
dispatch _     "GET"  ["feedback"]          = feedbackPage
dispatch _     "POST" ["feedback"]          = feedbackHandler
dispatch _     "GET"  ["study", "setup"]    = formSetup
dispatch _     "POST" ["study", "setup"]    = setupSession
dispatch _     "GET"  ["init"]              = initialize
dispatch False _      _                     = initialize
dispatch _     "POST" ["study", "problem"]  = evalProblem
dispatch _     _      ["study", "next"]     = evalPass
dispatch _     "POST" ["study", "psummary"] = prepareForNext
dispatch True  _      _                     = formProblem


main :: IO ()
main = do
   confMap <- parseToMap <$> (readFile $ "/etc" </> "grolprep.conf")
   let logPath = fromJust $ lookup "log-path" confMap
   let logPriority = read . fromJust $ lookup "log-priority" confMap

   initLogging logPath logPriority

   runApp confMap cgiMain