{-# LANGUAGE NamedFieldPuns, QuasiQuotes #-}


import Hack.Handler.Happstack
import System (getArgs)
import MPS.Env hiding (div, log)
import MPS.TH
import MPS.Extra (u2b, b2u, strip, purify)
import MPSUTF8 (ls)
import Prelude ()
import Data.Default (def)
import Hack.Contrib.Middleware.Config
import Hack.Contrib.Middleware.ContentLength
import Hack.Contrib.Middleware.Static
import Hack.Contrib.Middleware.SimpleAccessLogger
import Hack.Contrib.Middleware.UserMime
-- import Hack.Contrib.Mime
-- import Data.Map (toAscList)
import Hack.Contrib.Utils (use, unescape_uri)
import Hack.Contrib.Response (set_content_type)
import Hack.Contrib.Request (path)
import Hack
import Data.ByteString.Lazy.Char8 (pack)
import System.Posix.Files
import Data.List (isInfixOf, sort)
import Text.HTML.Moe hiding ((/), body, head, select)
import Control.Monad ((>=>))
import System.Process
import System.Directory (doesFileExist)
import Control.Concurrent
import Control.Arrow ((&&&))



main :: IO ()
main = do
  args <- getArgs
  let { port = 
    if length args == 0
      then 3000
      else read - head args
    }
  
  let { app =
    dir_serve - \env -> do
      let static_app = static (Just ".") [""] (const - return not_found)
      
      r <- static_app env
      if r.status == 200
        then do
          _content_type <- readProcess "file" ["-b", "--mime", "." + env.pathInfo.unescape_uri] ""
          -- putStrLn _content_type
          return - r.set_content_type (_content_type.strip)
        else
          return r          
    }

  maid_mime_exist <- doesFileExist "mime.types"
    
  mime_types <- if maid_mime_exist then readFile "mime.types" else return default_mime_types

  putStrLn ""
  putStrLn - " ❂ Maid serving on port: " ++ show port
  putStrLn ""
  
  runWithConfig def {port} - use (middleware_stack mime_types) app
  -- run port - use middleware_stack app
  
  where
    dir_serve app = cascade
      [
        app
      , config (\env -> env {pathInfo = pathInfo env / "index.htm"}) app
      , config (\env -> env {pathInfo = pathInfo env / "index.html"}) app
      , list_dir
      ]


log :: String -> IO ()
log x = jailed - putStrLn - b2u - x
  where
    
    sync_lock :: MVar ()
    sync_lock = purify - newMVar ()

    jailed :: IO a -> IO a
    jailed io = do
      withMVar sync_lock (const io)


middleware_stack :: String -> [Middleware]
middleware_stack mime_types =
  [
    no_favicon
  , content_length
  , simple_access_logger - Just log
  , user_mime - parse_user_mines mime_types
  -- , user_mime - mime_types.toAscList.map_fst (drop 1)
  -- , \app env -> do
  --   r <- app env
  --   print - r.headers
  --   return r
  ]
  
  where
    parse_user_mines :: String -> [(String, String)]
    parse_user_mines = lines > reject null > map (words > head &&& words > tail > unwords)

cascade :: [Application] -> Application
cascade [] = const - return not_found
cascade (x:xs) = \env -> do
  r <- x env
  if r.status == 404
    then
      cascade xs env
    else
      return r


no_favicon :: Middleware
no_favicon app = \env -> do
  -- putStrLn - "pathInfo is: " + env.pathInfo
  if env.pathInfo.is "/favicon.ico"
    then
      return not_found
    else
      app env

not_found :: Response
not_found = def { status = 404 }

is_directory :: String -> IO Bool
is_directory = u2b > getFileStatus >=> isDirectory > return

list_dir :: Application
list_dir env = do
  let _path = "." + env.pathInfo .unescape_uri .b2u
  
  -- print _path
  
  -- no hack please
  if ".." `isInfixOf` _path
    then
      return not_found
    else do
      is_dir <- is_directory _path
      
      if not is_dir
        then
          return not_found
        else do
          _paths <- ls _path

          -- print _paths
        
          let _full_paths = _paths.map (_path.drop 2 /)
          
          dir_tags <- _full_paths.mapM is_directory

          let tagged = zip _paths dir_tags
          
              dirs = tagged.select snd.sort .map_fst (+ "/")
              files =  tagged.reject snd.sort 

              sorted = dirs + files
          
          maid_css_exist <- doesFileExist "maid.css"
          
          css <- if maid_css_exist then readFile "maid.css" else return default_css_style
            
          
          return - def
            {
              status = 200
            , body = pack - dir_template sorted css (env.path.unescape_uri.b2u)
            }
            .set_content_type "text/html; charset=utf-8"


dir_template :: [(String, Bool)] -> String -> String -> String
dir_template xs css current_path = render -
  html' - do
    head' - do
      meta [http_equiv "Content-Type", content "text/html; charset=utf-8"]
      style' - str css
    body' - do
      div [_class "container"] - do
        ul' - do
          xs.mapM_ (\(path, dir_tag) ->
            li' - do
              
              let path_dom = a [href - "/" / current_path / path] - str - path
                
              if dir_tag
                then
                  div [_class "directory"] -
                    path_dom
                else
                  path_dom
            )
          


default_css_style :: String
default_css_style = [$here|

body {
line-height: 1.5em;
font-size: 1.3em;
}

  .directory a
, .directory a:visited {
color: grey;
}

  a
, a:visited {
text-decoration: none;
color: #222;
display: block;
background: #eee;
padding: 3px;
padding-left: 20px;
}

a:hover {
background: #ccc;
}

li {
list-style-type: none;

width: 80%;
margin: 5px;
}


|]


default_mime_types :: String
default_mime_types = [$here|

hs text/plain; charset=utf-8
lhs text/plain; charset=utf-8

|]