{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE Rank2Types #-}
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE ScopedTypeVariables #-}

module Hack2.Interface.Wai 
(
  hackAppToWaiApp
) where

import Prelude ()
import Air.Env hiding (def, Default)

import qualified Network.Wai as Wai
import Hack2
import Data.Default (def, Default)
import qualified Network.HTTP.Types as HTTPTypes
import qualified Data.CaseInsensitive as CaseInsensitive
import Data.ByteString.Char8 (ByteString, pack)
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Lazy.Char8 as Lazy

import qualified Safe as Safe

{-

{  requestMethod  :: RequestMethod
,  scriptName     :: ByteString
,  pathInfo       :: ByteString
,  queryString    :: ByteString
,  serverName     :: ByteString
,  serverPort     :: Int
,  httpHeaders    :: [(ByteString, ByteString)]
,  hackVersion    :: (Int, Int, Int)
,  hackUrlScheme  :: HackUrlScheme
,  hackInput      :: HackEnumerator
,  hackErrors     :: HackErrors
,  hackHeaders    :: [(ByteString, ByteString)]

-}
requestToEnv :: Wai.Request -> Env
requestToEnv request = def
  {
    requestMethod  = request.Wai.requestMethod.show.upper.Safe.readDef GET
  , pathInfo       = request.Wai.rawPathInfo 
  , queryString    = request.Wai.rawQueryString.B.dropWhile (is '?')
  , serverName     = request.Wai.serverName
  , serverPort     = request.Wai.serverPort
  , httpHeaders    = request.Wai.requestHeaders.map caseInsensitiveHeaderToHeader
  , hackUrlScheme  = if request.Wai.isSecure then HTTPS else HTTP
  , hackHeaders    = [("RemoteHost", request.Wai.remoteHost.show.pack)]
  }
  

caseInsensitiveHeaderToHeader :: (CaseInsensitive.CI ByteString, ByteString) -> (ByteString, ByteString)
caseInsensitiveHeaderToHeader (x, y) = (x.CaseInsensitive.original, y) 

headerToCaseInsensitiveHeader ::  (ByteString, ByteString) -> (CaseInsensitive.CI ByteString, ByteString)
headerToCaseInsensitiveHeader (x, y) = (x.CaseInsensitive.mk, y) 

statusToStatusHeader :: Int -> HTTPTypes.Status
statusToStatusHeader 200 = HTTPTypes.status200
statusToStatusHeader 201 = HTTPTypes.status201
statusToStatusHeader 206 = HTTPTypes.status206
statusToStatusHeader 301 = HTTPTypes.status301
statusToStatusHeader 302 = HTTPTypes.status302
statusToStatusHeader 303 = HTTPTypes.status303
statusToStatusHeader 304 = HTTPTypes.status304
statusToStatusHeader 400 = HTTPTypes.status400
statusToStatusHeader 401 = HTTPTypes.status401
statusToStatusHeader 403 = HTTPTypes.status403
statusToStatusHeader 404 = HTTPTypes.status404
statusToStatusHeader 405 = HTTPTypes.status405
statusToStatusHeader 412 = HTTPTypes.status412
statusToStatusHeader 416 = HTTPTypes.status416
statusToStatusHeader 500 = HTTPTypes.status500
statusToStatusHeader 501 = HTTPTypes.status501
statusToStatusHeader 502 = HTTPTypes.status502
statusToStatusHeader 503 = HTTPTypes.status503
statusToStatusHeader 504 = HTTPTypes.status504
statusToStatusHeader 505 = HTTPTypes.status505
statusToStatusHeader _   = HTTPTypes.status505

hackAppToWaiApp :: Application -> Wai.Application
hackAppToWaiApp app request = do
   response <- io - app - requestToEnv request
   
   let wai_response = hackResponseToWaiResponse response 
   
   return - wai_response
   
  
  

hackResponseToWaiResponse :: Response -> Wai.Response
hackResponseToWaiResponse response = 
  let s = response.status.statusToStatusHeader
      h = response.headers.map headerToCaseInsensitiveHeader
  
      b = Lazy.fromChunks [response.body]
      
  in
  
  Wai.responseLBS s h b