module OfficialServer.DBInteraction

(

	startDBConnection

) where

import Prelude hiding (catch);

import Database.HDBC

import Database.HDBC.MySQL

import System.IO

import Control.Concurrent

import Control.Exception

import Monad

import Maybe

import System.Log.Logger

------------------------

import CoreTypes

fakeDbConnection serverInfo = do

	q <- readChan $ dbQueries serverInfo

	case q of

		CheckAccount clID name -> do

			writeChan (coreChan serverInfo) $ ClientAccountInfo clID Guest

	fakeDbConnection serverInfo

-------------------------------------------------------------------

-- borrowed from base 4.0.0 ---------------------------------------

onException :: IO a -> IO b -> IO a                              --

onException io what = io `catch` \e -> do what                   --

                                          throw (e :: Exception) --

-- to be deleted --------------------------------------------------

-------------------------------------------------------------------

dbQueryString =

	"SELECT users.pass, users_roles.rid FROM `users`, users_roles "

	++ "WHERE users.name = ? AND users_roles.uid = users.uid"

dbInteractionLoop queries coreChan dbConn = do

	q <- readChan queries

	case q of

		CheckAccount clID name -> do

				statement <- prepare dbConn dbQueryString

				execute statement [SqlString name]

				passAndRole <- fetchRow statement

				finish statement

				if isJust passAndRole then

					writeChan coreChan $

							ClientAccountInfo clID $

								HasAccount

									(fromSql $ head $ fromJust $ passAndRole)

									((fromSql $ last $ fromJust $ passAndRole) == (3 :: Int))

					else

					writeChan coreChan $ ClientAccountInfo clID Guest

			`onException`

				(unGetChan queries $ CheckAccount clID name)

	dbInteractionLoop queries coreChan dbConn

dbConnectionLoop serverInfo = do

	Control.Exception.handle (\e -> infoM "Database" $ show e) $ handleSqlError $

		bracket

			(connectMySQL defaultMySQLConnectInfo {mysqlHost = dbHost serverInfo, mysqlDatabase = "hedge_main", mysqlUser = dbLogin serverInfo, mysqlPassword = dbPassword serverInfo })

			(disconnect)

			(dbInteractionLoop (dbQueries serverInfo) (coreChan serverInfo))

	threadDelay (5 * 10^6)

	dbConnectionLoop serverInfo

startDBConnection serverInfo =

	if (not . null $ dbHost serverInfo) then

		forkIO $ dbConnectionLoop serverInfo

		else

		forkIO $ fakeDbConnection serverInfo