{-# LANGUAGE ScopedTypeVariables, OverloadedStrings #-}

module Main where

import Prelude hiding (catch)

import Control.Monad

import Control.Exception

import System.IO

import Data.Maybe

import Database.HDBC

import Database.HDBC.MySQL

import Data.List (lookup)

import qualified Data.ByteString.Char8 as B

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

import CoreTypes

import Utils

dbQueryAccount =

    "SELECT users.pass, users_roles.rid FROM users LEFT JOIN users_roles ON (users.uid = users_roles.uid AND users_roles.rid = 3) WHERE users.name = ?"

dbQueryStats =

    "INSERT INTO gameserver_stats (players, rooms, last_update) VALUES (?, ?, UNIX_TIMESTAMP())"

dbQueryAchievement =

    \ VALUES ((SELECT id FROM achievement_types WHERE name = ?), (SELECT uid FROM users WHERE name = ?), \

    \ ?, ?, ?)"

dbInteractionLoop dbConn = forever $ do

    q <- liftM read getLine

    hPutStrLn stderr $ show q

    case q of

        CheckAccount clId clUid clNick _ -> do

                statement <- prepare dbConn dbQueryAccount

                execute statement [SqlByteString clNick]

                passAndRole <- fetchRow statement

                finish statement

                let response =

                        if isJust passAndRole then

                        (

                            clId,

                            clUid,

                            HasAccount

                                (fromSql . head . fromJust $ passAndRole)

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

                        )

                        else

                        (clId, clUid, Guest)

                print response

                hFlush stdout

        SendStats clients rooms ->

                run dbConn dbQueryStats [SqlInt32 $ fromIntegral clients, SqlInt32 $ fromIntegral rooms] >> return ()

--StoreAchievements (B.pack fileName) (map toPair teams) info

        StoreAchievements fileName teams info -> 

            mapM_ (run dbConn dbQueryAchievement) $ (parseStats fileName teams) info

parseStats :: B.ByteString -> [(B.ByteString, B.ByteString)] -> [B.ByteString] -> [[SqlValue]]

parseStats fileName teams = ps

    where

    ps [] = []

    ps ("DRAW" : bs) = ps bs

    ps ("WINNERS" : n : bs) = ps $ drop (readInt_ n) bs

    ps ("ACHIEVEMENT" : typ : teamname : location : value : bs) =

        , SqlByteString $ fromMaybe "" (lookup teamname teams)

        , SqlInt32 (readInt_ value)

        , SqlByteString fileName

        , SqlByteString location

        ] : ps bs

    ps (b:bs) = ps bs

dbConnectionLoop mySQLConnectionInfo =

    Control.Exception.handle (\(e :: IOException) -> hPutStrLn stderr $ show e) $ handleSqlError $

        bracket

            (connectMySQL mySQLConnectionInfo)

            disconnect

            dbInteractionLoop

--processRequest :: DBQuery -> IO String

--processRequest (CheckAccount clId clUid clNick clHost) = return $ show (clclId, clUid, Guest)

main = do

        dbHost <- getLine

        dbName <- getLine

        dbLogin <- getLine

        dbPassword <- getLine

        let mySQLConnectInfo = defaultMySQLConnectInfo {mysqlHost = dbHost, mysqlDatabase = dbName, mysqlUser = dbLogin, mysqlPassword = dbPassword}

        dbConnectionLoop mySQLConnectInfo