module Utils where

import Control.Concurrent

import Control.Concurrent.STM

import Data.Char

import Data.Word

import qualified Data.Map as Map

import qualified Data.IntMap as IntMap

import qualified Data.Set as Set

import Data.ByteString.Internal (w2c)

import Numeric

import Network.Socket

import System.IO

import qualified Data.List as List

import Control.Monad

import Maybe

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

import qualified Codec.Binary.Base64 as Base64

import qualified Codec.Binary.UTF8.String as UTF8

import CoreTypes

sockAddr2String :: SockAddr -> IO String

sockAddr2String (SockAddrInet _ hostAddr) = inet_ntoa hostAddr

sockAddr2String (SockAddrInet6 _ _ (a, b, c, d) _) =

	return $ (foldr1 (.)

		$ List.intersperse (\a -> ':':a)

		$ concatMap (\n -> (\(a, b) -> [showHex a, showHex b]) $ divMod n 65536) [a, b, c, d]) []

toEngineMsg :: String -> String

toEngineMsg msg = Base64.encode (fromIntegral (length msg) : (UTF8.encode msg))

fromEngineMsg :: String -> Maybe String

fromEngineMsg msg = liftM (map w2c) (Base64.decode msg >>= removeLength)

	where

		removeLength (x:xs) = if length xs == fromIntegral x then Just xs else Nothing

		removeLength _ = Nothing

isLegalNetCommand :: String -> Bool

isLegalNetCommand msg = test decoded

	where

		decoded = fromEngineMsg msg

		test Nothing = False

		test (Just (m:ms)) = m `Set.member` legalMessages

		test _ = False

		legalMessages = Set.fromList $ "M#+LlRrUuDdZzAaSjJ,sFNpPwtghb12345" ++ slotMessages

		slotMessages = "\128\129\130\131\132\133\134\135\136\137\138"

maybeRead :: Read a => String -> Maybe a

maybeRead s = case reads s of

	[(x, rest)] | all isSpace rest -> Just x

	_         -> Nothing

teamToNet team = [

		"ADD_TEAM",

		teamname team,

		teamgrave team,

		teamfort team,

		teamvoicepack team,

		teamowner team,

		show $ difficulty team

		]

		++ hhsInfo

	where

		hhsInfo = concatMap (\(HedgehogInfo name hat) -> [name, hat]) $ hedgehogs team

modifyTeam :: TeamInfo -> RoomInfo -> RoomInfo

modifyTeam team room = room{teams = replaceTeam team $ teams room}

	where

	replaceTeam _ [] = error "modifyTeam: no such team"

	replaceTeam team (t:teams) =

		if teamname team == teamname t then

			team : teams

		else

			t : replaceTeam team teams

illegalName :: String -> Bool

illegalName = all isSpace

protoNumber2ver :: Word16 -> String

protoNumber2ver 17 = "0.9.7-dev"

protoNumber2ver 19 = "0.9.7"

protoNumber2ver 20 = "0.9.8-dev"

protoNumber2ver 21 = "0.9.8"

protoNumber2ver 22 = "0.9.9-dev"

protoNumber2ver 23 = "0.9.9"

protoNumber2ver 24 = "0.9.10-dev"

protoNumber2ver 25 = "0.9.10"

protoNumber2ver 26 = "0.9.11-dev"

protoNumber2ver 27 = "0.9.11"

protoNumber2ver 28 = "0.9.12-dev"

protoNumber2ver _ = "Unknown"

askFromConsole :: String -> IO String

askFromConsole msg = do

	putStr msg

	hFlush stdout

	getLine