{-# LANGUAGE OverloadedStrings #-}

module Utils where

import Data.Char

import Data.Word

import qualified Data.Map as Map

import qualified Data.Set as Set

import Numeric

import Network.Socket

import System.IO

import qualified Data.List as List

import Control.Monad

import qualified Codec.Binary.Base64 as Base64

import qualified Data.ByteString.Char8 as B

import qualified Data.ByteString as BW

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

import CoreTypes

sockAddr2String :: SockAddr -> IO B.ByteString

sockAddr2String (SockAddrInet _ hostAddr) = liftM B.pack $ inet_ntoa hostAddr

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

    return $ B.pack $ (foldr1 (.)

        $ List.intersperse (':':)

        $ concatMap (\n -> (\(a0, a1) -> [showHex a0, showHex a1]) $ divMod n 65536) [a, b, c, d]) []

toEngineMsg :: B.ByteString -> B.ByteString

toEngineMsg msg = B.pack $ Base64.encode (fromIntegral (BW.length msg) : BW.unpack msg)

fromEngineMsg :: B.ByteString -> Maybe B.ByteString

fromEngineMsg msg = liftM BW.pack (Base64.decode (B.unpack msg) >>= removeLength)

    where

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

        removeLength _ = Nothing

checkNetCmd :: B.ByteString -> (Bool, Bool)

checkNetCmd = check . liftM B.unpack . fromEngineMsg

    where

        check Nothing = (False, False)

        check (Just (m:_)) = (m `Set.member` legalMessages, m == '+')

        check _ = (False, False)

        legalMessages = Set.fromList $ "M#+LlRrUuDdZzAaSjJ,sFNpPwtghbc12345" ++ 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 :: TeamInfo -> [B.ByteString]

teamToNet team =

        "ADD_TEAM"

        : teamname team

        : teamgrave team

        : teamfort team

        : teamvoicepack team

        : teamflag team

        : teamowner team

        : (B.pack . show $ difficulty team)

        : hhsInfo

    where

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

modifyTeam :: TeamInfo -> RoomInfo -> RoomInfo

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

    where

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

    replaceTeam tm (t:ts) =

        if teamname tm == teamname t then

            tm : ts

        else

            t : replaceTeam tm ts

illegalName :: B.ByteString -> Bool

illegalName b = null s || all isSpace s || isSpace (head s) || isSpace (last s)

    where

        s = B.unpack b

protoNumber2ver :: Word16 -> B.ByteString

protoNumber2ver v = Map.findWithDefault "Unknown" v vermap

    where

        vermap = Map.fromList [

            (17, "0.9.7-dev")

            , (19, "0.9.7")

            , (20, "0.9.8-dev")

            , (21, "0.9.8")

            , (22, "0.9.9-dev")

            , (23, "0.9.9")

            , (24, "0.9.10-dev")

            , (25, "0.9.10")

            , (26, "0.9.11-dev")

            , (27, "0.9.11")

            , (28, "0.9.12-dev")

            , (29, "0.9.12")

            , (30, "0.9.13-dev")

            , (31, "0.9.13")

            , (32, "0.9.14-dev")

            , (33, "0.9.14")

            , (34, "0.9.15-dev")

            , (35, "0.9.14.1")

            , (37, "0.9.15")

            , (38, "0.9.16-dev")

            ]

askFromConsole :: B.ByteString -> IO B.ByteString

askFromConsole msg = do

    B.putStr msg

    hFlush stdout

    B.getLine

unfoldrE :: (b -> Either b (a, b)) -> b -> ([a], b)

unfoldrE f b  =

    case f b of

        Right (a, new_b) -> let (a', b') = unfoldrE f new_b in (a : a', b')

        Left new_b       -> ([], new_b)

showB :: Show a => a -> B.ByteString

showB = B.pack .show