{-# 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