{-

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 \-}

{-# LANGUAGE OverloadedStrings #-}

module Utils where

import Data.Char

import Data.Word

import qualified Data.Map as Map

import qualified Data.Char as Char

import Numeric

import Network.Socket

import System.IO

import qualified Data.List as List

import Control.Monad

import qualified Data.ByteString.Lazy as BL

import qualified Data.ByteString.Char8 as B

import qualified Data.ByteString.UTF8 as UTF8

import Data.Maybe

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

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]) []

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

        : (showB . 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 = B.null b || length s > 40 || all isSpace s || isSpace (head s) || isSpace (last s) || any isIllegalChar s

    where

        s = UTF8.toString b

        isIllegalChar c = c `List.elem` ("$()*+?[]^{|}\x7F" ++ ['\x00'..'\x1F'])

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")

            , (39, "0.9.16")

            , (40, "0.9.17-dev")

            , (41, "0.9.17")

            , (42, "0.9.18-dev")

            , (43, "0.9.18")

            , (44, "0.9.19-dev")

            , (45, "0.9.19")

            , (46, "0.9.20-dev")

            , (47, "0.9.20")

            , (48, "0.9.21-dev")

            , (49, "0.9.21")

            , (50, "0.9.22-dev")

            , (51, "0.9.22")

            , (52, "0.9.23-dev")

            , (53, "0.9.23")

            , (54, "0.9.24-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

readInt_ :: (Num a) => B.ByteString -> a

readInt_ str =

  case B.readInt str of

       Just (i, t) | B.null t -> fromIntegral i

       _                      -> 0

cutHost :: B.ByteString -> B.ByteString

cutHost = B.intercalate "." .  flip (++) ["*","*"] . List.take 2 . B.split '.'

caseInsensitiveCompare :: B.ByteString -> B.ByteString -> Bool

caseInsensitiveCompare a b = upperCase a == upperCase b

upperCase :: B.ByteString -> B.ByteString

upperCase = UTF8.fromString . map Char.toUpper . UTF8.toString

roomInfo :: Word16 -> B.ByteString -> RoomInfo -> [B.ByteString]

roomInfo p n r

    | p < 46 = [

        showB $ isJust $ gameInfo r,

        name r,

        showB $ playersIn r,

        showB $ length $ teams r,

        n,

        Map.findWithDefault "+rnd+" "MAP" (mapParams r),

        head (Map.findWithDefault ["Default"] "SCHEME" (params r)),

        head (Map.findWithDefault ["Default"] "AMMO" (params r))

        ]

    | p < 48 = [

        showB $ isJust $ gameInfo r,

        name r,

        showB $ playersIn r,

        showB $ length $ teams r,

        n,

        Map.findWithDefault "+rnd+" "MAP" (mapParams r),

        head (Map.findWithDefault ["Normal"] "SCRIPT" (params r)),

        head (Map.findWithDefault ["Default"] "SCHEME" (params r)),

        head (Map.findWithDefault ["Default"] "AMMO" (params r))

        ]

    | otherwise = [

        B.pack roomFlags,

        name r,

        showB $ playersIn r,

        showB $ length $ teams r,

        n,

        Map.findWithDefault "+rnd+" "MAP" (mapParams r),

        head (Map.findWithDefault ["Normal"] "SCRIPT" (params r)),

        head (Map.findWithDefault ["Default"] "SCHEME" (params r)),

        head (Map.findWithDefault ["Default"] "AMMO" (params r))

        ]

    where

        roomFlags = concat [

            "-"

            , ['g' | isJust $ gameInfo r]

            , ['p' | not . B.null $ password r]

            , ['j' | isRestrictedJoins  r]

            , ['r' | isRegisteredOnly  r]

            ]

answerFullConfigParams ::

            ClientInfo

            -> Map.Map B.ByteString B.ByteString

            -> Map.Map B.ByteString [B.ByteString]

            -> [Action]

answerFullConfigParams cl mpr pr

        | clientProto cl < 38 = map (toAnswer cl) $

                (reverse . map (\(a, b) -> (a, [b])) $ Map.toList mpr)

                ++ (("SCHEME", pr Map.! "SCHEME")

                : (filter (\(p, _) -> p /= "SCHEME") $ Map.toList pr))

        | clientProto cl < 48 = map (toAnswer cl) $

                ("FULLMAPCONFIG", let l = Map.elems mpr in if length l > 5 then tail l else l)

                : ("SCHEME", pr Map.! "SCHEME")

                : (filter (\(p, _) -> p /= "SCHEME") $ Map.toList pr)

        | otherwise = map (toAnswer cl) $

                ("FULLMAPCONFIG", Map.elems mpr)

                : ("SCHEME", pr Map.! "SCHEME")

                : (filter (\(p, _) -> p /= "SCHEME") $ Map.toList pr)

    where

        toAnswer cl (paramName, paramStrs) = AnswerClients [sendChan cl] $ "CFG" : paramName : paramStrs

answerAllTeams :: ClientInfo -> [TeamInfo] -> [Action]

answerAllTeams cl = concatMap toAnswer

    where

        clChan = sendChan cl

        toAnswer team =

            [AnswerClients [clChan] $ teamToNet team,

            AnswerClients [clChan] ["TEAM_COLOR", teamname team, teamcolor team],

            AnswerClients [clChan] ["HH_NUM", teamname team, showB $ hhnum team]]

loc :: B.ByteString -> B.ByteString

loc = id

maybeNick :: Maybe ClientInfo -> B.ByteString

maybeNick = fromMaybe "[]" . liftM nick

-- borrowed from Data.List, just more general in types

deleteBy2                :: (a -> b -> Bool) -> a -> [b] -> [b]

deleteBy2 _  _ []        = []

deleteBy2 eq x (y:ys)    = if x `eq` y then ys else y : deleteBy2 eq x ys

deleteFirstsBy2          :: (a -> b -> Bool) -> [a] -> [b] -> [a]

deleteFirstsBy2 eq       =  foldl (flip (deleteBy2 (flip eq)))

sanitizeName :: B.ByteString -> B.ByteString

sanitizeName = B.map sc

    where

        sc c | isAlphaNum c = c

             | otherwise = '_'

isRegistered :: ClientInfo -> Bool

isRegistered = (<) 0 . B.length . webPassword