gameServer/Votes.hs
author sheepluva
Wed, 03 Dec 2014 18:22:57 +0100
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{-
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2014 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 \-}
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{-# LANGUAGE OverloadedStrings #-}
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module Votes where
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import Control.Monad.Reader
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import Control.Monad.State.Strict
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import ServerState
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import qualified Data.ByteString.Char8 as B
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import qualified Data.List as L
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import qualified Data.Map as Map
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import Data.Maybe
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-------------------
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import Utils
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import CoreTypes
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import HandlerUtils
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import EngineInteraction
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voted :: Bool -> Reader (ClientIndex, IRnC) [Action]
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voted vote = do
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    cl <- thisClient
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    rm <- thisRoom
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    uid <- liftM clUID thisClient
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    case voting rm of
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        Nothing -> 
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            return [AnswerClients [sendChan cl] ["CHAT", "[server]", loc "There's no voting going on"]]
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        Just voting ->
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            if uid `L.notElem` entitledToVote voting then
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                return []
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            else if uid `L.elem` map fst (votes voting) then
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                return [AnswerClients [sendChan cl] ["CHAT", "[server]", loc "You already have voted"]]
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            else
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                actOnVoting $ voting{votes = (uid, vote):votes voting}
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    where
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    actOnVoting :: Voting -> Reader (ClientIndex, IRnC) [Action]
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    actOnVoting vt = do
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        let (pro, contra) = L.partition snd $ votes vt
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        let totalV = length $ entitledToVote vt 
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        let successV = totalV `div` 2 + 1
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        if length contra > totalV - successV then
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            closeVoting
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        else if length pro >= successV then do
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            a <- act $ voteType vt
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            c <- closeVoting
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            return $ c ++ a
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        else
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            return [ModifyRoom $ \r -> r{voting = Just vt}]
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    closeVoting = do
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        chans <- roomClientsChans
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        return [
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            AnswerClients chans ["CHAT", "[server]", loc "Voting closed"]
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            , ModifyRoom (\r -> r{voting = Nothing})
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            ]
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    act (VoteKick nickname) = do
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        (thisClientId, rnc) <- ask
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        maybeClientId <- clientByNick nickname
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        rm <- thisRoom
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        let kickId = fromJust maybeClientId
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        let kickCl = rnc `client` kickId
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        let sameRoom = clientRoom rnc thisClientId == clientRoom rnc kickId
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        return
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            [KickRoomClient kickId |
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                isJust maybeClientId
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                && sameRoom
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                && ((isNothing $ gameInfo rm) || teamsInGame kickCl == 0)
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            ]
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    act (VoteMap roomSave) = do
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        rm <- thisRoom
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        let rs = Map.lookup roomSave (roomSaves rm)
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        case rs of
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             Nothing -> return []
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             Just (mp, p) -> do
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                 cl <- thisClient
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                 chans <- roomClientsChans
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                 let a = map (replaceChans chans) $ answerFullConfigParams cl mp p
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                 return $ 
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                    (ModifyRoom $ \r -> r{params = p, mapParams = mp})
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                    : SendUpdateOnThisRoom
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                    : a
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        where
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            replaceChans chans (AnswerClients _ msg) = AnswerClients chans msg
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            replaceChans _ a = a
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    act (VotePause) = do
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        rm <- thisRoom
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        chans <- roomClientsChans
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        let modifyGameInfo f room  = room{gameInfo = fmap f $ gameInfo room}
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        return [ModifyRoom (modifyGameInfo $ \g -> g{isPaused = not $ isPaused g}),
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                AnswerClients chans ["CHAT", "[server]", "Pause toggled"],
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                AnswerClients chans ["EM", toEngineMsg "I"]]
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startVote :: VoteType -> Reader (ClientIndex, IRnC) [Action]
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startVote vt = do
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    (ci, rnc) <- ask
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    --cl <- thisClient
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    rm <- thisRoom
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    chans <- roomClientsChans
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    let uids = map (clUID . client rnc) . roomClients rnc $ clientRoom rnc ci
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    if isJust $ voting rm then
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        return []
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    else
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        return [
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            ModifyRoom (\r -> r{voting = Just (newVoting vt){entitledToVote = uids}})
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            , AnswerClients chans ["CHAT", "[server]", B.concat [loc "New voting started", ": ", voteInfo vt]]
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            , ReactCmd ["VOTE", "YES"]
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        ]
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checkVotes :: StateT ServerState IO [Action]
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checkVotes = do
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    rnc <- gets roomsClients
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    liftM concat $ io $ do
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        ris <- allRoomsM rnc
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        mapM (check rnc) ris
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    where
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        check rnc ri = do
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            e <- room'sM rnc voting ri
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            case e of
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                 Just rv -> do
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                     modifyRoom rnc (\r -> r{voting = if voteTTL rv == 0 then Nothing else Just rv{voteTTL = voteTTL rv - 1}}) ri
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                     if voteTTL rv == 0 then do
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                        chans <- liftM (map sendChan) $ roomClientsM rnc ri
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                        return [AnswerClients chans ["CHAT", "[server]", loc "Voting expired"]]
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                        else
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                        return []
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                 Nothing -> return []
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voteInfo :: VoteType -> B.ByteString
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voteInfo (VoteKick n) = B.concat [loc "kick", " ", n]
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voteInfo (VoteMap n) = B.concat [loc "map", " ", n]
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voteInfo (VotePause) = B.concat [loc "pause"]