{-

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2014 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 Votes where

import Control.Monad.Reader

import Control.Monad.State.Strict

import ServerState

import qualified Data.ByteString.Char8 as B

import qualified Data.List as L

import qualified Data.Map as Map

import Data.Maybe

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

import Utils

import CoreTypes

import HandlerUtils

import EngineInteraction

voted :: Bool -> Reader (ClientIndex, IRnC) [Action]

voted vote = do

    cl <- thisClient

    rm <- thisRoom

    uid <- liftM clUID thisClient

    case voting rm of

        Nothing -> 

            return [AnswerClients [sendChan cl] ["CHAT", "[server]", loc "There's no voting going on"]]

        Just voting ->

            if uid `L.notElem` entitledToVote voting then

                return []

            else if uid `L.elem` map fst (votes voting) then

                return [AnswerClients [sendChan cl] ["CHAT", "[server]", loc "You already have voted"]]

            else

                actOnVoting $ voting{votes = (uid, vote):votes voting}

    where

    actOnVoting :: Voting -> Reader (ClientIndex, IRnC) [Action]

    actOnVoting vt = do

        let (pro, contra) = L.partition snd $ votes vt

        let totalV = length $ entitledToVote vt 

        let successV = totalV `div` 2 + 1

        if length contra > totalV - successV then

            closeVoting

        else if length pro >= successV then do

            a <- act $ voteType vt

            c <- closeVoting

            return $ c ++ a

        else

            return [ModifyRoom $ \r -> r{voting = Just vt}]

    closeVoting = do

        chans <- roomClientsChans

        return [

            AnswerClients chans ["CHAT", "[server]", loc "Voting closed"]

            , ModifyRoom (\r -> r{voting = Nothing})

            ]

    act (VoteKick nickname) = do

        (thisClientId, rnc) <- ask

        maybeClientId <- clientByNick nickname

        rm <- thisRoom

        let kickId = fromJust maybeClientId

        let kickCl = rnc `client` kickId

        let sameRoom = clientRoom rnc thisClientId == clientRoom rnc kickId

        return

            [KickRoomClient kickId |

                isJust maybeClientId

                && sameRoom

                && ((isNothing $ gameInfo rm) || teamsInGame kickCl == 0)

            ]

    act (VoteMap roomSave) = do

        rm <- thisRoom

        let rs = Map.lookup roomSave (roomSaves rm)

        case rs of

             Nothing -> return []

             Just (mp, p) -> do

                 cl <- thisClient

                 chans <- roomClientsChans

                 let a = map (replaceChans chans) $ answerFullConfigParams cl mp p

                 return $ 

                    (ModifyRoom $ \r -> r{params = p, mapParams = mp})

                    : SendUpdateOnThisRoom

                    : a

        where

            replaceChans chans (AnswerClients _ msg) = AnswerClients chans msg

            replaceChans _ a = a

    act (VotePause) = do

        rm <- thisRoom

        chans <- roomClientsChans

        let modifyGameInfo f room  = room{gameInfo = fmap f $ gameInfo room}

        return [ModifyRoom (modifyGameInfo $ \g -> g{isPaused = not $ isPaused g}),

                AnswerClients chans ["CHAT", "[server]", "Pause toggled"],

                AnswerClients chans ["EM", toEngineMsg "I"]]

startVote :: VoteType -> Reader (ClientIndex, IRnC) [Action]

startVote vt = do

    (ci, rnc) <- ask

    --cl <- thisClient

    rm <- thisRoom

    chans <- roomClientsChans

    let uids = map (clUID . client rnc) . roomClients rnc $ clientRoom rnc ci

    if isJust $ voting rm then

        return []

    else

        return [

            ModifyRoom (\r -> r{voting = Just (newVoting vt){entitledToVote = uids}})

            , AnswerClients chans ["CHAT", "[server]", B.concat [loc "New voting started", ": ", voteInfo vt]]

            , ReactCmd ["VOTE", "YES"]

        ]

checkVotes :: StateT ServerState IO [Action]

checkVotes = do

    rnc <- gets roomsClients

    liftM concat $ io $ do

        ris <- allRoomsM rnc

        mapM (check rnc) ris

    where

        check rnc ri = do

            e <- room'sM rnc voting ri

            case e of

                 Just rv -> do

                     modifyRoom rnc (\r -> r{voting = if voteTTL rv == 0 then Nothing else Just rv{voteTTL = voteTTL rv - 1}}) ri

                     if voteTTL rv == 0 then do

                        chans <- liftM (map sendChan) $ roomClientsM rnc ri

                        return [AnswerClients chans ["CHAT", "[server]", loc "Voting expired"]]

                        else

                        return []

                 Nothing -> return []

voteInfo :: VoteType -> B.ByteString

voteInfo (VoteKick n) = B.concat [loc "kick", " ", n]

voteInfo (VoteMap n) = B.concat [loc "map", " ", n]

voteInfo (VotePause) = B.concat [loc "pause"]