{-# LANGUAGE OverloadedStrings #-}

module Actions where

import Control.Concurrent

import Control.Concurrent.Chan

import qualified Data.IntSet as IntSet

import qualified Data.Set as Set

import qualified Data.Sequence as Seq

import System.Log.Logger

import Monad

import Data.Time

import Maybe

import Control.Monad.Reader

import Control.Monad.State

import qualified Data.ByteString.Char8 as B

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

import CoreTypes

import Utils

import ClientIO

import ServerState

data Action =

    AnswerClients ![ClientChan] ![B.ByteString]

    | SendServerMessage

    | SendServerVars

    | MoveToRoom RoomIndex

    | MoveToLobby B.ByteString

    | RemoveTeam B.ByteString

    | RemoveRoom

    | UnreadyRoomClients

    | JoinLobby

    | ProtocolError B.ByteString

    | Warning B.ByteString

    | ByeClient B.ByteString

    | KickClient ClientIndex

    | KickRoomClient ClientIndex

    | BanClient B.ByteString -- nick

    | RemoveClientTeams ClientIndex

    | ModifyClient (ClientInfo -> ClientInfo)

    | ModifyClient2 ClientIndex (ClientInfo -> ClientInfo)

    | ModifyRoom (RoomInfo -> RoomInfo)

    | ModifyServerInfo (ServerInfo -> ServerInfo)

    | AddRoom B.ByteString B.ByteString

    | CheckRegistered

    | ClearAccountsCache

    | ProcessAccountInfo AccountInfo

    | Dump

    | AddClient ClientInfo

    | DeleteClient ClientIndex

    | PingAll

    | StatsAction

type CmdHandler = [B.ByteString] -> Reader (ClientIndex, IRnC) [Action]

processAction :: Action -> StateT ServerState IO ()

processAction (AnswerClients chans msg) = 

    liftIO $ mapM_ (flip writeChan msg) chans

processAction SendServerMessage = do

    chan <- client's sendChan

    protonum <- client's clientProto

    si <- liftM serverInfo get

    let message = if protonum < latestReleaseVersion si then

            serverMessageForOldVersions si

            else

            serverMessage si

    liftIO $ writeChan chan ["SERVER_MESSAGE", message]

{-

processAction (clID, serverInfo, rnc) SendServerVars = do

    writeChan (sendChan $ clients ! clID) ("SERVER_VARS" : vars)

    return (clID, serverInfo, rnc)

    where

        client = clients ! clID

        vars = [

            "MOTD_NEW", serverMessage serverInfo,

            "MOTD_OLD", serverMessageForOldVersions serverInfo,

            "LATEST_PROTO", show $ latestReleaseVersion serverInfo

            ]

-}

processAction (ProtocolError msg) = do

    chan <- client's sendChan

    liftIO $ writeChan chan ["ERROR", msg]

processAction (Warning msg) = do

    chan <- client's sendChan

    liftIO $ writeChan chan ["WARNING", msg]

processAction (ByeClient msg) = do

    (Just ci) <- gets clientIndex

    rnc <- gets roomsClients

    ri <- clientRoomA

    when (ri /= lobbyId) $ do

        processAction $ MoveToLobby ("quit: " `B.append` msg)

        return ()

    chan <- client's sendChan

    ready <- client's isReady

    liftIO $ do

        infoM "Clients" (show ci ++ " quits: " ++ (B.unpack msg))

        --mapM_ (processAction (ci, serverInfo, rnc)) $ answerOthersQuit ++ answerInformRoom

        writeChan chan ["BYE", msg]

        modifyRoom rnc (\r -> r{

                        --playersIDs = IntSet.delete ci (playersIDs r)

                        playersIn = (playersIn r) - 1,

                        readyPlayers = if ready then readyPlayers r - 1 else readyPlayers r

                        }) ri

        removeClient rnc ci

    modify (\s -> s{removedClients = ci `Set.insert` removedClients s})

processAction (DeleteClient ci) = do

    modify (\s -> s{removedClients = ci `Set.delete` removedClients s})

{-

    where

        client = clients ! clID

        clientNick = nick client

        answerInformRoom =

            if roomID client /= 0 then

                if not $ Prelude.null msg then

                    [AnswerThisRoom ["LEFT", clientNick, msg]]

                else

                    [AnswerThisRoom ["LEFT", clientNick]]

            else

                []

        answerOthersQuit =

            if logonPassed client then

                if not $ Prelude.null msg then

                    [AnswerAll ["LOBBY:LEFT", clientNick, msg]]

                else

                    [AnswerAll ["LOBBY:LEFT", clientNick]]

            else

            [] 

-}

processAction (ModifyClient f) = do

    (Just ci) <- gets clientIndex

    rnc <- gets roomsClients

    liftIO $ modifyClient rnc f ci

    return ()

processAction (ModifyClient2 ci f) = do

    rnc <- gets roomsClients

    liftIO $ modifyClient rnc f ci

    return ()

processAction (ModifyRoom f) = do

    rnc <- gets roomsClients

    ri <- clientRoomA

    liftIO $ modifyRoom rnc f ri

    return ()

{-

processAction (clID, serverInfo, rnc) (ModifyServerInfo func) =

    return (clID, func serverInfo, rnc)

-}

processAction (MoveToRoom ri) = do

    (Just ci) <- gets clientIndex

    rnc <- gets roomsClients

    liftIO $ do

        modifyClient rnc (\cl -> cl{teamsInGame = 0}) ci

        modifyRoom rnc (\r -> r{playersIn = (playersIn r) + 1}) ri

    liftIO $ moveClientToRoom rnc ri ci

    chans <- liftM (map sendChan) $ roomClientsS ri

    clNick <- client's nick

    processAction $ AnswerClients chans ["JOINED", clNick]

processAction (MoveToLobby msg) = do

    (Just ci) <- gets clientIndex

    --ri <- clientRoomA

    rnc <- gets roomsClients

    liftIO $ moveClientToLobby rnc ci

{-

    (_, _, newClients, newRooms) <-

            if isMaster client then

                if (gameinprogress room) && (playersIn room > 1) then

                    (changeMaster >>= (\state -> foldM processAction state

                        [AnswerOthersInRoom ["LEFT", nick client, msg],

                        AnswerOthersInRoom ["WARNING", "Admin left the room"],

                        RemoveClientTeams clID]))

                else -- not in game

                    processAction (clID, serverInfo, rnc) RemoveRoom

            else -- not master

                foldM

                    processAction

                        (clID, serverInfo, rnc)

                        [AnswerOthersInRoom ["LEFT", nick client, msg],

                        RemoveClientTeams clID]

    return (

        clID,

        serverInfo,

        adjust resetClientFlags clID newClients,

        adjust removeClientFromRoom rID $ adjust insertClientToRoom 0 newRooms

        )

    where

        rID = roomID client

        client = clients ! clID

        room = rooms ! rID

        resetClientFlags cl = cl{roomID = 0, isMaster = False, isReady = False, teamsInGame = undefined}

        removeClientFromRoom r = r{

                playersIDs = otherPlayersSet,

                playersIn = (playersIn r) - 1,

                readyPlayers = if isReady client then (readyPlayers r) - 1 else readyPlayers r

                }

        insertClientToRoom r = r{playersIDs = IntSet.insert clID (playersIDs r)}

        changeMaster = do

            processAction (newMasterId, serverInfo, rnc) $ AnswerThisClient ["ROOM_CONTROL_ACCESS", "1"]

            return (

                clID,

                serverInfo,

                adjust (\cl -> cl{isMaster = True}) newMasterId clients,

                adjust (\r -> r{masterID = newMasterId, name = newRoomName}) rID rooms

                )

        newRoomName = nick newMasterClient

        otherPlayersSet = IntSet.delete clID (playersIDs room)

        newMasterId = IntSet.findMin otherPlayersSet

        newMasterClient = clients ! newMasterId

-}

processAction (AddRoom roomName roomPassword) = do

    Just clId <- gets clientIndex

    rnc <- gets roomsClients

    proto <- liftIO $ client'sM rnc clientProto clId

    let room = newRoom{

            masterID = clId,

            name = roomName,

            password = roomPassword,

            roomProto = proto

            }

    rId <- liftIO $ addRoom rnc room

    processAction $ MoveToRoom rId

    chans <- liftM (map sendChan) $ roomClientsS lobbyId

    mapM_ processAction [

        AnswerClients chans ["ROOM", "ADD", roomName]

        , ModifyClient (\cl -> cl{isMaster = True})

        ]

{-

processAction (clID, serverInfo, rnc) (RemoveRoom) = do

    processAction (clID, serverInfo, rnc) $ AnswerLobby ["ROOM", "DEL", name room]

    processAction (clID, serverInfo, rnc) $ AnswerOthersInRoom ["ROOMABANDONED", name room]

    return (clID,

        serverInfo,

        Data.IntMap.map (\cl -> if roomID cl == rID then cl{roomID = 0, isMaster = False, isReady = False, teamsInGame = undefined} else cl) clients,

        delete rID $ adjust (\r -> r{playersIDs = IntSet.union (playersIDs room) (playersIDs r)}) 0 rooms

        )

    where

        room = rooms ! rID

        rID = roomID client

        client = clients ! clID

processAction (RemoveTeam teamName) = do

    rnc <- gets roomsClients

    cl <- client's id

    ri <- clientRoomA

    inGame <- liftIO $ room'sM rnc gameinprogress ri

    chans <- liftM (map sendChan . filter (/= cl)) $ roomClientsS ri

    if inGame then

            mapM_ processAction [

                AnswerClients chans ["REMOVE_TEAM", teamName],

                ModifyRoom (\r -> r{teams = Prelude.filter (\t -> teamName /= teamname t) $ teams r})

                ]

        else

            mapM_ processAction [

                AnswerClients chans ["EM", rmTeamMsg],

                ModifyRoom (\r -> r{

                    teams = Prelude.filter (\t -> teamName /= teamname t) $ teams r,

                    leftTeams = teamName : leftTeams r,

                    roundMsgs = roundMsgs r Seq.|> rmTeamMsg

                    })

                ]

    where

        rmTeamMsg = toEngineMsg $ (B.singleton 'F') `B.append` teamName

processAction CheckRegistered = do

    (Just ci) <- gets clientIndex

    n <- client's nick

    h <- client's host

    db <- gets (dbQueries . serverInfo)

    liftIO $ writeChan db $ CheckAccount ci n h

    return ()

{-

processAction (clID, serverInfo, rnc) (ClearAccountsCache) = do

    writeChan (dbQueries serverInfo) ClearCache

    return (clID, serverInfo, rnc)

    where

        client = clients ! clID

processAction (clID, serverInfo, rnc) (Dump) = do

    writeChan (sendChan $ clients ! clID) ["DUMP", show serverInfo, showTree clients, showTree rooms]

    return (clID, serverInfo, rnc)

-}

processAction (ProcessAccountInfo info) =

    case info of

        HasAccount passwd isAdmin -> do

            chan <- client's sendChan

            liftIO $ writeChan chan ["ASKPASSWORD"]

        Guest -> do

            processAction JoinLobby

        Admin -> do

            mapM processAction [ModifyClient (\cl -> cl{isAdministrator = True}), JoinLobby]

            chan <- client's sendChan

            liftIO $ writeChan chan ["ADMIN_ACCESS"]

processAction JoinLobby = do

    chan <- client's sendChan

    clientNick <- client's nick

    (lobbyNicks, clientsChans) <- liftM (unzip . Prelude.map (\c -> (nick c, sendChan c)) . Prelude.filter logonPassed) $! allClientsS

    mapM_ processAction $

        (AnswerClients clientsChans ["LOBBY:JOINED", clientNick])

        : [AnswerClients [chan] ("LOBBY:JOINED" : clientNick : lobbyNicks)]

        ++ [ModifyClient (\cl -> cl{logonPassed = True}), SendServerMessage]

{-

processAction (clID, serverInfo, rnc) (RoomAddThisClient rID) =

    processAction (

        clID,

        serverInfo,

        adjust (\cl -> cl{roomID = rID, teamsInGame = if rID == 0 then teamsInGame cl else 0}) clID clients,

        adjust (\r -> r{playersIDs = IntSet.insert clID (playersIDs r), playersIn = (playersIn r) + 1}) rID $

            adjust (\r -> r{playersIDs = IntSet.delete clID (playersIDs r)}) 0 rooms

        ) joinMsg

    where

        client = clients ! clID

        joinMsg = if rID == 0 then

                AnswerAllOthers ["LOBBY:JOINED", nick client]

            else

                AnswerThisRoom ["JOINED", nick client]

processAction (clID, serverInfo, rnc) (KickClient kickID) =

    liftM2 replaceID (return clID) (processAction (kickID, serverInfo, rnc) $ ByeClient "Kicked")

processAction (clID, serverInfo, rnc) (BanClient banNick) =

    return (clID, serverInfo, rnc)

processAction (clID, serverInfo, rnc) (KickRoomClient kickID) = do

    writeChan (sendChan $ clients ! kickID) ["KICKED"]

    liftM2 replaceID (return clID) (processAction (kickID, serverInfo, rnc) $ RoomRemoveThisClient "kicked")

processAction (clID, serverInfo, rnc) (RemoveClientTeams teamsClID) =

    liftM2 replaceID (return clID) $

        foldM processAction (teamsClID, serverInfo, rnc) removeTeamsActions

    where

        client = clients ! teamsClID

        room = rooms ! (roomID client)

        teamsToRemove = Prelude.filter (\t -> teamowner t == nick client) $ teams room

        removeTeamsActions = Prelude.map (RemoveTeam . teamname) teamsToRemove

-}

processAction (AddClient client) = do

    rnc <- gets roomsClients

    si <- gets serverInfo

    liftIO $ do

        ci <- addClient rnc client

        forkIO $ clientRecvLoop (clientSocket client) (coreChan si) ci

        forkIO $ clientSendLoop (clientSocket client) (coreChan si) (sendChan client) ci

        infoM "Clients" (show ci ++ ": New client. Time: " ++ show (connectTime client))

        writeChan (sendChan client) ["CONNECTED", "Hedgewars server http://www.hedgewars.org/"]

{-        let newLogins = takeWhile (\(_ , time) -> (connectTime client) `diffUTCTime` time <= 11) $ lastLogins serverInfo

        if False && (isJust $ host client `Prelude.lookup` newLogins) then

            processAction (ci, serverInfo{lastLogins = newLogins}, rnc) $ ByeClient "Reconnected too fast"

            else

            return (ci, serverInfo)

-}

processAction PingAll = do

    rnc <- gets roomsClients

    cis <- liftIO $ allClientsM rnc

    mapM_ (kickTimeouted rnc) $ cis

    chans <- liftIO $ mapM (client'sM rnc sendChan) cis

    liftIO $ mapM_ (modifyClient rnc (\cl -> cl{pingsQueue = pingsQueue cl + 1})) cis

    processAction $ AnswerClients chans ["PING"]

    where

        kickTimeouted rnc ci = do

            pq <- liftIO $ client'sM rnc pingsQueue ci

            when (pq > 0) $

                withStateT (\as -> as{clientIndex = Just ci}) $

                    processAction (ByeClient "Ping timeout")

processAction (StatsAction) = do

    rnc <- gets roomsClients

    si <- gets serverInfo

    (roomsNum, clientsNum) <- liftIO $ withRoomsAndClients rnc stats

    liftIO $ writeChan (dbQueries si) $ SendStats clientsNum (roomsNum - 1)

    where

          stats irnc = (length $ allRooms irnc, length $ allClients irnc)