module Actions where

import Control.Concurrent.STM

import Control.Concurrent.Chan

import Data.IntMap

import qualified Data.IntSet as IntSet

import qualified Data.Sequence as Seq

import System.Log.Logger

import Monad

import Data.Time

import Maybe

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

import CoreTypes

import Utils

data Action =

	AnswerThisClient [String]

	| AnswerAll [String]

	| AnswerAllOthers [String]

	| AnswerThisRoom [String]

	| AnswerOthersInRoom [String]

	| AnswerLobby [String]

	| SendServerMessage

	| RoomAddThisClient Int -- roomID

	| RoomRemoveThisClient String

	| RemoveTeam String

	| RemoveRoom

	| UnreadyRoomClients

	| MoveToLobby

	| ProtocolError String

	| Warning String

	| ByeClient String

	| KickClient Int -- clID

	| KickRoomClient Int -- clID

	| BanClient String -- nick

	| RemoveClientTeams Int -- clID

	| ModifyClient (ClientInfo -> ClientInfo)

	| ModifyRoom (RoomInfo -> RoomInfo)

	| ModifyServerInfo (ServerInfo -> ServerInfo)

	| AddRoom String String

	| CheckRegistered

	| ClearAccountsCache

	| ProcessAccountInfo AccountInfo

	| Dump

	| AddClient ClientInfo

	| PingAll

	| StatsAction

type CmdHandler = Int -> Clients -> Rooms -> [String] -> [Action]

replaceID a (b, c, d, e) = (a, c, d, e)

processAction :: (Int, ServerInfo, Clients, Rooms) -> Action -> IO (Int, ServerInfo, Clients, Rooms)

processAction (clID, serverInfo, clients, rooms) (AnswerThisClient msg) = do

	writeChan (sendChan $ clients ! clID) msg

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (AnswerAll msg) = do

	mapM_ (\cl -> writeChan (sendChan cl) msg) (elems clients)

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (AnswerAllOthers msg) = do

	mapM_ (\id -> writeChan (sendChan $ clients ! id) msg) $

		Prelude.filter (\id' -> (id' /= clID) && (logonPassed $ clients ! id')) (keys clients)

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (AnswerThisRoom msg) = do

	mapM_ (\id -> writeChan (sendChan $ clients ! id) msg) roomClients

	return (clID, serverInfo, clients, rooms)

	where

		roomClients = IntSet.elems $ playersIDs room

		room = rooms ! rID

		rID = roomID client

		client = clients ! clID

processAction (clID, serverInfo, clients, rooms) (AnswerOthersInRoom msg) = do

	mapM_ (\id -> writeChan (sendChan $ clients ! id) msg) $ Prelude.filter (/= clID) roomClients

	return (clID, serverInfo, clients, rooms)

	where

		roomClients = IntSet.elems $ playersIDs room

		room = rooms ! rID

		rID = roomID client

		client = clients ! clID

processAction (clID, serverInfo, clients, rooms) (AnswerLobby msg) = do

	mapM_ (\id -> writeChan (sendChan $ clients ! id) msg) roomClients

	return (clID, serverInfo, clients, rooms)

	where

		roomClients = IntSet.elems $ playersIDs room

		room = rooms ! 0

processAction (clID, serverInfo, clients, rooms) SendServerMessage = do

	writeChan (sendChan $ clients ! clID) $ ["SERVER_MESSAGE", message serverInfo]

	return (clID, serverInfo, clients, rooms)

	where

		client = clients ! clID

		message = if clientProto client < 27 then

			serverMessageForOldVersions

			else

			serverMessage

processAction (clID, serverInfo, clients, rooms) (ProtocolError msg) = do

	writeChan (sendChan $ clients ! clID) ["ERROR", msg]

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (Warning msg) = do

	writeChan (sendChan $ clients ! clID) ["WARNING", msg]

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (ByeClient msg) = do

	infoM "Clients" ((show $ clientUID client) ++ " quits: " ++ msg)

	(_, _, newClients, newRooms) <-

			if roomID client /= 0 then

				processAction  (clID, serverInfo, clients, rooms) $ RoomRemoveThisClient "quit"

				else

					return (clID, serverInfo, clients, rooms)

	mapM_ (processAction (clID, serverInfo, newClients, newRooms)) $ answerOthersQuit ++ answerInformRoom

	writeChan (sendChan $ clients ! clID) ["BYE", msg]

	return (

			0,

			serverInfo,

			delete clID newClients,

			adjust (\r -> r{

					playersIDs = IntSet.delete clID (playersIDs r),

					playersIn = (playersIn r) - 1,

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

					}) (roomID $ newClients ! clID) newRooms

			)

	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 (clID, serverInfo, clients, rooms) (ModifyClient func) = do

	return (clID, serverInfo, adjust func clID clients, rooms)

processAction (clID, serverInfo, clients, rooms) (ModifyRoom func) = do

	return (clID, serverInfo, clients, adjust func rID rooms)

	where

		rID = roomID $ clients ! clID

processAction (clID, serverInfo, clients, rooms) (ModifyServerInfo func) = do

	return (clID, func serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (RoomAddThisClient rID) = do

	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, clients, rooms) (RoomRemoveThisClient msg) = do

	(_, _, newClients, newRooms) <-

		if roomID client /= 0 then

			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, clients, rooms) RemoveRoom

			else -- not master

				foldM

					processAction

						(clID, serverInfo, clients, rooms)

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

						RemoveClientTeams clID]

		else -- in lobby

			return (clID, serverInfo, clients, rooms)

	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, clients, rooms) $ AnswerThisClient ["ROOM_CONTROL_ACCESS", "1"]

			return (

				clID,

				serverInfo,

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

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

				)

		newRoomName = nick newMasterClient

		otherPlayersSet = IntSet.delete clID (playersIDs room)

		newMasterId = IntSet.findMin otherPlayersSet

		newMasterClient = clients ! newMasterId

processAction (clID, serverInfo, clients, rooms) (AddRoom roomName roomPassword) = do

	let newServerInfo = serverInfo {nextRoomID = newID}

	let room = newRoom{

			roomUID = newID,

			name = roomName,

			password = roomPassword,

			roomProto = (clientProto client)

			}

	processAction (clID, serverInfo, clients, rooms) $ AnswerLobby ["ROOM", "ADD", roomName]

	processAction (

		clID,

		newServerInfo,

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

		insert newID room rooms

		) $ RoomAddThisClient newID

	where

		newID = (nextRoomID serverInfo) - 1

		client = clients ! clID

processAction (clID, serverInfo, clients, rooms) (RemoveRoom) = do

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

	processAction (clID, serverInfo, clients, rooms) $ 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 (clID, serverInfo, clients, rooms) (UnreadyRoomClients) = do

	processAction (clID, serverInfo, clients, rooms) $ AnswerThisRoom ("NOT_READY" : roomPlayers)

	return (clID,

		serverInfo,

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

		adjust (\r -> r{readyPlayers = 0}) rID rooms)

	where

		room = rooms ! rID

		rID = roomID client

		client = clients ! clID

		roomPlayers = Prelude.map (nick . (clients !)) roomPlayersIDs

		roomPlayersIDs = IntSet.elems $ playersIDs room

processAction (clID, serverInfo, clients, rooms) (RemoveTeam teamName) = do

	newRooms <-	if not $ gameinprogress room then

			do

			processAction (clID, serverInfo, clients, rooms) $ AnswerOthersInRoom ["REMOVE_TEAM", teamName]

			return $

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

		else

			do

			processAction (clID, serverInfo, clients, rooms) $ AnswerOthersInRoom ["EM", rmTeamMsg]

			return $

				adjust (\r -> r{

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

				leftTeams = teamName : leftTeams r,

				roundMsgs = roundMsgs r Seq.|> rmTeamMsg

				}) rID rooms

	return (clID, serverInfo, clients, newRooms)

	where

		room = rooms ! rID

		rID = roomID client

		client = clients ! clID

		rmTeamMsg = toEngineMsg $ 'F' : teamName

processAction (clID, serverInfo, clients, rooms) (CheckRegistered) = do

	writeChan (dbQueries serverInfo) $ CheckAccount (clientUID client) (nick client) (host client)

	return (clID, serverInfo, clients, rooms)

	where

		client = clients ! clID

processAction (clID, serverInfo, clients, rooms) (ClearAccountsCache) = do

	writeChan (dbQueries serverInfo) $ ClearCache

	return (clID, serverInfo, clients, rooms)

	where

		client = clients ! clID

processAction (clID, serverInfo, clients, rooms) (Dump) = do

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

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (ProcessAccountInfo info) = do

	case info of

		HasAccount passwd isAdmin -> do

			infoM "Clients" $ show clID ++ " has account"

			writeChan (sendChan $ clients ! clID) ["ASKPASSWORD"]

			return (clID, serverInfo, adjust (\cl -> cl{webPassword = passwd, isAdministrator = isAdmin}) clID clients, rooms)

		Guest -> do

			infoM "Clients" $ show clID ++ " is guest"

			processAction (clID, serverInfo, adjust (\cl -> cl{logonPassed = True}) clID clients, rooms) MoveToLobby

		Admin -> do

			infoM "Clients" $ show clID ++ " is admin"

			foldM processAction (clID, serverInfo, adjust (\cl -> cl{logonPassed = True, isAdministrator = True}) clID clients, rooms) [MoveToLobby, AnswerThisClient ["ADMIN_ACCESS"]]

processAction (clID, serverInfo, clients, rooms) (MoveToLobby) = do

	foldM processAction (clID, serverInfo, clients, rooms) $

		(RoomAddThisClient 0)

		: answerLobbyNicks

		++ [SendServerMessage]

		-- ++ (answerServerMessage client clients)

	where

		lobbyNicks = Prelude.map nick $ Prelude.filter logonPassed $ elems clients

		answerLobbyNicks = if not $ Prelude.null lobbyNicks then

					[AnswerThisClient (["LOBBY:JOINED"] ++ lobbyNicks)]

				else

					[]

processAction (clID, serverInfo, clients, rooms) (KickClient kickID) = do

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

processAction (clID, serverInfo, clients, rooms) (BanClient banNick) = do

	return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (KickRoomClient kickID) = do

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

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

processAction (clID, serverInfo, clients, rooms) (RemoveClientTeams teamsClID) = do

	liftM2 replaceID (return clID) $

		foldM processAction (teamsClID, serverInfo, clients, rooms) $ 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 (clID, serverInfo, clients, rooms) (AddClient client) = do

	let updatedClients = insert (clientUID client) client clients

	infoM "Clients" ((show $ clientUID client) ++ ": 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 isJust $ host client `Prelude.lookup` newLogins then

		processAction (clID, serverInfo{lastLogins = newLogins}, updatedClients, rooms) $ ByeClient "Reconnected too fast"

		else

		return (clID, serverInfo{lastLogins = (host client, connectTime client) : newLogins}, updatedClients, rooms)

processAction (clID, serverInfo, clients, rooms) PingAll = do

	(_, _, newClients, newRooms) <- foldM kickTimeouted (clID, serverInfo, clients, rooms) $ elems clients

	processAction (clID,

		serverInfo,

		Data.IntMap.map (\cl -> cl{pingsQueue = pingsQueue cl + 1}) newClients,

		newRooms) $ AnswerAll ["PING"]

	where

		kickTimeouted (clID, serverInfo, clients, rooms) client =

			if pingsQueue client > 0 then

				processAction (clientUID client, serverInfo, clients, rooms) $ ByeClient "Ping timeout"

				else

				return (clID, serverInfo, clients, rooms)

processAction (clID, serverInfo, clients, rooms) (StatsAction) = do

	writeChan (dbQueries serverInfo) $ SendStats (size clients) (size rooms - 1)

	return (clID, serverInfo, clients, rooms)