module Actions where

import Control.Concurrent.STM
import Control.Concurrent.Chan
import Data.IntMap
import qualified Data.IntSet as IntSet
import Monad
-----------------------------
import CoreTypes

data Action =
	AnswerThisClient [String]
	| AnswerAll [String]
	| AnswerAllOthers [String]
	| AnswerThisRoom [String]
	| AnswerOthersInRoom [String]
	| AnswerLobby [String]
	| RoomAddThisClient Int -- roomID
	| RoomRemoveThisClient
	| RemoveRoom
	| ProtocolError String
	| Warning String
	| ByeClient String
	| ModifyClient (ClientInfo -> ClientInfo)
	| ModifyRoom (RoomInfo -> RoomInfo)
	| AddRoom String String
	| Dump

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


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_ (\id -> writeChan (sendChan $ clients ! id) msg) (keys clients)
	return (clID, serverInfo, clients, rooms)


processAction (clID, serverInfo, clients, rooms) (AnswerAllOthers msg) = do
	mapM_ (\id -> writeChan (sendChan $ clients ! id) msg) $ Prelude.filter (/= clID) (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) (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
	mapM_ (processAction (clID, serverInfo, clients, rooms)) $ answerOthersQuit ++ answerInformRoom
	writeChan (sendChan $ clients ! clID) ["BYE"]
	return (
			0,
			serverInfo,
			delete clID clients,
			adjust (\r -> r{playersIDs = IntSet.delete clID (playersIDs r), playersIn = (playersIn r) - 1}) rID rooms
			)
	where
		client = clients ! clID
		rID = roomID client
		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 not $ Prelude.null clientNick 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) (RoomAddThisClient rID) = do
	processAction (
		clID,
		serverInfo,
		adjust (\cl -> cl{roomID = rID}) 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) = do
	when (rID /= 0) $ (processAction (clID, serverInfo, clients, rooms) $ AnswerOthersInRoom ["LEFT", nick client, "part"]) >> return ()
	return (
		clID,
		serverInfo,
		adjust (\cl -> cl{roomID = 0}) clID clients,
		adjust (\r -> r{playersIDs = IntSet.delete clID (playersIDs r), playersIn = (playersIn r) - 1}) rID $
			adjust (\r -> r{playersIDs = IntSet.insert clID (playersIDs r)}) 0 rooms
		)
	where
		rID = roomID client
		client = clients ! clID


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 clRoom]
	processAction (clID, serverInfo, clients, rooms) $ AnswerOthersInRoom ["ROOMABANDONED", name clRoom]
	return (clID,
		serverInfo,
		Data.IntMap.map (\cl -> if roomID cl == rID then cl{roomID = 0, isMaster = False} else cl) clients,
		delete rID $ adjust (\r -> r{playersIDs = IntSet.union (playersIDs clRoom) (playersIDs r)}) 0 rooms
		)
	where
		clRoom = rooms ! rID
		rID = roomID client
		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)