netserver/HWProto.hs
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module HWProto where
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import IO
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import Data.List
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import Data.Word
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import Miscutils
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import Maybe (fromMaybe, fromJust)
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-- 'noInfo' clients state command handlers
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handleCmd_noInfo :: Handle -> [ClientInfo] -> [RoomInfo] -> [String] -> ([ClientInfo], [RoomInfo], [Handle], [String])
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handleCmd_noInfo clhandle clients rooms ("NICK":newNick:[]) =
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	if not . null $ nick client then
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		(clients, rooms, [clhandle], ["ERROR", "The nick already chosen"])
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	else if haveSameNick then
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		(clients, rooms, [clhandle], ["WARNING", "Choose another nick"])
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	else
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		(modifyClient clhandle clients (\cl -> cl{nick = newNick}), rooms, [clhandle], ["NICK", newNick])
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	where
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		haveSameNick = not . null $ filter (\cl -> newNick == nick cl) clients
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		client = clientByHandle clhandle clients
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handleCmd_noInfo clhandle clients rooms ("PROTO":protoNum:[]) =
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	if protocol client > 0 then
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		(clients, rooms, [clhandle], ["ERROR", "Protocol number already known"])
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	else if parsedProto == 0 then
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		(clients, rooms, [clhandle], ["ERROR", "Bad input"])
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	else
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		(modifyClient clhandle clients (\cl -> cl{protocol = parsedProto}), rooms, [], [])
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	where
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		parsedProto = fromMaybe 0 (maybeRead protoNum :: Maybe Word16)
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		client = clientByHandle clhandle clients
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handleCmd_noInfo clhandle clients rooms _ = (clients, rooms, [clhandle], ["ERROR", "Bad command or incorrect parameter"])
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-- 'noRoom' clients state command handlers
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handleCmd_noRoom :: Handle -> [ClientInfo] -> [RoomInfo] -> [String] -> ([ClientInfo], [RoomInfo], [Handle], [String])
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handleCmd_noRoom clhandle clients rooms ("LIST":[]) =
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		(clients, rooms, [clhandle], ["ROOMS"] ++ map (\r -> name r) rooms)
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handleCmd_noRoom clhandle clients rooms ("CREATE":newRoom:roomPassword:[]) =
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	if haveSameRoom then
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		(clients, rooms, [clhandle], ["WARNING", "There's already a room with that name"])
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	else
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		(modifyClient clhandle clients (\cl -> cl{room = newRoom, isMaster = True}), (RoomInfo newRoom roomPassword):rooms, [clhandle], ["JOINS", nick client])
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	where
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		haveSameRoom = not . null $ filter (\room -> newRoom == name room) rooms
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		client = clientByHandle clhandle clients
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handleCmd_noRoom clhandle clients rooms ("CREATE":newRoom:[]) =
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	handleCmd_noRoom clhandle clients rooms ["CREATE", newRoom, ""]
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handleCmd_noRoom clhandle clients rooms ("JOIN":roomName:roomPassword:[]) =
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	if noSuchRoom then
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		(clients, rooms, [clhandle], ["WARNING", "There's no room with that name"])
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	else if roomPassword /= password (roomByName roomName rooms) then
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		(clients, rooms, [clhandle], ["WARNING", "Wrong password"])
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	else
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		(modifyClient clhandle clients (\cl -> cl{room = roomName}), rooms, clhandle : (fromRoomHandles roomName clients), ["JOINS", nick client])
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	where
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		noSuchRoom = null $ filter (\room -> roomName == name room) rooms
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		client = clientByHandle clhandle clients
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handleCmd_noRoom clhandle clients rooms ("JOIN":roomName:[]) =
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	handleCmd_noRoom clhandle clients rooms ["JOIN", roomName, ""]
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handleCmd_noRoom clhandle clients rooms _ = (clients, rooms, [clhandle], ["ERROR", "Bad command or incorrect parameter"])
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-- 'inRoom' clients state command handlers
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handleCmd_inRoom :: Handle -> [ClientInfo] -> [RoomInfo] -> [String] -> ([ClientInfo], [RoomInfo], [Handle], [String])
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handleCmd_inRoom clhandle clients rooms _ = (clients, rooms, [clhandle], ["ERROR", "Bad command or incorrect parameter"])
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-- state-independent command handlers
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handleCmd :: Handle -> [ClientInfo] -> [RoomInfo] -> [String] -> ([ClientInfo], [RoomInfo], [Handle], [String])
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handleCmd clhandle clients rooms ("QUIT":xs) =
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	if null (room client) then
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		(clients, rooms, [clhandle], ["QUIT"])
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	else if isMaster client then
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		(clients, filter (\rm -> room client /= name rm) rooms, roomMates, ["ROOMABANDONED"]) -- core disconnects clients on ROOMABANDONED command
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	else
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		(clients, rooms, roomMates, ["QUIT", nick client])
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	where
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		client = clientByHandle clhandle clients
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		roomMates = fromRoomHandles (room client) clients
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-- check state and call state-dependent commmand handlers
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handleCmd clhandle clients rooms cmd =
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	if null (nick client) || protocol client == 0 then
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		handleCmd_noInfo clhandle clients rooms cmd
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	else if null (room client) then
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		handleCmd_noRoom clhandle clients rooms cmd
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	else
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		handleCmd_inRoom clhandle clients rooms cmd
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	where
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		client = clientByHandle clhandle clients