module miTask

import StdDebug, StdMisc

from Text import class Text(concat,join,split), instance Text String

import iTasks
import mTask

Start :: *World -> *World
Start world = startEngine mTaskTask world

mTaskTask :: Task ()
mTaskTask = withShared ([],False,[],False) (\ch->
		syncNetworkChannel "localhost" 8123 "\n" id id ch ||- 
		updateSharedInformation "channels" [] ch @! ())

syncNetworkChannel :: String Int String (String -> m) (m -> String) (Shared ([m],Bool,[m],Bool)) -> Task () | iTask m
syncNetworkChannel server port msgSeparator decodeFun encodeFun channel
	= tcpconnect server port channel {ConnectionHandlers|onConnect=onConnect,whileConnected=whileConnected,onDisconnect=onDisconnect} @! ()
	where
		onConnect _ (received,receiveStopped,send,sendStopped)
			= (Ok "",if (not (isEmpty send)) (Just (received,False,[],sendStopped)) Nothing, map encodeFun send,False)
		whileConnected Nothing acc (received,receiveStopped,send,sendStopped)
			= (Ok acc, Nothing, [], False)
		whileConnected (Just newData) acc (received,receiveStopped,send,sendStopped)
		# [acc:msgs] = reverse (split msgSeparator (concat [acc,newData]))
		# write = if (not (isEmpty msgs && isEmpty send))
			(Just (received ++ map decodeFun (reverse msgs),receiveStopped,[],sendStopped))
			Nothing
		= (Ok acc,write,map encodeFun send,False)
		
		onDisconnect l (received,receiveStopped,send,sendStopped)
			= (Ok l,Just (received,True,send,sendStopped))

consumeNetworkStream :: ([m] -> Task ()) (Shared ([m],Bool,[m],Bool)) -> Task () | iTask m
consumeNetworkStream processTask channel
	= ((watch channel >>* [OnValue (ifValue ifProcess process)]) <! id) @! ()
	where
		ifProcess (received,receiveStopped,_,_)
			= receiveStopped || (not (isEmpty received))

		process (received,receiveStopped,_,_)
			=   upd empty channel
			>>| if (isEmpty received) (return ()) (processTask received)
			@!  receiveStopped
		
		empty :: ([m],Bool,[m],Bool) -> ([m],Bool,[m],Bool)
		empty (_,rs,s,ss) = ([],rs,s,ss)