module miTask

import StdDebug, StdMisc

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

import iTasks
import mTask

derive class iTask MTaskMessage

Start :: *World -> *World
Start world = startEngine (withShared ([], False, [], False) mTaskTask) world
//Start world = startEngine mTaskTask world

mTaskTask :: (Shared ([MTaskMessage],Bool,[MTaskMessage],Bool)) -> Task ()
mTaskTask ch =
	syncNetworkChannel "localhost" 8124 "\n" decode encode ch ||-
	(
		sendMsg (hd msgs) ch >>= \_->
		sendMsg (hd (tl msgs)) ch >>= \_->
		viewSharedInformation "channels" [ViewWith lens] ch @! ()
	)
	where
		lens :: ([MTaskMessage],Bool,[MTaskMessage],Bool) -> ([String], [String])
		lens (r,_,s,_) = (map toString r, map toString s)

		msgs = toMessages 500 (toRealByteCode (unMain bc))

		bc :: Main (ByteCode Int Expr)
		bc = sds \x=0 In {main = x =. x +. lit 1}

makemTask :: Int (Main (ByteCode a Expr)) -> String
makemTask to bc
# (bc, st) = toRealByteCode (unMain bc)
= "t" +++ toString (toChar (to / 265))
	+++ toString (toChar (to rem 265)) +++ toString bc +++ "\n"

sendMsg :: MTaskMessage (Shared ([MTaskMessage],Bool,[MTaskMessage],Bool)) -> Task ()
sendMsg m ch
| not (trace_tn ("\'" +++ toString m +++ "\'")) = undef
= upd (\(r,rs,s,ss)->(r,rs,s ++ [m],ss)) 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)