implementation module Shares.mTaskShare

import dynamic_string
import Utils.SDS
import Utils.Devices
import iTasks
import mTask
import Data.List
import Data.Tuple
from Data.Func import $
from StdFunc import flip

derive class iTask MTaskShare

manageShares :: Task [MTaskDevice]
manageShares = whileUnchanged deviceStoreNP
	$ \devs->case devs of
		[] = viewInformation "No devices yet" [] []
		_ = allTasks (map manageSharesOnDevice devs)

manageSharesOnDevice :: MTaskDevice -> Task MTaskDevice
manageSharesOnDevice dev = (case dev.deviceShares of
		[] = viewInformation dev.deviceName [] "No shares yet"
		shs = enterChoice dev.deviceName [ChooseFromGrid id] shs @ const ""
	) >>| treturn dev

updateShares :: MTaskDevice ([MTaskShare] -> [MTaskShare]) -> Task [MTaskShare]
updateShares dev tfun = upd (map upFun) (sdsFocus (Just (dev, -1)) deviceStore)
		@ (\d->d.deviceShares) o fromJust o find ((==)dev)
	where
		upFun d = if (dev == d) ({d&deviceShares=tfun d.deviceShares}) d

//manageShares shares = withShared Nothing $ \cs->forever $
//	(viewSharesGrid cs shares -|| updateShares shares <<@ ArrangeVertical) 
//	@! ()

//updateShares :: [MTaskShare] -> Task BCValue
//updateShares shares = anyTask (map updateS shares) <<@ ArrangeWithTabs

//updateS :: MTaskShare -> Task BCValue
//updateS sh = flip (<<@) (Title $ toString sh.identifier) $ forever $
//		viewSharedInformation "Current value" [] (getSDSShare sh)
//	||- (
//			updateSharedInformation "New value" [] (getSDSShare sh)
//		>>= \nv->allTasks (map (withDevice treturn) sh.withDevice)
//		>>= \devs->allTasks (map (sendMessages [MTUpd sh.identifier nv]) devs)
//		>>| treturn nv
//		)
//	<<@ ArrangeHorizontal

//viewSharesGrid :: (Shared (Maybe MTaskShare)) [MTaskShare] -> Task [BCValue]
//viewSharesGrid _ [] = viewInformation "No shares yet" [] []
//viewSharesGrid cs sh = (allTasks [watch (getSDSShare m)\\m<-sh] <<@ NoUserInterface)
//	>&^ \st->flip (<<@) NoUserInterface $ whileUnchanged st $ \mshs->enterChoice "" [ChooseFromGrid id]
//		[{MTaskShare|ss&value=s}\\s<-fromJust mshs & ss<-sh]
//		>>* [OnValue (withValue $ \s->Just (set (Just s) cs))]
//		@! fromJust mshs

//viewShare :: MTaskShare -> Task BCValue
//viewShare m = viewSharedInformation "" [] (getSDSShare m)
//	<<@ Title ("SDS: " +++ toString m.identifier)

makeShare :: String Int BCValue -> MTaskShare
makeShare withTask identifier value = {MTaskShare
		|withTask=[withTask]
		,identifier=identifier
		,value=value
		}

import GenPrint, StdMisc, StdDebug, TTY
derive gPrint MTaskDevice, MTaskShare, Maybe, MTaskResource, MTaskTask, TaskId, TTYSettings, TCPSettings, DateTime
derive gPrint Parity, BaudRate, ByteSize

cleanSharesTask :: Int MTaskDevice -> Task [MTaskShare]
cleanSharesTask taskid d = updateShares d id //TODO
//# shares = d.deviceShares
//| not (trace_tn $ printToString taskid) = undef
//| not (trace_tn $ printToString d.deviceTasks) = undef
//| not (trace_tn $ printToString $ getNames taskid d) = undef
//= upd (map $ up $ getNames taskid d) sdsStore
//	where
//		getNames :: Int MTaskDevice -> [String]
//		getNames i d = [t.MTaskTask.name\\t<-d.deviceTasks|t.ident==i]
//		
//		up :: [String] MTaskShare -> MTaskShare
//		up ns s = {MTaskShare | s & withTask=[t\\t<-s.withTask|not (isMember t ns)]}

instance == MTaskShare where
	(==) a b = a.identifier == b.identifier

getRealShare :: MTaskDevice MTaskShare -> Shared BCValue
getRealShare dev share = sdsFocus ()
	$ mapReadWriteError (deviceLens dev share)
	$ sdsFocus (Just (dev, share.identifier))
	$ deviceStore

deviceLens dev share = (mread, mwrite)
where
	mread :: [MTaskDevice] -> MaybeError TaskException BCValue
	mread devs = case find ((==)dev) devs of
		Nothing = Error $ exception "Device doesn't exist anymore"
		Just {deviceShares} = case find ((==)share) deviceShares of
			Nothing = Error $ exception "Share doesn't exist anymore"
			Just share = Ok share.MTaskShare.value
	
	mwrite :: BCValue [MTaskDevice] -> MaybeError TaskException (Maybe [MTaskDevice])
	mwrite val devs = case partition ((==)dev) devs of
		([], _) = Error $ exception "Device doesn't exist anymore"
		([_,_:_], _) = Error $ exception "Multiple matching devices"
		([d=:{deviceShares}], devs) = case partition ((==)share) deviceShares of
			([], _) = Error $ exception "Share doesn't exist anymore"
			([_,_:_], _) = Error $ exception "Multiple matching shares"
			([s], shares)
				# s = {MTaskShare | s & value=val}
				# d = {MTaskDevice | d & deviceShares=[s:shares]}
				= Ok $ Just [d:devs]

updateShareFromPublish :: MTaskDevice Int BCValue -> Task BCValue
updateShareFromPublish dev ident val = set val 
	$ mapReadWriteError (deviceLens dev dummy)
	$ deviceStoreNP
where
	dummy = {MTaskShare|value=BCValue 0,identifier=ident,withTask=[]}