###
RetroChronal -- an iffy module for violating causality

Usage:
<pastresponse after="nev" future_cause="nev" [name="name"]>
	nev text
</pastresponse>

where the nev specified in "after" is the one that this nev should appear after, and the nev specified in future_cause is the one
that causes this nev to happen in the future.  If the nev specified in future_cause doesn't appear, this nev will not be displayed.
###

class ActorRetro
	constructor: (@story) ->
		@mpnevID_rgnevResponse = {}
		for dResponse in @story.jStory.find("pastresponse")
			@add(@story.NevByName($(dResponse).attr("after")), dResponse)
	add: (nev, dResponse) ->
		if not @mpnevID_rgnevResponse[nev.ID()]?
			@mpnevID_rgnevResponse[nev.ID()] = []
		@mpnevID_rgnevResponse[nev.ID()].push(new Nev($(dResponse)))
	EninevResponse: (nev, wst) ->
		rgnevTest = @mpnevID_rgnevResponse[nev.ID()]
		if rgnevTest?
			FKeepNevTest = (nevTest, eniNev, nevgen, respo) ->
				nevFuture = nevgen.wst.gst.story.NevByName($(nevTest.dNev).attr("future_cause"))
				return nevFuture? and nevgen.wst.gst.FWillNevRun(nevgen.wst, new EniFilter(eniNev, FKeepNevTest), nevgen, respo, nevTest, nevFuture)

			new EniFilter(new EniArray(rgnevTest), FKeepNevTest)
		else
			EniEmpty
	FilterStHtml: (stHtml, wst) -> stHtml

return (gst) ->
	gst.story.rgactor.splice(0, 0, new ActorRetro(gst.story))