local y,w="\067\097\108\108\098\097\099\107\072\097\110\100\108\101\114-\049\046\048",8 local O=LibStub:NewLibrary(y,w)if not O then return end local H={__index=function(y,w)y[w]={}return y[w]end}local C,M=securecallfunction,error local T,I=setmetatable,rawget local b,t,z,x,e=next,select,pairs,type,tostring local function W(y,...)local w,O=b(y)if not O then return end repeat C(O,...)w,O=b(y,w)until not O end function O.New(y,w,O,C,X)O=O or"\082\101\103\105\115\116\101\114\067\097\108\108\098\097\099\107"C=C or"\085\110\114\101\103\105\115\116\101\114\067\097\108\108\098\097\099\107"if X==nil then X="\085\110\114\101\103\105\115\116\101\114\065\108\108\067\097\108\108\098\097\099\107\115"end local R=T({},H)local D={recurse=0,events=R}function D.Fire(O,y,...)if not I(R,y)or not b(R[y])then return end local H=D.recurse D.recurse=H+1 W(R[y],y,...)D.recurse=H if D.insertQueue and H==0 then for y,O in z(D.insertQueue)do local H=not I(R,y)or not b(R[y])for O,C in z(O)do R[y][O]=C if H and D.OnUsed then D.OnUsed(D,w,y)H=nil end end end D.insertQueue=nil end end w[O]=function(y,C,z,...)if x(C)~="\115\116\114\105\110\103"then M("\085\115\097\103\101\058 "..(O.."\040\101\118\101\110\116\110\097\109\101\044 \109\101\116\104\111\100\091\044 \097\114\103\093\041\058 \'\101\118\101\110\116\110\097\109\101\' - \115\116\114\105\110\103 \101\120\112\101\099\116\101\100\046"),2)end z=z or C local W=not I(R,C)or not b(R[C])if x(z)~="\115\116\114\105\110\103"and x(z)~="\102\117\110\099\116\105\111\110"then M("\085\115\097\103\101\058 "..(O.."\040\"\101\118\101\110\116\110\097\109\101\"\044 \"\109\101\116\104\111\100\110\097\109\101\"\041\058 \'\109\101\116\104\111\100\110\097\109\101\' - \115\116\114\105\110\103 \111\114 \102\117\110\099\116\105\111\110 \101\120\112\101\099\116\101\100\046"),2)end local X if x(z)=="\115\116\114\105\110\103"then if x(y)~="\116\097\098\108\101"then M("\085\115\097\103\101\058 "..(O.."\040\"\101\118\101\110\116\110\097\109\101\"\044 \"\109\101\116\104\111\100\110\097\109\101\"\041\058 \115\101\108\102 \119\097\115 \110\111\116 \097 \116\097\098\108\101\063"),2)elseif y==w then M("\085\115\097\103\101\058 "..(O..("\040\"\101\118\101\110\116\110\097\109\101\"\044 \"\109\101\116\104\111\100\110\097\109\101\"\041\058 \100\111 \110\111\116 \117\115\101 \076\105\098\114\097\114\121\058"..(O.."\040\041\044 \117\115\101 \121\111\117\114 \111\119\110 \'\115\101\108\102\'"))),2)elseif x(y[z])~="\102\117\110\099\116\105\111\110"then M("\085\115\097\103\101\058 "..(O..("\040\"\101\118\101\110\116\110\097\109\101\"\044 \"\109\101\116\104\111\100\110\097\109\101\"\041\058 \'\109\101\116\104\111\100\110\097\109\101\' - \109\101\116\104\111\100 \'"..(e(z).."\' \110\111\116 \102\111\117\110\100 \111\110 \115\101\108\102\046"))),2)end if t("\035",...)>=1 then local w=t(1,...)X=function(...)y[z](y,w,...)end else X=function(...)y[z](y,...)end end else if x(y)~="\116\097\098\108\101"and(x(y)~="\115\116\114\105\110\103"and x(y)~="\116\104\114\101\097\100")then M("\085\115\097\103\101\058 "..(O.."\040\115\101\108\102 \111\114 \"\097\100\100\111\110\073\100\"\044 \101\118\101\110\116\110\097\109\101\044 \109\101\116\104\111\100\041\058 \'\115\101\108\102 \111\114 \097\100\100\111\110\073\100\'\058 \116\097\098\108\101 \111\114 \115\116\114\105\110\103 \111\114 \116\104\114\101\097\100 \101\120\112\101\099\116\101\100\046"),2)end if t("\035",...)>=1 then local y=t(1,...)X=function(...)z(y,...)end else X=z end end if R[C][y]or D.recurse<1 then R[C][y]=X if D.OnUsed and W then D.OnUsed(D,w,C)end else D.insertQueue=D.insertQueue or T({},H)D.insertQueue[C][y]=X end end w[C]=function(y,O)if not y or y==w then M("\085\115\097\103\101\058 "..(C.."\040\101\118\101\110\116\110\097\109\101\041\058 \098\097\100 \'\115\101\108\102\'"),2)end if x(O)~="\115\116\114\105\110\103"then M("\085\115\097\103\101\058 "..(C.."\040\101\118\101\110\116\110\097\109\101\041\058 \'\101\118\101\110\116\110\097\109\101\' - \115\116\114\105\110\103 \101\120\112\101\099\116\101\100\046"),2)end if I(R,O)and R[O][y]then R[O][y]=nil if D.OnUnused and not b(R[O])then D.OnUnused(D,w,O)end end if D.insertQueue and(I(D.insertQueue,O)and D.insertQueue[O][y])then D.insertQueue[O][y]=nil end end if X then w[X]=function(...)if t("\035",...)<1 then M("\085\115\097\103\101\058 "..(X.."\040\091\119\104\097\116\070\111\114\093\041\058 \109\105\115\115\105\110\103 \'\115\101\108\102\' \111\114 \"\097\100\100\111\110\073\100\" \116\111 \117\110\114\101\103\105\115\116\101\114 \101\118\101\110\116\115 \102\111\114\046"),2)end if t("\035",...)==1 and...==w then M("\085\115\097\103\101\058 "..(X.."\040\091\119\104\097\116\070\111\114\093\041\058 \115\117\112\112\108\121 \097 \109\101\097\110\105\110\103\102\117\108 \'\115\101\108\102\' \111\114 \"\097\100\100\111\110\073\100\""),2)end for y=1,t("\035",...),1 do local O=t(y,...)if D.insertQueue then for y,w in z(D.insertQueue)do if w[O]then w[O]=nil end end end for y,H in z(R)do if H[O]then H[O]=nil if D.OnUnused and not b(H)then D.OnUnused(D,w,y)end end end end end end return D end
--[[ $Id: CallbackHandler-1.0.lua 1298 2022-12-12 15:10:10Z nevcairiel $ ]]
local MAJOR, MINOR = "CallbackHandler-1.0", 8
local CallbackHandler = LibStub:NewLibrary(MAJOR, MINOR)

if not CallbackHandler then return end -- No upgrade needed

local meta = {__index = function(tbl, key) tbl[key] = {} return tbl[key] end}

-- Lua APIs
local securecallfunction, error = securecallfunction, error
local setmetatable, rawget = setmetatable, rawget
local next, select, pairs, type, tostring = next, select, pairs, type, tostring


local function Dispatch(handlers, ...)
	local index, method = next(handlers)
	if not method then return end
	repeat
		securecallfunction(method, ...)
		index, method = next(handlers, index)
	until not method
end

--------------------------------------------------------------------------
-- CallbackHandler:New
--
--   target            - target object to embed public APIs in
--   RegisterName      - name of the callback registration API, default "RegisterCallback"
--   UnregisterName    - name of the callback unregistration API, default "UnregisterCallback"
--   UnregisterAllName - name of the API to unregister all callbacks, default "UnregisterAllCallbacks". false == don't publish this API.

function CallbackHandler.New(_self, target, RegisterName, UnregisterName, UnregisterAllName)

	RegisterName = RegisterName or "RegisterCallback"
	UnregisterName = UnregisterName or "UnregisterCallback"
	if UnregisterAllName==nil then	-- false is used to indicate "don't want this method"
		UnregisterAllName = "UnregisterAllCallbacks"
	end

	-- we declare all objects and exported APIs inside this closure to quickly gain access
	-- to e.g. function names, the "target" parameter, etc


	-- Create the registry object
	local events = setmetatable({}, meta)
	local registry = { recurse=0, events=events }

	-- registry:Fire() - fires the given event/message into the registry
	function registry:Fire(eventname, ...)
		if not rawget(events, eventname) or not next(events[eventname]) then return end
		local oldrecurse = registry.recurse
		registry.recurse = oldrecurse + 1

		Dispatch(events[eventname], eventname, ...)

		registry.recurse = oldrecurse

		if registry.insertQueue and oldrecurse==0 then
			-- Something in one of our callbacks wanted to register more callbacks; they got queued
			for event,callbacks in pairs(registry.insertQueue) do
				local first = not rawget(events, event) or not next(events[event])	-- test for empty before. not test for one member after. that one member may have been overwritten.
				for object,func in pairs(callbacks) do
					events[event][object] = func
					-- fire OnUsed callback?
					if first and registry.OnUsed then
						registry.OnUsed(registry, target, event)
						first = nil
					end
				end
			end
			registry.insertQueue = nil
		end
	end

	-- Registration of a callback, handles:
	--   self["method"], leads to self["method"](self, ...)
	--   self with function ref, leads to functionref(...)
	--   "addonId" (instead of self) with function ref, leads to functionref(...)
	-- all with an optional arg, which, if present, gets passed as first argument (after self if present)
	target[RegisterName] = function(self, eventname, method, ... --[[actually just a single arg]])
		if type(eventname) ~= "string" then
			error("Usage: "..RegisterName.."(eventname, method[, arg]): 'eventname' - string expected.", 2)
		end

		method = method or eventname

		local first = not rawget(events, eventname) or not next(events[eventname])	-- test for empty before. not test for one member after. that one member may have been overwritten.

		if type(method) ~= "string" and type(method) ~= "function" then
			error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - string or function expected.", 2)
		end

		local regfunc

		if type(method) == "string" then
			-- self["method"] calling style
			if type(self) ~= "table" then
				error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): self was not a table?", 2)
			elseif self==target then
				error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): do not use Library:"..RegisterName.."(), use your own 'self'", 2)
			elseif type(self[method]) ~= "function" then
				error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - method '"..tostring(method).."' not found on self.", 2)
			end

			if select("#",...)>=1 then	-- this is not the same as testing for arg==nil!
				local arg=select(1,...)
				regfunc = function(...) self[method](self,arg,...) end
			else
				regfunc = function(...) self[method](self,...) end
			end
		else
			-- function ref with self=object or self="addonId" or self=thread
			if type(self)~="table" and type(self)~="string" and type(self)~="thread" then
				error("Usage: "..RegisterName.."(self or \"addonId\", eventname, method): 'self or addonId': table or string or thread expected.", 2)
			end

			if select("#",...)>=1 then	-- this is not the same as testing for arg==nil!
				local arg=select(1,...)
				regfunc = function(...) method(arg,...) end
			else
				regfunc = method
			end
		end


		if events[eventname][self] or registry.recurse<1 then
		-- if registry.recurse<1 then
			-- we're overwriting an existing entry, or not currently recursing. just set it.
			events[eventname][self] = regfunc
			-- fire OnUsed callback?
			if registry.OnUsed and first then
				registry.OnUsed(registry, target, eventname)
			end
		else
			-- we're currently processing a callback in this registry, so delay the registration of this new entry!
			-- yes, we're a bit wasteful on garbage, but this is a fringe case, so we're picking low implementation overhead over garbage efficiency
			registry.insertQueue = registry.insertQueue or setmetatable({},meta)
			registry.insertQueue[eventname][self] = regfunc
		end
	end

	-- Unregister a callback
	target[UnregisterName] = function(self, eventname)
		if not self or self==target then
			error("Usage: "..UnregisterName.."(eventname): bad 'self'", 2)
		end
		if type(eventname) ~= "string" then
			error("Usage: "..UnregisterName.."(eventname): 'eventname' - string expected.", 2)
		end
		if rawget(events, eventname) and events[eventname][self] then
			events[eventname][self] = nil
			-- Fire OnUnused callback?
			if registry.OnUnused and not next(events[eventname]) then
				registry.OnUnused(registry, target, eventname)
			end
		end
		if registry.insertQueue and rawget(registry.insertQueue, eventname) and registry.insertQueue[eventname][self] then
			registry.insertQueue[eventname][self] = nil
		end
	end

	-- OPTIONAL: Unregister all callbacks for given selfs/addonIds
	if UnregisterAllName then
		target[UnregisterAllName] = function(...)
			if select("#",...)<1 then
				error("Usage: "..UnregisterAllName.."([whatFor]): missing 'self' or \"addonId\" to unregister events for.", 2)
			end
			if select("#",...)==1 and ...==target then
				error("Usage: "..UnregisterAllName.."([whatFor]): supply a meaningful 'self' or \"addonId\"", 2)
			end


			for i=1,select("#",...) do
				local self = select(i,...)
				if registry.insertQueue then
					for eventname, callbacks in pairs(registry.insertQueue) do
						if callbacks[self] then
							callbacks[self] = nil
						end
					end
				end
				for eventname, callbacks in pairs(events) do
					if callbacks[self] then
						callbacks[self] = nil
						-- Fire OnUnused callback?
						if registry.OnUnused and not next(callbacks) then
							registry.OnUnused(registry, target, eventname)
						end
					end
				end
			end
		end
	end

	return registry
end


-- CallbackHandler purposefully does NOT do explicit embedding. Nor does it
-- try to upgrade old implicit embeds since the system is selfcontained and
-- relies on closures to work.

