local apiV, AB, MAJ, REV, ext, T = {}, {}, 2, 41, ...
if T.ActionBook then return end
apiV[MAJ], ext, T.Kindred = AB, {Kindred=T.Kindred}

local function assert(condition, err, ...)
	return condition or error(tostring(err):format(...), 3)((0)[0])
end
local safequote do
	local r = {u="\\117", ["{"]="\\123", ["}"]="\\125"}
	function safequote(s)
		return (("%q"):format(s):gsub("[{}u]", r))
	end
end
local listToString do
	local function walk(p, n, a, ...)
		if n == 0 then
			return p
		end
		local at, c = type(a), (p == "" and "" or ", ")
		if at == "string" then
			p = p .. c .. safequote(a)
		elseif at == "number" then
			p = p .. c .. ("%g"):format(a)
		else
			-- RE unpack does not accept start/finish indices, so replace nil/invalid values by a special table.
			p = p .. c .. (at == "boolean" and (a and "true" or "false") or "_NIL")
		end
		return walk(p, n-1, ...)
	end
	function listToString(...)
		return walk('', select("#", ...), ...)
	end
end
local istore do
	local function write(t, n, i, a, b, ...) -- overwrites by up to 1 element
		if n > 0 then
			t[i], t[i+1] = a, b
			return write(t, n-2, i+2, ...)
		end
		return i+n-1
	end
	local base, api, inner = newproxy(true), {}, setmetatable({}, {__mode="k"}), {}
	function istore()
		local r, d = newproxy(base), {[0]=0}
		inner[r] = d
		return r
	end
	function api:reset()
		local h = inner[self]
		h[0] = 0, wipe(h)
	end
	function api:insert(...)
		local h, n = inner[self], select("#", ...)
		if n > 0 then
			local c = h[0]
			h[0], h[-c-1] = c+1, write(h, n, h[-c]+1, ...)
		end
	end
	function api:filter(func, farg)
		local h, c, ni, first = inner[self], 0, 0, 0
		for i=1, h[0] do
			local last = h[-i]
			if securecall(func, farg, unpack(h, first+1, last)) then
				c, h[-c-1] = c + 1, ni + last-first
				for j=1,last == h[-c] and 0 or (last-first) do
					h[ni+j] = h[first+j]
				end
				ni = h[-c]
			end
			first = last
		end
		h[0] = c
	end
	function api:size()
		return inner[self][0]
	end
	function api:get(i)
		local h = inner[self]
		if i > 0 and h[-i] then
			return unpack(h, (i == 1 and 0 or h[-i+1]) + 1, h[-i])
		end
	end
	local meta = getmetatable(base)
	meta.__index, meta.__len, meta.__call = api, api.size, api.get
end

local L do
	local LT, LR = {}, newproxy(true)
	local function lookup(_, k, t)
		return LT[k] or t or k
	end
	local LM = getmetatable(LR)
	LM.__index, LM.__call, LM.__metatable = lookup, lookup, false
	T.ActionBook = {L=LR, LW=LT}
	L = T.ActionBook.L
end

local actionCallbacks, core, coreEnv = {}, CreateFrame("Frame", nil, nil, "SecureHandlerBaseTemplate") do
	core:SetFrameRef("KR", ext.Kindred:compatible(1,0):seclib())
	local function uniqueName(s)
		local bni, bn = 1 repeat
			bn, bni = "AB!" .. bni .. s, bni + 1
		until GetClickFrame(bn) == nil
		return bn
	end
	for s in ("0123456789QWERTYUIOP"):gmatch(".") do
		local b = CreateFrame("Button", uniqueName(s), core, "SecureActionButtonTemplate")
		b:SetAttribute("pressAndHoldAction", 1)
		core:WrapScript(b, "OnClick",
		[[-- AB:OnClick_Pre 
			local slot = tonumber(button)
			local at = actInfo[slot]
			local at1 = type(at) == "table" and at[1]
			if at == "icall" then
				owner:CallMethod("icall", slot)
			elseif at1 == "attribute" then
				busy[self], idle[self] = at
				for i=3, 2+at[2], 2 do
					self:SetAttribute(at[i], at[i+1])
				end
				return nil, at1
			elseif at1 == "recall" then
				busy[self], idle[self] = at
				local m = at[2]:RunAttribute(select(3, unpack(at)))
				if type(m) == "string" and m ~= "" then
					self:SetAttribute("type", "macro")
					self:SetAttribute("macrotext", m)
					return nil, "rem"
				end
				idle[self], busy[self] = self:GetName()
			end
			return false
		]], [[-- AB:OnClick_Post 
			local at = busy[self]
			idle[self], busy[self] = self:GetName()
			if message == "attribute" then
				for i=3, 2+at[2], 2 do
					self:SetAttribute(at[i], nil)
				end
			elseif message == "rem" then
				self:SetAttribute("type", nil)
				self:SetAttribute("macrotext", nil)
			end
		]])
	end
	core:SetAttribute("LM", uniqueName("LM"))
	core:WrapScript(CreateFrame("Button", core:GetAttribute("LM"), nil, "SecureFrameTemplate"), "OnClick", [=[-- AB_LockMan:OnClick 
		local d, lockID, v = button:match("^([lu])(%d+)")
		lockID = lockID and (lockID + 0)
		local v = (d == "l" and cndLockMap or cndLockRes)[lockID]
		if d == "l" and v then
			local ov = KR:GetAttribute("cndLock")
			KR:SetAttribute("cndLock", v)
			cndLockRes[lockID], cndLockMap[lockID] = ov == nil and _NIL or ov, nil
		elseif d == "u" and v then
			if v == _NIL then v = nil end
			KR:SetAttribute("cndLock", v)
			cndLockCount, cndLockRes[lockID] = cndLockCount - 1, nil
		end
	]=])
	core:Execute([=[-- AB_Init 
		collections, tokens, metadata, actConditionals, tokConditionals = newtable(), newtable(), newtable(), newtable(), newtable()
		actInfo, busy, idle, _NIL, sidCastID = newtable(), newtable(), newtable(), newtable(), 30 + math.random(9)
		actInfo[sidCastID] = newtable("attribute", 6, "spell",nil, "unit",nil, "type","spell")
		for _, c in pairs(self:GetChildList(newtable())) do idle[c] = c:GetName() end
		colStack, idxStack, ecStack, etStack, onStack, outCount = newtable(), newtable(), newtable(), newtable(), newtable(), newtable()
		cndLockNext, cndLockMap, cndLockRes, cndLockCount = 36000, newtable(), newtable(), 0
		KR, LMname  = self:GetFrameRef("KR"), self:GetAttribute("LM")
	]=])
	coreEnv = GetManagedEnvironment(core)
end
core:SetAttribute("GetCollectionContent", [[-- AB:GetCollectionContent(slot) 
	local i, ret, root, col, idx, aid, ecol = 1, "", tonumber((...)) or 0
	wipe(outCount) wipe(onStack)
	colStack[i], idxStack[i], ecStack[i], etStack[i] = root, 1, nil, nil
	repeat
		col, idx, ecol = colStack[i], idxStack[i], ecStack[i]
		if idx == 1 and not outCount[col] then
			if outCount[col] == nil then
				self:CallMethod("notifyCollectionOpen", col)
			end
			if not ecol then
				onStack[col], outCount[col] = true, 0
			end
		end
		aid, idxStack[i] = collections[col][idx], idx + 1
		if aid then
			local tok = tokens[col][idx]
			local check1, check2 = actConditionals[aid], tokConditionals[tok]
			if (check1 == nil or KR:RunAttribute("EvaluateCmdOptions", check1) or "hide") ~= "hide" and
			   (check2 == nil or KR:RunAttribute("EvaluateCmdOptions", check2) or "hide") ~= "hide" then
				local isCollection, etok = collections[aid], etStack[i]
				local tem = isCollection and metadata["tokEmbed-" .. tok]
				local isEmbed = isCollection and (tem == nil and metadata["embed-" .. aid] or tem)
				if isEmbed then
					local canEmbed = true
					for j=1, i-1 do
						if colStack[j] == aid then
							canEmbed = false
							break
						end
					end
					if canEmbed then
						i, colStack[i+1], idxStack[i+1], ecStack[i+1], etStack[i+1] = i + 1, aid, 1, ecol or col, ":" .. (etok and tok .. etok or tok)
					end
				elseif isCollection and not outCount[aid] then
					i, idxStack[i], colStack[i+1], idxStack[i+1], ecStack[i+1], etStack[i+1] = i + 1, idx, aid, 1, false, nil
				elseif (outCount[aid] or 1) > 0 or onStack[aid] then
					local col = ecol or col
					local nid = outCount[col] + 1
					local pm = metadata["prMode-" .. tok] or 0
					local tok = etok and tok .. etok or tok
					ret = ret .. "\n" .. col .. " " .. nid .. " " .. aid .. " " .. tok .. " " .. pm
					outCount[col] = nid
				end
			end
		else
			if not ecol then
				onStack[col] = nil
				local openAction = (i == 1 or (outCount[col] or 0) > 0) and metadata["openAction-" .. col]
				if openAction then
					local openToken = metadata["openToken-" .. col] or ("AOOA::" .. col)
					ret = ret .. "\n" .. col .. " 0 " .. openAction .. " " .. openToken .. " 0"
					if collections[openAction] and not outCount[openAction] then
						i, colStack[i], idxStack[i], ecStack[i], etStack[i] = i + 1, openAction, 1, false, nil
					end
				end
			end
			i = i - 1
		end
	until i == 0
	return ret, metadata["openAction-" .. root] -- 2nd return is deprecated; use idx 0 actions in ret
]])
core:SetAttribute("UseAction", [[-- AB:UseAction(slot[, "cndLock"]) 
	local slot, cndLock = ...
	local at, lockID = actInfo[slot]
	if not at then return "" end
	if type(cndLock) == "string" then
		lockID, cndLockCount, cndLockNext = cndLockNext, cndLockCount + 1, (cndLockNext % 1e9) + 1
		cndLockMap[lockID], cndLockRes[lockID] = cndLock, nil
	end
	local _, name = next(idle)
	return (lockID and "/click %3$s l%4$d\n/click %1$s %2$d 1\n/click %3$s u%4$d" or "/click %s %d 1"):format(name, slot, LMname, lockID)
]])
core:SetAttribute("CastSpellByID", [[-- AB:CastSpellByID(sid[, "target"]) 
	local at = actInfo[sidCastID]
	at[4], at[6] = ...
	return self:RunAttribute("UseAction", sidCastID)
]])
core:SetAttribute("ComputeModifierLock", [[-- DEPRECATED[2212/Y5]: AB:ComputeModifierLock 
	local mod, lock = ...
	local lock, modState = KR:RunAttribute("ComputeConditionalLock", mod, false, lock)
	return modState, lock
]])

function core:notifyCollectionOpen(id)
	AB:NotifyObservers("internal.collection.preopen", id)
end
function core:icall(id)
	local t = actionCallbacks[id]
	local ttype = type(t)
	if ttype == "table" then
		t[1](unpack(t,3,t[2]))
	elseif ttype == "function" then
		t()
	end
end
local DeferExecute do
	local q = {}
	function DeferExecute(block)
		if InCombatLockdown() then
			q[#q+1] = block
		elseif type(block) == "function" then
			securecall(block)
		else
			core:Execute(block)
		end
	end
	core:SetScript("OnEvent", function()
		for i=1,#q do
			q[i] = DeferExecute(q[i])
		end
	end)
	core:RegisterEvent("PLAYER_REGEN_ENABLED")
end
local checkEntryToken, reserveEntryToken do
	local etCollection, etIndex = {}, {}
	local rtKey, rtNS = {}, {}
	function checkEntryToken(tok, colId, newIdx)
		local c, r = etCollection[tok]
		if c and c ~= colId then
			return false
		end
		r, etCollection[tok], etIndex[tok] = etIndex[tok], colId, newIdx
		return r or newIdx
	end
	function reserveEntryToken(tok, colId, ns, key)
		local c = etCollection[tok]
		if c then
			return c == colId
		end
		local rk, rn = rtKey[tok], rtNS[tok]
		if rk == nil then
			rtKey[tok], rtNS[tok] = key, ns
			return true
		end
		return rk == key and rn == ns
	end
end

local actionCreators, actionDescribers, actionFlags, actionNumArgs, categories = {}, {}, {}, {}, {}
local nextActionId, allocatedActions, allocatedActionType, allocatedActionArg = 42, {}, {}, {}

local createHandlers, updateHandlers = {}, {}
function createHandlers.attribute(id, cnt, ...)
	DeferExecute(("actInfo[%d] = newtable(%s)"):format(id, listToString("attribute", cnt, ...)))
	return true
end
function createHandlers.func(id, cnt, func, ...)
	if type(func) ~= "function" then
		return false, "Callback expected, got %s", type(func)
	end
	DeferExecute(("actInfo[%d] = 'icall'"):format(id))
	actionCallbacks[id] = cnt > 1 and {func, cnt+1, ...} or func
	return true
end
function createHandlers.recall(id, _count, handle, attr, ...)
	if type(handle) ~= "table" or type(attr) ~= "string" then
		return false, "Frame handle, attribute method expected; got %s/%s", type(handle), type(attr)
	elseif type(handle.IsProtected) ~= "function" or type(handle.GetAttribute) ~= "function" then
		return false, "Frame handle expected; got %s", type(handle)
	elseif not select(2, handle:IsProtected()) then
		return false, "Callback frame must be explicitly protected"
	elseif type(handle:GetAttribute(attr)) ~= "string" then
		return false, "Callback snippet expected in attribute %q, got %s", attr, type(handle:GetAttribute(attr))
	end
	local s = ("local t = newtable(%s)\n t[2] = self:GetFrameRef('recall-ref')\nactInfo[%d] = t"):format(listToString("recall", nil, attr, ...), id)
	DeferExecute(function()
		core:SetFrameRef('recall-ref', handle)
		core:Execute(s)
	end)
	return true
end
function updateHandlers.collection(id, _count, idList)
	if not (type(idList) == "table") then
		return false, "Expected table specifying collection actions, got %q", type(idList)
	elseif idList.__openAction and not allocatedActions[idList.__openAction] then
		return false, "Collection __openAction key does not specify a valid action"
	end
	local spec, tokens, tail = "", "", ""
	for i=1,#idList do
		local tok = idList[i]
		if type(tok) ~= "string" then
			return false, "Collection entry #%d: unsupported entry token type (%s)", i, type(tok)
		end
		local aid, vis, emb, pmode = idList[tok], idList['__visibility-' .. tok], idList['__embed-' .. tok], idList['__pmode-' .. tok]
		if not tok:match("^[A-Za-z][A-Za-z0-9_=/]*$") then
			return false, "Collection entry #%d: improper entry token format (%s)", i, tok
		elseif allocatedActions[aid] == nil then
			return false, "Collection entry #%d: unallocated action id (%s:%s)", i, type(idList[i]), tostring(idList[i])
		elseif vis ~= nil and type(vis) ~= "string" then
			return false, "Collection entry #%d: improper visibility conditional type (%s)", i, type(vis)
		elseif emb ~= nil and type(emb) ~= "boolean" then
			return false, "Collection entry #%d: improper embed flag type (%s)", i, type(emb)
		elseif pmode ~= nil and (type(pmode) ~= "number" or pmode % 1 > 0 or pmode < 0) then
			return false, "Collection entry #%d: improper presentation mode type"
		end
		local uqi = checkEntryToken(tok, id, i)
		if not uqi then
			return false, "Collection entry #%d: entry token not globally unique (%s)", i, tok
		elseif uqi ~= i and idList[uqi] == tok then
			return false, "Collection entry #%d: entry token not locally unique (%s)", i, tok
		end
		vis = vis and safequote(vis) or "nil"
		emb = emb == nil and "nil" or tostring(emb)
		pmode = pmode and safequote(("%.0f"):format(pmode + 1 - pmode % 2)) or "nil"
		local qtok = safequote(tok)
		tail = ('%s\ntk = %s; tokConditionals[tk], metadata["tokEmbed-" .. tk], metadata["prMode-" .. tk] = %s, %s, %s'):format(tail, qtok, vis, emb, pmode)
		if i <= 240 then
			spec, tokens = spec .. aid .. ", ", tokens .. qtok .. ", "
		else
			tail = ('%s\nnc[%d], nt[%2$d] = %d, tk'):format(tail, i, aid)
		end
	end
	local openAction = type(idList.__openAction) == "number" and idList.__openAction or "nil"
	local openToken = idList.__openToken
	openToken = type(openToken) == "string" and openToken:match("^[A-Za-z][A-Za-z0-9_=/]*$") and safequote(openToken) or "nil"
	local embed = type(idList.__embed) == "boolean" and tostring(idList.__embed) or "nil"
	DeferExecute(([[-- AB_updateCollectionHandler 
		local id, nc, nt, tk = %d, newtable(%s nil), newtable(%s nil)
		collections[id], tokens[id], metadata['openAction-' .. id], metadata['embed-' .. id], metadata['openToken-' .. id] = nc, nt, %s, %s, %s;
		%s]]):format(id, spec, tokens, openAction, embed, openToken, tail))
	return true
end
function createHandlers.clone(id, _count, id2)
	DeferExecute(("local d,s = %d, %d; actInfo[d], actConditionals[d] = actInfo[s], actConditionals[s]"):format(id, id2))
	return true
end
local function nullInfoFunc() return false end

local getActionIdent, getActionArgs do
	function getActionIdent(identTable)
		local itt = type(identTable)
		if itt == "string" then
			return identTable, nil
		elseif itt == "table" and type(identTable[1]) == "string" then
			return identTable[1], identTable
		end
	end
	local function private_unpack(t, a, b)
		if a <= b then
			return t[a], private_unpack(t, a+1, b)
		end
	end
	function getActionArgs(it, ...)
		if it then
			return private_unpack(it, 2, 1+(actionNumArgs[it[1]] or 1))
		end
		return ...
	end
end
local categoryAliases = {}
local function getCategoryName(id)
	local LM = id == (#categories+1) and L"Miscellaneous"
	return categories[id] or (LM and categories[LM] and LM) or nil
end
local function getCategoryTable(name)
	name = categoryAliases[name] or name
	local r = categories[name]
	if not r then
		r = {}
		categories[name] = r
		if name ~= L"Miscellaneous" then
			categories[#categories + 1] = name
		end
	end
	return r
end
local function getActionDescription(q, ident, at, ...)
	local df = actionDescribers[ident]
	if df == nil then
	elseif actionFlags[ident] == 1 then
		return df(q, getActionArgs(at, ...))
	else
		return df(getActionArgs(at, ...))
	end
end

local editorPanels, createEditorHost = {} do
	local copyActionKeys, clearActionKeys do
		local function copy(t, copies)
			local into = {}
			copies = copies or {}
			copies[t] = into
			for k,v in pairs(t) do
				k = type(k) == "table" and (copies[k] or copy(k, copies)) or k
				v = type(v) == "table" and (copies[v] or copy(v, copies)) or v
				into[k] = v
			end
			return into, copies
		end
		local function copyKeys(src, dst, lib, n, k, ...)
			if n == 0 then return dst end
			local v = src and src[k]
			if lib and lib[v] ~= nil then
				v = lib[v]
			elseif type(v) == "table" then
				v, lib = copy(v, lib)
			end
			dst[k] = v
			return copyKeys(src, dst, lib, n-1, ...)
		end
		local function prefixCount(...)
			return select("#", ...), ...
		end
		local function allActionKeys(src, ak)
			local nk = next(src, ak)
			if nk == nil then
				return
			elseif type(nk) == "number" then
				return nk, allActionKeys(src, nk)
			end
			return allActionKeys(src, nk)
		end
		function copyActionKeys(src, dst)
			return copyKeys(src, dst, nil, prefixCount(allActionKeys(src)))
		end
		function clearActionKeys(dst)
			copyKeys(nil, dst, nil, prefixCount(allActionKeys(dst)))
		end
	end
	local hdata, hhproto = {}, newproxy(true) do
		local hhapi, m = {}, getmetatable(hhproto)
		m.__index, m.__metatable = hhapi, false
		local function pmcall(s, m, ...)
			return true, s[m](s, ...)
		end
		function hhapi:SetAction(actionTable)
			assert(type(actionTable) == "table", 'Syntax: ok = hh:SetAction(actionTable)')
			local d, ed = hdata[self], editorPanels[actionTable[1]]
			if not ed then return end
			local oed, oaction = d.editor, d.action
			d.editor, d.action = nil
			d.rq:Hide()
			if oed and oed ~= ed then
				securecall(oed.Release, oed, d.host)
			end
			--[[ There's a fair bit of copying involved here to avoid sharing table
			     references between the host and the editor panel. This serves to
			     protect both parties from each other. The host's copy cannot be
			     modified by the editor except when the host explicitly requests that
			     via :GetAction (limited to the action's option keys!). The copy the
			     editor panel receives is in principle solely its own, although other
			     code could call SetAction directly (with arbitrary arguments). ]]
			local edCopy = copyActionKeys(actionTable, {})
			if not securecall(pmcall, ed, "SetAction", d.host, edCopy) then
				securecall(ed.Release, ed, d.host)
				return false
			end
			d.editor = ed
			--[[ Keep a separate copy in case the editor is stolen from the host without
			     a :OnEditorRelease notification. When reacquiring the editor panel, it
			     is safe to keep the copy we're restoring from -- barring shenanigans,
			     it is immutable. ]]
			d.action = oaction == actionTable and oaction or copyActionKeys(actionTable, {})
			return true
		end
		function hhapi:GetAction(into)
			assert(type(into) == "table", 'Syntax: intoTable? = hh:GetAction(intoTable)')
			local d, src = hdata[self]
			if d.editor and d.editor:IsOwned(d.host) then
				src = {}
				d.editor:GetAction(src)
				d.action = copyActionKeys(src, {})
			elseif d.action then
				src = d.action
			end
			if src and actionCreators[src[1]] then
				clearActionKeys(into)
				copyActionKeys(src, into)
				return into
			end
		end
		function hhapi:Clear()
			local d = hdata[self]
			local ed = d.editor
			d.editor, d.action = nil
			d.rq:Hide()
			if ed then
				securecall(ed.Release, ed, d.host)
			end
		end
		function hhapi:IsCurrentEditor(ed)
			local d = hdata[self]
			return ed and ed == d.editor and ed:IsOwned(d.host) and true or false
		end
		function hhapi:GetTabFocusWidget(which)
			local d = hdata[self]
			local ed = d.editor
			return ed and type(ed.GetTabFocusWidget) == "function" and ed:IsOwned(d.host) and ed:GetTabFocusWidget(which) or nil
		end
	end
	local function hf_OnEditorRelease(hf, ed)
		local d = hdata[hf]
		if ed and ed == d.editor then
			local ac = {}
			ed:GetAction(ac)
			d.action = copyActionKeys(ac, {})
			d.editor = nil
			d.rq:Show()
		end
	end
	local function hf_OnReaquireClick(self)
		local d = hdata[self:GetParent()]
		PlaySound(SOUNDKIT.U_CHAT_SCROLL_BUTTON)
		if d.action then
			d.hh:SetAction(d.action)
			local w = d.hh:GetTabFocusWidget(0)
			if w then
				w:SetFocus()
			end
		end
	end
	function createEditorHost(parent)
		local hf = CreateFrame("Frame", nil, parent) do
			hf.OnEditorRelease = hf_OnEditorRelease
		end
		local rq = CreateFrame("Button", nil, hf, "UIPanelButtonTemplate") do
			rq:Hide()
			rq:SetSize(30, 26)
			rq:SetPoint("CENTER")
			rq:SetText("|A:UI-RefreshButton:0:0|a")
			rq:SetScript("OnClick", hf_OnReaquireClick)
		end
		local hd, hh = {host=hf, hh=0, rq=rq}, newproxy(hhproto)
		hd.hh = hh
		hdata[hh], hdata[hf] = hd, hd
		return hf, hh
	end
end

do -- AB:CreateToken()
	local seq, dict, dictLength, prefix = 262143, "qwer1tyui2opas3dfgh4jklz5xcvb6nmQWE7RTYU8IOPA9SDFG0HJKL=ZXCV/BNM", 64
	local function encode(n)
		local ret, d = ""
		repeat
			d = n % dictLength
			ret, n = dict:sub(d+1, d+1) .. ret, (n - d) / dictLength
		until n == 0
		return ret
	end
	function AB:CreateToken()
		if seq > 262142 then
			prefix, seq = "ABu" .. encode(time()*100+(math.floor(GetTime()*100)%100)), 0
		end
		seq = seq + 1
		return prefix .. encode(seq)
	end
end
function AB:ReserveToken(token, ns, key, collectionID)
	assert(key ~= nil and (collectionID == nil or type(collectionID) == "number"), 'Syntax: ok = ActionBook:ReserveToken("token", ns, key, collectionID or nil)')
	if type(token) ~= "string" or not token:match("^[A-Za-z][A-Za-z0-9_=/]*$") then
		return false, 'unacceptable-token'
	end
	return reserveEntryToken(token, collectionID, ns, key)
end

function AB:GetActionSlot(actionType, ...)
	local ident, at = getActionIdent(actionType)
	local id = actionCreators[ident] and actionCreators[ident](getActionArgs(at, ...))
	if allocatedActions[id] then
		return id
	end
	assert(ident, 'Syntax: actionId = ActionBook:GetActionSlot(actionTable or "actionType", ...)')
end
function AB:GetActionDescription(actionType, ...)
	local ident, at = getActionIdent(actionType)
	assert(ident, 'Syntax: typeName, actionName, icon, ext, tipFunc, tipArg, actionType = ActionBook:GetActionDescription(actionTable or "actionType", ...)')
	return getActionDescription(nil, ident, at, ...)
end
function AB:GetActionNumArgs(actionType)
	local ident = getActionIdent(actionType) or error('Syntax: numArgs? = ActionBook:GetActionNumArgs(actionTable or "actionType")', 2)
	return actionNumArgs[ident]
end
function AB:GetActionListDescription(actionType, ...)
	local ident, at = getActionIdent(actionType)
	assert(ident, 'Syntax: typeName, actionName, icon, ext, tipFunc, tipArg, actionType = ActionBook:GetActionListDescription(actionTable or "actionType", ...)')
	return getActionDescription("list-query", ident, at, ...)
end
function AB:GetSlotInfo(id, cndLock)
	assert(type(id) == "number" and (cndLock == nil or type(cndLock) == "string"), 'Syntax: usable, state, icon, caption, count, cdLeft, cdLength, tipFunc, tipArg, ext = ActionBook:GetSlotInfo(slot, "cndLockState"?)')
	if allocatedActions[id] then
		return allocatedActions[id](allocatedActionArg[id], cndLock)
	end
end
function AB:GetSlotImplementation(id)
	assert(type(id) == "number", "Syntax: actionType, colEntryCount, colEmbedDefault = ActionBook:GetSlotImplementation(slot)")
	local aType = allocatedActions[id] and allocatedActionType[id]
	local colData = coreEnv.collections[id]
	return aType, colData and #colData or nil, colData and coreEnv.metadata['embed-' .. id]
end

function AB:RegisterActionType(actionType, create, describe, numArgs, useListDescribe)
	assert(type(actionType) == "string" and type(create) == "function" and type(describe) == "function" and type(numArgs) == "number"
	       and (numArgs >= 0 and numArgs % 1 == 0)
	       and (useListDescribe == nil or type(useListDescribe) == "boolean")
	      , 'Syntax: ActionBook:RegisterActionType("actionType", createFunc, describeFunc, numArgs, useListDescribe?)')
	assert(not actionCreators[actionType], "Identifier %q is already registered", actionType)
	actionCreators[actionType], actionDescribers[actionType], actionFlags[actionType] = create, describe, useListDescribe and 1 or nil
	actionNumArgs[actionType] = numArgs
end
function AB:CreateActionSlot(infoFunc, infoArg, implType, ...)
	local as, an = 1, select("#", ...)
	local cnd if implType == "conditional" then
		as, an, cnd, implType = as + 2, an - 2, select(as, ...)
		assert(type(cnd) == "string", "Conditional options expected, got %s", type(cnd))
	end
	assert(type(implType) == "string" and (infoFunc == nil or type(infoFunc) == "function"), 'Syntax: slot = ActionBook:CreateAction(infoFunc, infoArg, "implType", ...)')
	local cf, id = assert(createHandlers[implType] or updateHandlers[implType], "Implementation type %q is not creatable", implType), nextActionId
	nextActionId, allocatedActionType[id], allocatedActionArg[id] = id + 1, implType, infoArg
	assert(cf(id, an, select(as, ...)))
	allocatedActions[id] = infoFunc or nullInfoFunc
	if cnd then DeferExecute(("actConditionals[%d] = %s"):format(id, safequote(cnd))) end
	return id
end
function AB:UpdateActionSlot(id, ...)
	assert(type(id) == "number", "Syntax: ActionBook:UpdateActionSlot(slot, ...)")
	local at = assert(allocatedActionType[id], "Action %d does not exist", id)
	local uf = assert(updateHandlers[at], "Action type %q is not updatable", at)
	assert(uf(id, select("#", ...), ...))
end

function AB:AddCategoryAlias(name, aliasOf)
	assert(type(name) == "string" and type(aliasOf) == "string", 'Syntax: ActionBook:AddCategoryAlias("name", "aliasOf")')
	assert(name == aliasOf or categories[name] == nil, "Category %q already exists.", name)
	categoryAliases[name] = categoryAliases[name] or aliasOf
end
function AB:AugmentCategory(name, augFunc)
	assert(type(name) == "string" and type(augFunc) == "function" and name ~= "*", 'Syntax: ActionBook:AugmentCategory("name", augFunc)')
	table.insert(getCategoryTable(name), augFunc)
end
function AB:AddActionToCategory(name, actionType, ...)
	assert(type(name) == "string" and type(actionType) == "string" and name ~= "*", 'Syntax: ActionBook:AddActionToCategory("name", "actionType"[, ...])')
	local ct = getCategoryTable(name)
	ct.extra = ct.extra or istore()
	ct.extra:insert(actionType, ...)
end
function AB:GetNumCategories()
	return #categories + (categories[L"Miscellaneous"] and 1 or 0)
end
function AB:GetCategoryInfo(id)
	assert(type(id) == "number", 'Syntax: name = ActionBook:GetCategoryInfo(index)')
	return getCategoryName(id)
end
function AB:GetCategoryContents(id, into)
	assert(type(id) == "number", 'Syntax: contents = ActionBook:GetCategoryContents(index[, into])')
	local cname, ret = assert(getCategoryName(id), 'Invalid category index'), into or istore()
	local co = categories[cname]
	local ex, addToRet = co.extra, #co > 0 and function(...) return ret:insert(...) end
	for i=1,#co do
		securecall(co[i], cname, addToRet)
	end
	for i=1,ex and #ex or 0 do
		ret:insert(ex(i))
	end
	return ret
end

local notifyCount, observers = 1, {["*"]={}, ["internal.collection.preopen"] = {}}
function AB:NotifyObservers(ident, data)
	assert(type(ident) == "string", 'Syntax: ActionBook:NotifyObservers("identifier"[, data])')
	assert(actionCreators[ident] or observers[ident] ~= nil, "Identifier %q is not registered", ident)
	notifyCount = (notifyCount + 1) % 4503599627370495
	for i=ident == "*" or not observers[ident] and 1 or 2, 1, -1 do
		for k,v in pairs(observers[i == 1 and "*" or ident]) do
			securecall(k, v, ident, data)
		end
	end
end
function AB:AddObserver(ident, callback, selfarg)
	assert(type(ident) == "string" and type(callback) == "function", 'Syntax: ActionBook:AddObserver("identifier", callbackFunc, callbackSelfArg)')
	assert(ident == "*" or actionCreators[ident] or observers[ident], "Identifier %q is not registered", ident)
	if observers[ident] == nil then observers[ident] = {} end
	observers[ident][callback] = selfarg == nil and true or selfarg
end
function AB:GetLastObserverUpdateToken(ident)
	assert(type(ident) == "string", 'Syntax: token = ActionBook:GetLastObserverUpdateToken("identifier")')
	assert(ident == "*" or actionCreators[ident], "Identifier %q is not registered", ident)
	return notifyCount
end

function AB:RegisterEditorPanel(actionType, editorPanel)
	assert(type(actionType) == "string" and type(editorPanel) == "table", 'Syntax: ActionBook:RegisterEditorPanel("actionType", editorPanel)')
	assert(actionCreators[actionType] ~= nil, "actionType %q is not registered", actionType)
	assert(editorPanels[actionType] == nil, "An editor for %q is already registered", actionType)
	assert(
		type(editorPanel.SetAction) == "function" and
		type(editorPanel.GetAction) == "function" and
		type(editorPanel.IsOwned) == "function" and
		type(editorPanel.Release) == "function",
	"Required editor panel API methods not implemented")
	editorPanels[actionType] = editorPanel
end

function AB:seclib()
	return core
end
function AB:compatible(module, maj, rev, ...)
	if ext[module] then
		return ext[module]:compatible(maj, rev, ...)
	elseif type(module) == "number" and type(maj) == "number" and rev == nil then
		maj, rev = module, maj -- Oh hey, it's us!
		return rev <= REV and apiV[maj], MAJ, REV
	end
end

-- HIDDEN, UNSUPPORTED METHODS: May vanish at any time.
local hum = {L=L}
setmetatable(AB, {__index=hum})
hum.HUM = hum
function hum:CreateEditorHost(parent)
	assert(type(parent) == "table" and parent[0], 'Syntax: hostWidget = ActionBook:CreateEditorHost(parent)')
	return createEditorHost(parent)
end
function hum:RegisterModule(key, api)
	assert(type(key) == "string" and type(api) == "table" and type(api.compatible) == "function", 'Syntax: ActionBook:RegisterModule("key", apiTable)')
	assert(ext[key] == nil, 'Duplicate module registration')
	ext[key] = api
end

T.ActionBook.compatible, ext.ActionBook = AB.compatible, T.ActionBook