local Pager = CreateFrame("Frame", nil, nil, "SecureHandlerBaseTemplate, SecureHandlerStateTemplate")
RegisterStateDriver(Pager, "actionpage", ConsolePort:GetActionPageDriver())
Pager:Execute("headers = newtable()")
Pager:SetAttribute("_onstate-actionpage", [[
	if HasVehicleActionBar() then
		newstate = GetVehicleBarIndex()
	elseif HasOverrideActionBar() then
		newstate = GetOverrideBarIndex()
	elseif HasTempShapeshiftActionBar() then
		newstate = GetTempShapeshiftBarIndex()
	elseif GetBonusBarOffset() > 0 then
		newstate = GetBonusBarOffset()+6
	else
		newstate = GetActionBarPage()
	end
	for header in pairs(headers) do
		header:SetAttribute("actionpage", newstate)
		if header:GetAttribute("pageupdate") then
			header:RunAttribute("pageupdate", newstate)
		end
	end
]])

--[[ Functions:
	GetActionID: Returns the correct ID for an action slot
	GetActionInfo: Returns information about an action slot
	GetActionSpellSlot: Returns spell information about an action slot
	IsHarmfulAction: Returns whether the action slot is harmful or not
	IsHelpfulAction: Returns whether the action slot is helpful or not
	IsNeutralAction: Returns whether the action slot has no particular target implication
]]

local functions = {
	GetActionID = [[
		local id = ...
		if id then
			local page = self:GetAttribute("actionpage")
			if id >= 1 and id <= 12 then
				return ( ( page - 1 ) * 12 ) + id
			else
				return id
			end
		end
	]],
	GetActionInfo = [[
		local id = self:RunAttribute("GetActionID", ...)
		return GetActionInfo(id)
	]],
	GetActionSpellSlot = [[
		local type, spellID, subType = self:RunAttribute("GetActionInfo", ...)
		if type == "spell" and spellID and subType == "spell" then
			return FindSpellBookSlotBySpellID(spellID)
		end
	]],
	IsHarmfulAction = [[
		local type, id = self:RunAttribute("GetActionInfo", ...)
		if type == "spell" then
			local slot = self:RunAttribute("GetActionSpellSlot", ...)
			if slot then
				return IsHarmfulSpell(slot, "spell")
			end
		elseif type == "item" then
			return IsHarmfulItem(id)
		end
	]],
	IsHelpfulAction = [[
		local type, id = self:RunAttribute("GetActionInfo", ...)
		if type == "spell" then
			local slot = self:RunAttribute("GetActionSpellSlot", ...)
			if slot then
				return IsHelpfulSpell(slot, "spell")
			end
		elseif type == "item" then
			return IsHelpfulItem(id)
		end
	]],
	IsNeutralAction = [[
		return self:RunAttribute("IsHelpfulAction", ...) == self:RunAttribute("IsHarmfulAction", ...)
	]],
}

function ConsolePort:RegisterSpellHeader(header)
	if not InCombatLockdown() then
		local _, current = self:GetActionPageDriver()
		
		header:SetAttribute("actionpage", current)

		header:SetFrameRef("actionBar", MainMenuBarArtFrame)
		header:SetFrameRef("overrideBar", OverrideActionBar)

		for name, func in pairs(functions) do
			header:SetAttribute(name, func)
		end

		Pager:SetFrameRef("header", header)
		Pager:Execute([[ headers[self:GetFrameRef("header")] = true ]])
	end
end

function ConsolePort:UnregisterSpellHeader(header)
	if not InCombatLockdown() then

	-- NYI
	--	Pager:SetFrameRef("header", header)
	--	Pager:Execute([[ headers[self:GetFrameRef("header")] = nil ]])

	--	header:SetFrameRef("actionBar", nil)
	--	header:SetFrameRef("overrideBar", nil)

	--	header:SetAttribute("actionpage", nil)
	--	header:SetAttribute("GetActionInfo", nil)
	--	header:SetAttribute("GetActionSpellSlot", nil)
	--	header:SetAttribute("IsHarmfulAction", nil)
	--	header:SetAttribute("IsHelpfulAction", nil)
	--	header:SetAttribute("IsNeutralAction", nil)
	end
end

