local p = {}



function p.wikidatacheck(frame)

	local pframe = frame:getParent()

	local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself

	local args = pframe.args -- the arguments passed TO the template, in the wikitext that transcludes the template



	local property = config.property

	local value = config.value or ""

	local catbase = config.category

	local namespaces = config.namespaces

	local nocatsame = config.nocatsame or ""

	local ignorecase = config.ignorecase or ""

	local qid = config.qid or ""

	local onlysourced = (config.onlysourced == 'yes') or false

	local ok = false -- one-way flag to check if we're in a good namespace

	local ns = mw.title.getCurrentTitle().namespace

	

	for v in mw.text.gsplit( namespaces, ",", true) do

		if tonumber(v) == ns then

			ok = true

		end

	end

	if not ok then -- not in one of the approved namespaces

		return ""

	end

	local entity

	if qid == "" then

		entity = mw.wikibase.getEntityObject()

	else

		entity = mw.wikibase.getEntityObject(qid)

	end

	if not entity then -- no Wikidata item

		return "[[Category:" .. catbase .. " not in Wikidata]]"

	end

	if value == "" then

		return nil -- Using Wikidata

	end

	local claims = entity.claims or {}

	local hasProp = claimsproperty

	if not hasProp then -- no claim of that property

		return "[[Category:" .. catbase .. " not in Wikidata]]" -- bad. Bot needs to add the property

	end

	if ignorecase ~= "" then

		value = string.lower( value )

	end

	for i, v in ipairs(hasProp) do -- Now we try to iterate over all possible values?

		propValue = (v.mainsnak.datavalue or {}).value

		if ignorecase ~= "" then

			propValue = string.lower( propValue )

		end

		local sourced = false -- check for external refs a la Module:WikidataIB onlysourced

		if v.references then

			for j, vr in ipairs(v.references) do

				local ref = mw.wikibase.renderSnaks(vr.snaks)

				if not ref:find("Wiki") then

					sourced = true

					break

				end

			end

		end

		if propValue == value and (not onlysourced or sourced) then

			if nocatsame == "" then

				return "[[Category:" .. catbase .. " same as Wikidata]]" -- yay!

			else

				return nil -- if nocatsame, the "same as" category is not added

			end

		end

	end

	return "[[Category:" .. catbase .. " different from Wikidata]]" -- needs human review :(

end



return p