-- Module to display an icon with a tooltip such as "Edit this at Wikidata".
-- Icon will be linked to the Wikidata entry for the article where this is placed.
-- This message is only displayed if a local_parameter is not supplied
-- i.e. when called from a template, it can be coded not to display the message
-- when a local parameter is in use, preventing the value form Wikidata being fetched.
-- The qid of a Wikidata entry can optionally be supplied for testing outside the article.
-- Usage:
-- ((#invoke:EditAtWikidata|showMessage|local_parameter))
-- ((#invoke:EditAtWikidata|showMessage|qid=<ArticleID>|local_parameter))

local p = {}

local i18n =
{
	["message"] = "編輯維基數據鏈接"
}

p.showMessage = function(frame)
	-- There may be a local parameter supplied, if it's blank, set it to nil
	local local_parm =  mw.text.trim(frame.args[1] or "")
	if local_parm and (local_parm == "") then local_parm = nil end

	-- If there is a local parameter used, we don't want to display the message
	if local_parm then return nil end

	-- Can take a named parameter |qid which is the Wikidata ID for the article.
	-- This will not normally be used except for testing outside the article.
	local qid = frame.args.qid
	if qid and (qid == "") then qid = nil end

	-- The module can take a parameter pid=
	-- which will create a link to that property in the Wikidata entry for the article
	local propertyID = mw.text.trim(frame.args.pid or "")

	-- Get the object containing all the claims for the article
	local entity = mw.wikibase.getEntityObject(qid)
	if entity then
		local thisQid
		if qid then thisQid = qid else thisQid = entity.id end
		local link = "https://www.wikidata.org/wiki/" ..
			thisQid ..
			(propertyID == "" and "" or ("#" .. propertyID))
		-- https://www.mediawiki.org/wiki/Help:Images#Obtaining_the_full_URL_of_an_image
		local imageUrl = "((filepath:OOjs UI icon edit-ltr-progressive.svg))" 
		local linkStyle = "background-image: url('" .. imageUrl .. "');width: 10px;height: 10px;"
		return "<a href='" .. link .. "' title='" .. i18n.message .. "' style='" .. linkStyle .. "' />"
	end
end

return p