-- 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"] = "Edit this at Wikidata"
}

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 == 0) 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 == 0) 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 icon
		if propertyID then
			icon = " [[File:Blue pencil.svg |frameless |text-top |10px |alt=" .. i18n.message .. " |link=https://www.wikidata.org/wiki/" .. thisQid .. "#" .. propertyID .. "|" .. i18n.message .. "]]"
		else
			icon = " [[File:Blue pencil.svg |frameless |text-top |10px |alt=" .. i18n.message .. " |link=https://www.wikidata.org/wiki/" .. thisQid .. "|" .. i18n.message .. "]]"
		end
		
		return icon
	end

end


return p