--[[
	Module:Endangered Languages Project
--]]

local p = {}

local elpf = "http://www.endangeredlanguages.com/lang/" -- or get P1630

local make_display = function(elpc, elpn)
	return "[" .. elpf .. elpc .. " " .. elpn ..	"]"
end

local tidy_param = function(param)
	if param == "" then param = nil end
	return param
end

p.make_entry = function(frame)
	local elpname = tidy_param(frame.args.elpname)
	local elpcode = tidy_param(frame.args.elpcode)
	local qid = tidy_param((frame.args.qid or ""):upper()) or mw.wikibase.getEntityIdForCurrentPage()

	local out = {}
	if elpcode and elpname then
		out[#out+1] = make_display(elpcode, elpname)
	else
		if qid then
			local props = mw.wikibase.getBestStatements(qid, "P2192")
			if props[1] then
				for i, v in ipairs(props) do
					local elpc = elpcode or v.mainsnak.datavalue and v.mainsnak.datavalue.value
					local elpn = elpname or v.qualifiers["P1810"][1].datavalue and v.qualifiers["P1810"][1].datavalue.value
					if elpc and elpn then
						out[#out+1] = make_display(elpc, elpn)
					end
				end
			elseif elpcode or elpname then
				return (elpcode or "") .. (elpname or "") .. "[[Category:Language articles with missing ELP parameters]]"
			end
		else
			if elpcode or elpname then
				return (elpcode or "") .. (elpname or "") .. "[[Category:Language articles with missing ELP parameters]]"
			end
		end
	end

	local ret = ""
	if #out > 1 then
		ret = frame:expandTemplate{title = "ubl", args = out}
	else
		ret = out[1]
	end

	return ret
end

return p