Module:NUMBEROF

local p = {}

local function trimArg(arg, i)
	arg = mw.text.trim(arg or '')
	if arg == '' then
		if i then
			error('Parameter ' .. i .. ' is missing. See [[Template:NUMBEROF]] documentation')
		end
		return nil
	end
	return mw.ustring.lower(arg)
end

local function getIfLocal(site, action)
	-- If wanted site is the local site where module is running,
	-- return numberof result for given action, or nil.
	-- This is faster than reading the cached table, and gives the current value.
	local localSite = string.match(mw.site.server, '.*//(.*)%.org$')  -- examples: 'en.wikipedia', 'commons.wikimedia'
	if site == localSite then
		if action == 'activeusers' then
			action = 'activeUsers'
		end
		return mw.site.stats[action]
	end
end

function p.numberof(frame)
	local args = frame:getParent().args
	local action = trimArg(args[1], 1)  -- activeusers, admins, articles, edits, files, pages, users
	if action:sub(1, 8) == 'numberof' then  -- numberofX is an alias for X
		action = trimArg(action:sub(9), 1)
	end
	local site = trimArg(args[2], 2)  -- "en" or "en.wikipedia" or "en.wikiquote" etc.
	if not site:find('.', 1, true) then
		site = site .. '.wikipedia'
	end
	local wantComma = trimArg(args[3])  -- nil for no commas in output; "N" or anything nonblank inserts commas
	local result
	if site == 'en2.wikipedia' then
		site = 'en.wikipedia'  -- get cached data rather than live values
	else
		result = getIfLocal(site, action)
	end
	if not result then
		local data = mw.loadData('Module:NUMBEROF/data')
		local map = data.map
		data = data.data
		result = data[site]
		if result then
			result = result[map[action]]
		end
	end
	if result then
		if wantComma then
			result = mw.getContentLanguage():formatNum(result)
		end
		return result  -- number or formatted string
	end
	return '-1'
end

return p