Module:NUMBEROF

local p = {}

local function trimArg(arg)
	if arg == "" or arg == nil then
		return nil
	else
		return mw.ustring.lower(mw.text.trim(arg))
	end
end

local function tableLength(T)
	local count = 0
	for _ in pairs(T) do count = count + 1 end
	return count
end

-- Credit: http://lua-users.org/wiki/FormattingNumbers
local function comma_value(amount)
	local formatted = amount
	while true do
		local k
		formatted, k = string.gsub(formatted, "^(-?%d+)(%d%d%d)", '%1,%2')
		if k == 0 then
			break
		end
	end
	return formatted
end

function p.numberof(frame)
	local pframe = frame:getParent()
	local args = pframe.args
	local tname = "NUMBEROF"
	local result = -1
	local data = mw.ext.data.get("Wikipedia_statistics/data.tab") -- https://commons.wikimedia.org/wiki/Data:Wikipedia_statistics/data.tab

	local action = trimArg(args[1]) -- "ARTICLES, PAGES, EDITS, USERS, ACTIVEUSERS, ADMINS or FILES"
	if not action then
		error("Parameter 1 is missing. See [[Template:" .. tname .. "]] documentation")
	end
	local site = trimArg(args[2]) -- "en" or "en.wikipedia" or "en.wikiquote" etc..
	if not site then
		error("Parameter 2 is missing. See [[Template:" .. tname .. "]] documentation")
	end
	local site2split = mw.text.split(site, "%.")
	if tableLength(site2split) == 1 then
		site = site .. ".wikipedia"
	end
	local comma = trimArg(args[3]) -- If set to "N" use commas in output

	for k,v in pairs(data['data']) do
		if site == mw.ustring.lower(v[1]) then
			if action == "activeusers" then
				result = v[2]
			elseif action == "admins" then
				result = v[3]
			elseif action == "articles" then
				result = v[4]
			elseif action == "edits" then
				result = v[5]
			elseif action == "files" then
				result = v[6]
			elseif action == "pages" then
				result = v[7]
			elseif action == "users" then
				result = v[8]
			end
		end
	end
	if result > -1 and comma then
		result = comma_value(result)
	end
	return result
end

return p