Module:Weekly site information

local p = {}

local mw_error = require('Module:Error').error

local first = os.time{year=2024, month=9, day=8}
local diff = math.floor(os.difftime(os.time(), first) / 60 / 60 / 24 / 7)

function p._release(offset, number)
	offset = offset or 0
	number = (number or diff) + offset

	local end_date = os.date('*t', first)
	end_date.day = end_date.day + number * 7
	local start_date = {
		year = end_date.year,
		month = end_date.month,
		day = end_date.day - 7,
	}

	return string.format('Weekly Briefing Release %d %s - %s',
		number,
		os.date('%b %d', os.time(start_date)):gsub(' 0', ' '),
		os.date('%b %d', os.time(end_date)):gsub(' 0', ' ')
	)
end

function p._main(link_text, offset, number)
	link_text = link_text or ''

	if number then
		return '[[' .. p._release(offset, number) .. '|' .. link_text .. ']]'
	elseif offset then
		return '[[' .. p._release(offset) .. '|' .. link_text .. ']]'
	end

	-- Use the following code when mw.title.newBatch() becomes available
	-- local releases = {}
	-- for i = 1, -diff, -1 do
	-- 	table.insert(releases, p._release(i))
	-- end
	-- for _, release in ipairs(mw.title.newBatch(releases):lookupExistence():getTitles()) do
	-- 	if release.exists then
	-- 		return '[[' .. release.fullText .. '|' .. link_text .. ']]'
	-- 	end
	-- end

	for i = 1, -diff, -1 do
		release = p._release(i)
		mw.log(release)
		if mw.title.new(release).exists then
			return '[[' .. release .. '|' .. link_text .. ']]'
		end
	end

	return mw_error{'No Releases found. Something has gone very, very wrong.'}
end

function p.main(frame)
	local link_text = frame:getParent().args[1] or 'Weekly Site Information'
	local offset = tonumber(frame:getParent().args['offset'])
	local number = tonumber(frame:getParent().args['number'])
	return p._main(link_text, offset, number)
end

return p