Module:Weekly site information

local p = {}

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

local first_date = os.time{year=2024, month=9, day=8}
local curr_date = os.time()
local diff = os.difftime(curr_date, first_date) / (24 * 60 * 60)

local function release(offset)
	offset = offset or 0

	local release_num = math.floor(diff / 7) + offset

	local end_date = os.date("*t", curr_date - (diff % 7) * 24 * 60 * 60)
	end_date.day = end_date.day - (end_date.wday - 1) + offset * 7

	local start_date = os.date("*t", os.time{year=end_date.year, month=end_date.month, day=end_date.day - 7})

	return string.format("Weekly Briefing Release %d %s - %s",
		release_num,
		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)
	if offset then
		return "[[" .. release(offset) .. "|" .. link_text .. "]]"
	else
		for i=1,-math.floor(diff / 7),-1 do
			mw.log(release(i))
			if mw.title.new(release(i), "").exists then
				return "[[" .. release(i) .. "|" .. link_text .. "]]"
			end
		end
		return mw_error{"No Releases found. Something has gone very, very wrong."}
	end
end

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

return p