local p = {}
local getArgs = require('Module:Arguments').getArgs

function p.detect(frame)
	local title
	local args = getArgs(frame)
	if args.testTitle then
		title = mw.title.new(args.testTitle)
	else
		title = mw.title.getCurrentTitle()
	end
	local content = title:getContent() or ''
	local codes = string.match(content, "{{%s-[cC]ontentious [tT]opics/[aA]ware%s-|([^}]-)}}")
	local shortcutCodes = string.match(content, "{{%s-[cC][tT]/[aA]ware%s-|([^}]-)}}")
	local dsCodes = string.match(content, "{{%s-D[sS]/[aA]ware%s-|([^}]-)}}")
	if (not codes) and (not dsCodes) and (not shortcutCodes) then return end
	local text
	if ( codes ) then
		text = p._listToText(frame, mw.text.split(codes, "\n? *|"))
	elseif ( dsCodes ) then
		text = p._listToText(frame, mw.text.split(dsCodes, "\n? *|"))
	else
		text = p._listToText(frame, mw.text.split(shortcutCodes, "\n? *|"))
	end
	return frame:preprocess(
		"<div style = 'font-weight: bold'>It is not necessary to notify this user about the following topics being contentious topics:"
		..text..
		"\n The user has indicated that they are already aware using the template <nowiki>{{Contentious topics/aware}}</nowiki> on their talk page.</div>"
	)
end

function p.listToText(frame)
	return p._listToText(frame, getArgs(frame))
end

function p._listToText(frame, t)
	local new = {}
	local t = require('Module:TableTools').compressSparseArray(t)
	for i,v in ipairs(t) do
		table.insert(new, frame:expandTemplate{
			title = 'Contentious_topics/list',
			args = {["scope"] = require('Module:Wikitext Parsing').PrepareText(v)}})
	end
	return '\n*'..table.concat(new, '\n*')
end

return p