local getArgs = require('Module:Arguments').getArgs

local p = {}

local demo = function(s) return '<' .. string.sub(s,2,-8) .. '</span>' end

-- Protect against sortkey nesting.
-- Example: {{sort|{{dts|2013|07|07}}|{{dts|1990|12|01}}}}
local encode = function(s) return (string.find(s, "sortkey") or string.find(s, "data-sort-value"))
		and "" or mw.text.encode(s) end

function p._name(args)
	local sortkey = encode( ((args[4] or args.sort or '') ~= '')
		and (args[4] or args.sort)
		or ((args[2] or args.last or '{{{last}}}')..', '..(args[1] or args.first or '{{{first}}}')))
	local span = (args[1] or args.first or '{{{first}}}')..' '..(args[2] or args.last or '{{{last}}}')
	if ((args.nolink or '') == '') and ((args[1] or args.first or '')..(args[2] or args.last or '')..(args.dab or '') ~= '-') then
		if (args[3] or args.link or '') ~= '' then
			span = (args[3] or args.link) .. '|' .. span 
		elseif (args.dab or '') ~= '' then
			span = span .. ' (' .. args.dab .. ')|' .. span
		end
		span = '[[' .. span .. ']]'
	end
	local cat = (mw.title.getCurrentTitle().namespace == 0 and not args.demo)
		and '[[Category:Articles with hCards]]' or ''
	span = '<span data-sort-value="' .. sortkey ..
		'"><span class="vcard"><span class="fn">' .. span .. 
		'</span></span></span>'
	return (args.demo and demo(span) or span) .. cat
end

function p._sort(args)
	local span = '<span data-sort-value="' ..
		encode((args[1] or '{{{1}}}') .. ' !') .. '">' ..
		(args[2] or ('[['..(args[1] or '{{{1}}}')..']]')) .. '</span>'
	return args.demo and demo(span) or span
end

-- {{sortname}}
p.name = function (frame) return p._name( getArgs(frame, {removeBlanks = false}) ) end
-- {{sort}}
p.sort = function (frame) return p._sort( getArgs(frame, {removeBlanks = false}) ) end

return p