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Implements {{percentage}}

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--
-- This module implements [[Template:Percentage]]
--
local p = {}

local math_module = require( "Module:Math" )
local precision = math_module._precision
local sortkey = require( "Module:Sortkey" )

local function rnd(num, digits)
	-- This function implements {{rnd}}
	return math_module._precision_format(tostring(num), digits)
end

local function oom(num)
	-- This function implements {{order of magnitude}}
	return math_module._order(tostring(num))
end

local function _nonscinote(num)
	-- This function undoes scientific notation
	while mw.ustring.match(num or '', '^.-?%d*%d%.%d+<span[^<>]*>×</span>10<sup>[%-−]*%d</sup>.-?$' ) do
		local pre,a,b,c,d,suf = mw.ustring.match(num or '', '^(.-?)(%d*%d)%.(%d+)<span[^<>]*>×</span>10<sup>([%-−]*)(%d)</sup>(.-?)$')
		d = tonumber(d) or 1
		if c ~= '' then
			num = pre .. '0.' .. mw.ustring.rep('0', d - 1) .. a .. b .. suf
		else
			num = pre .. a .. mw.ustring.sub(b .. mw.ustring.rep('0', d ), 1, d) .. suf
		end
	end
	return num
end

local function fmtout(num,snote)
	if snote then
		return _nonscinote(num)
	else
		return num
	end
end

function _percentage(n1, n2, prec, suffix, pad, sigfig, sn)
	local pct = 100*n1/n2
	skey = '<span data-sort-value="'
			.. sortkey._sortKeyForNumber(pct) .. '♠" style="display:none"></span>'

	-- prec = math.floor(prec)

	if sigfig ~= '' then
		if pct ~= 0 then
			return skey .. fmtout(rnd(pct, tonumber(sigfig) - oom(pct) - 1), sn) .. suffix
		else
			return skey .. fmtout(rnd(pct, tonumber(sigfig) - 3), sn) .. suffix
		end
	end
	if pad ~= '' then
		return skey .. fmtout(rnd(pct, prec), sn) .. suffix
	end
	
	prec = (prec < 0) and 0 or prec
	if pct ~= 0 then
		pct = ((pct < 0) and -1 or 1)*math.floor(math.abs(pct * 10^prec) + 0.5) / 10^prec
	end
	
	return skey .. fmtout(pct, sn) .. suffix
end

function p.main(frame)
	local args = frame.args[1] and frame.args or frame:getParent().args
	return _percentage(
		tonumber(args[1]) or 0,
		tonumber(args[2]) or 100,
		tonumber(args[3]) or tonumber(args['pad']) or 0,
		args['%'] or '%', args['pad'] or '',
		args['sigfig'] or '',
		(args['nonscinote'] or '') == 'y'
		)
end

function p.nonscinote(frame)
	local args = frame.args[1] and frame.args or frame:getParent().args
	return _nonscinote(args[1] or '')
end
return p