local util = {}

function util.hexTorgb(str)
	if str:sub(1, 1) == "#" then
		str = str:sub(2, -1)
	end
	local r = tonumber(str:sub(1, 2), 16)
	local g = tonumber(str:sub(3, 4), 16)
	local b = tonumber(str:sub(5, 6), 16)
	return r, g, b
end

function util.rgbToHex(r, g, b)
	return ("#%02x%02x%02x"):format(r, g, b)
end

function util.lightenColour(c, n)
	local r, g, b = util.hexTorgb(c)
	r = math.min(math.max(r, n*1.1), 0xff)
	g = math.max(g, n)
	b = math.max(b, n*0.9)
	return util.rgbToHex(r, g, b)
end

return util