--[[

     Licensed under GNU General Public License v2
      * (c) 2013,      Luca CPZ
      * (c) 2010-2012, Peter Hofmann

--]]

local helpers = require('lain.helpers')
local wibox = require('wibox')
local gmatch, lines, floor = string.gmatch, io.lines, math.floor

-- Memory usage (ignoring caches)
-- lain.widget.mem

local function factory(args)
	args = args or {}

	local mem = { widget = args.widget or wibox.widget.textbox() }
	local timeout = args.timeout or 2
	local settings = args.settings or function() end

	function mem.update()
		mem_now = {}
		for line in lines('/proc/meminfo') do
			for k, v in gmatch(line, '([%a]+):[%s]+([%d]+).+') do
				if k == 'MemTotal' then
					mem_now.total = floor(v / 1024 + 0.5)
				elseif k == 'MemFree' then
					mem_now.free = floor(v / 1024 + 0.5)
				elseif k == 'Buffers' then
					mem_now.buf = floor(v / 1024 + 0.5)
				elseif k == 'Cached' then
					mem_now.cache = floor(v / 1024 + 0.5)
				elseif k == 'SwapTotal' then
					mem_now.swap = floor(v / 1024 + 0.5)
				elseif k == 'SwapFree' then
					mem_now.swapf = floor(v / 1024 + 0.5)
				elseif k == 'SReclaimable' then
					mem_now.srec = floor(v / 1024 + 0.5)
				end
			end
		end

		mem_now.used = mem_now.total - mem_now.free - mem_now.buf - mem_now.cache - mem_now.srec
		mem_now.swapused = mem_now.swap - mem_now.swapf
		mem_now.perc = math.floor(mem_now.used / mem_now.total * 100)

		widget = mem.widget
		settings()
	end

	helpers.newtimer('mem', timeout, mem.update)

	return mem
end

return factory