local longpress = require("awesome-longpress")
local wibox = require("wibox")
local gears = require("gears")
local beautiful = require ("beautiful")
local rw = {
 iconSize = 96,
 iconPath = gears.filesystem.get_configuration_dir() .. "/awesome-memwidget/"
}

local sizeTable = {[0] = "B", "K","M","G","T","P"}
local function formatSize(n)
 local i = 0
 while n > 1024 do
  n = n / 1024
  i = i + 1
 end
 return string.format("%0.1f%s",n,sizeTable[i])
end

function rw.new()
 local stack = wibox.widget{
  layout = wibox.layout.stack,
 }
 local bgimage = wibox.widget{
  widget = wibox.widget.imagebox,
  forced_width = rw.iconSize,
  forced_height = rw.iconSize,
  image = rw.iconPath .. "/media-memory.svg"
 }
 local rwidget = wibox.widget{
  layout = wibox.layout.grid.horizontal,
  wibox.container.constraint(stack,nil,rw.iconSize,rw.iconSize)
 }
 local memtext = wibox.widget{
  align = 'center',
  valign = 'bottom',
  widget = wibox.widget.textbox
 }
 local memused = wibox.widget{
  align = 'left',
  valign = 'bottom',
  visible = false,
  widget = wibox.widget.textbox
 }
 local memfree = wibox.widget{
  align = 'right',
  valign = 'bottom',
  visible = false,
  widget = wibox.widget.textbox
 }
 local membar = wibox.widget{
  widget = wibox.widget.progressbar,
  max_value = 1,
  border_width = 1,
  border_color = beautiful.border_color,
  color = beautiful.bg_focus,
  background_color = beautiful.bg_normal,
  forced_height = rw.iconSize / 6
 }
 function rwidget.update()
  local f = io.open("/proc/meminfo","rb")
  if not f then return true end
  local c = f:read("*a")
  local total = tonumber(c:match("MemTotal:%s+(%d+)"))
  local free = tonumber(c:match("MemFree:%s+(%d+)"))
  local buffers = tonumber(c:match("Buffers:%s+(%d+)"))
  local cache = tonumber(c:match("Cached:%s+(%d+)"))
  local totalUsed = total - free
  local used = totalUsed - (buffers + cache)
  memtext.text = (string.format("%3.0f%%", (used/total)*100))
  memused.text = formatSize(used*1024)
  memfree.text = formatSize((total-used)*1024)
  membar.value = (used/total)
  return true
 end
 stack:add(bgimage)
 stack:add(wibox.container.place(membar,"center","bottom"))
 stack:add(memused)
 stack:add(memfree)
 stack:add(memtext)
 rwidget.update()
 longpress.add(rwidget,function()
  memtext.visible = not memtext.visible
  memused.visible = not memused.visible
  memfree.visible = not memfree.visible
 end)
 return rwidget
end

function rw.all()
 return {rw.new()}
end

return rw