function math.round(num, idp)
  assert(type(num) == "number", "math.round: wrong argument types (<number> expected for num)")
  assert(type(idp) == "number" or idp == nil, "math.round: wrong argument types (<integer> expected for idp)")
  local mult = 10 ^ (idp or 0)
  if num >= 0 then return math.floor(num * mult + 0.5) / mult
  else return math.ceil(num * mult - 0.5) / mult
  end
end

local reaktor = peripheral.wrap("back")
local chest = peripheral.wrap('chest_1')
local cell = peripheral.wrap('tile_thermalexpansion_cell_resonant_name_0')
local g = peripheral.wrap("right")

function addBg()
  g.addBox(1,1,200,80,0xFFFFFF,0.2)
end

function write()
  local energyMax = cell.getMaxEnergyStored()
  local energyStored = cell.getEnergyStored()

  g.addText(3,2,"Generated Rf/t: "..tostring(reaktor.getEnergyProducedLastTick()),0x000000)
  g.addText(3,12,"Control Rod Level: "..tostring(reaktor.getControlRodLevel(1)),0x000000)
  g.addText(3,22,"Reactor Status: ", 0x000000)
  if reaktor.getActive() then
    g.addText(85,22,"Online",0x00FF00)
  else
    g.addText(85,22,"Offline",0xFF0000)
  end
  g.addText(3,32,"Energy Stored: "..((energyStored/energyMax)*100).."%",0x000000)
  g.addText(3,42,"Fuel left: "..tostring(reaktor.getFuelAmount()+GetItemsInChest()*1000).."mB",0x000000)
  g.addText(3,52,"mB/t: "..tostring(reaktor.getFuelConsumedLastTick()),0x000000)

  local fuelticksleft = ((reaktor.getFuelAmount()+GetItemsInChest()*100)/reaktor.getFuelConsumedLastTick())
  local secleft = fuelticksleft/20
  local minleft = secleft/60
  local hourleft = minleft/60
  local daysleft = hourleft/24

  if daysleft > 1 then
   g.addText(3,62,"Time left: "..tostring(math.round(daysleft,2)).." Days",0x000000)
  elseif hourleft > 1 then
    g.addText(3,62,"Time left: "..tostring(math.round(hourleft,2)).." Hours",0x000000)
  elseif minleft > 1 then
    g.addText(3,62,"Time left: "..tostring(math.round(minleft,2)).." Minutes",0xFF00FF)
  elseif secleft > 1 then
    g.addText(3,62,"Time left: "..tostring(math.round(secleft,2)).." Seconds",0xFF00FF)
  elseif fuelticksleft > 1 then
    g.addText(3,62,"Time left: "..tostring(fuelticksleft).." Ticks",0xFF00FF)
  else
    g.addText(3,62," -- FUEL DEPLETED -- ",0xFF0000)
  end
end

function GetItemsInChest()
local yellorium = 0
  for i = 1, chest.getInventorySize() do
    local s = chest.getStackInSlot(i)
    if s then
      if s.display_name == "Yellorium Block" then
        yellorium = yellorium + s.qty*9
      elseif s.display_name == "Yellorium Ingot" or s.display_name == "Blutonium Ingot" then
        yellorium = yellorium + s.qty
      end
    end
  end
  return yellorium
end

function start()
  while true do
    g.clear()
    addBg()
    write()
    g.sync()
    sleep(1)
  end
end
start()