local component = require("component")
local sides = require("sides")
local term = require("term")
local os = require("os")

local old_stacks = {}

function display_chest_content(side)
  local items = component.inventory_controller.getAllStacks(side)
  if not items then
    return false
  end

  print("Listing inventory on side " .. side)

  local size = math.floor(component.inventory_controller.getInventorySize(side))

  local stacks = {}
  for k, v in ipairs(items) do
    if v.size > 1 then
      stacks[#stacks + 1] = v
    end
  end

  print(#stacks .. "/" .. size .. " stacks in inventory")

  table.sort(stacks, function(a, b) return a.size > b.size end)

  for n, stack in ipairs(stacks) do
    local diff = ""
    if old_stacks[stack.label] then
      diff = math.floor(stack.size - old_stacks[stack.label].size)
      if diff > 0 then
        diff = "+" .. tostring(diff)
      elseif diff <= 0 then
        diff = ""
      end
    end

    local mean = ""
    if old_stacks[stack.label] then
      old_stacks[stack.label] = {
        size=stack.size,
        total=(tonumber(diff) or 0) + old_stacks[stack.label].total,
        count=1 + old_stacks[stack.label].count
      }

      mean = old_stacks[stack.label].total / old_stacks[stack.label].count
      if mean > 0 then
        mean = "+" .. string.format("%2.1f", mean)
      elseif mean <= 0 then
        mean = ""
      end
    else
      old_stacks[stack.label] = {
        size=stack.size,
        total=0,
        count=0
      }
    end

    print(stack.label .. string.rep("\t", 3 - math.floor(#stack.label / 8)) .. "| " .. math.floor(stack.size) .. "\t| " .. diff .. "\t| " .. mean)
  end
end

local refresh = 0
while true do
  term.clear()
  print("Refreshed " .. refresh .. " times")
  for i = 0, 5 do
    display_chest_content(i)
  end
  os.sleep(60)
  refresh = refresh + 1
end