local time = 0
local storage = peripheral.wrap("back")
local mon = peripheral.find("monitor")
local w, h = mon.getSize()

-- The item you want to track and its fixed EMC value
local tracked_item = "projecte:rm_furnace"
local tracked_emc_value = 10059784

-- History buffer for EMC values and timestamps
local emc_history = {}

local function clear()
    mon.clear()
    mon.setTextScale(2)
end

function formatTime(sec)
    return string.format("%.2d:%.2d:%.2d", sec / (60 * 60), sec / 60 % 60, sec % 60)
end

function formatLargeNumber(n)
    local suffixes = {"", "K", "M", "B", "T", "Q"}
    local i = 1
    while n >= 1000 and i < #suffixes do
        n = n / 1000
        i = i + 1
    end
    return string.format("%.1f %s", n, suffixes[i])
end

-- Function to center text horizontally
local function centerText(line, text)
    local xPos = math.floor((w - #text) / 2) + 1
    mon.setCursorPos(xPos, line)
    mon.write(text)
end

clear()

while true do
    mon.clear()

    local emc = 0
    local amount = 0

    -- Iterate over each item in the storage container
    for slot, item in pairs(storage.list()) do
        if item.name == tracked_item then
            amount = amount + item.count
            emc = emc + (item.count * tracked_emc_value)
        end
    end

    -- Add current EMC and timestamp to history buffer
    table.insert(emc_history, {emc = emc, timestamp = os.clock()})

    -- Keep only the last 60 entries (~1 minute history)
    if #emc_history > 60 then
        table.remove(emc_history, 1)
    end

    -- Calculate EMC/m
    local emcrate = 0
    if #emc_history >= 2 then
        local first = emc_history[1]
        local last = emc_history[#emc_history]
        local emc_diff = last.emc - first.emc
        local time_diff = last.timestamp - first.timestamp

        if time_diff > 0 then
            emcrate = (emc_diff / time_diff) * 60  -- Scale to per minute
            emcrate = math.max(emcrate, 0)         -- Prevent negative rates
        end
    end

    -- Display Information (Centered)
    mon.setTextColor(colors.black)
    centerText(1, "EMC Monitor")

    centerText(3, "EMC: " .. formatLargeNumber(emc))
    centerText(4, "EMC/m: " .. formatLargeNumber(emcrate))
    centerText(5, "Time: " .. formatTime(time))
    centerText(6, "Amount: " .. formatLargeNumber(amount))

    time = time + 1
    sleep(1)
end