local meBridge = peripheral.wrap("left") -- Connect to ME Bridge on the left side
local monitor = peripheral.find("monitor") -- Find a connected monitor

if not meBridge then
    print("Error: ME Bridge not found on the left side!")
    return
else
    print("ME Bridge successfully detected!")
end

if not monitor then
    print("Error: No monitor found!")
    return
else
    print("Monitor successfully detected!")
    monitor.setTextScale(1) -- Set text scale for better visibility
end

-- Function to format numbers with commas
function formatNumber(num)
    local formatted = tostring(num)
    local k = 3
    while k < #formatted do
        formatted = formatted:sub(1, #formatted - k) .. "," .. formatted:sub(#formatted - k + 1)
        k = k + 4
    end
    return formatted
end

-- Function to calculate storage usage
function getStorageUsage()
    local itemUsage = meBridge.getUsedItemStorage() or 0
    local itemTotal = meBridge.getTotalItemStorage() or 1 -- Avoid division by zero

    local itemPercent = (itemUsage / itemTotal) * 100

    return {
        item = {
            used = itemUsage,
            free = itemTotal - itemUsage,
            total = itemTotal,
            percent = itemPercent
        }
    }
end

-- Function to center text on the monitor
function centerText(y, text, color)
    local w, _ = monitor.getSize()
    local x = math.floor((w - #text) / 2) + 1
    monitor.setCursorPos(x, y)
    if color then monitor.setTextColor(color) end
    monitor.write(text)
    monitor.setTextColor(colors.white) -- Reset text color
end

-- Function to update the monitor display
function updateMonitor()
    local storage = getStorageUsage()
    monitor.clear()

    centerText(1, "Item Storage", colors.yellow)
    centerText(2, "---------------------", colors.yellow)
    centerText(3, "Used: " .. formatNumber(storage.item.used) .. " | Free: " .. formatNumber(storage.item.free), colors.white)
    centerText(4, string.format("%.1f%% Used | %.1f%% Free", storage.item.percent, 100 - storage.item.percent), colors.white)
end

-- Continuously update the monitor
while true do
    updateMonitor()
    sleep(5) -- Updates every 5 seconds
end