count

-- Initialize variables
local channel = 11
local countdownTime = 10
local delayBeforeCountdown = 4 -- Delay in seconds before starting the countdown

local modem = peripheral.find("modem")
local monitor = peripheral.find("monitor")

-- Get monitor dimensions
local width, height = monitor.getSize()

-- Open the channel
modem.open(channel)

-- Function to display text on a monitor
local function displayOnMonitor(text, y, scale)
  monitor.setTextScale(scale)
  local x = math.ceil((width - #text) / 2)  -- Calculate center based on text length
  monitor.setCursorPos(x, y)
  monitor.write(text)
end

-- Function to run the countdown
local function runCountdown()
  sleep(delayBeforeCountdown)  -- Wait for 4 seconds before starting the countdown

  -- Display "T-MINUS TO LAUNCH:" on the first line
  displayOnMonitor("T-MINUS TO LAUNCH:", 1, 1)

  for i = countdownTime, 0, -1 do
    monitor.setCursorPos(1, 2)
    monitor.clearLine()  -- Clear the line before displaying the new countdown number
    displayOnMonitor(tostring(i), 3, 3)  -- Big number at the center
    sleep(1)
  end

  monitor.clear()
  displayOnMonitor("LAUNCH!", 3, 3)  -- Display "LAUNCH!" at the end
end

-- Main loop to listen for messages
while true do
  print("Listening for 'start' on channel " .. channel .. ".")
  local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")

  if message == "start" then
    print("Received 'start', initiating countdown.")
    runCountdown()
  end
end