Teleport Controller

local modem = peripheral.find("modem") or error("No modem attached", 0)
CHANNEL = 43
modem.open(CHANNEL)

local function receiveMessage()
    local event, _, channel, _, message = os.pullEvent("modem_message")
    if channel == CHANNEL then
        return message
    else
        print("Failed: " .. message)
        return receiveMessage()
    end
end

-- Print a line of dashes for aesthetics
local function lineBreak()
    local width, height = term.getSize()
    for i = 1, width do
      io.write("-")
    end
    io.write("\n")
end
-- Function to clear the screen
local function clearScreen()
    term.clear()
    term.setCursorPos(1, 1)
end

local function finalmessage()
    for i = 1, 99 do
        message = receiveMessage()
        clearScreen()
        print("Teleporter Controller")
        lineBreak()
        print("Programming Complete")
        lineBreak()
        print(message)
    end

    clearScreen()
    print("Teleporter Controller")
    lineBreak()
    print("Teleport Completed")
    lineBreak()
    X, Y, Z = gps.locate()
    print("Final Position: " .. X .. " " .. Y .. " " .. Z)
end

clearScreen()
print("Teleporter Controller")
lineBreak()
print("Select a program to run:")
print("1. Recall")
print("2. Direct Teleport")
print("3. Relative Teleport")
print("4. Exit")
lineBreak()

local choice = read()

if choice == "1" then
    clearScreen()
    print("Teleporter Controller")
    lineBreak()
    modem.transmit(15, 43, "Recall")
    print("Recall Started")
    os.sleep(1)
    finalmessage()
elseif choice == "2" then
    clearScreen()
    print("Teleporter Controller")
    lineBreak()
    print("X: ")
    positionX = read()
    print("Y: ")
    positionY = read()
    print("Z: ")
    positionZ = read()

    clearScreen()
    print("Teleporter Controller")
    lineBreak()
    print("Starting Programming")
    lineBreak()
    modem.transmit(15, 43, "Teleport")
    os.sleep(1)
    modem.transmit(15, 43, positionX)
    print("X:"..positionX)
    os.sleep(1)
    modem.transmit(15, 43, positionY)
    print("Y:"..positionY)
    os.sleep(1)
    modem.transmit(15, 43, positionZ)
    print("Z:"..positionZ)
    os.sleep(1)

    finalmessage()
elseif choice == "3" then
    clearScreen()
    print("Teleporter Controller")
    lineBreak()
    X, Y, Z = gps.locate()
    print("X: ")
    positionX = X + read()
    print("Y: ")
    positionY = Y + read()
    print("Z: ")
    positionZ = Z + read()

    clearScreen()
    print("Teleporter Controller")
    lineBreak()
    print("Starting Programming")
    lineBreak()
    modem.transmit(15, 43, "Teleport")
    os.sleep(1)
    modem.transmit(15, 43, positionX)
    print("X:"..positionX)
    os.sleep(1)
    modem.transmit(15, 43, positionY)
    print("Y:"..positionY)
    os.sleep(1)
    modem.transmit(15, 43, positionZ)
    print("Z:"..positionZ)
    os.sleep(1)

    finalmessage()
end