Computercraft Player detector

-- The name of the player to check for
local targetPlayer = "PlayerName"

-- Redstone output side (right)
local redstoneSide = "right"

-- Get the peripheral for the player detector, default to 'back'
local playerDetector = peripheral.wrap("back") -- Adjust the peripheral name if needed

-- Check if playerDetector is connected
if not playerDetector then
    error("Player detector peripheral not found on 'back'. Please check the connection.")
end

-- Function to display the splash screen
function displaySplashScreen(isPlayerOnline)
    if isPlayerOnline then
        term.setBackgroundColor(colors.green)
        term.setTextColor(colors.white)
        term.clear()
        term.setCursorPos(1, 1)

        local screenWidth, screenHeight = term.getSize()
        local message = "Lag Reducer 3001"
        local status = targetPlayer .. " is ONLINE!"
        local x1 = math.floor((screenWidth - #message) / 2)
        local y1 = math.floor(screenHeight / 2) - 1
        local x2 = math.floor((screenWidth - #status) / 2)
        local y2 = math.floor(screenHeight / 2) + 1

        term.setCursorPos(x1, y1)
        term.write(message)
        term.setCursorPos(x2, y2)
        term.write(status)
    else
        term.setBackgroundColor(colors.red)
        term.setTextColor(colors.white)
        term.clear()
        term.setCursorPos(1, 1)

        local screenWidth, screenHeight = term.getSize()
        local message = "Lag Reducer 3001"
        local status = targetPlayer .. " is OFFLINE."
        local x1 = math.floor((screenWidth - #message) / 2)
        local y1 = math.floor(screenHeight / 2) - 1
        local x2 = math.floor((screenWidth - #status) / 2)
        local y2 = math.floor(screenHeight / 2) + 1

        term.setCursorPos(x1, y1)
        term.write(message)
        term.setCursorPos(x2, y2)
        term.write(status)
    end
end

-- Function to check if the target player is online
function checkPlayerOnline()
    -- Get a list of online players from the playerDetector peripheral
    local onlinePlayers = playerDetector.getOnlinePlayers()

    -- Check if the target player is in the list of online players
    for _, player in ipairs(onlinePlayers) do
        if player == targetPlayer then
            return true -- Player is online
        end
    end
    return false -- Player is not online
end

-- Function to set the redstone output based on player status
function setRedstoneOutput(isPlayerOnline)
    if isPlayerOnline then
        redstone.setOutput(redstoneSide, true) -- Emit redstone signal
    else
        redstone.setOutput(redstoneSide, false) -- Turn off redstone signal
    end
end

-- Continuously check every few seconds
while true do
    local isOnline = checkPlayerOnline() -- Check if the player is online
    displaySplashScreen(isOnline) -- Show splash screen with player's status
    setRedstoneOutput(isOnline) -- Set the redstone output accordingly
    sleep(5) -- Check every 5 seconds
end