Users don’t shut down their PCs… so I built my own Idle Shutdown System in PowerShell

# Time in seconds for idle detection (10 hours)
$idleTime = 36000

# Countdown time in seconds (2 hours)
$countdownTime = 7200

# Define the script for the pop-up
Add-Type -AssemblyName PresentationFramework
Add-Type @"
using System;
using System.Runtime.InteropServices;

public static class IdleTime
{
    [StructLayout(LayoutKind.Sequential)]
    struct LASTINPUTINFO
    {
        public uint cbSize;
        public uint dwTime;
    }

    [DllImport("user32.dll")]
    static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

    public static uint GetIdleTime()
    {
        LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();
        lastInputInfo.cbSize = (uint)Marshal.SizeOf(typeof(LASTINPUTINFO));
        GetLastInputInfo(ref lastInputInfo);
        return ((uint)Environment.TickCount - lastInputInfo.dwTime) / 1000;
    }
}
"@

function Show-Popup {
    [void][System.Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms')
    [void][System.Reflection.Assembly]::LoadWithPartialName('System.Drawing')

    # Create form
    $form = New-Object Windows.Forms.Form
    $form.Text = "Idle Warning"
    $form.Size = New-Object Drawing.Size(500, 200)
    $form.StartPosition = "CenterScreen"
    $form.TopMost = $true

    # Label for the message
    $label = New-Object Windows.Forms.Label
    $label.Text = "The computer has been idle for 10 hours. The computer will shutdown after 2 hours."
    $label.AutoSize = $true
    $label.Location = New-Object Drawing.Point(10, 20)
    $form.Controls.Add($label)

    # Countdown label
    $countdownLabel = New-Object Windows.Forms.Label
    $countdownLabel.Text = "Time remaining: 02:00:00"
    $countdownLabel.AutoSize = $true
    $countdownLabel.Location = New-Object Drawing.Point(10, 60)
    $form.Controls.Add($countdownLabel)

    # Shutdown Now button
    $shutdownButton = New-Object Windows.Forms.Button
    $shutdownButton.Text = "Shutdown Now"
    $shutdownButton.Size = New-Object Drawing.Size(100, 40)
    $shutdownButton.Location = New-Object Drawing.Point(50, 100)
    $shutdownButton.Add_Click({
        Stop-Timer
        Shutdown-Computer
        $form.Close()
    })
    $form.Controls.Add($shutdownButton)

    # Cancel Shutdown button
    $cancelButton = New-Object Windows.Forms.Button
    $cancelButton.Text = "Cancel Shutdown"
    $cancelButton.Size = New-Object Drawing.Size(100, 40)
    $cancelButton.Location = New-Object Drawing.Point(200, 100)
    $cancelButton.Add_Click({
        Stop-Timer
        [System.Windows.Forms.MessageBox]::Show("Shutdown canceled.")
        $form.Close()
    })
    $form.Controls.Add($cancelButton)

    # Function to stop the timer
    function Stop-Timer {
        if ($global:timer) {
            $global:timer.Stop()
            $global:timer.Dispose()
        }
    }

    # Function to shutdown the computer
    function Shutdown-Computer {
        Stop-Timer
        Stop-Computer -Force
    }

    # Set up timer for countdown using System.Windows.Forms.Timer
    $global:timer = New-Object Windows.Forms.Timer
    $global:timer.Interval = 1000 # 1 second
    $global:timer.Add_Tick({
        $global:countdownTime -= 1
        $timeSpan = [System.TimeSpan]::FromSeconds($global:countdownTime)
        $countdownLabel.Text = "Time remaining: " + $timeSpan.ToString("hh\:mm\:ss")

        if ($global:countdownTime -le 0) {
            Shutdown-Computer
            $form.Close()
        }
    })

    $global:timer.Start()

    # Show the form
    $form.Add_Shown({$form.Activate()})
    [void]$form.ShowDialog()
}

# Idle detection loop
while ($true) {
    # Get the system idle time in seconds
    $idleSeconds = [IdleTime]::GetIdleTime()

    if ($idleSeconds -ge $idleTime) {
        Show-Popup
    }

    # Check every 60 seconds
    Start-Sleep -Seconds 60 
}