#----------------------------------------------------------------------------#
# Program Copyright    : Mike Wilcock.
# Program Name         : device_reboot.ps1.
#----------------------------------------------------------------------------#
# Program Created      : 23rd May 2023.
# Program Code Type    : PowerShell Script (version 5.1.22621.436).
# Author               : Michael Wilcock, IT Technician.
#----------------------------------------------------------------------------#
# Version              : 2.10
#----------------------------------------------------------------------------#
# Purpose              : Reboot PC with user confirmation dialog box and timeout.
#----------------------------------------------------------------------------#

# Timeout in seconds.
$nTimeout = 30

# If set to true the reboot will not happen.  Set to false for production.
$debug_mode = $true

# Countdown timer.  Variable MUST be global in scope.
$global:nCountdown = $nTimeout

#----------------------------------------------------------------------------#
# Elegantly perform reboot.
#----------------------------------------------------------------------------#
# Notes: Function is called by the timer object and the reboot button click event.
#       
#        If memvar $debug_mode is $true perform a simulated reboot
#----------------------------------------------------------------------------#

function close_and_reboot()
{
    # Simulate reboot for testing.
    if($debug_mode -eq $true)
    {
        Restart-Computer -whatIf
    }
    # Production.
    else
    {
        Restart-Computer
    }
   
    # Close dialog window.
    $oDlg.Close()
}

#----------------------------------------------------------------------------#
# Update countdown timer label.
#----------------------------------------------------------------------------#
# Notes: Function is called every second by the timer object.  Uses globaly
#        scoped variable to store the seconds left until reboot happens.
#----------------------------------------------------------------------------#

function updCountdown()
{
    # Decrement countdown timer global variable.
    $global:nCountdown--
   
    # Update countdown label.
    $lbl_countdown.text = "Time To Restart: " + $global:nCountdown
}

#----------------------------------------------------------------------------#
# Main code.  Create dialog window, timer object and form components.
#----------------------------------------------------------------------------#

# Load windows forms class.
Add-Type -assembly System.Windows.Forms

$cMessage = "Device: " + $env:computername + " Requires A Reboot`n`nPlease select Cancel to delay the restart until further notice.`n`nIf no selection is made the device will restart after $nTimeout seconds!"
$cTitle = "[" + $env:computername + "] - " + "Automatic Device Restart"
$CenterScreen = [System.Windows.Forms.FormStartPosition]::CenterScreen;

# Button row in pixels.
$nBtnRow = 170

# Create our dialog window.
$oDlg = New-Object System.Windows.Forms.Form
$oDlg.Text = $cTitle
$oDlg.Width = 475
$oDlg.Height = 235
$oDlg.FormBorderStyle = 'Fixed3D'
$oDlg.MaximizeBox = $false
$oDlg.MinimizeBox = $false
$oDlg.StartPosition = $CenterScreen;
$oDlg.AutoSize = $true

# Create a timer.
$timer_reboot = New-Object System.Windows.Forms.Timer
$timer_reboot.Interval = $nTimeout * 1000

# Set up the event handler for the timer.
$timer_reboot.Add_Tick({close_and_reboot})

# Panel object.
$panel = New-Object System.Windows.Forms.Panel
$panel.Left = 0
$panel.Top = 0
$panel.Width = $oDlg.Width
$panel.Height = 61
$panel.BackColor = '255, 255, 255'
$panel.Dock = "top"

# Add panel to our form.
$oDlg.Controls.Add($panel)

# Add an image to the form using Base64.
$base64ImageString = "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"
$imageBytes = [Convert]::FromBase64String($base64ImageString)
$ms = New-Object IO.MemoryStream($imageBytes, 0, $imageBytes.Length)
$ms.Write($imageBytes, 0, $imageBytes.Length);
$nhs_logo = [System.Drawing.Image]::FromStream($ms, $true)

# picturebox object.
$pictureBox = new-object Windows.Forms.PictureBox
$pictureBox.Width =  $nhs_logo.Size.Width;
$pictureBox.Height =  $nhs_logo.Size.Height;
$pictureBox.Location = New-Object System.Drawing.Size(360,0)
$pictureBox.Image = $nhs_logo;

# Add picturebox to our form.
$oDlg.Controls.Add($pictureBox)

# User message label.
$lbl_message = New-Object System.Windows.Forms.Label
$lbl_message.Text = $cMessage
$lbl_message.Location  = New-Object System.Drawing.Point(10,80)
$lbl_message.AutoSize = $true

# Add label to our form.
$oDlg.Controls.Add($lbl_message)

# Countdown timer label.
$lbl_countdown = New-Object System.Windows.Forms.Label
$lbl_countdown.Text = "Time To Restart: " + $nCountdown
$lbl_countdown.Location  = New-Object System.Drawing.Point(10, $nBtnRow)
$lbl_countdown.ForeColor = "red"
$lbl_countdown.AutoSize = $true

# Add label to our form.
$oDlg.Controls.Add($lbl_countdown)

# Create a timer.
$timer_countdown = New-Object System.Windows.Forms.Timer
$timer_countdown.Interval = 1000

# Set up the event handler for the timer.
$timer_countdown.Add_Tick({updCountdown})

# Reboot button.
$btn_reboot = New-Object System.Windows.Forms.Button
$btn_reboot.Location = New-Object System.Drawing.Size(355, $nBtnRow)
$btn_reboot.Size = New-Object System.Drawing.Size(100, 23)
$btn_reboot.Text = "REBOOT NOW"

# Add button to our form.
$oDlg.Controls.Add($btn_reboot)

# Capture click event.
$btn_reboot.Add_Click({close_and_reboot})

# Cancel button.
$btn_cancel = New-Object System.Windows.Forms.Button
$btn_cancel.Location = New-Object System.Drawing.Size(255, $nBtnRow)
$btn_cancel.Size = New-Object System.Drawing.Size(100, 23)
$btn_cancel.Text = "Cancel"
$oDlg.Controls.Add($btn_cancel)

# Add button to our form.
$btn_cancel.Add_Click({$oDlg.Close()})

# IMPORTANT. Order items for correct display.
$oDlg.Controls.SetChildIndex($panel, 1)

# Start both timers.
$timer_reboot.Start()
$timer_countdown.Start()

# Let's do this thing!
$oDlg.ShowDialog()

# Dispose (stop) the timer. Doing this here instead of in the tick
# event handler ensures that the timer is stopped even when the form
# was closed by the user.
$timer_reboot.Dispose()
$timer_countdown.Dispose()

# Dispose the form and its controls. Skip, if you want to redisplay the form later.
$oDlg.Dispose()