[PSHELL]#https://github.com/HeiligerMax
#Licensed under GNU General Public License v3.0

#Get control over the Powershell window
Add-Type -Name Window -Namespace Console -MemberDefinition '
[DllImport("Kernel32.dll")]
public static extern IntPtr GetConsoleWindow();
[DllImport("user32.dll")]
public static extern bool ShowWindow(IntPtr hWnd, Int32 nCmdShow);
'
$consolePtr = [Console.Window]::GetConsoleWindow()
###
#Add WPF
Add-Type -AssemblyName PresentationFramework
[xml]$xaml = @"
<Window x:Name="Window"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Remote-Assistant" Width="300" WindowStartupLocation="CenterScreen" FontFamily="Microsoft Sans Serif" FontSize="16" SizeToContent="Height" WindowStyle="ToolWindow" ResizeMode="NoResize">
<StackPanel>
<ComboBox x:Name="InputField" Margin="5" Padding="5" IsEditable="True" VerticalAlignment="Top" ToolTip="The whole or part of Hostname"/>
<Button x:Name="Button" Content="Search and connect" Margin="5" Padding="5" VerticalAlignment="Top" IsDefault="True" ToolTip="Search for the Hostname in AD"/>
<TextBox x:Name="OutputField" Margin="5" Padding="5" TextWrapping="Wrap" Text="Ready" HorizontalContentAlignment="Center" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" IsReadOnly="True"/>
</StackPanel>
</Window>
"@
$reader = (New-Object System.Xml.XmlNodeReader $xaml)
$window = [Windows.Markup.XamlReader]::Load($reader)
###
$InputField = $window.FindName("InputField")
$Button = $window.FindName("Button")
$OutputField = $window.FindName("OutputField")
$Button.Add_Click{(offerra)}
###
function offerra{
$Search = $InputField.Text
if([string]::IsNullOrWhiteSpace($InputField.Text)){
$OutputField.Text = "No input"
return
}

$OutputField.Text = "Looking for computer"
$PC = Get-ADComputer -Filter "Name -like '*$Search*'" | Select-Object -ExpandProperty Name

if($PC.Count -gt 1){
$OutputField.Text += "`r`nMore than one computer found"
$PC | ForEach-Object{$InputField.Items.Add($_)}
$InputField.Text = "Please select a computer"
$InputField.IsDropDownOpen = $true
return
}elseif($null -eq $PC){
$OutputField.Text += "`r`nNo Computer found."
$BoxAntwort = [System.Windows.MessageBox]::Show("No computer found!`r`nConnect to $Search anyway?",":(","YesNo","Error")
if($BoxAntwort -eq "Yes"){
$OutputField.Text += "`r`Connecting"
msra.exe /offerra $Search
}
$OutputField.Text = "Ready"
return
}

$InputField.Text = "$PC"
$OutputField.Text += "`r`nTesting connection"
if(Test-NetConnection -ComputerName $PC -InformationLevel Quiet){
$OutputField.Text += "`r`Connecting`r`n"
msra.exe /offerra $PC
$InputField.Items.Clear()
$InputField.Text =""
$OutputField.Text = "Ready"
}else{
$OutputField.Text += "`r`n$PC not reachable!"
}
}
###
#Hide Powershell when GUI appears and bring it back if GUI gets closed
[void][Console.Window]::ShowWindow($consolePtr, 0)
[void]$window.ShowDialog()
[void][Console.Window]::ShowWindow($consolePtr, 4)
[/PSHELL]