Add-Type -AssemblyName System.Windows.Forms

# Create the Windows Form
$form = New-Object System.Windows.Forms.Form
$form.Text = "Base64 to Hexadecimal Converter"
$form.Size = New-Object System.Drawing.Size(400, 250)
$form.StartPosition = "CenterScreen"

# Add a Label
$label = New-Object System.Windows.Forms.Label
$label.Text = "Paste Base64 String:"
$label.AutoSize = $true
$label.Location = New-Object System.Drawing.Point(10, 20)
$form.Controls.Add($label)

# Add a TextBox
$textBox = New-Object System.Windows.Forms.TextBox
$textBox.Size = New-Object System.Drawing.Size(360, 20)
$textBox.Location = New-Object System.Drawing.Point(10, 50)
$form.Controls.Add($textBox)

# Add a Convert Button
$convertButton = New-Object System.Windows.Forms.Button
$convertButton.Text = "Convert"
$convertButton.Location = New-Object System.Drawing.Point(10, 80)
$form.Controls.Add($convertButton)

# Add a TextBox for Hexadecimal Output
$outputBox = New-Object System.Windows.Forms.TextBox
$outputBox.ReadOnly = $true
$outputBox.Multiline = $true
$outputBox.ScrollBars = "Vertical"
$outputBox.Size = New-Object System.Drawing.Size(360, 60)
$outputBox.Location = New-Object System.Drawing.Point(10, 120)
$form.Controls.Add($outputBox)

# Add a Copy Button
$copyButton = New-Object System.Windows.Forms.Button
$copyButton.Text = "Copy to Clipboard"
$copyButton.Location = New-Object System.Drawing.Point(100, 80)
$copyButton.Enabled = $false
$form.Controls.Add($copyButton)

# Define the Convert button click event
$convertButton.Add_Click({
    try {
        # Get the Base64 string from the TextBox
        $base64String = $textBox.Text

        # Convert Base64 to a byte array
        $byteArray = [Convert]::FromBase64String($base64String)

        # Convert the byte array to hexadecimal
        $hexString = -join ($byteArray | ForEach-Object { "{0:X2}" -f $_ })

        # Display the hexadecimal string in the output TextBox
        $outputBox.Text = $hexString

        # Enable the Copy button
        $copyButton.Enabled = $true
    } catch {
        $outputBox.Text = "Error: Invalid Base64 string!"
        $copyButton.Enabled = $false
    }
})

# Define the Copy button click event
$copyButton.Add_Click({
    [System.Windows.Forms.Clipboard]::SetText($outputBox.Text)
    [System.Windows.Forms.MessageBox]::Show("Hexadecimal string copied to clipboard!", "Success")
})

# Show the form
[void]$form.ShowDialog()