# Setup
Set-Location $PSScriptRoot
CLS

# Variables
$ReportOnly = $true

# Install Microsoft Graph PowerShell SDK
If (Get-InstalledModule Microsoft.Graph.Users)
{
  Connect-Graph -Scopes "User.ReadWrite.All"
}
Else
{
  Write-Host "Microsoft Graph PowerShell module not found - please install it first." -ForegroundColor Black -BackgroundColor Yellow
  Write-Host "https://learn.microsoft.com/en-us/graph/sdks/sdk-installation#install-the-microsoft-graph-powershell-sdk"
  Exit
}

# List of users to be removed (email required)
[string[]]$UsersToRemove = Get-Content -Path .\UsersToRemove.txt

# Get all guest users and show
$GuestUsers = Get-MgUser -Filter "userType eq 'Guest'"
$GuestUsers | Out-GridView -Wait -Title "Found guest users"

# Delete user if in the list
$GuestUsers | ForEach-Object {
    If ($UsersToRemove.Contains($_.Mail))
    {
        # Output user
        Write-Host "The user is listed to be removed: $($_.Mail) ($($_.Id))"
        
        # Check if report mode
        If ($ReportOnly)
        {
            # Warning
            Write-Warning "User will not be removed - Report only mode."
        }
        Else
        {
            # Remove the user
            Remove-MgUser -UserId $_.Id
        }
    }
}

# Disconnect
# Disconnect-Graph