param(
    [string]$Identity
)

try {
    # Import credentials and establish a PowerShell session to Exchange Server
    $serverAddress = Get-Content -Path ".\DefaultServer.txt"
    $currentDomain = ([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).Name
    $credential = Import-Clixml -Path ".\AdminCredential.xml"
    $session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://$serverAddress/PowerShell/ -Authentication Kerberos -Credential $credential
    Import-PSSession $session -DisableNameChecking

    # Ensure Identity is in the correct format
    if ($Identity -notlike "*@*") {
        $Identity = "$Identity@$currentDomain"
    }

    # Retrieve user details from Active Directory
    $user = Get-ADUser -Filter "UserPrincipalName -eq '$Identity'" -Property DisplayName, Department, Manager
    if ($user) {
        $DisplayName = $user.DisplayName
        $Department = $user.Department
        $ManagerDN = $user.Manager  # Distinguished Name of the manager

        # Retrieve Manager's Email
        $manager = Get-ADUser -Identity $ManagerDN -Property EmailAddress
        $ManagerEmail = $manager.EmailAddress

        # Debugging output
        Write-Host "DisplayName: $DisplayName" -ForegroundColor Yellow
        Write-Host "Department: $Department" -ForegroundColor Yellow
        Write-Host "Manager Email: $ManagerEmail" -ForegroundColor Yellow

        # Handle missing or empty variables
        if (-not $DisplayName) { $DisplayName = "Name not available" }
        if (-not $Department) { $Department = "Department not available" }
        if (-not $ManagerEmail) { $ManagerEmail = "Manager email not available" }

        # Set custom AutoReply message
        Set-MailboxAutoReplyConfiguration -Identity $Identity -AutoReplyState Enabled -ExternalAudience All -InternalMessage "<p>Thank you for your email. Please be informed that $DisplayName is no longer working at $Department.</p><p>This mailbox is currently unattended.</p><p>Please RE-SEND your enquiry to $ManagerEmail for further assistance.</p>" -ExternalMessage "<p>Thank you for your email. Please be informed that $DisplayName is no longer working at $Department.</p><p>This mailbox is currently unattended.</p><p>Please RE-SEND your enquiry to $ManagerEmail for further assistance.</p>"
        Write-Host "Custom AutoReply message set for $Identity." -ForegroundColor Green
    } else {
        Write-Host "User not found in Active Directory for $Identity." -ForegroundColor Red
    }

    # Remove the session after completing tasks
    Remove-PSSession $session
} catch {
    Write-Host "Failed to set AutoReply message for $Identity. Error:" -ForegroundColor Red
    Write-Host $_
}