# Script to join domain inside of MDT.
# Technolog Networks, 2024-08-12
# iRaven

# General necessities.
$CompName = $env:COMPUTERNAME
$TSEnv = New-Object -ComObject Microsoft.SMS.TSEnvironment
$MDTPath = $Global:TSEnv.Value("DeployRoot")
Start-Transcript -Path "$MDTPath\_Logs\$CompName-JoinDomain.log" -Append
$CompType = $args[0]
$SubType = $args[1]

if ($CompType -like "WKS") {
    New-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\LSA" -Name NetJoinLegacyAccountReuse -Value 1
    $PCNamePrefix = ($CompName.Substring(0,$CompName.IndexOf("-")))
    # Domain credentials to join WKS to domain
    . "$MDTPath\_Scripts\Credentials-MDTJoinDomain.ps1"

    Write-Host "Auto-detecting computer name $CompName..."
    # Filter out OUs
    if ($PCNamePrefix -like "XH") {
        Write-Host "Detected computer name as XH - domain joining to Personal WKS OU"
        $DomainOU = "OU=Personal,OU=Workstations,DC=technolog,DC=net"
    }
    elseif ($PCNamePrefix -like "TNG" -or $PCNamePrefix -like "NH" -or $PCNamePrefix -like "IR") {
        Write-Host "Detected computer name as TNG, NH, or IR - domain joining to Standard WKS OU"
        $DomainOU = "OU=Generic,OU=Workstations,DC=technolog,DC=net"
    }
    elseif ($PCNamePrefix -like "TEST") {
        Write-Host "Detected computer name as TEST - domain joining to Testing WKS OU"
        $DomainOU = "OU=TestingWKS,OU=Workstations,DC=technolog,DC=net"
    }
    else {
        Write-Host "Computer name is unusual - domain joining to Standard WKS OU"
        $DomainOU = "OU=Workstations,DC=technolog,DC=net"
    }
} elseif ($CompType -like "Server") {
    $DomainCredential = Get-Credential -Message "To join this server to the domain, enter your domain credentials."
    # Filter out SubType var for server tiers
    if ($null -ne $SubType) {
        $DomainOU = "OU=$SubType,OU=Domain Servers,DC=technolog,DC=net"
    } else {
        $DomainOU = "OU=Domain Servers,DC=technolog,DC=net"
    }
} elseif ($CompType -like "Utility") {
    . "$MDTPath\_Scripts\Credentials-MDTJoinDomain.ps1"

    Write-Host "Domain joining to Utility OU"
    $DomainOU = "OU=Utility,DC=technolog,DC=net"
} else {
    . "$MDTPath\_Scripts\Credentials-MDTJoinDomain.ps1"
    Write-Host "Domain joining to generic Computers OU"
}


if ([boolean](get-variable "DomainOU" -ErrorAction SilentlyContinue)) {
    try {
        Add-Computer -DomainName technolog.net -Credential $DomainCredential -OUPath $DomainOU -Restart
    } catch {
        Write-Host "Couldn't join the domain with OU $DomainOU"
    }
}
else {
    try {
        Add-Computer -DomainName technolog.net -Credential $DomainCredential -Restart
    } catch {
        Write-Host "Couldn't join the domain!"
    }
}

Stop-Transcript