Read CSV and input into Active Directory through PowerShell - powershell

Question

I export a database into CSV. In the CSV there contains fields such as employeeid, first name, last name, email, position, description, and various fields. I am trying to populate those fields and all the other fields into Active Directory. The extracted CSV fields don't directly correlate to Active Directory. because of this, I need to check for double entries; if any.
To do this, I take the email address of a user in the CSV and do a search in Active Directory for the email address. I then try to take the same users employeeid and check to see if in Active Directory employeeid attribute is filled. If the employeeid attribute is filled, skip, if not, fill in the attribute from the CSV file.
I am having trouble inputting data from the CSV to Active Directory and also doing the check if employeeID exists in the attribute.
Import-Module ActiveDirectory
# ERROR REPORTING ALL
Set-StrictMode -Version latest
$newpath = "C:\Scripts\Test Files\book1.csv"
$log = "C:\Scripts\Test Files\import_employeeID.log"
$date = Get-Date
$addn = (Get-ADDomain).DistinguishedName
$dnsroot = (Get-ADDomain).DNSRoot
$i = 1
function Start-Commands {
Update-Users
}
function Update-Users {
"Processing started (on " + $date + "): " | Out-File $log -Append
"---------------------------------------" | Out-File $log -Append
Import-CSV $newpath | ForEach-Object {
$UserEmail = $_.EMAILID
$EmployeeID = $_.EMPLID
$LastName = $_.LAST_NAME
$FIRSTNAME = $_.FIRST_NAME
$UserEmail
} -Properties EmployeeID
$CheckUser = $user.employeeid
if ($CheckUser) {
Write-Host "$UserEmail $EmployeeID UPDATED"
"$UserEmail $EmployeeID UPDATED `r" | Out-File $log -Append
} else {
Get-ADUser -Identity $User | Set-ADUser -EmployeeID $EmployeeID
Get-ADUser -Identity $User | Set-ADUser -Replace #{info=$EmployeeID}
}
$i++
}
"--------------------------------------------" + "`r`n" | Out-File $log -Append
}
Write-Host "STARTED SCRIPT`r`n"
Start-Commands
Write-Host "STOPPED SCRIPT"