Question Doublons générés lors du traitement import AD

$sam = "Albert"  
$i = 1
$sam = $sam + $i
$sam
Albert1

$sam = "Albert","Isaac"
$i = 1                 
$sam = $sam + $i       
$sam                   
Albert
Isaac
1

Function Remove-DiacriticsAndSpaces
{
Param(
[String]$inputString
)
#replace diacritics
$sb = [Text.Encoding]::ASCII.GetString([Text.Encoding]::GetEncoding("Cyrillic").GetBytes($inputString))

#remove spaces and anything the above function may have missed
return($sb -replace '[^a-z0-9]','')
}


$users = import-csv -path "C:\Users\Administrateur\Desktop\importusers.csv" -delimiter ";"

$AD_SAM = get-ADuser -filter * -SearchBase "DC=Mondomaine,DC=local" | Select-Object -ExpandProperty SamAccountName

$NewUsers = $users | ForEach-Object {
$sn = ($_.Nom).ToUpper() -replace '[ ]+',' '
$givenname = $_.Prenom
$Classe = $_.Classe
$identifiant = $_.identifiant
$ou = "OU=importusers,DC=Mondomaine,DC=local"
$description = 'GCU-ORG$ELEVE$' + $Classe
$SAM = $givenname.Substring(0,1).ToLower() + $sn.ToLower()


if ($AD_SAM -contains $SAM)
{
for ($i = 1 ; $AD_SAM -contains ($SAM + $i) ; $i++)
{
}
$SAM = $SAM + $i
}
$AD_SAM += $SAM

$SAM = $SAM.SubString(0, [Math]::Min(19, $SAM.length))
$SAM = Remove-DiacriticsAndSpaces -inputString $SAM


$CN = $sn + " " + $givenname + " " + "[$identifiant]"
$displayName = $CN
$UPN = $SAM + "@Mondomaine.local"
$userAccountControl = 66050
$CannotChangePassword = 1
$HomeDrive = "U"
$HomeDirectory = "\\test\test"
$ProfilePath = "C:\users"
$ScriptLogon = "test"
$Password = '{0}{1}' -f (get-random -Minimum 1000000 -Maximum 9999999), [char](get-random -Minimum 65 -Maximum 90)
$Password = $Password -replace '0',(Get-Random -Minimum 1 -Maximum 9) -replace 'O',[char](get-Random -Minimum 65 -Maximum 78)
$Secure_String_pwd = ConvertTo-SecureString $Password -AsPlainText -Force
$Enabled = 1


New-ADuser -displayName $displayName -Path $ou -Description $description -SamAccountName $SAM -givenname $givenname -Surname $sn -name $displayName -UserPrincipalName $UPN -PasswordNeverExpires $userAccountControl -CannotChangePassword $CannotChangePassword -HomeDrive $HomeDrive -HomeDirectory $HomeDirectory -ProfilePath $ProfilePath -ScriptPath $ScriptLogon -Enabled $Enabled -Accountpassword $Secure_String_pwd


[PSCustomObject]@{
Nom = $sn
Prenom = $givenname
OU = $ou
Description= $description
Login = $SAM
Lettre_lecteur = $HomeDrive
Dossier_personnel = $HomeDirectory
Chemin_profil = $ProfilePath
ScriptLogon = $ScriptLogon
Mot_de_passe = $Password
}

}

$NewUsers | Export-Csv -path "C:\Users\Administrateur\Desktop\export.csv" -Encoding "UTF8" -Append -NoTypeInformation -Delimiter ";"

if ($AD_SAM -contains $SAM) {
for ($i = 1 ; $AD_SAM -contains ($SAM + $i) ; $i++)
{
}
$SAM = $SAM + $i
}
$AD_SAM += $SAM

$SAM = $SAM.SubString(0, [Math]::Min(19, $SAM.length))
$SAM = Remove-DiacriticsAndSpaces -inputString $SAM

for ($i = 1 ; $AD_SAM -contains ($SAM + $i) ; $i++)
{
}
$SAM = $SAM + $i

$SAM = $SAM -replace '[^a-z A-Z 0-9]+','' -replace '[ ]',''
    if ($AD_SAM -contains $SAM)
    {
        for ($i = 1 ; ; $i++)
        {
            $SAMtmp = $SAM.SubString(0, [Math]::Min(19 - $i.ToString().Length, $SAM.length)) + $i.ToString()

            if ($AD_SAM -notcontains $SAMtmp)
            {
                $SAM = $SAMtmp
                break
            }
        }
    }
    $AD_SAM += $SAM

$SAM = $givenname.Substring(0,1).ToLower() + $sn.ToLower()


if ($AD_SAM -contains $SAM)
{
for ($i = 1 ; $AD_SAM -contains ($SAM + $i) ; $i++)
{
}
$SAM = $SAM + $i
}
$AD_SAM += $SAM

$SAM = $SAM.SubString(0, [Math]::Min(19, $SAM.length))
$SAM = Remove-DiacriticsAndSpaces -inputString $SAM