Random ad user generator

#
#
#preset variables for the script:
#

$date = Get-date -format M.d.yyyy
$ou="OU=LANDING,DC=DEFAULTDOMAIN,DC=COM"
$principlename = "@DEFAULT.com"
$description = "Test Account Generate $date"
$Number_of_users = "5000"
$company = "Test Company"
#Supported Nationalities: AU, BR, CA, CH, DE, DK, ES, FI, FR, GB, IE, IR, NL, NZ, TR, US
#Comma seperated values for multiple ie:
#$nationalities ="US,DK,FR"
$nationalities ="US"

#
#end of preset variables for script:
#


function find_ad_id($first,$last) {
    $first = $first -Replace "\s*"
    $last = $last -Replace "\s*"
    $not_found = $true
    for($i = 1; $i -le $first.length; $i++) {
    $Sam_account =""
    $letters_first = ""

        for($l = 0; $l -ne $i; $l++){
        $letters_first += $first[$l]
        }

        $sam_account = $letters_first+$last
        if(-not (Get-aduser -Filter {SamaccountName -eq $sam_account})) {
        $not_found = $false
        return $sam_account
        }
    }

    if($not_found -eq $true) {
    return "ERROR:FAIL"
    }
}



function generate() {
    $character = @("!","$","%","^","&","*","(",")","?")
    $letters_low=@("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z")
    $letters_cap=@("A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z")
    $numbers=@("1","2","3","4","5","6","7","8","9","0")
    $itterations = get-random -minimum 8 -maximum 10
    [string]$pass_value = ""

    for($i = 0; $i -ne $itterations+1;$i++) {
    $character_type = Get-random -minimum 1 -maximum 9

    switch ($character_type) {
        1 { $letter = Get-random -minimum 0 -maximum 26
        $pass_value = $pass_value+$character[$letter]
        }

        2 { $letter = Get-random -minimum 0 -maximum 26
        $pass_value = $pass_value+$letters_low[$letter] }

        3 { $letter = Get-random -minimum 0 -maximum 11
        $pass_value = $pass_value+$letters_low[$letter] }

        4 { $letter = Get-random -minimum 0 -maximum 11
        $pass_value = $pass_value+$letters_cap[$letter] }

        5 { $letter = Get-random -minimum 0 -maximum 11
        $pass_value = $pass_value+$character[$letter] }

        6 { $letter = Get-random -minimum 0 -maximum 11
        $pass_value = $pass_value+$numbers[$letter] }

        7 { $letter = Get-random -minimum 0 -maximum 11
        $pass_value = $pass_value+$letters_cap[$letter] }

        8 { $letter = Get-random -minimum 0 -maximum 11
        $pass_value = $pass_value+$letters_cap[$letter]}
    }

    $letter = Get-random -minimum 0 -maximum 26
    $pass_value = $pass_value+$character[$letter]

    $letter = Get-random -minimum 0 -maximum 11
    $pass_value = $pass_value+$letters_cap[$letter]

    $letter = Get-random -minimum 0 -maximum 11
    $pass_value = $pass_value+$numbers[$letter]
    }
return $pass_value
}




echo "Status,Date,SamAccountName,Password,FirstName,LastName,DisplayName,City,Phone" >> create_output.csv
$user_data_json_list = invoke-restmethod "https://www.randomuser.me/api/?results=$Number_of_users&nat=$nationalities" | select -expandproperty results
foreach($user_data_json in $user_data_json_list) {

$aduser_Given = $user_data_json.name.first
$aduser_Surname = $user_data_json.name.last
$aduser_password = generate
$aduser_display = $user_data_json.name.last + ", " + $user_data_json.name.first
$aduser_phone = $user_data_json.phone
$aduser_city = $user_data_json.location.city
$aduser_samaccountname = find_ad_id $aduser_Given $aduser_Surname

    if($aduser_samaccountname -eq "ERROR:FAIL") {
        echo "Failure $aduser_Surname sam account in use"
        echo "Error Samaccount,""$date"",""$aduser_samaccountname"",""$aduser_password"",""$aduser_Given"",""$aduser_Surname"",""$aduser_display"",""$aduser_city"",""$aduser_phone""" >> create_output.csv
    } else {
        New-ADUser -AccountPassword (ConvertTo-SecureString “$aduser_password” -AsPlainText -Force) -ChangePasswordAtLogon $false -City $aduser_city -company “$company_name” -DisplayName “$aduser_display” -Enabled $true -MobilePhone “$aduser_phone” -Name “$aduser_display” -SamAccountName $aduser_samaccountname -Path “$ou" -givenname $aduser_Given -surname $aduser_Surname -userprincipalname (“$aduser_samaccountname” + “$principlename”) -description “$description”
        clear
        Write-Host "`r Generating user: $aduser_Given $aduser_Surname" -NoNewLine
        echo "Success,""$date"",""$aduser_samaccountname"",""$aduser_password"",""$aduser_Given"",""$aduser_Surname"",""$aduser_display"",""$aduser_city"",""$aduser_phone""" >> create_output.csv
    }
}