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$commandName = "My Command" # TODO: modify me
$parameterName = "param-MyParam" # TOOD: modify me
$propertyName = "departmentNumber" # TOOD: modify me

function SearchObjects($filter, $properties, $baseObjectPath, $virtualRoot)
{
    $searcher = $Context.BindToObject($baseObjectPath)
    $searcher.SearchFilter = $filter
    $searcher.SearchScope = "ADS_SCOPE_SUBTREE"
    $searcher.PageSize = 500
    $searcher.ReferralChasing = "ADS_CHASE_REFERRALS_NEVER"
    $searcher.SetPropertiesToLoad($properties)
    $searcher.VirtualRoot = $virtualRoot
    
    try
    {
        $searchResultIterator = $searcher.ExecuteSearch()
        $searchResults = $searchResultIterator.FetchAll()
        
        return ,$searchResults
    }
    finally
    {
        # Release resources
        if ($searchResultIterator){ $searchResultIterator.Dispose() }
    }
}

# Search Custom Command
$customCommandsPath = $Context.GetWellKnownContainerPath("CustomCommands")

$searchResults = SearchObjects "(&(objectClass=adm-CustomCommand)(name=$commandName))" @() $customCommandsPath $False
if ($searchResults.Length -eq 0)
{
    $Context.LogMessage("Custom Command with name '$commandName' not found.", "Warning")
    return
}
elseif ($searchResults.Length -gt 1)
{
    $Context.LogMessage("Found more than one Custom Command with the following name: '$commandName'.", "Warning")
    return
}
$customCommandPath = $searchResults[0].AdsPath

# Get parameter
$command = $Context.BindToObject($customCommandPath)
$parameters = $command.Parameters
$parameter = $parameters | Where {$_.Name -eq $parameterName}
if ($NULL -eq $parameter)
{
    $Context.LogMessage("Parameter '$parameterName' not found in Custom Command '$commandName'.", "Warning")
    return
}

# Search users
$searchResults = SearchObjects "(&(sAMAccountType=805306368)($propertyName=*))" @($propertyName) "Adaxes://RootDSE" $True

if ($searchResults.Length -eq 0)
{
    $Context.LogMessage("No values found for the parameter '$parameterName'.", "Warning")
    return
}

$parameterValues = @{}
foreach ($searchResult in $searchResults)
{
    $value = $searchResult.Properties[$propertyName].Value
    if ($parameterValues.ContainsKey($value))
    {
        continue
    }
    
    $parameterValue = $parameter.CreateValue()
    $parameterValue.Value = $value
    $parameterValues.Add($value, $parameterValue)
}

# Update Custom Command
$parameter.Values = $parameterValues.Values
$command.Parameters = $parameters
$command.SetInfo()