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# Search settings
$propertyForList = "distinguishedName" # TODO: modify me
$propertyForSearch = "description" # TODO: modify me
$valuesForSearch = @("Value1", "Value2") # TODO: modify me

# Property Pattern settings
$patternName = "User Pattern" # TODO: modify me
$propertyToUpdate = "manager" # TODO: modify me
$isPropertyRequired = $True # TODO: modify me

function SearchObjects($criteria, $properties, $baseObjectPath, $virtualRoot)
{
    $searcher = $Context.BindToObject($baseObjectPath)
    $searcher.Criteria = $criteria
    $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 Property Pattern
$propertyPatternsPath = $Context.GetWellKnownContainerPath("PropertyPatterns")

$criteriaPattern = New-AdmCriteria "adm-PropertyPattern" {Name -eq $patternName}
$searchResults = SearchObjects $criteriaPattern @() $propertyPatternsPath $False
if ($searchResults.Length -eq 0)
{
    $Context.LogMessage("Property Pattern '$patternName' not found.", "Warning")
    return
}
elseif ($searchResults.Length -gt 1)
{
    $Context.LogMessage("Found more than one Property Pattern with the following name: '$patternName'.", "Warning")
    return
}
$propertyPatternPath = $searchResults[0].AdsPath

# Build criteria for users
$criteria = New-AdmCriteria "user"
$simpleItem = $criteria.CreateSimple()
$simpleItem.SetProperty($propertyForList).
    SetComparisonOperator("empty").
    AddValue($False)
$criteria["user"].Add($simpleItem)
$propertyValueCriteria = $criteria.CreateCompound()
$propertyValueCriteria.SetLogicalOperator("OR")
foreach ($value in $valuesForSearch)
{
    $simpleItem = $criteria.CreateSimple()
    $simpleItem.SetProperty($propertyForSearch).
        SetComparisonOperator("eq").
        AddValue($value)
    $propertyValueCriteria.Add($simpleItem)

}
$criteria["user"].Add($propertyValueCriteria)

# Search users
$searchResults = SearchObjects $criteria @($propertyForList) "Adaxes://RootDSE" $True

$values = New-Object "System.Collections.ArrayList"
foreach ($searchResult in $searchResults)
{
    [void]$values.Add($searchResult.Properties[$propertyForList].Value)
}

# Update Property Pattern
$pattern = $Context.BindToObject($propertyPatternPath)

foreach ($item in $pattern.Items)
{
    if ($item.PropertyName -ieq $propertyToUpdate)
    {
        $pattern.Items.Remove($item)
        break
    }
}

if ($values.Count -eq 0)
{
    return
}

# Create a new item
$item = $pattern.Items.Create()
$item.PropertyName = $propertyToUpdate
$item.IsPropertyRequired = $isPropertyRequired

$constraints = $item.GetConstraints()
$constraint = $constraints.Create("ADM_PROPERTYCONSTRAINTTYPE_VALUERANGE")
$constraint.AreValuesDenied = $False
$constraint.Values = $values.ToArray()
$constraints.Add($constraint)
$item.SetConstraints($constraints)

# Save the changes
$item.SetInfo()
$pattern.Items.Add($item)