[CmdletBinding()]
param(
    [Parameter(Mandatory = $true)]
    [string]$SiteUrl,

    [Parameter(Mandatory = $true)]
    [string]$ListTitle,

    [Parameter(Mandatory = $true)]
    [string]$ExpiryFieldInternalName,

    [Guid]$FieldCustomizerComponentId = 'a555f4fc-d6a6-4421-8189-457449d9bbde',

    [Guid]$CommandSetComponentId = 'cd58f5d9-ffc8-4df7-a910-3054842d7abf'
)

$isapiPath = Join-Path ([Environment]::GetFolderPath('CommonProgramFiles')) 'microsoft shared\Web Server Extensions\16\ISAPI'
Add-Type -Path (Join-Path $isapiPath 'Microsoft.SharePoint.Client.Runtime.dll')
Add-Type -Path (Join-Path $isapiPath 'Microsoft.SharePoint.Client.dll')

$context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
$context.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials

try {
    $list = $context.Web.Lists.GetByTitle($ListTitle)
    $field = $list.Fields.GetByInternalNameOrTitle($ExpiryFieldInternalName)
    $customActions = $list.UserCustomActions
    $context.Load($list)
    $context.Load($field)
    $context.Load($customActions)
    $context.ExecuteQuery()

    if ($field.InternalName -ne $ExpiryFieldInternalName) {
        Write-Warning "Das Feld wurde über seinen Anzeigenamen gefunden. Verwende künftig den internen Namen '$($field.InternalName)'."
    }

    $field.ClientSideComponentId = $FieldCustomizerComponentId
    $field.ClientSideComponentProperties = '{}'
    $field.Update()

    $commandAction = $customActions | Where-Object {
        $_.Name -eq 'ExpiryIndicator.CommandSet' -or
        $_.ClientSideComponentId -eq $CommandSetComponentId
    } | Select-Object -First 1

    if ($null -eq $commandAction) {
        $commandAction = $customActions.Add()
    }

    $commandAction.Name = 'ExpiryIndicator.CommandSet'
    $commandAction.Title = 'ExpiryIndicator commands'
    # SPUserCustomAction uses the classic location value; SharePoint maps it to
    # the SPFx command bar and item context menu when ClientSideComponentId is set.
    $commandAction.Location = 'CommandUI.Ribbon'
    $commandAction.ClientSideComponentId = $CommandSetComponentId
    $commandAction.ClientSideComponentProperties = '{}'
    $commandAction.Update()

    $context.ExecuteQuery()

    Write-Host "Field Customizer wurde an '$($field.InternalName)' gebunden."
    Write-Host "Command Set wurde an '$($list.Title)' registriert."
    Write-Host 'Bitte die moderne Listenansicht mit Strg+F5 neu laden.'
}
finally {
    $context.Dispose()
}