using System;
using System.Linq;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Models.ContentEditing;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Extensions;

namespace Umbraco.Docs.Samples.Web.Notifications;

public class EditorSendingContentNotificationHandler : INotificationHandler<SendingContentNotification>
{
    public void Handle(SendingContentNotification notification)
    {
        if (notification.Content.ContentTypeAlias.Equals("blogpost"))
        {
            // Access the property you want to pre-populate
            // each content item can have 'variations' - each variation is represented by the `ContentVariantDisplay` class.
            // if your site uses variants, then you need to decide whether to set the default value for all variants or a specific variant
            // eg. set by variant name:
            // var variant = notification.Content.Variants.FirstOrDefault(f => f.Name == "specificVariantName");
            // OR loop through all the variants:
            foreach (var variant in notification.Content.Variants)
            {
                // Check if variant is a 'new variant'
                // we only want to set the default value when the content item is first created
                if (variant.State == ContentSavedState.NotCreated)
                {
                    // each variant has an IEnumerable of 'Tabs' (property groupings)
                    // and each of these contain an IEnumerable of `ContentPropertyDisplay` properties
                    // find the first property with alias 'publishDate'
                    var pubDateProperty = variant.Tabs.SelectMany(f => f.Properties)
                        .FirstOrDefault(f => f.Alias.InvariantEquals("publishDate"));
                    if (pubDateProperty is not null)
                    {
                        // set default value of the publish date property if it exists
                        pubDateProperty.Value = DateTime.UtcNow;
                    }
                }
            }
        }
    }
}

using System.Collections.Generic;
using System.Linq;
using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Services;

namespace Umbraco.Docs.Samples.Web.Notifications;

public class EditorSendingMemberNotificationHandler : INotificationHandler<SendingMemberNotification>
{
    private readonly IMemberGroupService _memberGroupService;

    public EditorSendingMemberNotificationHandler(IMemberGroupService memberGroupService)
    {
        _memberGroupService = memberGroupService;
    }

    public void Handle(SendingMemberNotification notification)
    {
        var isNew = !int.TryParse(notification.Member.Id?.ToString(), out int id) || id == 0;

        // We only want to set the default member group when the member is initially created, eg doesn't have an Id yet
        if (isNew is false)
        {
            return;
        }

        // Set a default value member group for the member type `Member`
        if (notification.Member.ContentTypeAlias.Equals("Member"))
        {
            var memberGroup = _memberGroupService.GetByName("Customer");
            if (memberGroup is null)
            {
                return;
            }

            // Find member group property on member model
            var property = notification.Member.MembershipProperties.FirstOrDefault(x =>
                x.Alias.Equals($"{Constants.PropertyEditors.InternalGenericPropertiesPrefix}membergroup"));

            if (property is not null)
            {
                // Assign a default value for member group property
                property.Value = new Dictionary<string, object>
                {
                    {memberGroup.Name, true}
                };
            }
        }
    }
}