Notification Types

using System;
using System.Collections.Generic;
using System.Linq;
using Telligent.Evolution.Extensibility;
using Telligent.Evolution.Extensibility.Api.Entities.Version1;
using Telligent.Evolution.Extensibility.Api.Version1;
using Telligent.Evolution.Extensibility.Content.Version1;
using Telligent.Evolution.Extensibility.Email.Version1;

namespace Samples
{
	public class SampleNotificationType : INotificationType
	{
		private INotificationController _notificationController;

		#region IPlugin

		public string Name => "Sample Notification";

		public string Description => "This plugin demonstrates the INotificationType plugin type";

		public void Initialize()
		{
			Apis.Get<IComments>().Events.AfterCreate += CommentEvents_AfterCreate;
		}

		#endregion

		#region INotificationType

		public string NotificationTypeName => "Sample";

		public string NotificationTypeDescription => "Sends a sample notification.";

		public string NotificationTypeCategory => "Samples";

		public Guid NotificationTypeId => new Guid("3C0542FD-5AB0-4386-911C-86CCF530BAEE");

		public bool IsCacheable => true;

		public bool VaryCacheByUser => true;

		public bool CanDeleteNotification(Guid notificationId, int userId)
		{
			var notification = Apis.Get<INotifications>().Get(notificationId);
			return notification != null && notification.UserId == userId;
		}

		public string GetMessage(Guid notificationId, string target)
		{
			var notification = Apis.Get<INotifications>().Get(notificationId);
			if (notification == null || notification.ExtendedAttributes == null)
				return null;

			var commentIdAttribute = notification.ExtendedAttributes.FirstOrDefault(ea => ea.Key == "TargetCommentId");
			if (commentIdAttribute == null)
				return null;

			var commentId = Guid.Parse(commentIdAttribute.Value);
			var comment = Apis.Get<IComments>().Get(commentId);
			if (comment == null)
				return null;

			var user = Apis.Get<IUsers>().Get(new UsersGetOptions { Id = notification.UserId });
			if (user == null)
				return null;

			return $"The following comment was added by {user.DisplayName}: \"{comment.Body()}\"";
		}

		public string GetTargetUrl(Guid notificationId)
		{
			var notification = Apis.Get<INotifications>().Get(notificationId);
			return notification != null && notification.Content != null ? notification.Content.Url : null;
		}

		public void SetController(INotificationController controller)
		{
			_notificationController = controller;
		}

		#endregion

		private void CommentEvents_AfterCreate(CommentAfterCreateEventArgs e)
		{
			if (e == null
				|| e.Content == null
				|| e.User == null
				|| !e.IsApproved
				|| !e.Content.CreatedByUserId.HasValue
				|| e.CommentTypeId.GetValueOrDefault(Guid.Empty) != Guid.Empty)
			{
				return;
			}

			var comment = Apis.Get<IComments>().Get(e.CommentId);
			if (comment != null && comment.IsApproved)
			{
				AddNotifications(e.Content.ContentId, e.Content.ContentTypeId, e.CommentId, e.Content.CreatedByUserId.Value, e.UserId);
			}
		}

		private void AddNotifications(Guid contentId, Guid contentTypeId, Guid commentId, int contentAuthor, int actorId)
		{
			var comment = Apis.Get<IComments>().Get(commentId);
			if (comment == null)
				return;

			var attributes = new List<IExtendedAttribute>
			{
				new ExtendedAttribute { Key = "TargetCommentId", Value = comment.CommentId.ToString("N") }
			};

			_notificationController.CreateUpdate(new NotificationCreateUpdateOptions
			{
				ContentId = contentId,
				ContentTypeId = contentTypeId,
				LastUpdate = DateTime.UtcNow,
				UserId = contentAuthor,
				ActorIdToAdd = actorId,
				ExtendedAttributes = attributes
			});
		}
	}
}