IosNotificationRenderer.cs

using System.Collections.Generic;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Foundation;
using NeuroAccessMaui.Services.Notification;
using UserNotifications;
 
namespace NeuroAccessMaui.Services.Push
{
    public sealed class IosNotificationRenderer : INotificationRenderer
    {
        public async Task RenderAsync(NotificationIntent Intent, CancellationToken CancellationToken)
        {
            CancellationToken.ThrowIfCancellationRequested();
 
            if (Intent.Presentation is NotificationPresentation.StoreOnly or NotificationPresentation.Transient)
                return;
 
            UNMutableNotificationContent content = new()
            {
                Title = Intent.Title,
                Body = Intent.Body ?? string.Empty,
                Sound = UNNotificationSound.Default,
                UserInfo = this.BuildUserInfo(Intent)
            };
 
            UNNotificationRequest request = UNNotificationRequest.FromIdentifier(
                Guid.NewGuid().ToString(),
                content,
                trigger: null);
 
 
            await UNUserNotificationCenter.Current.AddNotificationRequestAsync(request);
        }
 
        private NSDictionary BuildUserInfo(NotificationIntent Intent)
        {
            NSMutableDictionary dictionary = new();
 
            if (!string.IsNullOrEmpty(Intent.Channel))
                dictionary.SetValueForKey(new NSString(Intent.Channel), new NSString("channelId"));
 
            dictionary.SetValueForKey(new NSString(Intent.Title), new NSString("myTitle"));
 
            if (!string.IsNullOrEmpty(Intent.Body))
                dictionary.SetValueForKey(new NSString(Intent.Body), new NSString("myBody"));
 
            dictionary.SetValueForKey(new NSString(Intent.Action.ToString()), new NSString("action"));
 
            if (!string.IsNullOrEmpty(Intent.EntityId))
                dictionary.SetValueForKey(new NSString(Intent.EntityId), new NSString("entityId"));
 
            if (!string.IsNullOrEmpty(Intent.CorrelationId))
                dictionary.SetValueForKey(new NSString(Intent.CorrelationId), new NSString("correlationId"));
 
            foreach (KeyValuePair<string, string> pair in Intent.Extras)
            {
                dictionary.SetValueForKey(new NSString(pair.Value), new NSString(pair.Key));
            }
 
            try
            {
                string json = JsonSerializer.Serialize(Intent);
                dictionary.SetValueForKey(new NSString(json), new NSString("notificationIntent"));
            }
            catch
            {
                // If serialization fails, continue without the aggregated payload.
            }
 
            return dictionary;
        }
    }
}