manager-service/ManagerService/Services/NotificationService.cs

using FirebaseAdmin;
using FirebaseAdmin.Messaging;
using Google.Apis.Auth.OAuth2;
using Hangfire;
using Manager.Services;
using ManagerService.Data;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
using System.Linq;
using System.Threading.Tasks;

namespace ManagerService.Services
{
    public class NotificationService
    {
        private readonly ILogger<NotificationService> _logger;
        private readonly IServiceScopeFactory _scopeFactory;

        public NotificationService(ILogger<NotificationService> logger, IServiceScopeFactory scopeFactory)
        {
            _logger = logger;
            _scopeFactory = scopeFactory;
        }

        public async Task SendToTopicAsync(string notificationId)
        {
            using var scope = _scopeFactory.CreateScope();
            var db = scope.ServiceProvider.GetRequiredService<MyInfoMateDbContext>();
            IHexIdGeneratorService idService = new HexIdGeneratorService();

            var notification = await db.PushNotifications.FirstOrDefaultAsync(n => n.Id == notificationId);
            if (notification == null)
            {
                _logger.LogWarning("Notification {Id} not found", notificationId);
                return;
            }

            try
            {
                var message = new Message
                {
                    Topic = notification.Topic,
                    Notification = new Notification
                    {
                        Title = notification.Title,
                        Body = notification.Body
                    }
                };

                await FirebaseMessaging.DefaultInstance.SendAsync(message);

                notification.Status = PushNotificationStatus.Sent;
                notification.SentAt = DateTime.UtcNow;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Failed to send notification {Id}", notificationId);
                notification.Status = PushNotificationStatus.Failed;
            }

            await db.SaveChangesAsync();
        }
    }
}