marco.pms.api/Marco.Pms.Services/Service/FirebaseService.cs

using FirebaseAdmin.Messaging;
using Marco.Pms.DataAccess.Data;
using Marco.Pms.Services.Service.ServiceInterfaces;
using MarcoBMS.Services.Service;
using Microsoft.EntityFrameworkCore;

namespace Marco.Pms.Services.Service
{
    public class FirebaseService : IFirebaseService
    {
        private readonly IDbContextFactory<ApplicationDbContext> _dbContextFactory;
        private readonly ILoggingService _logger;
        public FirebaseService(IDbContextFactory<ApplicationDbContext> dbContextFactory,
            ILoggingService logger)
        {
            _dbContextFactory = dbContextFactory ?? throw new ArgumentNullException(nameof(dbContextFactory));
            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        public async Task SendDemoMessages(Notification notificationFirebase)
        {
            string deviceToken = "";
            var message = new Message()
            {
                Token = deviceToken,
                Notification = notificationFirebase
            };
            string response = await FirebaseMessaging.DefaultInstance.SendAsync(message);
        }

        public async Task SendMessageToMultipleDevicesAsync()
        {
            await using var _context = await _dbContextFactory.CreateDbContextAsync();

            // List of device registration tokens to send the message to
            var registrationTokens = await _context.FCMTokenMappings.Select(ft => ft.FcmToken).ToListAsync();
            //var registrationTokens = new List<string>
            //{
            //    "YOUR_REGISTRATION_TOKEN_1",
            //    "YOUR_REGISTRATION_TOKEN_2",
            //    // add up to 500 tokens
            //};

            var message = new MulticastMessage()
            {
                Tokens = registrationTokens,
                Notification = new Notification
                {
                    Title = "Testing from API",
                    Body = "This messages comes from FireBase Services"
                }
            };
            try
            {
                // Send the multicast message
                var response = await FirebaseMessaging.DefaultInstance.SendEachForMulticastAsync(message);
                _logger.LogInfo("{SuccessCount} messages were sent successfully.", response.SuccessCount);

                if (response.FailureCount > 0)
                {
                    var failedTokens = new List<string>();
                    for (int i = 0; i < response.Responses.Count; i++)
                    {
                        if (!response.Responses[i].IsSuccess)
                        {
                            failedTokens.Add(registrationTokens[i]);
                        }
                    }
                    _logger.LogInfo("List of tokens that caused failures: " + string.Join(", ", failedTokens));
                }
            }
            catch (FirebaseMessagingException ex)
            {
                // Log the specific Firebase error.
                _logger.LogError(ex, "Error sending push notification");

                // Check for specific error codes that indicate an invalid or unregistered token.
                if (ex.MessagingErrorCode == MessagingErrorCode.Unregistered ||
                    ex.MessagingErrorCode == MessagingErrorCode.InvalidArgument)
                {
                    _logger.LogWarning("FCM token is invalid and should be deleted from the database");

                    // TODO: Implement the logic here to remove the invalid token from your database.
                    // Example: await YourTokenService.DeleteTokenAsync(loginDto.DeviceToken);
                }
            }

        }
    }
}