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4433399 ccc2569 4433399 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | using LibraryManagement.Shared.Models;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using DbConnect.Data;
using Microsoft.EntityFrameworkCore;
namespace Backend.Features.Notification;
public class NotificationBackgroundService : BackgroundService
{
private readonly IServiceProvider _serviceProvider;
private readonly TimeSpan _checkInterval = TimeSpan.FromHours(24); // Check once a day
public NotificationBackgroundService(IServiceProvider serviceProvider)
{
_serviceProvider = serviceProvider;
}
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
while (!stoppingToken.IsCancellationRequested)
{
try
{
using (var scope = _serviceProvider.CreateScope())
{
var context = scope.ServiceProvider.GetRequiredService<AppDbContext>();
var notificationService = scope.ServiceProvider.GetRequiredService<INotificationService>();
await CheckSubscriptionExpiries(context, notificationService);
await CheckBorrowingReminders(context, notificationService);
}
}
catch (Exception ex)
{
Console.WriteLine($"Error in NotificationBackgroundService: {ex.Message}");
}
await Task.Delay(_checkInterval, stoppingToken);
}
}
private async Task CheckSubscriptionExpiries(AppDbContext context, INotificationService notificationService)
{
var targetDate = DateTime.Today.AddDays(25);
var expiringSubscriptions = await context.UserSubscriptions
.Include(s => s.User)
.Where(s => s.IsActive && s.ExpiryDate.Date <= targetDate)
.ToListAsync();
foreach (var sub in expiringSubscriptions)
{
// Check if notification already sent TODAY to avoid duplicates on restart
var alreadySentToday = await context.Notifications.AnyAsync(n =>
n.UserId == sub.UserId &&
n.Title == "Subscription Renewal Reminder" &&
n.CreatedAt >= DateTime.Today);
if (alreadySentToday) continue;
string title = "Subscription Renewal Reminder";
string message = $"Hello {sub.User.FullName}, your library subscription will expire soon ({sub.ExpiryDate:MMM dd, yyyy}). Renew now to avoid interruption!";
await notificationService.SendAndSaveNotificationAsync(
sub.UserId,
sub.User.FcmToken,
title,
message,
"Warning",
"/Membership",
"Renew Now");
}
}
private async Task CheckBorrowingReminders(AppDbContext context, INotificationService notificationService)
{
var targetDate = DateTime.Today.AddDays(10);
var dueBorrowings = await context.Borrowings
.Include(b => b.User)
.Include(b => b.Book)
.Where(b => b.Status == "Borrowed" && b.DueDate.Date <= targetDate)
.ToListAsync();
foreach (var loan in dueBorrowings)
{
// Check if notification already sent for this specific book TODAY
var alreadySentToday = await context.Notifications.AnyAsync(n =>
n.UserId == loan.UserId &&
n.Title == "Book Return Reminder" &&
n.Message.Contains(loan.Book.Title) &&
n.CreatedAt >= DateTime.Today);
if (alreadySentToday) continue;
string title = "Book Return Reminder";
string message = $"Hello {loan.User.FullName}, the book '{loan.Book.Title}' is due soon ({loan.DueDate:MMM dd, yyyy}). Please remember to return it on time!";
await notificationService.SendAndSaveNotificationAsync(
loan.UserId,
loan.User.FcmToken,
title,
message,
"Info",
"/Borrowings",
"View My Loans");
}
}
}
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