Add snooze support for calendar reminders (toast UI, service, DB) (#825)

* Filter reminder snooze options by default reminder

* Some updates.

* Fixing empty welcome page issue and attendee loading.

* Icon system for notifications and snooze options etc.

AGENTS.md

@@ -130,5 +130,6 @@ private string searchQuery = string.Empty;
 - Wrap async operations in try-catch
 - Log errors via IWinoLogger
 - In ViewModels, update all UI-bound properties/collections via `ExecuteUIThread(...)` (especially after awaited calls and any use of `ConfigureAwait(false)`).
+- In `EventDetailsPageViewModel.LoadAttendeesAsync`, never mutate `CurrentEvent.Attendees` outside `ExecuteUIThread(...)`.
 
 

Wino.Calendar.ViewModels/CalendarSettingsPageViewModel.cs

@@ -50,6 +50,12 @@ public partial class CalendarSettingsPageViewModel : CalendarBaseViewModel
     [ObservableProperty]
     public partial int SelectedDefaultReminderIndex { get; set; }
 
+    [ObservableProperty]
+    public partial List<string> SnoozeOptions { get; set; } = [];
+
+    [ObservableProperty]
+    public partial int SelectedDefaultSnoozeIndex { get; set; }
+
     public IPreferencesService PreferencesService { get; }
     private readonly ICalendarService _calendarService;
     private readonly IAccountService _accountService;
@@ -108,6 +114,15 @@ public partial class CalendarSettingsPageViewModel : CalendarBaseViewModel
             SelectedDefaultReminderIndex = index >= 0 ? index + 1 : 0;
         }
 
+        var supportedSnoozeMinutes = CalendarReminderSnoozeOptions.GetSupportedSnoozeMinutes().ToArray();
+        foreach (var snoozeMinutes in supportedSnoozeMinutes)
+        {
+            SnoozeOptions.Add(string.Format(Translator.CalendarReminder_SnoozeMinutesOption, snoozeMinutes));
+        }
+
+        var selectedSnoozeIndex = Array.IndexOf(supportedSnoozeMinutes, preferencesService.DefaultSnoozeDurationInMinutes);
+        SelectedDefaultSnoozeIndex = selectedSnoozeIndex >= 0 ? selectedSnoozeIndex : 0;
+
         _isLoaded = true;
 
         // Load accounts with calendar support
@@ -147,6 +162,7 @@ public partial class CalendarSettingsPageViewModel : CalendarBaseViewModel
     partial void OnWorkingDayStartIndexChanged(int value) => SaveSettings();
     partial void OnWorkingDayEndIndexChanged(int value) => SaveSettings();
     partial void OnSelectedDefaultReminderIndexChanged(int value) => SaveSettings();
+    partial void OnSelectedDefaultSnoozeIndexChanged(int value) => SaveSettings();
 
     public void SaveSettings()
     {
@@ -205,6 +221,13 @@ public partial class CalendarSettingsPageViewModel : CalendarBaseViewModel
             PreferencesService.DefaultReminderDurationInSeconds = minutes * 60;
         }
 
+        var supportedSnoozeMinutes = CalendarReminderSnoozeOptions.GetSupportedSnoozeMinutes();
+        if (supportedSnoozeMinutes.Count > 0)
+        {
+            var selectedIndex = Math.Clamp(SelectedDefaultSnoozeIndex, 0, supportedSnoozeMinutes.Count - 1);
+            PreferencesService.DefaultSnoozeDurationInMinutes = supportedSnoozeMinutes[selectedIndex];
+        }
+
         Messenger.Send(new CalendarSettingsUpdatedMessage());
     }
 }

Wino.Calendar.ViewModels/EventDetailsPageViewModel.cs

@@ -31,6 +31,7 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
     private readonly IWinoRequestDelegator _winoRequestDelegator;
     private readonly INavigationService _navigationService;
     private readonly IUnderlyingThemeService _underlyingThemeService;
+    private readonly INotificationBuilder _notificationBuilder;
     private readonly IContactService _contactService;
 
     public CalendarSettings CurrentSettings { get; }
@@ -144,6 +145,7 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
                                      IMailDialogService dialogService,
                                      IWinoRequestDelegator winoRequestDelegator,
                                      INavigationService navigationService,
+                                     INotificationBuilder notificationBuilder,
                                      IUnderlyingThemeService underlyingThemeService,
                                      IContactService contactService)
     {
@@ -154,6 +156,7 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         _winoRequestDelegator = winoRequestDelegator;
         _navigationService = navigationService;
         _underlyingThemeService = underlyingThemeService;
+        _notificationBuilder = notificationBuilder;
         _contactService = contactService;
 
         CurrentSettings = _preferencesService.GetCurrentCalendarSettings();
@@ -259,8 +262,6 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
 
     private async Task LoadAttendeesAsync(Guid calendarItemId, CalendarItem calendarItem)
     {
-        CurrentEvent.Attendees.Clear();
-
         var attendees = await _calendarService.GetAttendeesAsync(calendarItemId);
 
         // Resolve contacts for all attendees in a single batch DB query.
@@ -285,10 +286,12 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         var organizer = attendees.FirstOrDefault(a => a.IsOrganizer);
         var nonOrganizerAttendees = attendees.Where(a => !a.IsOrganizer).ToList();
 
+        var attendeesForUi = new List<CalendarEventAttendee>();
+
         // If the organizer is in the list, add them first
         if (organizer != null)
         {
-            CurrentEvent.Attendees.Add(organizer);
+            attendeesForUi.Add(organizer);
         }
         else if (!string.IsNullOrEmpty(calendarItem.OrganizerEmail))
         {
@@ -306,14 +309,27 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
             if (contactLookup.TryGetValue(calendarItem.OrganizerEmail, out var organizerContact))
                 organizerAttendee.ResolvedContact = organizerContact;
 
-            CurrentEvent.Attendees.Add(organizerAttendee);
+            attendeesForUi.Add(organizerAttendee);
         }
 
         // Add all other attendees after the organizer
         foreach (var item in nonOrganizerAttendees)
         {
-            CurrentEvent.Attendees.Add(item);
+            attendeesForUi.Add(item);
         }
+
+        await ExecuteUIThread(() =>
+        {
+            if (CurrentEvent == null)
+                return;
+
+            CurrentEvent.Attendees.Clear();
+
+            foreach (var attendee in attendeesForUi)
+            {
+                CurrentEvent.Attendees.Add(attendee);
+            }
+        });
     }
 
     private async Task LoadAttachmentsAsync(Guid calendarItemId)
@@ -491,6 +507,24 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         return _nativeAppService.LaunchUriAsync(new Uri(CurrentEvent.CalendarItem.HtmlLink));
     }
 
+    [RelayCommand]
+    private Task CreateTestNotificationAsync()
+    {
+        if (CurrentEvent?.CalendarItem == null)
+            return Task.CompletedTask;
+
+        var reminderDurationInSeconds = Reminders?
+            .Where(x => x.DurationInSeconds > 0)
+            .OrderByDescending(x => x.DurationInSeconds)
+            .Select(x => x.DurationInSeconds)
+            .FirstOrDefault() ?? 0;
+
+        if (reminderDurationInSeconds <= 0)
+            reminderDurationInSeconds = Math.Max(_preferencesService.DefaultReminderDurationInSeconds, 30 * 60);
+
+        return _notificationBuilder.CreateCalendarReminderNotificationAsync(CurrentEvent.CalendarItem, reminderDurationInSeconds);
+    }
+
     [RelayCommand]
     private void ToggleRsvpPanel()
     {

Wino.Core.Domain/CalendarReminderSnoozeOptions.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Wino.Core.Domain;
+
+public static class CalendarReminderSnoozeOptions
+{
+    private static readonly int[] SupportedSnoozeMinutes = [5, 10, 15, 30];
+
+    public static IReadOnlyList<int> GetSupportedSnoozeMinutes()
+        => SupportedSnoozeMinutes;
+
+    public static IReadOnlyList<int> GetAllowedSnoozeMinutes(long reminderDurationInSeconds, long defaultReminderDurationInSeconds)
+    {
+        var reminderMinutes = (int)Math.Max(0, reminderDurationInSeconds / 60);
+
+        if (reminderMinutes <= 0)
+            return [];
+
+        var maxSnoozeMinutes = reminderMinutes;
+        var defaultReminderMinutes = (int)Math.Max(0, defaultReminderDurationInSeconds / 60);
+
+        if (defaultReminderMinutes > 0)
+            maxSnoozeMinutes = Math.Min(maxSnoozeMinutes, defaultReminderMinutes);
+
+        return SupportedSnoozeMinutes.Where(minutes => minutes <= maxSnoozeMinutes).ToArray();
+    }
+}

Wino.Core.Domain/Constants.cs

@@ -16,6 +16,8 @@ public static class Constants
     public const string ToastCalendarItemIdKey = nameof(ToastCalendarItemIdKey);
     public const string ToastCalendarActionKey = nameof(ToastCalendarActionKey);
     public const string ToastCalendarNavigateAction = nameof(ToastCalendarNavigateAction);
+    public const string ToastCalendarSnoozeAction = nameof(ToastCalendarSnoozeAction);
+    public const string ToastCalendarSnoozeDurationInputId = nameof(ToastCalendarSnoozeDurationInputId);
     public const string ToastModeKey = nameof(ToastModeKey);
     public const string ToastModeMail = nameof(ToastModeMail);
     public const string ToastModeCalendar = nameof(ToastModeCalendar);

Wino.Core.Domain/Entities/Calendar/CalendarItem.cs

@@ -138,6 +138,7 @@ public class CalendarItem : ICalendarItem
     // TODO
     public string CustomEventColorHex { get; set; }
     public string HtmlLink { get; set; }
+    public DateTime? SnoozedUntil { get; set; }
     public CalendarItemStatus Status { get; set; }
     public CalendarItemVisibility Visibility { get; set; }
 

Wino.Core.Domain/Interfaces/ICalendarService.cs

@@ -42,6 +42,7 @@ public interface ICalendarService
     Task UpdateCalendarItemAsync(CalendarItem calendarItem, List<CalendarEventAttendee> attendees);
     Task<List<Reminder>> GetRemindersAsync(Guid calendarItemId);
     Task SaveRemindersAsync(Guid calendarItemId, List<Reminder> reminders);
+    Task SnoozeCalendarItemAsync(Guid calendarItemId, DateTime snoozedUntilLocal);
 
     /// <summary>
     /// Checks due reminder windows and returns reminder notifications that should trigger now.

Wino.Core.Domain/Interfaces/IPreferencesService.cs

@@ -222,6 +222,11 @@ public interface IPreferencesService : INotifyPropertyChanged
     /// </summary>
     long DefaultReminderDurationInSeconds { get; set; }
 
+    /// <summary>
+    /// Setting: Default snooze duration in minutes for calendar reminder notifications.
+    /// </summary>
+    int DefaultSnoozeDurationInMinutes { get; set; }
+
     CalendarSettings GetCurrentCalendarSettings();
 
     #endregion

Wino.Core.Domain/Translations/en_US/resources.json

@@ -133,6 +133,14 @@
     "CalendarEventDetails_People": "People",
     "CalendarEventDetails_ReadOnlyEvent": "Read-only event",
     "CalendarEventDetails_Reminder": "Reminder",
+    "CalendarReminder_StartedHoursAgo": "Started {0} hours ago",
+    "CalendarReminder_StartedMinutesAgo": "Started {0} minutes ago",
+    "CalendarReminder_StartedNow": "Started just now",
+    "CalendarReminder_StartingNow": "Starting now",
+    "CalendarReminder_StartsInHours": "Starts in {0} hours",
+    "CalendarReminder_StartsInMinutes": "Starts in {0} minutes",
+    "CalendarReminder_SnoozeAction": "Snooze",
+    "CalendarReminder_SnoozeMinutesOption": "{0} minutes",
     "CalendarEventDetails_ShowAs": "Show as",
     "CalendarShowAs_Free": "Free",
     "CalendarShowAs_Tentative": "Tentative",
@@ -646,6 +654,8 @@
     "SettingsAvailableThemes_Title": "Available Themes",
     "SettingsCalendarSettings_Description": "Change first day of week, hour cell height and more...",
     "SettingsCalendarSettings_Title": "Calendar Settings",
+    "CalendarSettings_DefaultSnoozeDuration_Header": "Default snooze duration",
+    "CalendarSettings_DefaultSnoozeDuration_Description": "Set a default snooze duration for calendar reminder notifications.",
     "SettingsComposer_Title": "Composer",
     "SettingsComposerFont_Title": "Default Composer Font",
     "SettingsComposerFontFamily_Description": "Change the default font family and font size for composing mails.",

Wino.Core.Tests/CalendarReminderSnoozeOptionsTests.cs

@@ -0,0 +1,48 @@
+using FluentAssertions;
+using Wino.Core.Domain;
+using Xunit;
+
+namespace Wino.Core.Tests;
+
+public class CalendarReminderSnoozeOptionsTests
+{
+    [Fact]
+    public void GetAllowedSnoozeMinutes_WhenDefaultIs15AndReminderIs15_Excludes30()
+    {
+        var options = CalendarReminderSnoozeOptions.GetAllowedSnoozeMinutes(
+            reminderDurationInSeconds: 15 * 60,
+            defaultReminderDurationInSeconds: 15 * 60);
+
+        options.Should().Equal(5, 10, 15);
+    }
+
+    [Fact]
+    public void GetAllowedSnoozeMinutes_WhenReminderIs5AndDefaultIs15_DoesNotPassEventStart()
+    {
+        var options = CalendarReminderSnoozeOptions.GetAllowedSnoozeMinutes(
+            reminderDurationInSeconds: 5 * 60,
+            defaultReminderDurationInSeconds: 15 * 60);
+
+        options.Should().Equal(5);
+    }
+
+    [Fact]
+    public void GetAllowedSnoozeMinutes_WhenDefaultReminderIsNone_UsesReminderDurationOnly()
+    {
+        var options = CalendarReminderSnoozeOptions.GetAllowedSnoozeMinutes(
+            reminderDurationInSeconds: 30 * 60,
+            defaultReminderDurationInSeconds: 0);
+
+        options.Should().Equal(5, 10, 15, 30);
+    }
+
+    [Fact]
+    public void GetAllowedSnoozeMinutes_WhenReminderIsUnderFiveMinutes_ReturnsNoOptions()
+    {
+        var options = CalendarReminderSnoozeOptions.GetAllowedSnoozeMinutes(
+            reminderDurationInSeconds: 60,
+            defaultReminderDurationInSeconds: 15 * 60);
+
+        options.Should().BeEmpty();
+    }
+}

Wino.Core.Tests/Services/CalendarReminderServiceTests.cs

@@ -68,8 +68,8 @@ public class CalendarReminderServiceTests : IAsyncLifetime
         due.Should().HaveCount(1);
         due[0].CalendarItem.Id.Should().Be(calendarItem.Id);
         due[0].ReminderDurationInSeconds.Should().Be(5 * 60);
-        due[0].ReminderKey.Should().Be($"{calendarItem.Id:N}:{5 * 60}");
-        sentReminderKeys.Should().Contain($"{calendarItem.Id:N}:{5 * 60}");
+        due[0].ReminderKey.Should().StartWith($"{calendarItem.Id:N}:{5 * 60}:");
+        sentReminderKeys.Should().ContainSingle(k => k.StartsWith($"{calendarItem.Id:N}:{5 * 60}:"));
     }
 
     [Fact]
@@ -108,7 +108,7 @@ public class CalendarReminderServiceTests : IAsyncLifetime
 
         firstRun.Should().HaveCount(1);
         secondRun.Should().BeEmpty();
-        sentReminderKeys.Should().Contain($"{calendarItem.Id:N}:{5 * 60}");
+        sentReminderKeys.Should().ContainSingle(k => k.StartsWith($"{calendarItem.Id:N}:{5 * 60}:"));
     }
 
     [Fact]
@@ -189,6 +189,35 @@ public class CalendarReminderServiceTests : IAsyncLifetime
         due.Should().BeEmpty();
     }
 
+
+    [Fact]
+    public async Task CheckAndNotifyAsync_WhenItemIsSnoozed_TriggersAtSnoozedTime()
+    {
+        var nowLocal = new DateTime(2026, 1, 1, 10, 0, 0);
+        var lastCheckLocal = nowLocal.AddSeconds(-30);
+
+        var calendarItem = await CreateCalendarItemWithReminderAsync(
+            startDate: nowLocal.AddMinutes(5),
+            reminderDurationInSeconds: 5 * 60,
+            reminderType: CalendarItemReminderType.Popup);
+
+        await _calendarService.SnoozeCalendarItemAsync(calendarItem.Id, nowLocal.AddMinutes(10));
+
+        HashSet<string> sentReminderKeys = [];
+
+        var dueAtOriginalTrigger = await _calendarService.CheckAndNotifyAsync(lastCheckLocal, nowLocal, sentReminderKeys);
+        dueAtOriginalTrigger.Should().BeEmpty();
+
+        var snoozeTriggerWindowStart = nowLocal.AddMinutes(10).AddSeconds(-30);
+        var snoozeTriggerWindowEnd = nowLocal.AddMinutes(10);
+
+        var dueAtSnoozeTime = await _calendarService.CheckAndNotifyAsync(snoozeTriggerWindowStart, snoozeTriggerWindowEnd, sentReminderKeys);
+
+        dueAtSnoozeTime.Should().HaveCount(1);
+        dueAtSnoozeTime[0].CalendarItem.Id.Should().Be(calendarItem.Id);
+        dueAtSnoozeTime[0].ReminderKey.Should().StartWith($"{calendarItem.Id:N}:{5 * 60}:");
+    }
+
     private async Task<CalendarItem> CreateCalendarItemWithReminderAsync(
         DateTime startDate,
         long reminderDurationInSeconds,

Wino.Mail.WinUI/App.xaml.cs

@@ -192,6 +192,8 @@ public partial class App : WinoApplication,
 
     private void AppNotificationInvoked(AppNotificationManager sender, AppNotificationActivatedEventArgs args)
     {
+        // AppNotification callbacks are not guaranteed to run on the UI thread.
+        // Marshal toast handling to the window dispatcher before touching window APIs.
         if (MainWindow?.DispatcherQueue?.TryEnqueue(() => _ = HandleToastActivationAsync(args)) == true)
             return;
 
@@ -224,12 +226,20 @@ public partial class App : WinoApplication,
 
         // Check calendar reminder toast activation first.
         if (toastArguments.TryGetValue(Constants.ToastCalendarActionKey, out string calendarAction) &&
-            calendarAction == Constants.ToastCalendarNavigateAction &&
             toastArguments.TryGetValue(Constants.ToastCalendarItemIdKey, out string calendarItemIdString) &&
             Guid.TryParse(calendarItemIdString, out Guid calendarItemId))
         {
-            await HandleCalendarToastNavigationAsync(calendarItemId);
-            return;
+            if (calendarAction == Constants.ToastCalendarNavigateAction)
+            {
+                await HandleCalendarToastNavigationAsync(calendarItemId);
+                return;
+            }
+
+            if (calendarAction == Constants.ToastCalendarSnoozeAction)
+            {
+                await HandleCalendarToastSnoozeAsync(toastArgs, calendarItemId);
+                return;
+            }
         }
 
         // Check if this is a navigation toast (user clicked the notification).
@@ -275,6 +285,33 @@ public partial class App : WinoApplication,
         navigationService.Navigate(WinoPage.EventDetailsPage, target);
     }
 
+    private async Task HandleCalendarToastSnoozeAsync(AppNotificationActivatedEventArgs toastArgs, Guid calendarItemId)
+    {
+        if (!TryGetSnoozeDurationMinutes(toastArgs, out var snoozeDurationMinutes))
+            return;
+
+        var calendarService = Services.GetRequiredService<ICalendarService>();
+        var snoozedUntilLocal = DateTime.Now.AddMinutes(snoozeDurationMinutes);
+
+        await calendarService.SnoozeCalendarItemAsync(calendarItemId, snoozedUntilLocal).ConfigureAwait(false);
+    }
+
+    private static bool TryGetSnoozeDurationMinutes(AppNotificationActivatedEventArgs toastArgs, out int snoozeDurationMinutes)
+    {
+        snoozeDurationMinutes = 0;
+
+        if (toastArgs.UserInput == null ||
+            !toastArgs.UserInput.TryGetValue(Constants.ToastCalendarSnoozeDurationInputId, out var selectedValue) ||
+            selectedValue == null)
+        {
+            return false;
+        }
+
+        var selectedText = selectedValue.ToString();
+
+        return int.TryParse(selectedText, out snoozeDurationMinutes) && snoozeDurationMinutes > 0;
+    }
+
     /// <summary>
     /// Handles toast notification click for navigation.
     /// Creates window if not running, sets up navigation parameter.

Wino.Mail.WinUI/MailAppShell.xaml.cs

@@ -38,6 +38,8 @@ public sealed partial class MailAppShell : MailAppShellAbstract,
     IRecipient<CreateNewMailWithMultipleAccountsRequested>,
     IRecipient<InfoBarMessageRequested>
 {
+    public Frame GetShellFrame() => InnerShellFrame;
+
     [GeneratedDependencyProperty]
     public partial UIElement? TopShellContent { get; set; }
 

Wino.Mail.WinUI/Services/NavigationService.cs

@@ -129,6 +129,19 @@ public class NavigationService : NavigationServiceBase, INavigationService
 
         if (frameType == NavigationReferenceFrame.ShellFrame) return shellWindow.GetMainFrame();
 
+        if (frameType == NavigationReferenceFrame.InnerShellFrame)
+        {
+            if (mainFrame.Content is MailAppShell mailAppShell)
+            {
+                return mailAppShell.GetShellFrame();
+            }
+
+            if (mainFrame.Content is CalendarAppShell calendarAppShell)
+            {
+                return calendarAppShell.GetShellFrame();
+            }
+        }
+
         var contentRoot = mainFrame.Content as UIElement;
         if (contentRoot == null) return mainFrame;
 

Wino.Mail.WinUI/Services/NotificationBuilder.cs

@@ -1,9 +1,11 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.Messaging;
 using Microsoft.Toolkit.Uwp.Notifications;
+using Microsoft.UI.Xaml;
 using Serilog;
 using Windows.Data.Xml.Dom;
 using Windows.UI.Notifications;
@@ -12,6 +14,7 @@ using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Extensions;
 using Wino.Core.Domain.Interfaces;
 using Wino.Messaging.UI;
 
@@ -20,21 +23,29 @@ namespace Wino.Mail.WinUI.Services;
 public class NotificationBuilder : INotificationBuilder
 {
     private const string MailApplicationId = "App";
+    private const string NotificationIconRootUri = "ms-appx:///Assets/NotificationIcons/";
+    private static readonly int[] SupportedIconScales = [100, 125, 150, 200, 400];
 
     private readonly IAccountService _accountService;
     private readonly IFolderService _folderService;
     private readonly IMailService _mailService;
     private readonly IThumbnailService _thumbnailService;
+    private readonly IPreferencesService _preferencesService;
+    private readonly IUnderlyingThemeService _underlyingThemeService;
 
     public NotificationBuilder(IAccountService accountService,
                                IFolderService folderService,
                                IMailService mailService,
-                               IThumbnailService thumbnailService)
+                               IThumbnailService thumbnailService,
+                               IPreferencesService preferencesService,
+                               IUnderlyingThemeService underlyingThemeService)
     {
         _accountService = accountService;
         _folderService = folderService;
         _mailService = mailService;
         _thumbnailService = thumbnailService;
+        _preferencesService = preferencesService;
+        _underlyingThemeService = underlyingThemeService;
 
         WeakReferenceMessenger.Default.Register<MailReadStatusChanged>(this, (r, msg) =>
         {
@@ -156,12 +167,12 @@ public class NotificationBuilder : INotificationBuilder
     private ToastButton GetDismissButton()
         => new ToastButton()
         .SetDismissActivation()
-        .SetImageUri(new Uri("ms-appx:///Assets/NotificationIcons/dismiss.png"));
+        .SetImageUri(GetNotificationIconUri("dismiss"));
 
-    private static ToastButton GetArchiveButton(Guid mailUniqueId)
+    private ToastButton GetArchiveButton(Guid mailUniqueId)
         => new ToastButton()
         .SetContent(Translator.MailOperation_Archive)
-        .SetImageUri(new Uri("ms-appx:///Assets/NotificationIcons/archive.png"))
+        .SetImageUri(GetNotificationIconUri("mail-archive"))
         .AddArgument(Constants.ToastMailUniqueIdKey, mailUniqueId.ToString())
         .AddArgument(Constants.ToastActionKey, MailOperation.Archive)
         .AddArgument(Constants.ToastModeKey, Constants.ToastModeMail)
@@ -170,16 +181,16 @@ public class NotificationBuilder : INotificationBuilder
     private ToastButton GetDeleteButton(Guid mailUniqueId)
         => new ToastButton()
         .SetContent(Translator.MailOperation_Delete)
-        .SetImageUri(new Uri("ms-appx:///Assets/NotificationIcons/delete.png"))
+        .SetImageUri(GetNotificationIconUri("mail-delete"))
         .AddArgument(Constants.ToastMailUniqueIdKey, mailUniqueId.ToString())
         .AddArgument(Constants.ToastActionKey, MailOperation.SoftDelete)
         .AddArgument(Constants.ToastModeKey, Constants.ToastModeMail)
         .SetBackgroundActivation();
 
-    private static ToastButton GetMarkAsReadButton(Guid mailUniqueId)
+    private ToastButton GetMarkAsReadButton(Guid mailUniqueId)
         => new ToastButton()
         .SetContent(Translator.MailOperation_MarkAsRead)
-        .SetImageUri(new System.Uri("ms-appx:///Assets/NotificationIcons/markread.png"))
+        .SetImageUri(GetNotificationIconUri("mail-markread"))
         .AddArgument(Constants.ToastMailUniqueIdKey, mailUniqueId.ToString())
         .AddArgument(Constants.ToastActionKey, MailOperation.MarkAsRead)
         .AddArgument(Constants.ToastModeKey, Constants.ToastModeMail)
@@ -290,11 +301,9 @@ public class NotificationBuilder : INotificationBuilder
         var builder = new ToastContentBuilder();
         builder.SetToastScenario(ToastScenario.Reminder);
 
-        var localStart = calendarItem.LocalStartDate;
-        var reminderMinutes = (int)Math.Max(0, reminderDurationInSeconds / 60);
-        var reminderContext = reminderMinutes > 0
-            ? $"Starts in {reminderMinutes} minute{(reminderMinutes == 1 ? string.Empty : "s")}"
-            : "Starting now";
+        var localStart = calendarItem.GetLocalStartDate();
+        var nowLocal = DateTime.Now;
+        var reminderContext = GetCalendarReminderContext(localStart, nowLocal);
 
         builder.AddText(calendarItem.Title);
         builder.AddText($"{reminderContext} - {localStart:g}");
@@ -305,7 +314,54 @@ public class NotificationBuilder : INotificationBuilder
         builder.AddArgument(Constants.ToastCalendarActionKey, Constants.ToastCalendarNavigateAction);
         builder.AddArgument(Constants.ToastCalendarItemIdKey, calendarItem.Id.ToString());
         builder.AddArgument(Constants.ToastModeKey, Constants.ToastModeCalendar);
-        builder.AddButton(GetDismissButton());
+
+        var allowedSnoozeMinutes = CalendarReminderSnoozeOptions.GetAllowedSnoozeMinutes(
+            reminderDurationInSeconds,
+            _preferencesService.DefaultReminderDurationInSeconds);
+
+        if (allowedSnoozeMinutes.Count > 0)
+        {
+            var preferredSnoozeMinutes = _preferencesService.DefaultSnoozeDurationInMinutes;
+            var defaultSnoozeMinutes = allowedSnoozeMinutes.Contains(preferredSnoozeMinutes)
+                ? preferredSnoozeMinutes
+                : allowedSnoozeMinutes[0];
+
+            var selectionBox = new ToastSelectionBox(Constants.ToastCalendarSnoozeDurationInputId)
+            {
+                DefaultSelectionBoxItemId = defaultSnoozeMinutes.ToString()
+            };
+
+            foreach (var snoozeMinutes in allowedSnoozeMinutes)
+            {
+                selectionBox.Items.Add(new ToastSelectionBoxItem(
+                    snoozeMinutes.ToString(),
+                    string.Format(Translator.CalendarReminder_SnoozeMinutesOption, snoozeMinutes)));
+            }
+
+            builder.AddToastInput(selectionBox);
+            var snoozeButton = new ToastButton()
+                .SetContent(Translator.CalendarReminder_SnoozeAction)
+                .SetImageUri(GetNotificationIconUri("calendar-snooze"))
+                .SetBackgroundActivation();
+
+            builder.AddButton(snoozeButton)
+                .AddArgument(Constants.ToastCalendarActionKey, Constants.ToastCalendarSnoozeAction)
+                .AddArgument(Constants.ToastCalendarItemIdKey, calendarItem.Id.ToString())
+                .AddArgument(Constants.ToastModeKey, Constants.ToastModeCalendar);
+        }
+
+        builder.AddButton(new ToastButton()
+            .SetDismissActivation()
+            .SetImageUri(GetNotificationIconUri("dismiss")));
+
+        if (Uri.TryCreate(calendarItem.HtmlLink, UriKind.Absolute, out var joinUri))
+        {
+            builder.AddButton(new ToastButton()
+                .SetContent(Translator.CalendarEventDetails_JoinOnline)
+                .SetImageUri(GetNotificationIconUri("calendar-join"))
+                .SetProtocolActivation(joinUri));
+        }
+
         builder.AddAudio(new ToastAudio()
         {
             Src = new Uri("ms-winsoundevent:Notification.Reminder")
@@ -317,6 +373,36 @@ public class NotificationBuilder : INotificationBuilder
         return Task.CompletedTask;
     }
 
+    private static string GetCalendarReminderContext(DateTime localStart, DateTime nowLocal)
+    {
+        var delta = localStart - nowLocal;
+        var absDelta = delta.Duration();
+
+        if (absDelta < TimeSpan.FromMinutes(1))
+            return delta.TotalSeconds >= 0 ? Translator.CalendarReminder_StartingNow : Translator.CalendarReminder_StartedNow;
+
+        if (delta.TotalSeconds > 0)
+        {
+            if (delta.TotalHours >= 1)
+            {
+                var hours = Math.Max(1, (int)Math.Floor(delta.TotalHours));
+                return string.Format(Translator.CalendarReminder_StartsInHours, hours);
+            }
+
+            var minutes = Math.Max(1, (int)Math.Floor(delta.TotalMinutes));
+            return string.Format(Translator.CalendarReminder_StartsInMinutes, minutes);
+        }
+
+        if (absDelta.TotalHours >= 1)
+        {
+            var hoursAgo = Math.Max(1, (int)Math.Floor(absDelta.TotalHours));
+            return string.Format(Translator.CalendarReminder_StartedHoursAgo, hoursAgo);
+        }
+
+        var minutesAgo = Math.Max(1, (int)Math.Floor(absDelta.TotalMinutes));
+        return string.Format(Translator.CalendarReminder_StartedMinutesAgo, minutesAgo);
+    }
+
     private static void ShowToast(ToastContentBuilder builder, string? tag = null)
     {
         var toastNotification = new ToastNotification(builder.GetToastContent().GetXml());
@@ -329,4 +415,25 @@ public class NotificationBuilder : INotificationBuilder
         var notifier = ToastNotificationManager.CreateToastNotifier();
         notifier.Show(toastNotification);
     }
+
+    private Uri GetNotificationIconUri(string iconName)
+    {
+        var theme = _underlyingThemeService.IsUnderlyingThemeDark() ? "dark" : "light";
+        var scale = GetClosestAvailableScale();
+        return new($"{NotificationIconRootUri}{iconName}.theme-{theme}.scale-{scale}.png");
+    }
+
+    private static int GetClosestAvailableScale()
+    {
+        var rasterScale = 1.0;
+
+        if (WinoApplication.MainWindow?.Content is FrameworkElement rootElement &&
+            rootElement.XamlRoot != null)
+        {
+            rasterScale = rootElement.XamlRoot.RasterizationScale;
+        }
+
+        var requestedScale = (int)Math.Round(rasterScale * 100);
+        return SupportedIconScales.OrderBy(s => Math.Abs(s - requestedScale)).First();
+    }
 }

Wino.Mail.WinUI/Services/PreferencesService.cs

@@ -284,6 +284,12 @@ public class PreferencesService(IConfigurationService configurationService) : Ob
         set => SaveProperty(propertyName: nameof(DefaultReminderDurationInSeconds), value);
     }
 
+    public int DefaultSnoozeDurationInMinutes
+    {
+        get => _configurationService.Get(nameof(DefaultSnoozeDurationInMinutes), 5);
+        set => SaveProperty(propertyName: nameof(DefaultSnoozeDurationInMinutes), value);
+    }
+
     public int EmailSyncIntervalMinutes
     {
         get => _configurationService.Get(nameof(EmailSyncIntervalMinutes), 3);

Wino.Mail.WinUI/Views/Calendar/CalendarSettingsPage.xaml

@@ -235,6 +235,17 @@
                     <ComboBox ItemsSource="{x:Bind ViewModel.ReminderOptions, Mode=OneWay}" SelectedIndex="{x:Bind ViewModel.SelectedDefaultReminderIndex, Mode=TwoWay}" />
                 </controls:SettingsCard.Content>
             </controls:SettingsCard>
+
+            <controls:SettingsCard
+                Description="{x:Bind domain:Translator.CalendarSettings_DefaultSnoozeDuration_Description}"
+                Header="{x:Bind domain:Translator.CalendarSettings_DefaultSnoozeDuration_Header}">
+                <controls:SettingsCard.HeaderIcon>
+                    <PathIcon Data="F1 M 10 1.25 C 10.456706 1.25 10.889486 1.337565 11.298339 1.512695 C 11.707192 1.687826 12.072591 1.927409 12.394531 2.231445 C 12.716471 2.535482 12.97656 2.892253 13.173828 3.301758 C 13.371096 3.711263 13.481771 4.146484 13.505859 4.607422 L 13.505859 5 C 13.969401 5.028646 14.386068 5.16276 14.755859 5.402344 C 15.125651 5.641927 15.414713 5.947917 15.623047 6.320312 C 15.83138 6.692709 15.9349 7.096355 15.933594 7.53125 L 15.933594 8.75 L 16.25 8.75 C 16.822917 8.75 17.317057 8.95638 17.732422 9.369141 C 18.147787 9.781901 18.357422 10.273437 18.359375 10.84375 L 18.359375 16.40625 C 18.359375 16.979167 18.153971 17.473308 17.743164 17.888672 C 17.332357 18.304037 16.839844 18.511719 16.265625 18.511719 L 3.734375 18.511719 C 3.164062 18.511719 2.671549 18.304037 2.256836 17.888672 C 1.842122 17.473308 1.634114 16.979167 1.630859 16.40625 L 1.630859 10.84375 C 1.630859 10.273437 1.837565 9.781901 2.250977 9.369141 C 2.664388 8.95638 3.156901 8.75 3.728516 8.75 L 4.0625 8.75 L 4.0625 7.53125 C 4.0625 7.09375 4.166341 6.689453 4.374023 6.314453 C 4.581706 5.939453 4.86914 5.632486 5.236328 5.393555 C 5.603516 5.154623 6.019532 5.021485 6.484375 4.994141 L 6.484375 4.607422 C 6.506511 4.148438 6.617838 3.714518 6.818359 3.305664 C 7.01888 2.896811 7.282877 2.539063 7.610352 2.232422 C 7.937826 1.92578 8.308268 1.685222 8.721679 1.510742 C 9.135091 1.336264 9.56575 1.249024 10.013672 1.249024 Z M 10.013672 2.5 C 9.441406 2.5 8.947916 2.706381 8.533203 3.119141 C 8.118489 3.531901 7.911459 4.023437 7.912109 4.59375 L 7.912109 6.25 L 12.089844 6.25 L 12.089844 4.59375 C 12.089844 4.023438 11.882161 3.531902 11.466797 3.119141 C 11.051433 2.706382 10.557292 2.5 9.984375 2.5 Z M 5.3125 7.53125 L 5.3125 8.75 L 14.6875 8.75 L 14.6875 7.53125 C 14.6875 7.303385 14.605144 7.107747 14.440429 6.944336 C 14.275714 6.780925 14.080729 6.69987 13.855469 6.703125 L 6.142578 6.703125 C 5.914713 6.703125 5.71875 6.785482 5.552734 6.950195 C 5.386719 7.114909 5.30339 7.310547 5.300781 7.537109 Z M 16.25 10 L 3.75 10 C 3.540365 10 3.361328 10.071615 3.212891 10.214844 C 3.064453 10.358073 2.989258 10.534505 2.986328 10.744141 L 2.986328 16.40625 C 2.986328 16.618489 3.058595 16.797526 3.203125 16.943359 C 3.347656 17.089193 3.526693 17.161458 3.740234 17.15625 L 16.25 17.15625 C 16.458333 17.15625 16.636067 17.082683 16.783203 16.935547 C 16.930339 16.788411 17.003906 16.609375 17.003906 16.398437 L 17.003906 10.742187 C 17.003906 10.536459 16.932942 10.359049 16.791016 10.209961 C 16.64909 10.060873 16.469401 9.986328 16.257812 9.986328 Z M 10 11.5625 C 10.227865 11.5625 10.423502 11.644856 10.586914 11.809571 C 10.750325 11.974285 10.83138 12.16862 10.830078 12.393555 L 10.830078 13.427734 L 11.855469 13.427734 C 12.080404 13.427734 12.273437 13.509115 12.434571 13.671875 C 12.595704 13.834636 12.675781 14.026693 12.675781 14.248047 C 12.675781 14.46224 12.596354 14.653321 12.4375 14.813477 C 12.278646 14.973633 12.089192 15.053711 11.869141 15.053711 L 10.830078 15.053711 L 10.830078 16.074219 C 10.830078 16.296224 10.748372 16.486981 10.584961 16.646484 C 10.42155 16.805989 10.229818 16.885742 10.005859 16.885742 C 9.781901 16.885742 9.590495 16.806315 9.431641 16.647461 C 9.272786 16.488607 9.193359 16.296875 9.193359 16.072266 L 9.193359 15.053711 L 8.15625 15.053711 C 7.931314 15.053711 7.738934 14.972331 7.579102 14.80957 C 7.419269 14.646809 7.339192 14.454753 7.338867 14.233399 C 7.338867 14.008464 7.419921 13.815755 7.582031 13.655274 C 7.744141 13.494793 7.935872 13.414551 8.157227 13.414551 L 9.193359 13.414551 L 9.193359 12.394531 C 9.193359 12.166667 9.275715 11.971029 9.440429 11.807618 C 9.605144 11.644206 9.799479 11.562825 10.023437 11.5625 Z" />
+                </controls:SettingsCard.HeaderIcon>
+                <controls:SettingsCard.Content>
+                    <ComboBox ItemsSource="{x:Bind ViewModel.SnoozeOptions, Mode=OneWay}" SelectedIndex="{x:Bind ViewModel.SelectedDefaultSnoozeIndex, Mode=TwoWay}" />
+                </controls:SettingsCard.Content>
+            </controls:SettingsCard>
         </StackPanel>
         <VisualStateManager.VisualStateGroups>
             <VisualStateGroup x:Name="ClockIdentifierStates">

Wino.Mail.WinUI/Views/Calendar/EventDetailsPage.xaml

@@ -207,6 +207,23 @@
                         </Button.Flyout>
                     </Button>
 
+                    <Border
+                        Width="1"
+                        Height="24"
+                        Margin="4,0"
+                        VerticalAlignment="Center"
+                        Background="{ThemeResource DividerStrokeColorDefaultBrush}" />
+
+                    <!--  Test Notification  -->
+                    <Button
+                        Command="{x:Bind ViewModel.CreateTestNotificationCommand}"
+                        Style="{StaticResource TransparentActionButtonStyle}">
+                        <StackPanel Orientation="Horizontal" Spacing="8">
+                            <coreControls:WinoFontIcon FontSize="16" Icon="Reminder" />
+                            <TextBlock VerticalAlignment="Center" Text="Test notification" />
+                        </StackPanel>
+                    </Button>
+
                     <!--  Edit Series  -->
                     <Border
                         Width="1"

Wino.Mail.WinUI/Wino.Mail.WinUI.csproj

@@ -98,6 +98,66 @@
   </ItemGroup>
   <ItemGroup>
     <None Remove="Assets\CalendarWide310x150Logo.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-dark.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-dark.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-dark.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-dark.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-dark.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-light.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-light.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-light.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-light.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\calendar-join.theme-light.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-dark.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-dark.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-dark.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-dark.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-dark.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-light.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-light.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-light.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-light.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\calendar-snooze.theme-light.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-dark.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-dark.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-dark.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-dark.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-dark.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-light.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-light.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-light.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-light.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\dismiss.theme-light.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-dark.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-dark.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-dark.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-dark.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-dark.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-light.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-light.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-light.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-light.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\mail-archive.theme-light.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-dark.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-dark.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-dark.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-dark.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-dark.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-light.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-light.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-light.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-light.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\mail-delete.theme-light.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-dark.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-dark.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-dark.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-dark.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-dark.scale-400.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-light.scale-100.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-light.scale-125.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-light.scale-150.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-light.scale-200.png" />
+    <None Remove="Assets\NotificationIcons\mail-markread.theme-light.scale-400.png" />
     <None Remove="BackgroundImages\Acrylic.jpg" />
     <None Remove="BackgroundImages\Clouds.jpg" />
     <None Remove="BackgroundImages\Forest.jpg" />

Wino.Services/CalendarService.cs

@@ -336,6 +336,12 @@ public class CalendarService : BaseDatabaseService, ICalendarService
         });
     }
 
+    public Task SnoozeCalendarItemAsync(Guid calendarItemId, DateTime snoozedUntilLocal)
+        => Connection.ExecuteAsync(
+            $"UPDATE {nameof(CalendarItem)} SET {nameof(CalendarItem.SnoozedUntil)} = ? WHERE {nameof(CalendarItem.Id)} = ?",
+            snoozedUntilLocal,
+            calendarItemId);
+
     public async Task<List<CalendarReminderNotificationRequest>> CheckAndNotifyAsync(DateTime lastCheckLocal, DateTime nowLocal, ISet<string> sentReminderKeys, CancellationToken cancellationToken = default)
     {
         if (sentReminderKeys == null)
@@ -347,7 +353,8 @@ public class CalendarService : BaseDatabaseService, ICalendarService
                 c.Id AS CalendarItemId,
                 c.StartDate,
                 c.StartTimeZone,
-                r.DurationInSeconds AS ReminderDurationInSeconds
+                r.DurationInSeconds AS ReminderDurationInSeconds,
+                c.SnoozedUntil
             FROM CalendarItem c
             INNER JOIN Reminder r ON r.CalendarItemId = c.Id
             INNER JOIN AccountCalendar ac ON ac.Id = c.CalendarId
@@ -367,11 +374,14 @@ public class CalendarService : BaseDatabaseService, ICalendarService
 
             var eventStartLocal = candidate.StartDate.ToLocalTimeFromTimeZone(candidate.StartTimeZone);
             var triggerTimeLocal = eventStartLocal.AddSeconds(-candidate.ReminderDurationInSeconds);
+            var effectiveTriggerTimeLocal = candidate.SnoozedUntil.HasValue
+                ? MaxDateTime(triggerTimeLocal, candidate.SnoozedUntil.Value)
+                : triggerTimeLocal;
 
-            if (triggerTimeLocal <= lastCheckLocal || triggerTimeLocal > nowLocal)
+            if (effectiveTriggerTimeLocal <= lastCheckLocal || effectiveTriggerTimeLocal > nowLocal)
                 continue;
 
-            var reminderKey = $"{candidate.CalendarItemId:N}:{candidate.ReminderDurationInSeconds}";
+            var reminderKey = $"{candidate.CalendarItemId:N}:{candidate.ReminderDurationInSeconds}:{effectiveTriggerTimeLocal.Ticks}";
             if (!sentReminderKeys.Add(reminderKey))
                 continue;
 
@@ -438,11 +448,15 @@ public class CalendarService : BaseDatabaseService, ICalendarService
 
     #endregion
 
+    private static DateTime MaxDateTime(DateTime first, DateTime second)
+        => first >= second ? first : second;
+
     private sealed class CalendarReminderCandidate
     {
         public Guid CalendarItemId { get; set; }
         public DateTime StartDate { get; set; }
         public string StartTimeZone { get; set; }
         public long ReminderDurationInSeconds { get; set; }
+        public DateTime? SnoozedUntil { get; set; }
     }
 }

Wino.Services/DatabaseService.cs

@@ -120,6 +120,15 @@ public class DatabaseService : IDatabaseService
                 .ConfigureAwait(false);
         }
 
+        var calendarItemColumns = await Connection.GetTableInfoAsync(nameof(CalendarItem)).ConfigureAwait(false);
+
+        if (!calendarItemColumns.Any(c => c.Name == nameof(CalendarItem.SnoozedUntil)))
+        {
+            await Connection
+                .ExecuteAsync($"ALTER TABLE {nameof(CalendarItem)} ADD COLUMN {nameof(CalendarItem.SnoozedUntil)} TEXT NULL")
+                .ConfigureAwait(false);
+        }
+
         var contactColumns = await Connection.GetTableInfoAsync(nameof(AccountContact)).ConfigureAwait(false);
 
         if (!contactColumns.Any(c => c.Name == nameof(AccountContact.ContactPictureFileId)))