Calendar attachments.

Wino.Core.Domain/Interfaces/ICalendarService.cs

@@ -54,4 +54,28 @@ public interface ICalendarService
     /// Gets predefined reminder options in minutes (1 Hour, 30 Min, 15 Min, 5 Min, 1 Min).
     /// </summary>
     int[] GetPredefinedReminderMinutes();
+
+    #region Attachments
+
+    /// <summary>
+    /// Gets all attachments for a calendar event.
+    /// </summary>
+    Task<List<CalendarAttachment>> GetAttachmentsAsync(Guid calendarItemId);
+
+    /// <summary>
+    /// Inserts or updates calendar attachments.
+    /// </summary>
+    Task InsertOrReplaceAttachmentsAsync(List<CalendarAttachment> attachments);
+
+    /// <summary>
+    /// Marks an attachment as downloaded and updates its local file path.
+    /// </summary>
+    Task MarkAttachmentDownloadedAsync(Guid attachmentId, string localFilePath);
+
+    /// <summary>
+    /// Deletes all attachments for a calendar item.
+    /// </summary>
+    Task DeleteAttachmentsAsync(Guid calendarItemId);
+
+    #endregion
 }

Wino.Core.Domain/Interfaces/INativeAppService.cs

@@ -22,4 +22,9 @@ public interface INativeAppService
     /// This is used to display WAM broker dialog on running UWP app called by a windowless server code.
     /// </summary>
     Func<IntPtr> GetCoreWindowHwnd { get; set; }
+
+    /// <summary>
+    /// Gets the folder path where calendar attachments are stored.
+    /// </summary>
+    string GetCalendarAttachmentsFolderPath();
 }

Wino.Core.Domain/Interfaces/IWinoSynchronizerBase.cs

@@ -2,6 +2,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using MailKit;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Models.Folders;
 using Wino.Core.Domain.Models.Synchronization;
@@ -46,4 +47,5 @@ public interface IWinoSynchronizerBase : IBaseSynchronizer
     /// <param name="cancellationToken">Cancellation token.</param>
     /// <returns>Search results after downloading missing mail copies from server.</returns>
     Task<List<MailCopy>> OnlineSearchAsync(string queryText, List<IMailItemFolder> folders, CancellationToken cancellationToken = default);
+    Task DownloadCalendarAttachmentAsync(CalendarItem calendarItem, CalendarAttachment attachment, string localFilePath, CancellationToken cancellationToken);
 }