Calendar attachments.

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

@@ -0,0 +1,55 @@
+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar;
+
+/// <summary>
+/// Represents metadata for calendar event attachments.
+/// Actual file content is downloaded on-demand.
+/// </summary>
+public class CalendarAttachment
+{
+    [PrimaryKey]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// The calendar item this attachment belongs to.
+    /// </summary>
+    public Guid CalendarItemId { get; set; }
+
+    /// <summary>
+    /// Remote identifier for the attachment from the provider (Outlook, Gmail, etc.).
+    /// </summary>
+    public string RemoteAttachmentId { get; set; }
+
+    /// <summary>
+    /// File name of the attachment.
+    /// </summary>
+    public string FileName { get; set; }
+
+    /// <summary>
+    /// Size of the attachment in bytes.
+    /// </summary>
+    public long Size { get; set; }
+
+    /// <summary>
+    /// MIME content type (e.g., "application/pdf", "image/png").
+    /// </summary>
+    public string ContentType { get; set; }
+
+    /// <summary>
+    /// Whether the attachment has been downloaded to local storage.
+    /// </summary>
+    public bool IsDownloaded { get; set; }
+
+    /// <summary>
+    /// Local file path where the attachment is stored (if downloaded).
+    /// </summary>
+    public string LocalFilePath { get; set; }
+
+    /// <summary>
+    /// When the attachment was last modified.
+    /// </summary>
+    public DateTimeOffset LastModified { get; set; }
+}

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);
 }

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

@@ -112,6 +112,13 @@
     "CalendarEventDetails_ReadOnlyEvent": "Read-only event",
     "CalendarEventDetails_Reminder": "Reminder",
     "CalendarEventDetails_ShowAs": "Show as",
+    "CalendarEventResponse_Accept": "Accept",
+    "CalendarEventResponse_AcceptedResponse": "Accepted",
+    "CalendarEventResponse_Decline": "Decline",
+    "CalendarEventResponse_DeclinedResponse": "Declined",
+    "CalendarEventResponse_NotResponded": "Not Responded",
+    "CalendarEventResponse_Tentative": "Tentative",
+    "CalendarEventResponse_TentativeResponse": "Tentatively Accepted",
     "CalendarItem_DetailsPopup_JoinOnline": "Join online",
     "CalendarItem_DetailsPopup_ViewEventButton": "View event",
     "CalendarItem_DetailsPopup_ViewSeriesButton": "View series",