Refactored impa synchronization.

Wino.Core.Domain/Entities/Mail/MailItemFolder.cs

@@ -29,6 +29,8 @@ public class MailItemFolder : IMailItemFolder
     // For IMAP
     public uint UidValidity { get; set; }
     public long HighestModeSeq { get; set; }
+    public uint HighestKnownUid { get; set; }
+    public DateTime? LastUidReconcileUtc { get; set; }
 
     /// <summary>
     /// Outlook shares delta changes per-folder. Gmail is for per-account.

Wino.Core.Domain/Interfaces/IFolderService.cs

@@ -79,6 +79,13 @@ public interface IFolderService
     /// <param name="folder">Folder to update.</param>
     Task UpdateFolderAsync(MailItemFolder folder);
 
+    /// <summary>
+    /// Updates only IMAP HighestModeSeq for the given folder.
+    /// </summary>
+    /// <param name="folderId">Folder id to update.</param>
+    /// <param name="highestModeSeq">Latest known mod-seq value.</param>
+    Task UpdateFolderHighestModeSeqAsync(Guid folderId, long highestModeSeq);
+
     /// <summary>
     /// Returns the active folder menu items for the given account for UI.
     /// </summary>

Wino.Core.Domain/Interfaces/IImapSynchronizationStrategyProvider.cs

@@ -1,11 +0,0 @@
-using MailKit.Net.Imap;
-
-namespace Wino.Core.Domain.Interfaces;
-
-/// <summary>
-/// Provides a synchronization strategy for synchronizing IMAP folders based on the server capabilities.
-/// </summary>
-public interface IImapSynchronizationStrategyProvider
-{
-    IImapSynchronizerStrategy GetSynchronizationStrategy(IImapClient client);
-}

Wino.Core.Domain/Interfaces/IImapSynchronizerStrategy.cs

@@ -1,40 +0,0 @@
-using System.Collections.Generic;
-using System.Threading;
-using System.Threading.Tasks;
-using MailKit;
-using MailKit.Net.Imap;
-using Wino.Core.Domain.Entities.Mail;
-
-namespace Wino.Core.Domain.Interfaces;
-
-public interface IImapSynchronizerStrategy
-{
-    /// <summary>
-    /// Synchronizes given folder with the ImapClient client from the client pool.
-    /// </summary>
-    /// <param name="client">Client to perform sync with. I love Mira and Jasminka</param>
-    /// <param name="folder">Folder to synchronize.</param>
-    /// <param name="synchronizer">Imap synchronizer that downloads messages.</param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    /// <returns>List of new downloaded message ids that don't exist locally.</returns>
-    Task<List<string>> HandleSynchronizationAsync(IImapClient client,
-                                                  MailItemFolder folder,
-                                                  IImapSynchronizer synchronizer,
-                                                  CancellationToken cancellationToken = default);
-
-    /// <summary>
-    /// Downloads given set of messages from the folder.
-    /// Folder is expected to be opened and synchronizer is connected.
-    /// </summary>
-    /// <param name="synchronizer">Synchronizer that performs the action.</param>
-    /// <param name="remoteFolder">Remote folder to download messages from.</param>
-    /// <param name="localFolder">Local folder to assign mails to.</param>
-    /// <param name="uniqueIdSet">Set of message uniqueids.</param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    Task DownloadMessagesAsync(IImapSynchronizer synchronizer,
-                               IMailFolder remoteFolder,
-                               MailItemFolder localFolder,
-                               UniqueIdSet uniqueIdSet,
-                               CancellationToken cancellationToken = default);
-}
-

Wino.Core.Domain/Models/Folders/IMailItemFolder.cs

@@ -10,12 +10,14 @@ public interface IMailItemFolder
     string DeltaToken { get; set; }
     string FolderName { get; set; }
     long HighestModeSeq { get; set; }
+    uint HighestKnownUid { get; set; }
     Guid Id { get; set; }
     bool IsHidden { get; set; }
     bool IsSticky { get; set; }
     bool IsSynchronizationEnabled { get; set; }
     bool IsSystemFolder { get; set; }
     DateTime? LastSynchronizedDate { get; set; }
+    DateTime? LastUidReconcileUtc { get; set; }
     Guid MailAccountId { get; set; }
     string ParentRemoteFolderId { get; set; }
     string RemoteFolderId { get; set; }