Initial commit.

Wino.Core.Domain/Models/Requests/IUIMessage.cs

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+namespace Wino.Core.Domain.Models.Requests
+{
+    /// <summary>
+    /// Interface for all messages to report UI changes from synchronizers to UI.
+    /// None of these messages can't run a code that manipulates database.
+    /// They are sent either from processor or view models to signal some other
+    /// parts of the application.
+    /// </summary>
+    public interface IUIMessage;
+}

Wino.Core.Domain/Models/Requests/RequestBase.cs

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+using System.Collections.Generic;
+using Wino.Core.Domain.Entities;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Core.Domain.Models.Requests
+{
+    public abstract record RequestBase<TBatchRequestType>(MailCopy Item, MailSynchronizerOperation Operation) : IRequest
+        where TBatchRequestType : IBatchChangeRequest
+    {
+        public abstract IBatchChangeRequest CreateBatch(IEnumerable<IRequest> requests);
+        public abstract void ApplyUIChanges();
+        public abstract void RevertUIChanges();
+    }
+
+    public abstract record FolderRequestBase(MailItemFolder Folder, MailSynchronizerOperation Operation) : IFolderRequest
+    {
+        public abstract void ApplyUIChanges();
+        public abstract void RevertUIChanges();
+    }
+
+    public abstract record BatchRequestBase(IEnumerable<IRequest> Items, MailSynchronizerOperation Operation) : IBatchChangeRequest
+    {
+        public abstract void ApplyUIChanges();
+        public abstract void RevertUIChanges();
+    }
+}

Wino.Core.Domain/Models/Requests/ToggleRequestRule.cs

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+using System;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.MailItem;
+
+namespace Wino.Core.Domain.Models.Requests
+{
+    /// <summary>
+    /// Defines a single rule for toggling user actions if needed.
+    /// For example: If user wants to mark a mail as read, but it's already read, then it should be marked as unread.
+    /// </summary>
+    /// <param name="SourceAction"></param>
+    /// <param name="TargetAction"></param>
+    /// <param name="Condition"></param>
+    public record ToggleRequestRule(MailOperation SourceAction, MailOperation TargetAction, Func<IMailItem, bool> Condition);
+}