Initial commit.

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

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+using System.Collections.Generic;
+using Wino.Core.Domain.Entities;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Models.Folders
+{
+    /// <summary>
+    /// Grouped folder information for the menu for given account.
+    /// </summary>
+    public class AccountFolderTree
+    {
+        public MailAccount Account { get; }
+        public List<IMailItemFolder> Folders { get; set; } = new List<IMailItemFolder>();
+
+        public AccountFolderTree(MailAccount account)
+        {
+            Account = account;
+        }
+
+        public bool HasSpecialTypeFolder(SpecialFolderType type)
+        {
+            foreach (var folderStructure in Folders)
+            {
+                bool hasSpecialFolder = folderStructure.ContainsSpecialFolderType(type);
+
+                if (hasSpecialFolder)
+                    return true;
+            }
+
+            return false;
+        }
+    }
+}

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

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+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Menus;
+
+namespace Wino.Core.Domain.Models.Folders
+{
+    public class FolderOperationMenuItem : MenuOperationItemBase<FolderOperation>, IMenuOperation
+    {
+        protected FolderOperationMenuItem(FolderOperation operation, bool isEnabled) : base(operation, isEnabled) { }
+
+        public static FolderOperationMenuItem Create(FolderOperation operation, bool isEnabled = true)
+            => new FolderOperationMenuItem(operation, isEnabled);
+    }
+}

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

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+using System;
+using System.Collections.Generic;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Models.Folders
+{
+    public interface IMailItemFolder
+    {
+        string BackgroundColorHex { get; set; }
+        string DeltaToken { get; set; }
+        string FolderName { get; set; }
+        long HighestModeSeq { 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; }
+        Guid MailAccountId { get; set; }
+        string ParentRemoteFolderId { get; set; }
+        string RemoteFolderId { get; set; }
+        SpecialFolderType SpecialFolderType { get; set; }
+        string TextColorHex { get; set; }
+        uint UidValidity { get; set; }
+        List<IMailItemFolder> ChildFolders { get; set; }
+        bool IsMoveTarget { get; }
+        bool ShowUnreadCount { get; set; }
+
+        bool ContainsSpecialFolderType(SpecialFolderType type);
+    }
+}