wip for todoist -> habitica syncing process

Habitica.Todoist.Integration.Services/TodoistExtensions.cs

@@ -0,0 +1,41 @@
+using Habitica.Todoist.Integration.Data;
+using Habitica.Todoist.Integration.Model.Storage;
+using Habitica.Todoist.Integration.Model.Todoist;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Habitica.Todoist.Integration.Services
+{
+    public static class TodoistExtensions
+    {
+        public static IEnumerable<Item> WhereAdded(this List<Item> items, TableStorageClient storageClient, string userId)
+        {
+            return items
+                .Where(x => !storageClient
+                    .Exists<TodoHabitLink>(userId, x.Id) && x.Is_deleted == 0);
+        }
+
+        public static IEnumerable<Item> WhereUpdated(this List<Item> items, TableStorageClient storageClient, string userId)
+        {
+            return items
+                .Where(x => storageClient
+                    .Exists<TodoHabitLink>(userId, x.Id) && x.Is_deleted == 0 && x.Date_completed == null);
+        }
+
+        public static IEnumerable<Item> WhereCompleted(this List<Item> items, TableStorageClient storageClient, string userId)
+        {
+            return items
+                .Where(x => storageClient
+                    .Exists<TodoHabitLink>(userId, x.Id) && x.Is_deleted == 0 && x.Date_completed != null);
+        }
+
+        public static IEnumerable<Item> WhereDeleted(this List<Item> items, TableStorageClient storageClient, string userId)
+        {
+            return items
+                .Where(x => storageClient
+                    .Exists<TodoHabitLink>(userId, x.Id) && x.Is_deleted == 1);
+        }
+    }
+}