resolve tagging index issues ...

Providers/XBaseTagProvider.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -70,8 +71,8 @@ namespace xTagService.Providers
 
             //
             // Retrieve Last Index ...
-            var referencesCount = await CountReferences(providedForId);
-            if (forIndex > referencesCount - 1)
+            var maxIndex = (await GetReferencingIndexes(providedForId)).Max();
+            if (forIndex > maxIndex)
             {
                 XException.NotFound.Throw();
             }
@@ -142,22 +143,40 @@ namespace xTagService.Providers
         {
             //
             // Validate ...
-            var isValid = 
+            var isValid =
                 !providedForId.IsNull();
-                if (!isValid)
+            if (!isValid)
             {
-                xExceptios.InvalidArgs.Throw();
+                XException.InvalidArgs.Throw();
             }
 
             //
             var identifier = GetProvidedID(providedForId);
 
             //
-            var result = TagProvider.Repository
-                .AsQueryable()
-                .Where(te => te.References.Contains(identifier))
-                .Select(te => te.References)
-                ; 
+            IEnumerable<XReference<TKey>> result = new List<XReference<TKey>>();
+            try
+            {
+                //
+                result = TagProvider.Repository
+                    .AsQueryable()
+                    .Where(te => te.References.Contains(identifier))
+                    .Select(te => te.References)
+                    .ToList()
+                    .SelectMany(tr => tr.ParseXReferenceList<TKey>())
+                    .Where(tr => tr.ProvidedFor == Provider && $"{tr.ReferencedTo}" == $"{providedForId}")
+                    .OrderBy(tr => tr.Index)
+                    .AsEnumerable()
+                    ;
+            }
+            catch (Exception ex)
+            {
+                //
+                Console.WriteLine($"{ex}");
+            }
+
+            //
+            return await Task.FromResult(result);
         }
 
         /// <summary>
@@ -419,6 +438,10 @@ namespace xTagService.Providers
                 XException.NotFound.Throw();
             }
 
+            //
+            // Reading Referencing Indexes ...
+            var indexes = await GetReferencingIndexes(providedForId);
+
             //
             // Check Model Reference to ID ...
             var referencesCount = await CountReferences(providedForId);
@@ -463,13 +486,21 @@ namespace xTagService.Providers
                 XException.ActionFailed.Throw();
             }
 
+            //
+            // Reading All References ...
+            // var references = await GetAllReferences(providedForId);
+
+            //
+            // Get Max Exists Indexes ...
+            var maxIndex = indexes.Max();
+
             //
             // Here We Have to Re Arrange Indexed ...
-            if (reference.Index < referencesCount - 1)
+            if (reference.Index < maxIndex)
             {
                 //
                 var startIndex = reference.Index + 1;
-                for (int i = startIndex; i < referencesCount; i++)
+                for (int i = startIndex; i <= maxIndex; i++)
                 {
                     //
                     var dto = await GetReference(
@@ -825,6 +856,38 @@ namespace xTagService.Providers
             return result;
         }
 
+        private async Task<IEnumerable<int>> GetReferencingIndexes(TKey providedForId)
+        {
+            //
+            // Validate ...
+            var isValid =
+                !providedForId.IsNull();
+            if (!isValid)
+            {
+                XException.InvalidArgs.Throw();
+            }
+
+            //
+            var result = new List<int>();
+            var referencings = await GetAllReferencings(providedForId);
+            isValid = !referencings.IsNull() &&
+                referencings.HasChild();
+            if (!isValid)
+            {
+                return result;
+            }
+
+            //
+            result =
+                referencings
+                    .OrderBy(r => r.Index)
+                    .Select(r => r.Index)
+                    .ToList();
+
+            //
+            return result;
+        }
+
         private XTagDto GetTagByTag(string tag)
         {
             //