a better result

src/isnd/Data/Catalog/PackageRegistration.cs

@@ -0,0 +1,53 @@
+using isnd.Data.Packages;
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace isnd.Data.Catalog
+{
+    public class PackageRegistration : Permalink
+    {
+
+        public PackageRegistration(string url) : base(url)
+        {
+            Items = new List<CatalogPage>();
+        }
+
+        public PackageRegistration(string bid, string id, string apiBase, IEnumerable<Packages.Package> pkgs) : base(bid + $"/{id}/index.json")
+        {
+            Items = new List<CatalogPage>();
+            long cnid = 0;
+            var pkgsGroups = pkgs.GroupBy(l => l.Id);
+            // Pour tous les groupes par Id
+            foreach (var gsp in pkgsGroups)
+            {
+                var pkgsbi = gsp.ToArray();
+                List<PackageVersion> versions = new List<PackageVersion>();
+
+                foreach(var l in pkgsbi.Select(p => p.Versions))
+                {
+                    versions.AddRange(l);
+                    foreach (var pv in l)
+                    {
+                        if (pv.CommitNId> cnid)
+                        {
+                            cnid = pv.CommitNId;
+                        }
+                    }
+                }
+                Items.Add(new CatalogPage(bid, gsp.Key, apiBase, versions));
+            }
+            CommitId = cnid.ToString();
+        }
+
+        [JsonProperty("count")]
+        public int Count { get => Items.Count; }
+
+        [JsonProperty("items")]
+        public List<CatalogPage> Items { get; set; }
+
+        public string CommitId { get; set; }
+        public DateTimeOffset CommitTimeStamp { get; internal set; }
+    }
+}