A valid package index page

src/isnd/Data/Catalog/RegistrationPage.cs

@@ -1,18 +1,62 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
+using isnd.Data.Packages;
 using Newtonsoft.Json;
+using NuGet.Versioning;
 
 namespace isnd.Data.Catalog
 {
-    public class RegistrationPage 
+    public class RegistrationPage
     {
         [JsonProperty("@id")]
         [JsonRequired]
-        public string Id { get; }
-        public RegistrationPage (string id)
+        public string Id { get; protected set;}
+
+        private List<PackageVersion> items;
+
+        protected string Bid { get ; private set; }
+        public string DlBase { get; }
+
+        public RegistrationPage (string bid, string dlBase)
         {
-            Id = id;
-            Items = new List<RegistrationLeaf>();
+            Bid = bid;
+            DlBase = dlBase;
+            this.items = new List<PackageVersion>();
+        }
+
+        public RegistrationPage (string bid, string pkgid, string dlBase, IEnumerable<PackageVersion> items)
+        {
+            Bid = bid;
+            Parent = Bid + "/index.json";
+            DlBase = dlBase;
+            this.items = new List<PackageVersion>(items);
+            SetPackageId(pkgid);
+            UpdateCompact();
+        }
+
+        protected void SetPackageId(string pkgid)
+        {
+            this.Id = Bid + "/" + pkgid + "/index.json";
+        }
+
+        private void UpdateCompact()
+        {
+            NuGetVersion upper = new NuGetVersion(0,0,0);
+
+            // Assert.True(items.All(p=>p.Id == id));
+            
+            foreach (var p in items)
+            {
+                if (upper < p.NugetVersion) upper = p.NugetVersion;
+            }
+            Upper = upper.ToFullString();
+            NuGetVersion lower = upper;
+            foreach (var p in items)
+            {
+                if (lower > p.NugetVersion) lower = p.NugetVersion;
+            }
+            Lower = lower.ToFullString();
         }
 
         /// <summary>
@@ -21,19 +65,26 @@ namespace isnd.Data.Catalog
         /// <value></value>
         [JsonProperty("items")]
 
-        public List<RegistrationLeaf> Items { get; set; }
+        public RegistrationLeaf[] Items { get => items.Select((p) => p.ToLeave(Bid, DlBase)).ToArray(); }
+
+        public void AddVersionRange(IEnumerable<PackageVersion> vitems)
+        {
+            if (vitems.Count() == 0) return;
+            items.AddRange(vitems);
+            UpdateCompact();
+        }
         /// <summary>
         /// The highest SemVer 2.0.0 version in the page (inclusive)
         /// </summary>
         /// <value></value>
         [JsonProperty("upper"), JsonRequired]
-        public Version Upper { get; set; }
+        public string Upper { get; private set; }
         /// <summary>
         /// The lowest SemVer 2.0.0 version in the page (inclusive)
         /// </summary>
         /// <value></value>
         [JsonProperty("lower"), JsonRequired]
-        public Version Lower { get; set; }
+        public string Lower { get; private set; }
 
         /// <summary>
         /// The URL to the registration index