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src/isnd/Data/Catalog/RegistrationPage.cs

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+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 : HappyIdOwner
+    {
+        [JsonProperty("@id")]
+        public string Id { get => GetId(); }
+        private readonly string pkgid;
+        private readonly List<PackageVersion> items;
+
+        protected string Bid { get ; private set; }
+        protected string ExternalUrl { get; }
+
+        public RegistrationPage (string bid, string pkgid, string extUrl) : base(bid + "/" + pkgid + "/index.json")
+        {
+            Bid = bid;
+            Parent = Bid + $"/{pkgid}/index.json";
+            ExternalUrl = extUrl;
+            this.items = new List<PackageVersion>();
+            this.pkgid = pkgid;
+        }
+
+        public RegistrationPage(string bid, string pkgid, string extUrl, List<PackageVersion> versions) : this(bid, pkgid, extUrl)
+        {
+             AddVersionRange(versions);
+        }
+
+        public string GetPackageId()
+        {
+            return pkgid;
+        }
+
+        /// <summary>
+        /// The array of registration leaves and their associate metadata
+        /// </summary>
+        /// <value></value>
+        [JsonProperty("items")]
+
+        public CatalogEntry[] Items { get => items.Select((p) => p.ToLeave(Bid, ExternalUrl)).ToArray(); }
+
+        public void AddVersionRange(IEnumerable<PackageVersion> vitems)
+        {
+            if (vitems.Count() == 0) return;
+            NuGetVersion upper = null;
+            NuGetVersion lower = null;
+            if (Lower!=null) lower = new NuGetVersion(Lower);
+            if (Upper!=null) upper = new NuGetVersion(Upper);
+
+            // Assert.True(items.All(p=>p.Id == id));
+            long commitMax = 0;
+            foreach (var p in vitems)
+            {
+                if (items.Contains(p)) continue;
+
+                if (upper == null) upper = p.NugetVersion;
+                else if ( upper < p.NugetVersion) upper = p.NugetVersion;
+
+                if (lower == null) lower = p.NugetVersion;
+                else if (lower > p.NugetVersion) lower = p.NugetVersion;
+
+                if (p.CommitNId > commitMax) commitMax = p.CommitNId;
+                items.Add(p);
+            }
+            Upper = upper.ToFullString();
+            Lower = lower.ToFullString();
+            CommitId = commitMax.ToString();
+        }
+
+        /// <summary>
+        /// The highest SemVer 2.0.0 version in the page (inclusive)
+        /// </summary>
+        /// <value></value>
+        [JsonProperty("upper"), JsonRequired]
+        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 string Lower { get; private set; }
+
+        /// <summary>
+        /// The URL to the registration index
+        /// </summary>
+        /// <value></value>
+        [JsonProperty("parent")]
+        public string Parent { get; set; }
+
+        [JsonProperty("count")]
+        public int Count { get => items.Count; }
+        public string CommitId { get; internal set; }
+        public DateTime CommitTimeStamp { get; internal set; }
+    }
+}