Add Start and Position to User

Users/UsersManager.cs

@@ -11,13 +11,15 @@ namespace Akari.Provider.WaveshareUART.Users
 {
     public class UsersManager
     {
+        public const int RangeLength = 20;
         public const string UsersFilePath = "users.yaml";
 
-        private readonly List<User> _users;
-        private IDeserializer _deserializer;
-        private ISerializer _serializer;
-
         public int Count => _users.Count;
+        public IReadOnlyList<User> Users => _users.AsReadOnly();
+
+        private readonly List<User> _users;
+        private readonly IDeserializer _deserializer;
+        private readonly ISerializer _serializer;
 
         public UsersManager()
         {
@@ -43,23 +45,34 @@ namespace Akari.Provider.WaveshareUART.Users
         }
 
         public User this[string name] => _users.FirstOrDefault(u => u.Name.Equals(name, StringComparison.OrdinalIgnoreCase));
+        public User this[ushort start] => _users.FirstOrDefault(u => u.Start == start);
 
-        public void Add(User user)
+        public void Add(string name, string token)
         {
-            _users.Add(user);
+            // Find first available position
+            var usedStarts = _users.Select(u => u.Start).ToHashSet();
+            int start;
+
+            for (start = 0; start < ushort.MaxValue; start += RangeLength)
+            {
+                if (!usedStarts.Contains((ushort)start))
+                {
+                    break;
+                }
+            }
+
+            // Add user
+            _users.Add(new User(name, token, (ushort)start));
 
             Save();
         }
 
-        public IReadOnlyCollection<User> GetAll()
-        {
-            return _users.AsReadOnly();
-        }
-
         public void Remove(User user)
         {
             _users.Remove(user);
 
+            // TODO Remove fingerprints
+
             Save();
         }
 
@@ -67,6 +80,8 @@ namespace Akari.Provider.WaveshareUART.Users
         {
             _users.Clear();
 
+            // TODO Remove fingerprints
+
             Save();
         }