👔 Complete #26 -- Code PlayerManager

Sources/Model/PlayerManager.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -8,25 +10,84 @@ namespace Model
 {
     public class PlayerManager : IManager<Player>
     {
-        public Player Add(ref Player toAdd)
+        /// <summary>
+        /// a hashset of the players that this manager is in charge of
+        /// <br/>
+        /// the hash is based on the player's unique property (name)
+        /// </summary>
+        private readonly HashSet<Player> players;
+
+        public PlayerManager()
         {
-            throw new NotImplementedException();
+            players = new HashSet<Player>();
         }
-        public IEnumerable<Player> GetAll()
+        /// <summary>
+        /// add a new player
+        /// </summary>
+        /// <param name="toAdd">player to be added</param>
+        /// <returns>added player, or null if <paramref name="toAdd"/> was null</returns>
+        public Player Add(ref Player toAdd)
         {
-            throw new NotImplementedException();
+            if (toAdd != null)
+            {
+                players.Add(toAdd);
+            }
+            return toAdd;
         }
+
+        /// <summary>
+        /// may never get implemented in the model, go through GetOneByName() in the meantime
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        /// <exception cref="NotImplementedException"></exception>
         public Player GetOneById(int id)
         {
-            throw new NotImplementedException();
+            throw new NotImplementedException("may never get implemented\ngo through GetOneByName() in the meantime");
         }
-        public void Remove(ref Player toRemove)
+
+        /// <summary>
+        /// finds the player with that name and returns A COPY OF IT
+        /// <br/>
+        /// that copy does not belong to this manager's players, so it should not be modified 
+        /// </summary>
+        /// <param name="name">a player's unique name</param>
+        /// <returns>player with said name</returns>
+        public Player GetOneByName(string name)
         {
-            throw new NotImplementedException();
+            if (!String.IsNullOrEmpty(name))
+            {
+                Player result = players.Where(p => p.Name.Equals(name)).FirstOrDefault();
+                return new Player(result.Name); // will return null if no such player exists
+            }
+            return null; // we also want ot return null if no name was provided
         }
+
+        /// </summary>
+        /// get a READ ONLY enumerable of all players belonging to this manager
+        /// </summary>
+        /// <returns>a readonly list of all this manager's players</returns>
+        public IEnumerable<Player> GetAll() => players.AsEnumerable();
+
+        /// <summary>
+        /// update a player from <paramref name="before"/> to <paramref name="after"/>
+        /// </summary>
+        /// <param name="before">player to be updated</param>
+        /// <param name="after">player in the state that it needs to be in after the update</param>
+        /// <returns>updated player</returns>
         public Player Update(ref Player before, ref Player after)
         {
-            throw new NotImplementedException();
+            Remove(ref before);
+            return Add(ref after);
+        }
+
+        /// <summary>
+        /// remove a player
+        /// </summary>
+        /// <param name="toRemove">player to be removed</param>
+        public void Remove(ref Player toRemove)
+        {
+            players.Remove(toRemove);
         }
     }
 }