Intermediate commit rewrite player planet cache

Stars Assistant/Services/PlanetManager.cs

@@ -30,6 +30,11 @@ public class PlanetManager : IDisposable, IEnableLogger
                 .Filter(planet => planet.OwnerId == Game.Player.Name)
                 .Transform(planet => new PlayerPlanetViewModel(planet));
 
+    /// <summary>
+    /// Cache with all player planets, indexed by planet name.
+    /// </summary>
+    private SourceCache<PlayerPlanetViewModel, string> _playerPlanets = new(p => p.Planet.Name);
+    
     /// <summary>
     /// Observable subject to trigger when we update the planet cache, allows the
     /// UI to react to it.
@@ -64,6 +69,27 @@ public class PlanetManager : IDisposable, IEnableLogger
                 innerCache.AddOrUpdate(allPlanets);
             }
         );
+        
+        var allPlayerPlanets = allPlanets.Where(planet => planet.OwnerId == Game.Player.Name);
+        var allPlayerCacheKeys = _playerPlanets.Keys.ToList();
+        var playerPlanetNames = from p in allPlayerPlanets select p.Name;
+        var playerPlanetsToDelete = allPlayerCacheKeys.Except(playerPlanetNames);
+        
+        _playerPlanets.Edit(innerCache => 
+            {
+                foreach (var name in playerPlanetsToDelete)
+                    innerCache.RemoveKey(name);
+                foreach (var planet in allPlayerPlanets)
+                {
+                    var playerPlanet = innerCache.Lookup(planet.Name);
+                    if (playerPlanet.HasValue)
+                        playerPlanet.Value.Planet = planet;
+                    else
+                        innerCache.Add(new PlayerPlanetViewModel(planet));
+                }
+            }
+        );
+        
         _planetsReloadedSubject.OnNext(Unit.Default);
     }