Revert 'Revert 'Solution Entities'' (#23168)

Content.Shared/Chemistry/Components/SolutionManager/SolutionContainerManagerComponent.cs

@@ -1,12 +1,36 @@
 using Content.Shared.Chemistry.EntitySystems;
+using Robust.Shared.Containers;
+using Robust.Shared.GameStates;
 
 namespace Content.Shared.Chemistry.Components.SolutionManager;
 
-[RegisterComponent]
-[Access(typeof(SolutionContainerSystem))]
+/// <summary>
+/// <para>A map of the solution entities contained within this entity.</para>
+/// <para>Every solution entity this maps should have a <see cref="SolutionComponent"/> to track its state and a <see cref="ContainedSolutionComponent"/> to track its container.</para>
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+[Access(typeof(SharedSolutionContainerSystem))]
 public sealed partial class SolutionContainerManagerComponent : Component
 {
-    [DataField("solutions")]
-    [Access(typeof(SolutionContainerSystem), Other = AccessPermissions.ReadExecute)] // FIXME Friends
-    public Dictionary<string, Solution> Solutions = new();
+    /// <summary>
+    /// The default amount of space that will be allocated for solutions in solution containers.
+    /// Most solution containers will only contain 1-2 solutions.
+    /// </summary>
+    public const int DefaultCapacity = 2;
+
+    /// <summary>
+    /// The names of each solution container attached to this entity.
+    /// Actually accessing them must be done via <see cref="ContainerManagerComponent"/>.
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public HashSet<string> Containers = new(DefaultCapacity);
+
+    /// <summary>
+    /// The set of solutions to load onto this entity during mapinit.
+    /// </summary>
+    /// <remarks>
+    /// Should be null after mapinit.
+    /// </remarks>
+    [DataField(serverOnly: true)] // Needs to be serverOnly or these will get loaded on the client and never cleared. Can be reworked when entity spawning is predicted.
+    public Dictionary<string, Solution>? Solutions = null;
 }