redesign: Agents

src/Agents/World.cs

@@ -0,0 +1,45 @@
+using Godot;
+using Polonium.Resources;
+
+namespace Polonium.Agents;
+
+public abstract partial class World : Node 
+{
+    private WorldModel Model { get; set; }
+    public HashSet<Agent> Agents { get; } = new();
+    public Knowledge CommonKnowledge { get; set; }
+
+    public override void _Ready()
+    {
+        Model = GetNode<WorldModel>("WorldModel");
+        CommonKnowledge = GetNode<Knowledge>("CommonKnowledge");
+        Model.CommonKnowledgeUpdated += CommonKnowledgeUpdated;
+        Model.PrivateKnowledgeUpdated += ForwardPrivateKnowledgeUpdated;
+        base._Ready();
+    }
+
+    public void RegisterAgent(Agent agent)
+    {
+        Agents.Add(agent);
+        agent.ActionExecuted += Model.ActionExecuted;
+    }
+
+    public virtual void Enter()
+    {
+        PoloniumRegistry.Instance.CurrentWorld = this;
+    }
+
+    public virtual void Exit()
+    {
+        PoloniumRegistry.Instance.CurrentWorld = null;
+    }
+    
+    public void CommonKnowledgeUpdated(KnowledgePatch update) => update.Patch(CommonKnowledge);
+
+    public void ForwardPrivateKnowledgeUpdated(SignalHeader header, KnowledgePatch update)
+    {
+        foreach (Agent receiver in header.ResolveReceivers())
+            receiver.UpdateKnowledge(update);
+    }
+    
+}