Pathfinder rework (#11452)

Content.Server/NPC/Pathfinding/PathPortal.cs

@@ -0,0 +1,30 @@
+using Robust.Shared.Map;
+
+namespace Content.Server.NPC.Pathfinding;
+
+/// <summary>
+/// Connects 2 disparate locations.
+/// </summary>
+/// <remarks>
+/// For example, 2 docking airlocks connecting 2 graphs, or an actual portal on the same graph.
+/// </remarks>
+public struct PathPortal
+{
+    // Assume for now it's 2-way and code 1-ways later.
+    public readonly int Handle;
+    public readonly EntityCoordinates CoordinatesA;
+    public readonly EntityCoordinates CoordinatesB;
+
+    // TODO: Whenever the chunk rebuilds need to add a neighbor.
+    public PathPortal(int handle, EntityCoordinates coordsA, EntityCoordinates coordsB)
+    {
+        Handle = handle;
+        CoordinatesA = coordsA;
+        CoordinatesB = coordsB;
+    }
+
+    public override int GetHashCode()
+    {
+        return Handle;
+    }
+}