Refactor backend into domain-first slices

apps/backend/Ships/AI/ShipBehaviorStateMachine.cs

@@ -0,0 +1,39 @@
+
+namespace SpaceGame.Api.Ships.AI;
+
+internal sealed class ShipBehaviorStateMachine
+{
+  private readonly IReadOnlyDictionary<string, IShipBehaviorState> states;
+  private readonly IShipBehaviorState fallbackState;
+
+  private ShipBehaviorStateMachine(IReadOnlyDictionary<string, IShipBehaviorState> states, IShipBehaviorState fallbackState)
+  {
+    this.states = states;
+    this.fallbackState = fallbackState;
+  }
+
+  public static ShipBehaviorStateMachine CreateDefault()
+  {
+    var idleState = new IdleShipBehaviorState();
+    var knownStates = new IShipBehaviorState[]
+    {
+            idleState,
+            new PatrolShipBehaviorState(),
+            new ResourceHarvestShipBehaviorState("auto-mine", "ore", "mining"),
+            new ConstructStationShipBehaviorState(),
+    };
+
+    return new ShipBehaviorStateMachine(
+        knownStates.ToDictionary(state => state.Kind, StringComparer.Ordinal),
+        idleState);
+  }
+
+  public void Plan(SimulationEngine engine, ShipRuntime ship, SimulationWorld world) =>
+      Resolve(ship.DefaultBehavior.Kind).Plan(engine, ship, world);
+
+  public void ApplyEvent(SimulationEngine engine, ShipRuntime ship, SimulationWorld world, string controllerEvent) =>
+      Resolve(ship.DefaultBehavior.Kind).ApplyEvent(engine, ship, world, controllerEvent);
+
+  private IShipBehaviorState Resolve(string kind) =>
+      states.TryGetValue(kind, out var state) ? state : fallbackState;
+}