Refactor simulation and viewer architecture

apps/backend/Simulation/AI/ShipBehaviorStateMachine.cs

@@ -0,0 +1,39 @@
+namespace SpaceGame.Simulation.Api.Simulation;
+
+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-turret"),
+            new ResourceHarvestShipBehaviorState("auto-harvest-gas", "gas", "gas-extractor"),
+            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;
+}