ninja 2 electric boogaloo (#15534)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Ninja/Systems/EnergyKatanaSystem.cs

@@ -0,0 +1,47 @@
+using Content.Shared.Inventory.Events;
+using Content.Shared.Ninja.Components;
+
+namespace Content.Shared.Ninja.Systems;
+
+/// <summary>
+/// System for katana binding and dash events. Recalling is handled by the suit.
+/// </summary>
+public sealed class EnergyKatanaSystem : EntitySystem
+{
+    [Dependency] private readonly SharedSpaceNinjaSystem _ninja = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<EnergyKatanaComponent, GotEquippedEvent>(OnEquipped);
+        SubscribeLocalEvent<EnergyKatanaComponent, AddDashActionEvent>(OnAddDashAction);
+        SubscribeLocalEvent<EnergyKatanaComponent, DashAttemptEvent>(OnDashAttempt);
+    }
+
+    /// <summary>
+    /// When equipped by a ninja, try to bind it.
+    /// </summary>
+    private void OnEquipped(EntityUid uid, EnergyKatanaComponent comp, GotEquippedEvent args)
+    {
+        // check if user isnt a ninja or already has a katana bound
+        var user = args.Equipee;
+        if (!TryComp<SpaceNinjaComponent>(user, out var ninja) || ninja.Katana != null)
+            return;
+
+        // bind it since its unbound
+        _ninja.BindKatana(user, uid, ninja);
+    }
+
+    private void OnAddDashAction(EntityUid uid, EnergyKatanaComponent comp, AddDashActionEvent args)
+    {
+        if (!HasComp<SpaceNinjaComponent>(args.User))
+            args.Cancel();
+    }
+
+    private void OnDashAttempt(EntityUid uid, EnergyKatanaComponent comp, DashAttemptEvent args)
+    {
+        if (!TryComp<SpaceNinjaComponent>(args.User, out var ninja) || ninja.Katana != uid)
+            args.Cancel();
+    }
+}