Roller Skates fixes (#21542)

Content.Shared/Clothing/EntitySystems/SkatesSystem.cs

@@ -0,0 +1,50 @@
+using Content.Shared.Inventory.Events;
+using Content.Shared.Movement.Systems;
+using Content.Shared.Damage.Systems;
+using Content.Shared.Movement.Components;
+
+namespace Content.Shared.Clothing;
+
+/// <summary>
+/// Changes the friction and acceleration of the wearer and also the damage on impact variables of thew wearer when hitting a static object.
+/// </summary>
+public sealed class SkatesSystem : EntitySystem
+{
+    [Dependency] private readonly MovementSpeedModifierSystem _move = default!;
+    [Dependency] private readonly DamageOnHighSpeedImpactSystem _impact = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<SkatesComponent, GotEquippedEvent>(OnGotEquipped);
+        SubscribeLocalEvent<SkatesComponent, GotUnequippedEvent>(OnGotUnequipped);
+    }
+
+    /// <summary>
+    /// When item is unequipped from the shoe slot, friction, aceleration and collide on impact return to default settings.
+    /// </summary>
+    public void OnGotUnequipped(EntityUid uid, SkatesComponent component, GotUnequippedEvent args)
+    {
+        if (!TryComp(args.Equipee, out MovementSpeedModifierComponent? speedModifier))
+            return;
+
+        if (args.Slot == "shoes")
+        {
+            _move.ChangeFriction(args.Equipee, MovementSpeedModifierComponent.DefaultFriction, MovementSpeedModifierComponent.DefaultFrictionNoInput, MovementSpeedModifierComponent.DefaultAcceleration, speedModifier);
+            _impact.ChangeCollide(args.Equipee, component.DefaultMinimumSpeed, component.DefaultStunSeconds, component.DefaultDamageCooldown, component.DefaultSpeedDamage);
+        }
+    }
+
+    /// <summary>
+    /// When item is equipped into the shoe slot, friction, acceleration and collide on impact are adjusted.
+    /// </summary>
+    private void OnGotEquipped(EntityUid uid, SkatesComponent component, GotEquippedEvent args)
+    {
+        if (args.Slot == "shoes")
+        { 
+            _move.ChangeFriction(args.Equipee, component.Friction, component.FrictionNoInput, component.Acceleration);
+            _impact.ChangeCollide(args.Equipee, component.MinimumSpeed, component.StunSeconds, component.DamageCooldown, component.SpeedDamage);
+        }
+    }
+}