Added Hemophilia Trait (#38224)

Co-authored-by: ScarKy0 <scarky0@onet.eu>
Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Content.Shared/Body/Events/BleedModifierEvent.cs

@@ -0,0 +1,9 @@
+namespace Content.Shared.Body.Events;
+
+/// <summary>
+/// Raised on an entity before they bleed to modify the amount.
+/// </summary>
+/// <param name="BleedAmount">The amount of blood the entity will lose.</param>
+/// <param name="BleedReductionAmount">The amount of bleed reduction that will happen.</param>
+[ByRefEvent]
+public record struct BleedModifierEvent(float BleedAmount, float BleedReductionAmount);

Content.Shared/Body/Systems/SharedBloodstreamSystem.cs

@@ -81,10 +81,14 @@ public abstract class SharedBloodstreamSystem : EntitySystem
             // as well as stop their bleeding to a certain extent.
             if (bloodstream.BleedAmount > 0)
             {
+                var ev = new BleedModifierEvent(bloodstream.BleedAmount, bloodstream.BleedReductionAmount);
+                RaiseLocalEvent(uid, ref ev);
+
                 // Blood is removed from the bloodstream at a 1-1 rate with the bleed amount
-                TryModifyBloodLevel((uid, bloodstream), -bloodstream.BleedAmount);
+                TryModifyBloodLevel((uid, bloodstream), -ev.BleedAmount);
+
                 // Bleed rate is reduced by the bleed reduction amount in the bloodstream component.
-                TryModifyBleedAmount((uid, bloodstream), -bloodstream.BleedReductionAmount);
+                TryModifyBleedAmount((uid, bloodstream), -ev.BleedReductionAmount);
             }
 
             // deal bloodloss damage if their blood level is below a threshold.

Content.Shared/Traits/Assorted/HemophiliaComponent.cs

@@ -0,0 +1,16 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Traits.Assorted;
+
+/// <summary>
+/// This component is used for the Hemophilia Trait, it reduces the passive bleed stack reduction amount so entities with it bleed for longer.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class HemophiliaComponent : Component
+{
+    /// <summary>
+    /// What multiplier should be applied to the BleedReduction when an entity bleeds?
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public float HemophiliaBleedReductionMultiplier = 0.33f;
+}

Content.Shared/Traits/Assorted/HemophiliaSystem.cs

@@ -0,0 +1,16 @@
+using Content.Shared.Body.Events;
+
+namespace Content.Shared.Traits.Assorted;
+
+public sealed class HemophiliaSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<HemophiliaComponent, BleedModifierEvent>(OnBleedModifier);
+    }
+
+    private void OnBleedModifier(Entity<HemophiliaComponent> ent, ref BleedModifierEvent args)
+    {
+        args.BleedReductionAmount *= ent.Comp.HemophiliaBleedReductionMultiplier;
+    }
+}