tbd-station-14/Content.Shared/StatusEffectNew/StatusEffectSystem.Relay.cs

using Content.Shared.Movement.Events;
using Content.Shared.Movement.Systems;
using Content.Shared.StatusEffectNew.Components;
using Robust.Shared.Player;

namespace Content.Shared.StatusEffectNew;

public sealed partial class StatusEffectsSystem
{
    private void InitializeRelay()
    {
        SubscribeLocalEvent<StatusEffectContainerComponent, LocalPlayerAttachedEvent>(RelayStatusEffectEvent);
        SubscribeLocalEvent<StatusEffectContainerComponent, LocalPlayerDetachedEvent>(RelayStatusEffectEvent);

        SubscribeLocalEvent<StatusEffectContainerComponent, RefreshFrictionModifiersEvent>(RefRelayStatusEffectEvent);
        SubscribeLocalEvent<StatusEffectContainerComponent, TileFrictionEvent>(RefRelayStatusEffectEvent);
    }

    private void RefRelayStatusEffectEvent<T>(EntityUid uid, StatusEffectContainerComponent component, ref T args) where T : struct
    {
        RelayEvent((uid, component), ref args);
    }

    private void RelayStatusEffectEvent<T>(EntityUid uid, StatusEffectContainerComponent component, T args) where T : class
    {
        RelayEvent((uid, component), args);
    }

    public void RelayEvent<T>(Entity<StatusEffectContainerComponent> statusEffect, ref T args) where T : struct
    {
        // this copies the by-ref event if it is a struct
        var ev = new StatusEffectRelayedEvent<T>(args);
        foreach (var activeEffect in statusEffect.Comp.ActiveStatusEffects?.ContainedEntities ?? [])
        {
            RaiseLocalEvent(activeEffect, ref ev);
        }
        // and now we copy it back
        args = ev.Args;
    }

    public void RelayEvent<T>(Entity<StatusEffectContainerComponent> statusEffect, T args) where T : class
    {
        // this copies the by-ref event if it is a struct
        var ev = new StatusEffectRelayedEvent<T>(args);
        foreach (var activeEffect in statusEffect.Comp.ActiveStatusEffects?.ContainedEntities ?? [])
        {
            RaiseLocalEvent(activeEffect, ref ev);
        }
    }
}

/// <summary>
/// Event wrapper for relayed events.
/// </summary>
[ByRefEvent]
public record struct StatusEffectRelayedEvent<TEvent>(TEvent Args);