CatStation/Content.Shared/EntityEffects/Effects/AddUserInterfacesEntityEffectSystem.cs

namespace Content.Shared.EntityEffects.Effects;

/// <summary>
/// Adds or replaces the specified user interfaces without removing other interfaces.
/// </summary>
/// <inheritdoc cref="EntityEffectSystem{T, TEffect}"/>
public sealed partial class AddUserInterfacesEntityEffectSystem : EntityEffectSystem<MetaDataComponent, AddUserInterfaces>
{
    [Dependency] private SharedUserInterfaceSystem _ui = default!;

    protected override void Effect(Entity<MetaDataComponent> entity, ref EntityEffectEvent<AddUserInterfaces> args)
    {
        var userInterface = EnsureComp<UserInterfaceComponent>(entity);

        foreach (var (key, data) in args.Effect.Interfaces)
        {
            _ui.SetUi((entity.Owner, userInterface), key, data);
        }
    }
}

/// <inheritdoc cref="EntityEffect"/>
public sealed partial class AddUserInterfaces : EntityEffectBase<AddUserInterfaces>
{
    /// <summary>
    /// Interfaces to add or replace, keyed by their UI enum key.
    /// </summary>
    [DataField(required: true)]
    public Dictionary<Enum, InterfaceData> Interfaces = new();
}