OldThink/Content.Shared/PowerCell/SharedPowerCellSystem.cs

using Content.Shared.PowerCell.Components;
using Robust.Shared.Containers;

namespace Content.Shared.PowerCell;

public abstract class SharedPowerCellSystem : EntitySystem
{
    public override void Initialize()
    {
        base.Initialize();
        SubscribeLocalEvent<PowerCellSlotComponent, EntInsertedIntoContainerMessage>(OnCellInserted);
        SubscribeLocalEvent<PowerCellSlotComponent, EntRemovedFromContainerMessage>(OnCellRemoved);
        SubscribeLocalEvent<PowerCellSlotComponent, ContainerIsInsertingAttemptEvent>(OnCellInsertAttempt);
    }

    private void OnCellInsertAttempt(EntityUid uid, PowerCellSlotComponent component, ContainerIsInsertingAttemptEvent args)
    {
        if (!component.Initialized)
            return;

        if (args.Container.ID != component.CellSlotId)
            return;

        if (!HasComp<PowerCellComponent>(args.EntityUid))
        {
            args.Cancel();
        }
    }

    private void OnCellInserted(EntityUid uid, PowerCellSlotComponent component, EntInsertedIntoContainerMessage args)
    {
        if (!component.Initialized)
            return;

        if (args.Container.ID != component.CellSlotId)
            return;

        RaiseLocalEvent(uid, new PowerCellChangedEvent(false), false);
    }

    private void OnCellRemoved(EntityUid uid, PowerCellSlotComponent component, EntRemovedFromContainerMessage args)
    {
        if (args.Container.ID != component.CellSlotId)
            return;

        RaiseLocalEvent(uid, new PowerCellChangedEvent(true), false);
    }
}