fish-station/Content.Client/_Sunrise/Overlays/Systems/DogVisionSystem.cs

// Inspired by Nyanotrasen

using Content.Shared.Abilities;
using Robust.Client.GameObjects;
using Robust.Client.Graphics;
using Robust.Client.Player;
using Robust.Shared.Player;

namespace Content.Client._Sunrise.Overlays;
public sealed class DogVisionSystem : EntitySystem
{
    [Dependency] private readonly IPlayerManager _player = default!;
    [Dependency] private readonly IOverlayManager _overlayMan = default!;

    private DogVisionOverlay _overlay = default!;

    public override void Initialize()
    {
        base.Initialize();

        SubscribeLocalEvent<DogVisionComponent, ComponentInit>(OnDogVisionInit);
        SubscribeLocalEvent<DogVisionComponent, ComponentShutdown>(OnDogVisionShutdown);

        SubscribeLocalEvent<DogVisionComponent, LocalPlayerAttachedEvent>(OnPlayerAttached);
        SubscribeLocalEvent<DogVisionComponent, LocalPlayerDetachedEvent>(OnPlayerDetached);

        _overlay = new();
    }

    private void OnPlayerAttached(EntityUid uid, DogVisionComponent component, LocalPlayerAttachedEvent args)
    {
        _overlayMan.AddOverlay(_overlay);
    }

    private void OnPlayerDetached(EntityUid uid, DogVisionComponent component, LocalPlayerDetachedEvent args)
    {
        _overlayMan.RemoveOverlay(_overlay);
    }

    private void OnDogVisionInit(EntityUid uid, DogVisionComponent component, ComponentInit args)
    {
        if (_player.LocalPlayer?.ControlledEntity == uid)
            _overlayMan.AddOverlay(_overlay);
    }

    private void OnDogVisionShutdown(EntityUid uid, DogVisionComponent component, ComponentShutdown args)
    {
        if (_player.LocalPlayer?.ControlledEntity == uid)
        {
            _overlayMan.RemoveOverlay(_overlay);
        }
    }
}