OldThink/Content.Server/GameObjects/EntitySystems/Click/ExamineSystem.cs

using Content.Shared.GameObjects.EntitySystemMessages;
using Content.Shared.GameObjects.EntitySystems;
using JetBrains.Annotations;
using Robust.Server.Interfaces.Player;
using Robust.Shared.GameObjects;
using Robust.Shared.Interfaces.GameObjects;
using Robust.Shared.IoC;
using Robust.Shared.Localization;
using Robust.Shared.Utility;

namespace Content.Server.GameObjects.EntitySystems.Click
{
    [UsedImplicitly]
    public class ExamineSystem : ExamineSystemShared
    {
        private static readonly FormattedMessage _entityNotFoundMessage;

        static ExamineSystem()
        {
            _entityNotFoundMessage = new FormattedMessage();
            _entityNotFoundMessage.AddText(Loc.GetString("That entity doesn't exist"));
        }

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

            SubscribeNetworkEvent<ExamineSystemMessages.RequestExamineInfoMessage>(ExamineInfoRequest);

            IoCManager.InjectDependencies(this);
        }

        private void ExamineInfoRequest(ExamineSystemMessages.RequestExamineInfoMessage request, EntitySessionEventArgs eventArgs)
        {
            var player = (IPlayerSession) eventArgs.SenderSession;
            var session = eventArgs.SenderSession;
            var playerEnt = session.AttachedEntity;
            var channel = player.ConnectedClient;

            if (playerEnt == null
                || !EntityManager.TryGetEntity(request.EntityUid, out var entity)
                || !CanExamine(playerEnt, entity))
            {
                RaiseNetworkEvent(new ExamineSystemMessages.ExamineInfoResponseMessage(
                    request.EntityUid, _entityNotFoundMessage), channel);
                return;
            }

            var text = GetExamineText(entity, player.AttachedEntity);
            RaiseNetworkEvent(new ExamineSystemMessages.ExamineInfoResponseMessage(request.EntityUid, text), channel);
        }
    }
}