tbd-station-14/Content.Server/GameObjects/EntitySystems/VerbSystem.cs

using System.Collections.Generic;
using System.Reflection;
using Content.Shared.GameObjects;
using Robust.Server.Interfaces.Player;
using Robust.Shared.GameObjects.Systems;
using Robust.Shared.Interfaces.GameObjects;
using Robust.Shared.IoC;
using static Content.Shared.GameObjects.EntitySystemMessages.VerbSystemMessages;

namespace Content.Server.GameObjects.EntitySystems
{
    public class VerbSystem : EntitySystem
    {
        #pragma warning disable 649
        [Dependency] private readonly IEntityManager _entityManager;
        [Dependency] private readonly IPlayerManager _playerManager;
        #pragma warning restore 649

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

            SubscribeNetworkEvent<RequestVerbsMessage>(RequestVerbs);
            SubscribeNetworkEvent<UseVerbMessage>(UseVerb);

            IoCManager.InjectDependencies(this);
        }

        private void UseVerb(UseVerbMessage use)
        {
            var channel = use.NetChannel;
            if(channel == null)
                return;

            if (!_entityManager.TryGetEntity(use.EntityUid, out var entity))
            {
                return;
            }

            var session = _playerManager.GetSessionByChannel(channel);
            var userEntity = session.AttachedEntity;

            foreach (var (component, verb) in VerbUtility.GetVerbs(entity))
            {
                if ($"{component.GetType()}:{verb.GetType()}" != use.VerbKey)
                {
                    continue;
                }

                if (verb.RequireInteractionRange)
                {
                    var distanceSquared = (userEntity.Transform.WorldPosition - entity.Transform.WorldPosition)
                        .LengthSquared;
                    if (distanceSquared > VerbUtility.InteractionRangeSquared)
                    {
                        break;
                    }
                }

                verb.Activate(userEntity, component);
                break;
            }

            foreach (var globalVerb in VerbUtility.GetGlobalVerbs(Assembly.GetExecutingAssembly()))
            {
                if (globalVerb.GetType().ToString() != use.VerbKey)
                {
                    continue;
                }

                if (globalVerb.RequireInteractionRange)
                {
                    var distanceSquared = (userEntity.Transform.WorldPosition - entity.Transform.WorldPosition)
                        .LengthSquared;
                    if (distanceSquared > VerbUtility.InteractionRangeSquared)
                    {
                        break;
                    }
                }

                globalVerb.Activate(userEntity, entity);
                break;
            }
        }

        private void RequestVerbs(RequestVerbsMessage req)
        {
            var channel = req.NetChannel;
            if (channel == null)
                return;

            if (!_entityManager.TryGetEntity(req.EntityUid, out var entity))
            {
                return;
            }

            var session = _playerManager.GetSessionByChannel(channel);
            var userEntity = session.AttachedEntity;

            var data = new List<VerbsResponseMessage.VerbData>();
            //Get verbs, component dependent.
            foreach (var (component, verb) in VerbUtility.GetVerbs(entity))
            {
                if (verb.RequireInteractionRange && !VerbUtility.InVerbUseRange(userEntity, entity))
                    continue;
                if (VerbUtility.IsVerbInvisible(verb, userEntity, component, out var vis))
                    continue;

                // TODO: These keys being giant strings is inefficient as hell.
                data.Add(new VerbsResponseMessage.VerbData(verb.GetText(userEntity, component),
                    $"{component.GetType()}:{verb.GetType()}",
                    vis == VerbVisibility.Visible));
            }

            //Get global verbs. Visible for all entities regardless of their components.
            foreach (var globalVerb in VerbUtility.GetGlobalVerbs(Assembly.GetExecutingAssembly()))
            {
                if (globalVerb.RequireInteractionRange && !VerbUtility.InVerbUseRange(userEntity, entity))
                    continue;
                if (VerbUtility.IsVerbInvisible(globalVerb, userEntity, entity, out var vis))
                    continue;

                data.Add(new VerbsResponseMessage.VerbData(globalVerb.GetText(userEntity, entity),
                    globalVerb.GetType().ToString(), vis == VerbVisibility.Visible));
            }

            var response = new VerbsResponseMessage(data, req.EntityUid);
            RaiseNetworkEvent(response, channel);
        }
    }
}