The Rat King [Antag] (#8706)

* vending machine go spit

* who's da rat, bozo

* fixes

* crown + fixes

* aaaa

* aa

* lololol

* removing vending shit + most annoying fix alive

* paul review

* moony fixes

* sloth review

* Minor diseasesystem fix

* inverse moment

* A

* Also reduce args allocations

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/RatKing/RatKingSystem.cs

@@ -0,0 +1,93 @@
+using Content.Server.Actions;
+using Content.Server.Disease;
+using Content.Server.Disease.Components;
+using Content.Server.Nutrition.Components;
+using Content.Server.Popups;
+using Content.Shared.Actions;
+using Robust.Shared.Player;
+
+namespace Content.Server.RatKing
+{
+    public sealed class RatKingSystem : EntitySystem
+    {
+        [Dependency] private readonly PopupSystem _popup = default!;
+        [Dependency] private readonly ActionsSystem _action = default!;
+        [Dependency] private readonly DiseaseSystem _disease = default!;
+        [Dependency] private readonly EntityLookupSystem _lookup = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<RatKingComponent, ComponentStartup>(OnStartup);
+
+            SubscribeLocalEvent<RatKingComponent, RatKingRaiseArmyActionEvent>(OnRaiseArmy);
+            SubscribeLocalEvent<RatKingComponent, RatKingDomainActionEvent>(OnDomain);
+        }
+
+        private void OnStartup(EntityUid uid, RatKingComponent component, ComponentStartup args)
+        {
+            _action.AddAction(uid, component.ActionRaiseArmy, null);
+            _action.AddAction(uid, component.ActionDomain, null);
+        }
+
+        /// <summary>
+        /// Summons an allied rat servant at the King, costing a small amount of hunger
+        /// </summary>
+        private void OnRaiseArmy(EntityUid uid, RatKingComponent component, RatKingRaiseArmyActionEvent args)
+        {
+            if (args.Handled)
+                return;
+
+            if (!TryComp<HungerComponent>(uid, out var hunger))
+                return;
+
+            //make sure the hunger doesn't go into the negatives
+            if (hunger.CurrentHunger < component.HungerPerArmyUse)
+            {
+                _popup.PopupEntity(Loc.GetString("rat-king-too-hungry"), uid, Filter.Entities(uid));
+                return;
+            }
+            args.Handled = true;
+            hunger.CurrentHunger -= component.HungerPerArmyUse;
+            Spawn(component.ArmyMobSpawnId, Transform(uid).Coordinates); //spawn the little mouse boi
+        }
+
+        /// <summary>
+        /// Gets all of the nearby disease-carrying entities in a radius
+        /// and gives them the specified disease. It has a hunger cost as well
+        /// </summary>
+        private void OnDomain(EntityUid uid, RatKingComponent component, RatKingDomainActionEvent args)
+        {
+            if (args.Handled)
+                return;
+
+            if (!TryComp<HungerComponent>(uid, out var hunger))
+                return;
+
+            //make sure the hunger doesn't go into the negatives
+            if (hunger.CurrentHunger < component.HungerPerDomainUse)
+            {
+                _popup.PopupEntity(Loc.GetString("rat-king-too-hungry"), uid, Filter.Entities(uid));
+                return;
+            }
+            args.Handled = true;
+            hunger.CurrentHunger -= component.HungerPerDomainUse;
+
+            _popup.PopupEntity(Loc.GetString("rat-king-domain-popup"), uid, Filter.Pvs(uid, default, EntityManager));
+
+            var tstalker = GetEntityQuery<DiseaseCarrierComponent>();
+            foreach (var entity in _lookup.GetEntitiesInRange(uid, component.DomainRange)) //go through all of them, filtering only those in range that are not the king itself
+            {
+                if (entity == uid)
+                    continue;
+
+                if (tstalker.TryGetComponent(entity, out var diseasecomp))
+                    _disease.TryInfect(diseasecomp, component.DomainDiseaseId); //infect them with w/e disease
+            }
+        }
+    }
+
+    public sealed class RatKingRaiseArmyActionEvent : InstantActionEvent { };
+    public sealed class RatKingDomainActionEvent : InstantActionEvent { };
+};