The Rat King [Antag]

Content.Server/Disease/Components/DiseaseCarrierComponent.cs

@@ -1,36 +1,48 @@
 using System.Linq;
 using Content.Shared.Disease;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Set;
 
 namespace Content.Server.Disease.Components
 {
-    [RegisterComponent]
     /// <summary>
-    /// Allows the enity to be infected with diseases.
+    /// Allows the entity to be infected with diseases.
     /// Please use only on mobs.
     /// </summary>
+    [RegisterComponent]
     public sealed class DiseaseCarrierComponent : Component
     {
         /// <summary>
         /// Shows the CURRENT diseases on the carrier
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
         public List<DiseasePrototype> Diseases = new();
+
         /// <summary>
         /// The carrier's resistance to disease
         /// </summary>
         [DataField("diseaseResist")]
         [ViewVariables(VVAccess.ReadWrite)]
         public float DiseaseResist = 0f;
+
         /// <summary>
         /// Diseases the carrier has had, used for immunity.
-        /// <summary>
+        /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
         public List<DiseasePrototype> PastDiseases = new();
+
         /// <summary>
         /// All the diseases the carrier has or has had.
         /// Checked against when trying to add a disease
-        /// <summary>
+        /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
         public List<DiseasePrototype> AllDiseases => PastDiseases.Concat(Diseases).ToList();
+
+        /// <summary>
+        /// A list of diseases which the entity does not
+        /// exhibit direct symptoms from. They still transmit
+        /// these diseases, just without symptoms.
+        /// </summary>
+        [ViewVariables, DataField("carrierDiseases", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<DiseasePrototype>))]
+        public HashSet<string>? CarrierDiseases;
     }
 }

Content.Server/Disease/DiseaseSystem.cs

@@ -96,17 +96,23 @@ public override void Update(float frameTime)
                 for (var i = 0; i < carrierComp.Diseases.Count; i++) //this is a for-loop so that it doesn't break when new diseases are added
                 {
                     var disease = carrierComp.Diseases[i];
+                    disease.Accumulator += frameTime;
+
+                    if (disease.Accumulator < disease.TickTime) continue;
 
+                    // if the disease is on the silent disease list, don't do effects
+                    var doEffects = carrierComp.CarrierDiseases?.Contains(disease.ID) != true;
                     var args = new DiseaseEffectArgs(carrierComp.Owner, disease, EntityManager);
-                    disease.Accumulator += frameTime;
-                    if (disease.Accumulator >= disease.TickTime)
+                    disease.Accumulator -= disease.TickTime;
+
+                    foreach (var cure in disease.Cures)
+                    {
+                        if (cure.Cure(args))
+                            CureDisease(carrierComp, disease);
+                    }
+
+                    if (doEffects)
                     {
-                        disease.Accumulator -= disease.TickTime;
-                        foreach (var cure in disease.Cures)
-                        {
-                            if (cure.Cure(args))
-                                CureDisease(carrierComp, disease);
-                        }
                         foreach (var effect in disease.Effects)
                         {
                             if (_random.Prob(effect.Probability))
@@ -383,6 +389,14 @@ public void TryInfect(DiseaseCarrierComponent carrier, DiseasePrototype? disease
                 TryAddDisease(carrier.Owner, disease, carrier);
         }
 
+        public void TryInfect(DiseaseCarrierComponent carrier, string? disease, float chance = 0.7f, bool forced = false)
+        {
+            if (disease == null || !_prototypeManager.TryIndex<DiseasePrototype>(disease, out var d))
+                return;
+
+            TryInfect(carrier, d, chance, forced);
+        }
+
         /// <summary>
         /// Plays a sneeze/cough popup if applicable
         /// and then tries to infect anyone in range

Content.Server/RatKing/RatKingComponent.cs

@@ -0,0 +1,54 @@
+using Content.Shared.Actions.ActionTypes;
+using Content.Shared.Disease;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Server.RatKing
+{
+    [RegisterComponent]
+    public sealed class RatKingComponent : Component
+    {
+        /// <summary>
+        ///     The action for the Raise Army ability
+        /// </summary>
+        [DataField("actionRaiseArmy", required: true)]
+        public InstantAction ActionRaiseArmy = new();
+
+        /// <summary>
+        ///     The amount of hunger one use of Raise Army consumes
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite), DataField("hungerPerArmyUse", required: true)]
+        public float HungerPerArmyUse = 25f;
+
+        /// <summary>
+        ///     The entity prototype of the mob that Raise Army summons
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite), DataField("armyMobSpawnId", customTypeSerializer: typeof(PrototypeIdSerializer<EntityPrototype>))]
+        public string ArmyMobSpawnId = "MobRatServant";
+
+        /// <summary>
+        ///     The action for the Domain ability
+        /// </summary>
+        [ViewVariables, DataField("actionDomain", required: true)]
+        public InstantAction ActionDomain = new();
+
+        /// <summary>
+        ///     The amount of hunger one use of Domain consumes
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite), DataField("hungerPerDomainUse", required: true)]
+        public float HungerPerDomainUse = 50f;
+
+        /// <summary>
+        ///     The disease prototype id that the Domain ability spreads
+        /// </summary>
+        [ViewVariables, DataField("domainDiseaseId", customTypeSerializer: typeof(PrototypeIdSerializer<DiseasePrototype>))]
+        public string DomainDiseaseId = "Plague";
+
+        /// <summary>
+        ///     The range of the Domain ability.
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite), DataField("domainRange")]
+        public float DomainRange = 3f;
+
+    }
+};

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 { };
+};

Content.Server/StationEvents/Events/MouseMigration.cs

@@ -0,0 +1,50 @@
+using System.Linq;
+using Content.Server.StationEvents.Components;
+using Robust.Shared.Random;
+
+namespace Content.Server.StationEvents.Events;
+
+public sealed class MouseMigration : StationEvent
+{
+    [Dependency] private readonly IRobustRandom _random = default!;
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+
+    public static List<string> SpawnedPrototypeChoices = new List<string>() //we double up for that ez fake probability
+        {"MobMouse", "MobMouse1", "MobMouse2", "MobRatServant"};
+
+    public override string Name => "MouseMigration";
+
+    public override string? StartAnnouncement =>
+        Loc.GetString("station-event-mouse-migration-announcement");
+
+    public override int EarliestStart => 30;
+
+    public override int MinimumPlayers => 35; //this just ensures that it doesn't spawn on lowpop maps. 
+
+    public override float Weight => WeightLow;
+
+    public override int? MaxOccurrences => 1;
+
+    protected override float StartAfter => 30f;
+
+    protected override float EndAfter => 60;
+
+    public override void Startup()
+    {
+        base.Startup();
+
+        var spawnLocations = _entityManager.EntityQuery<VentCritterSpawnLocationComponent, TransformComponent>().ToList();
+        _random.Shuffle(spawnLocations);
+
+        var spawnAmount = _random.Next(7, 15); // A small colony of critters.
+
+        for (int i = 0; i < spawnAmount && i < spawnLocations.Count - 1; i++)
+        {
+            var spawnChoice = _random.Pick(SpawnedPrototypeChoices);
+            if (_random.Prob(0.01f) || i == 0) //small chance for multiple, but always at least 1
+                spawnChoice = "MobRatKing";
+
+            _entityManager.SpawnEntity(spawnChoice, spawnLocations[i].Item2.Coordinates);
+        }
+    }
+}

Resources/Locale/en-US/animals/rat-king/rat-king.ftl

@@ -0,0 +1,8 @@
+rat-king-raise-army-name = Raise Army
+rat-king-raise-army-description = Spend some hunger to summon an allied rat to help defend you.
+
+rat-king-domain-name = Rat King's Domain
+rat-king-domain-description = Spend some hunger to infect those around you with the plague.
+rat-king-domain-popup = A cloud of plague is released into the air!
+
+rat-king-too-hungry = You are too hungry to use this ability!

Resources/Locale/en-US/station-events/events/mouse-migration.ftl

@@ -0,0 +1 @@
+station-event-mouse-migration-announcement = We have detected an oncoming migration of rodents to the station. Please stay out of maintenance tunnels and try and avoid excessive contact.

Resources/Prototypes/Diseases/infectious.yml

@@ -168,6 +168,31 @@
     - !type:DiseaseReagentCure
       reagent: DemonsBlood
 
+- type: disease
+  id: Plague
+  name: plague
+  cureResist: 0.1
+  effects:
+    - !type:DiseaseVomit
+      probability: 0.005
+    - !type:DiseasePopUp
+      probability: 0.025
+    - !type:DiseaseSnough
+      probability: 0.025
+      snoughMessage: disease-cough
+      snoughSound:
+        collection: Coughs
+    - !type:DiseaseHealthChange
+      probability: 0.05
+      damage:
+        types:
+          Poison: 2
+  cures:
+    - !type:DiseaseBedrestCure
+      maxLength: 120
+    - !type:DiseaseJustWaitCure
+      maxLength: 240
+
 - type: disease
   id: OwOnavirus
   name: OwOnavirus

Resources/Prototypes/Entities/Clothing/Head/misc.yml

@@ -112,6 +112,19 @@
   - type: Clothing
     sprite: Clothing/Head/Misc/cone.rsi
 
+- type: entity
+  parent: ClothingHeadBase
+  id: ClothingHeadHatFancyCrown
+  name: fancy crown
+  description: It smells like dead rat.
+  components:
+  - type: Sprite
+    sprite: Clothing/Head/Misc/fancycrown.rsi
+  - type: Clothing
+    sprite: Clothing/Head/Misc/fancycrown.rsi
+  - type: MobPrice
+    price: 3000
+
 - type: entity
   parent: ClothingHeadBase
   id: ClothingHeadHatCatEars