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/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);
+        }
+    }
+}