Add utility AI (#806)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>
Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Server/AI/WorldState/States/Nutrition/ThirstyState.cs

@@ -0,0 +1,40 @@
+using System;
+using Content.Server.GameObjects.Components.Nutrition;
+using JetBrains.Annotations;
+using ThirstComponent = Content.Server.GameObjects.Components.Nutrition.ThirstComponent;
+
+namespace Content.Server.AI.WorldState.States.Nutrition
+{
+    [UsedImplicitly]
+    public class ThirstyState : StateData<bool>
+    {
+        public override string Name => "Thirsty";
+
+        public override bool GetValue()
+        {
+            if (!Owner.TryGetComponent(out ThirstComponent thirstComponent))
+            {
+                return false;
+            }
+
+            switch (thirstComponent.CurrentThirstThreshold)
+            {
+                case ThirstThreshold.OverHydrated:
+                    return false;
+                case ThirstThreshold.Okay:
+                    return false;
+                case ThirstThreshold.Thirsty:
+                    return true;
+                case ThirstThreshold.Parched:
+                    return true;
+                case ThirstThreshold.Dead:
+                    return true;
+                default:
+                    throw new ArgumentOutOfRangeException(
+                        nameof(thirstComponent.CurrentThirstThreshold),
+                        thirstComponent.CurrentThirstThreshold,
+                        null);
+            }
+        }
+    }
+}