Electrocution. (#4958)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>

Content.Shared/Electrocution/ElectrocutedComponent.cs

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+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Electrocution
+{
+    [RegisterComponent]
+    public sealed class ElectrocutedComponent : Component
+    {
+        public override string Name => "Electrocuted";
+    }
+}

Content.Shared/Electrocution/ElectrocutionEvents.cs

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+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Electrocution
+{
+    public class ElectrocutionAttemptEvent : CancellableEntityEventArgs
+    {
+        public readonly EntityUid TargetUid;
+        public readonly EntityUid? SourceUid;
+        public float SiemensCoefficient = 1f;
+
+        public ElectrocutionAttemptEvent(EntityUid targetUid, EntityUid? sourceUid, float siemensCoefficient)
+        {
+            TargetUid = targetUid;
+            SourceUid = sourceUid;
+            SiemensCoefficient = siemensCoefficient;
+        }
+    }
+
+    public class ElectrocutedEvent : EntityEventArgs
+    {
+        public readonly EntityUid TargetUid;
+        public readonly EntityUid? SourceUid;
+        public readonly float SiemensCoefficient;
+
+        public ElectrocutedEvent(EntityUid targetUid, EntityUid? sourceUid, float siemensCoefficient)
+        {
+            TargetUid = targetUid;
+            SourceUid = sourceUid;
+            SiemensCoefficient = siemensCoefficient;
+        }
+    }
+}

Content.Shared/Electrocution/InsulatedComponent.cs

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+using System;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Shared.Electrocution
+{
+    [Friend(typeof(SharedElectrocutionSystem))]
+    [RegisterComponent, NetworkedComponent]
+    public class InsulatedComponent : Component
+    {
+        public override string Name => "Insulated";
+
+        /// <summary>
+        ///     Siemens coefficient. Zero means completely insulated.
+        /// </summary>
+        [DataField("coefficient")]
+        public float SiemensCoefficient { get; set; } = 0f;
+    }
+
+    // Technically, people could cheat and figure out which budget insulated gloves are gud and which ones are bad.
+    // We might want to rethink this a little bit.
+    [NetSerializable, Serializable]
+    public class InsulatedComponentState : ComponentState
+    {
+        public float SiemensCoefficient { get; private set; }
+
+        public InsulatedComponentState(float siemensCoefficient)
+        {
+            SiemensCoefficient = siemensCoefficient;
+        }
+    }
+}

Content.Shared/Electrocution/SharedElectrocutionSystem.cs

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+using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Electrocution
+{
+    public abstract class SharedElectrocutionSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<InsulatedComponent, ElectrocutionAttemptEvent>(OnInsulatedElectrocutionAttempt);
+            SubscribeLocalEvent<InsulatedComponent, ComponentGetState>(OnInsulatedGetState);
+            SubscribeLocalEvent<InsulatedComponent, ComponentHandleState>(OnInsulatedHandleState);
+        }
+
+        public void SetInsulatedSiemensCoefficient(EntityUid uid, float siemensCoefficient, InsulatedComponent? insulated = null)
+        {
+            if (!Resolve(uid, ref insulated))
+                return;
+
+            insulated.SiemensCoefficient = siemensCoefficient;
+            insulated.Dirty();
+        }
+
+        private void OnInsulatedElectrocutionAttempt(EntityUid uid, InsulatedComponent insulated, ElectrocutionAttemptEvent args)
+        {
+            args.SiemensCoefficient *= insulated.SiemensCoefficient;
+        }
+
+        private void OnInsulatedGetState(EntityUid uid, InsulatedComponent insulated, ref ComponentGetState args)
+        {
+            args.State = new InsulatedComponentState(insulated.SiemensCoefficient);
+        }
+
+        private void OnInsulatedHandleState(EntityUid uid, InsulatedComponent insulated, ref ComponentHandleState args)
+        {
+            if (args.Current is not InsulatedComponentState state)
+                return;
+
+            insulated.SiemensCoefficient = state.SiemensCoefficient;
+        }
+
+    }
+}