Add emp grenade (#14393)

Content.Server/Emp/EmpOnTriggerComponent.cs

@@ -0,0 +1,17 @@
+namespace Content.Server.Emp;
+
+/// <summary>
+/// Upon being triggered will EMP area around it.
+/// </summary>
+[RegisterComponent]
+sealed class EmpOnTriggerComponent : Component
+{
+    [DataField("range"), ViewVariables(VVAccess.ReadWrite)]
+    public float Range = 1.0f;
+
+    /// <summary>
+    /// How much energy will be consumed per battery in range
+    /// </summary>
+    [DataField("energyConsumption"), ViewVariables(VVAccess.ReadWrite)]
+    public float EnergyConsumption;
+}

Content.Server/Emp/EmpSystem.cs

@@ -0,0 +1,39 @@
+using Content.Server.Explosion.EntitySystems;
+using Robust.Shared.Map;
+
+namespace Content.Server.Emp;
+
+public sealed class EmpSystem : EntitySystem
+{
+    [Dependency] private readonly EntityLookupSystem _lookup = default!;
+
+    public const string EmpPulseEffectPrototype = "EffectEmpPulse";
+    public const string EmpDisabledEffectPrototype = "EffectEmpDisabled";
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<EmpOnTriggerComponent, TriggerEvent>(HandleEmpTrigger);
+    }
+
+    public void EmpPulse(MapCoordinates coordinates, float range, float energyConsumption)
+    {
+        foreach (var uid in _lookup.GetEntitiesInRange(coordinates, range))
+        {
+            var ev = new EmpPulseEvent(energyConsumption, false);
+            RaiseLocalEvent(uid, ref ev);
+            if (ev.Affected)
+                Spawn(EmpDisabledEffectPrototype, Transform(uid).Coordinates);
+        }
+        Spawn(EmpPulseEffectPrototype, coordinates);
+    }
+
+    private void HandleEmpTrigger(EntityUid uid, EmpOnTriggerComponent comp, TriggerEvent args)
+    {
+        EmpPulse(Transform(uid).Coordinates.ToMap(EntityManager), comp.Range, comp.EnergyConsumption);
+        args.Handled = true;
+    }
+}
+
+[ByRefEvent]
+public record struct EmpPulseEvent(float EnergyConsumption, bool Affected);

Content.Server/Light/EntitySystems/PoweredLightSystem.cs

@@ -22,6 +22,7 @@ using Robust.Shared.Containers;
 using Robust.Shared.Player;
 using Robust.Shared.Timing;
 using Content.Shared.DoAfter;
+using Content.Server.Emp;
 
 namespace Content.Server.Light.EntitySystems
 {
@@ -63,6 +64,8 @@ namespace Content.Server.Light.EntitySystems
             SubscribeLocalEvent<PoweredLightComponent, PowerChangedEvent>(OnPowerChanged);
 
             SubscribeLocalEvent<PoweredLightComponent, DoAfterEvent>(OnDoAfter);
+
+            SubscribeLocalEvent<PoweredLightComponent, EmpPulseEvent>(OnEmpPulse);
         }
 
         private void OnInit(EntityUid uid, PoweredLightComponent light, ComponentInit args)
@@ -421,5 +424,11 @@ namespace Content.Server.Light.EntitySystems
 
             args.Handled = true;
         }
+
+        private void OnEmpPulse(EntityUid uid, PoweredLightComponent component, ref EmpPulseEvent args)
+        {
+            args.Affected = true;
+            TryDestroyBulb(uid, component);  
+        }
     }
 }

Content.Server/Power/EntitySystems/ApcSystem.cs

@@ -1,3 +1,4 @@
+using Content.Server.Emp;
 using Content.Server.Popups;
 using Content.Server.Power.Components;
 using Content.Shared.Access.Components;
@@ -44,6 +45,8 @@ namespace Content.Server.Power.EntitySystems
             SubscribeLocalEvent<ApcToolFinishedEvent>(OnToolFinished);
             SubscribeLocalEvent<ApcComponent, InteractUsingEvent>(OnInteractUsing);
             SubscribeLocalEvent<ApcComponent, ExaminedEvent>(OnExamine);
+
+            SubscribeLocalEvent<ApcComponent, EmpPulseEvent>(OnEmpPulse);
         }
 
         // Change the APC's state only when the battery state changes, or when it's first created.
@@ -247,5 +250,14 @@ namespace Content.Server.Power.EntitySystems
                 ? "apc-component-on-examine-panel-open"
                 : "apc-component-on-examine-panel-closed"));
         }
+
+        private void OnEmpPulse(EntityUid uid, ApcComponent component, ref EmpPulseEvent args)
+        {
+            if (component.MainBreakerEnabled)
+            {
+                args.Affected = true;
+                ApcToggleBreaker(uid, component);
+            }
+        }
     }
 }

Content.Server/Power/EntitySystems/BatterySystem.cs

@@ -1,4 +1,5 @@
 using Content.Server.Cargo.Systems;
+using Content.Server.Emp;
 using Content.Server.Power.Components;
 using Content.Shared.Examine;
 using Content.Shared.Rejuvenate;
@@ -17,6 +18,7 @@ namespace Content.Server.Power.EntitySystems
             SubscribeLocalEvent<PowerNetworkBatteryComponent, RejuvenateEvent>(OnNetBatteryRejuvenate);
             SubscribeLocalEvent<BatteryComponent, RejuvenateEvent>(OnBatteryRejuvenate);
             SubscribeLocalEvent<BatteryComponent, PriceCalculationEvent>(CalculateBatteryPrice);
+            SubscribeLocalEvent<BatteryComponent, EmpPulseEvent>(OnEmpPulse);
 
             SubscribeLocalEvent<NetworkBatteryPreSync>(PreSync);
             SubscribeLocalEvent<NetworkBatteryPostSync>(PostSync);
@@ -87,5 +89,11 @@ namespace Content.Server.Power.EntitySystems
         {
             args.Price += component.CurrentCharge * component.PricePerJoule;
         }
+
+        private void OnEmpPulse(EntityUid uid, BatteryComponent component, ref EmpPulseEvent args)
+        {
+            args.Affected = true;
+            component.UseCharge(args.EnergyConsumption);   
+        }
     }
 }