Emags (#6738)

Content.Shared/Emag/Systems/SharedEmagSystem.cs

@@ -0,0 +1,65 @@
+using Content.Shared.Emag.Components;
+using Content.Shared.Interaction;
+using Content.Shared.Examine;
+using Content.Shared.Popups;
+using Content.Shared.Administration.Logs;
+using Content.Shared.Database;
+using Robust.Shared.Player;
+
+namespace Content.Shared.Emag.Systems
+{
+    /// How to add an emag interaction:
+    /// 1. Go to the system for the component you want the interaction with
+    /// 2. Subscribe to the GotEmaggedEvent
+    /// 3. Have some check for if this actually needs to be emagged or is already emagged (to stop charge waste)
+    /// 4. Past the check, add all the effects you desire and HANDLE THE EVENT ARGUMENT so a charge is spent
+    public sealed class SharedEmagSystem : EntitySystem
+    {
+        [Dependency] private readonly SharedPopupSystem _popupSystem = default!;
+        [Dependency] private readonly SharedAdminLogSystem _adminLog = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<EmagComponent, AfterInteractEvent>(OnAfterInteract);
+            SubscribeLocalEvent<EmagComponent, ExaminedEvent>(OnExamine);
+        }
+
+        private void OnExamine(EntityUid uid, EmagComponent component, ExaminedEvent args)
+        {
+            args.PushMarkup(Loc.GetString("emag-charges-remaining", ("charges", component.Charges)));
+        }
+
+        private void OnAfterInteract(EntityUid uid, EmagComponent component, AfterInteractEvent args)
+        {
+            if (!args.CanReach || args.Target == null)
+                return;
+
+            if (component.Charges <= 0)
+            {
+                _popupSystem.PopupEntity(Loc.GetString("emag-no-charges"), args.User, Filter.Entities(args.User));
+                return;
+            }
+
+            var emaggedEvent = new GotEmaggedEvent(args.User);
+            RaiseLocalEvent(args.Target.Value, emaggedEvent, false);
+            if (emaggedEvent.Handled)
+            {
+                _popupSystem.PopupEntity(Loc.GetString("emag-success",("target", args.Target)), args.User, Filter.Entities(args.User));
+                _adminLog.Add(LogType.Emag, LogImpact.High, $"{ToPrettyString(args.User):player} emagged {ToPrettyString(args.Target.Value):target}");
+                component.Charges--;
+                return;
+            }
+        }
+    }
+
+    public sealed class GotEmaggedEvent : HandledEntityEventArgs
+    {
+        public readonly EntityUid UserUid;
+
+        public GotEmaggedEvent(EntityUid userUid)
+        {
+            userUid = UserUid;
+        }
+    }
+}