Telecrystals (and a bit more ECS) (#4775)

Content.Server/Traitor/Uplink/Telecrystal/TelecrystalSystem.cs

@@ -0,0 +1,55 @@
+using Content.Server.Traitor.Uplink.Account;
+using Content.Server.Traitor.Uplink.Components;
+using Content.Shared.Interaction;
+using Content.Shared.Popups;
+using Content.Shared.Stacks;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+using System;
+
+namespace Content.Server.Traitor.Uplink.Telecrystal
+{
+    public class TelecrystalSystem : EntitySystem
+    {
+        [Dependency]
+        private readonly UplinkAccountsSystem _accounts = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<TelecrystalComponent, AfterInteractEvent>(OnAfterInteract);
+        }
+
+        private void OnAfterInteract(EntityUid uid, TelecrystalComponent component, AfterInteractEvent args)
+        {
+            if (args.Handled)
+                return;
+
+            if (args.Target == null || !EntityManager.TryGetComponent(args.Target.Uid, out UplinkComponent? uplink))
+                return;
+
+            // TODO: when uplink will have some auth logic (like PDA ringtone code)
+            // check if uplink open before adding TC
+            // No metagaming by using this on every PDA around just to see if it gets used up.
+
+            var acc = uplink.UplinkAccount;
+            if (acc == null)
+                return;
+
+            EntityManager.TryGetComponent(uid, out SharedStackComponent? stack);
+
+            var tcCount = stack != null ? stack.Count : 1;
+            if (!_accounts.AddToBalance(acc, tcCount))
+                return;
+
+            EntityManager.DeleteEntity(uid);
+
+            var msg = Loc.GetString("telecrystal-component-sucs-inserted",
+                ("source", args.Used), ("target", args.Target));
+            args.User.PopupMessage(args.User, msg);
+
+            args.Handled = true;
+        }
+    }
+}