ninja 2 electric boogaloo (#15534)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Research/Systems/SharedResearchStealerSystem.cs

@@ -0,0 +1,63 @@
+using Content.Shared.DoAfter;
+using Content.Shared.Interaction;
+using Content.Shared.Ninja.Systems;
+using Content.Shared.Popups;
+using Content.Shared.Research.Components;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Research.Systems;
+
+public abstract class SharedResearchStealerSystem : EntitySystem
+{
+    [Dependency] private readonly SharedDoAfterSystem _doAfter = default!;
+    [Dependency] private readonly SharedNinjaGlovesSystem _gloves = default!;
+    [Dependency] private readonly SharedPopupSystem _popup = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<ResearchStealerComponent, BeforeInteractHandEvent>(OnBeforeInteractHand);
+    }
+
+    /// <summary>
+    /// Start do after for downloading techs from a r&d server.
+    /// Will only try if there is at least 1 tech researched.
+    /// </summary>
+    private void OnBeforeInteractHand(EntityUid uid, ResearchStealerComponent comp, BeforeInteractHandEvent args)
+    {
+        // TODO: generic event
+        if (args.Handled || !_gloves.AbilityCheck(uid, args, out var target))
+            return;
+
+        // can only hack the server, not a random console
+        if (!TryComp<TechnologyDatabaseComponent>(target, out var database) || HasComp<ResearchClientComponent>(target))
+            return;
+
+        args.Handled = true;
+
+        // fail fast if theres no techs to steal right now
+        if (database.UnlockedTechnologies.Count == 0)
+        {
+            _popup.PopupClient(Loc.GetString("ninja-download-fail"), uid, uid);
+            return;
+        }
+
+        var doAfterArgs = new DoAfterArgs(uid, comp.Delay, new ResearchStealDoAfterEvent(), target: target, used: uid, eventTarget: uid)
+        {
+            BreakOnDamage = true,
+            BreakOnUserMove = true,
+            MovementThreshold = 0.5f
+        };
+
+        _doAfter.TryStartDoAfter(doAfterArgs);
+    }
+}
+
+/// <summary>
+/// Raised on the research stealer when the doafter completes.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed partial class ResearchStealDoAfterEvent : SimpleDoAfterEvent
+{
+}