Xenoarchaeology artifacts (#6069)

Co-authored-by: Alexander Evgrashin <evgrashin.adl@gmail.com>

Content.Server/Xenoarchaeology/XenoArtifacts/ArtifactSystem.cs

@@ -0,0 +1,70 @@
+using Content.Server.Xenoarchaeology.XenoArtifacts.Events;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Random;
+using Robust.Shared.Timing;
+
+namespace Content.Server.Xenoarchaeology.XenoArtifacts;
+
+public class ArtifactSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _gameTiming = default!;
+    [Dependency] private readonly IRobustRandom _random = default!;
+    [Dependency] private readonly IComponentFactory _componentFactory = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<ArtifactComponent, ComponentInit>(OnInit);
+    }
+
+    private void OnInit(EntityUid uid, ArtifactComponent component, ComponentInit args)
+    {
+        if (component.RandomTrigger)
+        {
+            AddRandomTrigger(uid, component);
+        }
+    }
+
+    public void AddRandomTrigger(EntityUid uid, ArtifactComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        var triggerName = _random.Pick(component.PossibleTriggers);
+        var trigger = (Component) _componentFactory.GetComponent(triggerName);
+        trigger.Owner = uid;
+
+        EntityManager.AddComponent(uid, trigger);
+    }
+
+    public bool TryActivateArtifact(EntityUid uid, EntityUid? user = null,
+        ArtifactComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return false;
+
+        // check if artifact isn't under cooldown
+        var timeDif = _gameTiming.CurTime - component.LastActivationTime;
+        if (timeDif.TotalSeconds < component.CooldownTime)
+            return false;
+
+        ForceActivateArtifact(uid, user, component);
+        return true;
+    }
+
+    public void ForceActivateArtifact(EntityUid uid, EntityUid? user = null,
+        ArtifactComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        component.LastActivationTime = _gameTiming.CurTime;
+
+        var ev = new ArtifactActivatedEvent()
+        {
+            Activator = user
+        };
+        RaiseLocalEvent(uid, ev);
+    }
+}