refactor: rework the new status effect system to use containers (#38915) (#38943)

Co-authored-by: Perry Fraser <perryprog@users.noreply.github.com>

Content.Shared/StatusEffectNew/StatusEffectAlertSystem.cs

@@ -0,0 +1,62 @@
+using Content.Shared.Alert;
+using Content.Shared.StatusEffectNew.Components;
+using Robust.Shared.Timing;
+
+namespace Content.Shared.StatusEffectNew;
+
+/// <summary>
+/// Handles displaying status effects that should show an alert, optionally with a duration.
+/// </summary>
+public sealed class StatusEffectAlertSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly AlertsSystem _alerts = default!;
+
+    private EntityQuery<StatusEffectComponent> _effectQuery;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<StatusEffectAlertComponent, StatusEffectAppliedEvent>(OnStatusEffectApplied);
+        SubscribeLocalEvent<StatusEffectAlertComponent, StatusEffectRemovedEvent>(OnStatusEffectRemoved);
+        SubscribeLocalEvent<StatusEffectAlertComponent, StatusEffectEndTimeUpdatedEvent>(OnEndTimeUpdated);
+
+        _effectQuery = GetEntityQuery<StatusEffectComponent>();
+    }
+
+    private void OnStatusEffectApplied(Entity<StatusEffectAlertComponent> ent, ref StatusEffectAppliedEvent args)
+    {
+        if (!_effectQuery.TryComp(ent, out var effectComp))
+            return;
+
+        RefreshAlert(ent, args.Target, effectComp.EndEffectTime);
+    }
+
+    private void OnStatusEffectRemoved(Entity<StatusEffectAlertComponent> ent, ref StatusEffectRemovedEvent args)
+    {
+        _alerts.ClearAlert(args.Target, ent.Comp.Alert);
+    }
+
+    private void OnEndTimeUpdated(Entity<StatusEffectAlertComponent> ent, ref StatusEffectEndTimeUpdatedEvent args)
+    {
+        RefreshAlert(ent, args.Target, args.EndTime);
+    }
+
+    private void RefreshAlert(Entity<StatusEffectAlertComponent> ent, EntityUid target, TimeSpan? endTime)
+    {
+        (TimeSpan Start, TimeSpan End)? cooldown = null;
+
+        // Make sure the start time of the alert cooldown is still accurate
+        // This ensures the progress wheel doesn't "reset" every duration change.
+        if (ent.Comp.ShowDuration
+            && endTime is not null
+            && _alerts.TryGet(ent.Comp.Alert, out var alert))
+        {
+            _alerts.TryGetAlertState(target, alert.AlertKey, out var alertState);
+            cooldown = (alertState.Cooldown?.Item1 ?? _timing.CurTime, endTime.Value);
+        }
+
+        _alerts.ShowAlert(target, ent.Comp.Alert, cooldown: cooldown);
+    }
+}