Watches (#29550)

* watches

* rename

* add it into loot pools

Content.Shared/Clock/SharedClockSystem.cs

@@ -0,0 +1,66 @@
+using System.Linq;
+using Content.Shared.Examine;
+using Content.Shared.GameTicking;
+
+namespace Content.Shared.Clock;
+
+public abstract class SharedClockSystem : EntitySystem
+{
+    [Dependency] private readonly SharedGameTicker _ticker = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<ClockComponent, ExaminedEvent>(OnExamined);
+    }
+
+    private void OnExamined(Entity<ClockComponent> ent, ref ExaminedEvent args)
+    {
+        if (!args.IsInDetailsRange)
+            return;
+
+        args.PushMarkup(Loc.GetString("clock-examine", ("time", GetClockTimeText(ent))));
+    }
+
+    public string GetClockTimeText(Entity<ClockComponent> ent)
+    {
+        var time = GetClockTime(ent);
+        switch (ent.Comp.ClockType)
+        {
+            case ClockType.TwelveHour:
+                return time.ToString(@"h\:mm");
+            case ClockType.TwentyFourHour:
+                return time.ToString(@"hh\:mm");
+            default:
+                throw new ArgumentOutOfRangeException();
+        }
+    }
+
+    private TimeSpan GetGlobalTime()
+    {
+        return (EntityQuery<GlobalTimeManagerComponent>().FirstOrDefault()?.TimeOffset ?? TimeSpan.Zero) + _ticker.RoundDuration();
+    }
+
+    public TimeSpan GetClockTime(Entity<ClockComponent> ent)
+    {
+        var comp = ent.Comp;
+
+        if (comp.StuckTime != null)
+            return comp.StuckTime.Value;
+
+        var time = GetGlobalTime();
+
+        switch (comp.ClockType)
+        {
+            case ClockType.TwelveHour:
+                var adjustedHours = time.Hours % 12;
+                if (adjustedHours == 0)
+                    adjustedHours = 12;
+                return new TimeSpan(adjustedHours, time.Minutes, time.Seconds);
+            case ClockType.TwentyFourHour:
+                return time;
+            default:
+                throw new ArgumentOutOfRangeException();
+        }
+    }
+}