Adding new Cryogenics Reagent - Opporozidone (Attempt 2) (#24074)

* Fixing mistakes

* How did I make the same mistake twice

---------

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Content.Server/Atmos/Rotting/RottingSystem.cs

@@ -149,6 +149,29 @@ public sealed class RottingSystem : SharedRottingSystem
         args.Handled = component.CurrentTemperature < Atmospherics.T0C + 0.85f;
     }
 
+
+    public void ReduceAccumulator(EntityUid uid, TimeSpan time)
+    {
+        if (!TryComp<PerishableComponent>(uid, out var perishable))
+            return;
+
+        if (!TryComp<RottingComponent>(uid, out var rotting))
+        {
+            perishable.RotAccumulator -= time;
+            return;
+        }
+        var total = (rotting.TotalRotTime + perishable.RotAccumulator) - time;
+
+        if (total < perishable.RotAfter)
+        {
+            RemCompDeferred(uid, rotting);
+            perishable.RotAccumulator = total;
+        }
+
+        else
+            rotting.TotalRotTime = total - perishable.RotAfter;
+    }
+    
     /// <summary>
     /// Is anything speeding up the decay?
     /// e.g. buried in a grave

Content.Server/Chemistry/ReagentEffects/ReduceRotting.cs

@@ -0,0 +1,31 @@
+using Content.Shared.Chemistry.Reagent;
+using JetBrains.Annotations;
+using Robust.Shared.Prototypes;
+using Content.Server.Atmos.Rotting;
+
+namespace Content.Server.Chemistry.ReagentEffects
+{
+    /// <summary>
+    /// Reduces the rotting accumulator on the patient, making them revivable.
+    /// </summary>
+    [UsedImplicitly]
+    public sealed partial class ReduceRotting : ReagentEffect
+    {
+        [DataField("seconds")]
+        public double RottingAmount = 10;
+
+        protected override string? ReagentEffectGuidebookText(IPrototypeManager prototype, IEntitySystemManager entSys)
+            => Loc.GetString("reagent-effect-guidebook-reduce-rotting",
+                ("chance", Probability),
+                ("time", RottingAmount));
+        public override void Effect(ReagentEffectArgs args)
+        {
+            if (args.Scale != 1f)
+                return;
+
+            var rottingSys = args.EntityManager.EntitySysManager.GetEntitySystem<RottingSystem>();
+
+            rottingSys.ReduceAccumulator(args.SolutionEntity, TimeSpan.FromSeconds(RottingAmount));
+        }
+    }
+}