Operations That Cannot Fail Should Use Lowest Quality Medicine

Source/Pharmacist/HarmonyPatches/WorkGiver_DoBill_AddEveryMedicineToRelevantThings.cs

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+// WorkGiver_DoBill_GetMedicalCareCategory.cs
+// Copyright Karel Kroeze, 2018-2018
+
+using HarmonyLib;
+using RimWorld;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using Verse;
+using Verse.AI;
+
+namespace Pharmacist.Properties
+{
+    [HarmonyPatch(typeof(WorkGiver_DoBill), "AddEveryMedicineToRelevantThings")]
+    public static class WorkGiver_DoBill_AddEveryMedicineToRelevantThings
+    {
+        public static bool Prefix(Pawn pawn, Thing billGiver, List<Thing> relevantThings, Predicate<Thing> baseValidator, Map map)
+        {
+            Pawn patient = billGiver as Pawn;
+            //MedicalCareCategory medicalCareCategory = GetMedicalCareCategory(billGiver);
+            MedicalCareCategory medicalCareCategory = PharmacistUtility.TendAdvice(patient, InjurySeverity.Operation);
+            List<Thing> list = map.listerThings.ThingsInGroup(ThingRequestGroup.Medicine);
+            List<Thing> tmpMedicine = (List<Thing>)(typeof(WorkGiver_DoBill).GetField("tmpMedicine", BindingFlags.NonPublic | BindingFlags.Static).GetValue(null));
+            tmpMedicine.Clear();
+            for (int i = 0; i < list.Count; i++)
+            {
+                Thing thing = list[i];
+                if (medicalCareCategory.AllowsMedicine(thing.def) && baseValidator(thing) && pawn.CanReach(thing, PathEndMode.OnCell, Danger.Deadly))
+                {
+                    tmpMedicine.Add(thing);
+                }
+            }
+            float inverter = 1f;
+            if (patient.BillStack.FirstShouldDoNow.recipe.defName == "Anesthetize") { inverter = -1f; }
+            tmpMedicine.SortBy((Thing x) => 0f - (x.GetStatValue(StatDefOf.MedicalPotency) * inverter), (Thing x) => x.Position.DistanceToSquared(billGiver.Position));
+            relevantThings.AddRange(tmpMedicine);
+            tmpMedicine.Clear();
+            return false;
+        }
+    }
+}