From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Toffikk <slodkitofik@gmail.com>
Date: Thu, 17 Jun 2021 01:00:29 +0200
Subject: [PATCH] Optimised halloween checker


diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 893a992156efb7b01b13efe9637704ac99c19baa..576969b5543c20a844a5db9eb742352c58ed34af 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1442,6 +1442,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         }
         // Paper end
 
+        org.yatopiamc.yatopia.server.util.entity.HalloweenChecker.tick(); // Yatopia
+
         // Paper start
         long endTime = System.nanoTime();
         long remaining = (TICK_TIME - (endTime - lastTick)) - catchupTime;
diff --git a/src/main/java/net/minecraft/world/entity/ambient/Bat.java b/src/main/java/net/minecraft/world/entity/ambient/Bat.java
index 153194d937d210e2e4fd8864e4a3c000f85d7e2e..8b62bc462257aa67ad49bac699a889966fc05bed 100644
--- a/src/main/java/net/minecraft/world/entity/ambient/Bat.java
+++ b/src/main/java/net/minecraft/world/entity/ambient/Bat.java
@@ -255,11 +255,16 @@ public class Bat extends AmbientCreature {
     }
 
     private static boolean isHalloween() {
+        // Yatopia start - optimised halloween checker
+        /*
         LocalDate localdate = LocalDate.now();
         int i = localdate.get(ChronoField.DAY_OF_MONTH);
         int j = localdate.get(ChronoField.MONTH_OF_YEAR);
 
         return j == 10 && i >= 20 || j == 11 && i <= 3;
+        */
+        return org.yatopiamc.yatopia.server.util.entity.HalloweenChecker.isHalloweenSeason();
+        // Yatopia end
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/entity/monster/AbstractSkeleton.java b/src/main/java/net/minecraft/world/entity/monster/AbstractSkeleton.java
index c54a37516ef1d8a76f7161917bf448127cd98603..65aa3d2bb10c9cf09f3d3a01b0088c6caaa569bd 100644
--- a/src/main/java/net/minecraft/world/entity/monster/AbstractSkeleton.java
+++ b/src/main/java/net/minecraft/world/entity/monster/AbstractSkeleton.java
@@ -156,11 +156,16 @@ public abstract class AbstractSkeleton extends Monster implements RangedAttackMo
         this.reassessWeaponGoal();
         this.setCanPickUpLoot(this.level.paperConfig.skeletonsAlwaysCanPickUpLoot || this.random.nextFloat() < 0.55F * difficulty.getSpecialMultiplier()); // Paper
         if (this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
+            // Yatopia start - optimised halloween checker
+            /*
             LocalDate localdate = LocalDate.now();
             int i = localdate.get(ChronoField.DAY_OF_MONTH);
             int j = localdate.get(ChronoField.MONTH_OF_YEAR);
 
             if (j == 10 && i == 31 && this.random.nextFloat() < 0.25F) {
+             */
+            if (org.yatopiamc.yatopia.server.util.entity.HalloweenChecker.isHalloweenDay() && this.random.nextFloat() < 0.25F) {
+                // Yatopia end
                 this.setItemSlot(EquipmentSlot.HEAD, new ItemStack(this.random.nextFloat() < 0.1F ? Blocks.JACK_O_LANTERN : Blocks.CARVED_PUMPKIN));
                 this.armorDropChances[EquipmentSlot.HEAD.getIndex()] = 0.0F;
             }
diff --git a/src/main/java/net/minecraft/world/entity/monster/Zombie.java b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
index bb3b932c57fd1e5b1517940c7602c7f4aeeaf17e..e57d06b6eb605de1d40edb6459f651203b8c8a06 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Zombie.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
@@ -534,11 +534,16 @@ public class Zombie extends Monster {
         }
 
         if (this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
+            // Yatopia start - optimised halloween checker
+            /*
             LocalDate localdate = LocalDate.now();
             int i = localdate.get(ChronoField.DAY_OF_MONTH);
             int j = localdate.get(ChronoField.MONTH_OF_YEAR);
 
             if (j == 10 && i == 31 && this.random.nextFloat() < 0.25F) {
+             */
+            if (org.yatopiamc.yatopia.server.util.entity.HalloweenChecker.isHalloweenDay() && this.random.nextFloat() < 0.25F) {
+                // Yatopia end
                 this.setItemSlot(EquipmentSlot.HEAD, new ItemStack(this.random.nextFloat() < 0.1F ? Blocks.JACK_O_LANTERN : Blocks.CARVED_PUMPKIN));
                 this.armorDropChances[EquipmentSlot.HEAD.getIndex()] = 0.0F;
             }
diff --git a/src/main/java/org/yatopiamc/yatopia/server/util/entity/HalloweenChecker.java b/src/main/java/org/yatopiamc/yatopia/server/util/entity/HalloweenChecker.java
new file mode 100644
index 0000000000000000000000000000000000000000..6e18c9b7bb738ac7d4f0da2fab265877f093b914
--- /dev/null
+++ b/src/main/java/org/yatopiamc/yatopia/server/util/entity/HalloweenChecker.java
@@ -0,0 +1,59 @@
+package org.yatopiamc.yatopia.server.util.entity;
+
+import java.time.LocalDate;
+import java.time.temporal.ChronoField;
+import net.minecraft.server.MinecraftServer;
+
+/**
+ * Entity halloween checker
+ * <p>
+ * Checks whether or not it is halloween at a specific rate rather than every time when
+ * a entity is being spawned.
+ * <p>
+ * The rate changes depending on how much TPS the server has. By default, the rate is every
+ * 2 hours, or every 144k ticks (if the server has _that_ much uptime)
+ *
+ * @author MrIvanPlays
+ */
+public class HalloweenChecker {
+
+    private static boolean halloweenSeason = false;
+    private static boolean halloweenDay = false;
+
+    private static int delay = (20 * 60 * 60) * 2;
+    private static int lastCheckTick = -delay;
+
+    public static void tick() {
+        if (MinecraftServer.currentTick % 100 == 0) {
+            // update the delay every 100 ticks
+            if (MinecraftServer.TPS >= 20) {
+                delay = (20 * 60 * 60) * 2;
+            }
+            if (MinecraftServer.TPS < 15) {
+                delay = delay + (20 * 60 * 15);
+            }
+            if (MinecraftServer.TPS < 10) {
+                delay = delay + (20 * 60 * 30);
+            }
+        }
+        if (MinecraftServer.currentTick - lastCheckTick > delay) {
+            LocalDate now = LocalDate.now();
+            int day = now.getDayOfMonth();
+            int month = now.get(ChronoField.MONTH_OF_YEAR);
+
+            halloweenDay = (month == 10) && (day == 31);
+            halloweenSeason = ((month == 10) && (day >= 20)) || ((month == 11) && (day <= 3));
+
+            lastCheckTick = MinecraftServer.currentTick;
+        }
+    }
+
+    public static boolean isHalloweenSeason() {
+        return halloweenSeason;
+    }
+
+    public static boolean isHalloweenDay() {
+        return halloweenDay;
+    }
+
+}