Paper/patches/server-remapped/0621-added-PlayerTradeEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 2 Jul 2020 16:12:10 -0700
Subject: [PATCH] added PlayerTradeEvent


diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index 40ab66f888f30a5506e3aa96a4b32485452e8978..87dd6c012bf1ca6a1e8df44dc0957c4c67d02adc 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -91,7 +91,7 @@ import org.bukkit.event.entity.EntityUnleashEvent.UnleashReason;
 public abstract class Mob extends LivingEntity {
 
     private static final EntityDataAccessor<Byte> DATA_MOB_FLAGS_ID = SynchedEntityData.defineId(Mob.class, EntityDataSerializers.BYTE);
-    public int ambientSoundTime;
+    public int ambientSoundTime;public void setAmbientSoundTime(int time) { this.ambientSoundTime = time; } // Paper - OBFHELPER
     protected int xpReward;
     protected LookControl lookControl;
     protected MoveControl moveControl;
@@ -293,6 +293,7 @@ public abstract class Mob extends LivingEntity {
         this.entityData.define(Mob.DATA_MOB_FLAGS_ID, (byte) 0);
     }
 
+    public int getAmbientSoundInterval() { return getAmbientSoundInterval(); } // Paper - OBFHELPER
     public int getAmbientSoundInterval() {
         return 80;
     }
diff --git a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
index 335000713279b7964c5172937483678c671bfed1..d31b773f8aff09c9f214662aa3aa0c904119e12c 100644
--- a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
@@ -37,6 +37,9 @@ import org.bukkit.craftbukkit.inventory.CraftMerchant;
 import org.bukkit.craftbukkit.inventory.CraftMerchantRecipe;
 import org.bukkit.event.entity.VillagerAcquireTradeEvent;
 // CraftBukkit end
+// Paper start
+import io.papermc.paper.event.player.PlayerTradeEvent;
+// Paper end
 
 public abstract class AbstractVillager extends AgableMob implements Npc, Merchant {
 
@@ -133,16 +136,27 @@ public abstract class AbstractVillager extends AgableMob implements Npc, Merchan
 
     @Override
     public void notifyTrade(MerchantOffer offer) {
-        offer.increaseUses();
-        this.ambientSoundTime = -this.getAmbientSoundInterval();
-        this.rewardTradeXp(offer);
+        // Paper - moved down
+        // Paper start
         if (this.tradingPlayer instanceof ServerPlayer) {
-            CriteriaTriggers.TRADE.trigger((ServerPlayer) this.tradingPlayer, this, offer.getResult());
+            PlayerTradeEvent event = new PlayerTradeEvent(((ServerPlayer) this.tradingPlayer).getBukkitEntity(), (org.bukkit.entity.AbstractVillager) this.getBukkitEntity(), offer.asBukkit(), true, true);
+            event.callEvent();
+            if (!event.isCancelled()) {
+                MerchantOffer recipe = CraftMerchantRecipe.fromBukkit(event.getTrade()).toMinecraft();
+                if (event.willIncreaseTradeUses()) recipe.increaseUses();
+                this.setAmbientSoundTime(-getAmbientSoundInterval());
+                if (event.isRewardingExp()) this.rewardTradeXp(recipe);
+                CriteriaTriggers.TRADE.trigger((ServerPlayer) this.tradingPlayer, this, recipe.getResult());
+            }
+        } else {
+            offer.increaseUses();
+            this.setAmbientSoundTime(-getAmbientSoundInterval());
+            this.rewardTradeXp(offer);
         }
-
+        // Paper end
     }
 
-    protected abstract void rewardTradeXp(MerchantOffer offer);
+    protected abstract void rewardTradeXp(MerchantOffer offer); public void rewardTradeXp(MerchantOffer merchantrecipe) { this.rewardTradeXp(merchantrecipe); } // Paper - OBFHELPER
 
     @Override
     public boolean showProgressBar() {