Paper/patches/server-unmapped/0619-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/EntityInsentient.java b/src/main/java/net/minecraft/world/entity/EntityInsentient.java
index da190d0b21098e327fab42e79a4ae18629bcf6e5..969e5fa3080a98850f03ba64c5662c32a8d501a6 100644
--- a/src/main/java/net/minecraft/world/entity/EntityInsentient.java
+++ b/src/main/java/net/minecraft/world/entity/EntityInsentient.java
@@ -93,7 +93,7 @@ import org.bukkit.event.entity.EntityUnleashEvent.UnleashReason;
 public abstract class EntityInsentient extends EntityLiving {
 
     private static final DataWatcherObject<Byte> b = DataWatcher.a(EntityInsentient.class, DataWatcherRegistry.a);
-    public int e;
+    public int e;public void setAmbientSoundTime(int time) { this.e = time; } // Paper - OBFHELPER
     protected int f;
     protected ControllerLook lookController;
     protected ControllerMove moveController;
@@ -295,6 +295,7 @@ public abstract class EntityInsentient extends EntityLiving {
         this.datawatcher.register(EntityInsentient.b, (byte) 0);
     }
 
+    public int getAmbientSoundInterval() { return D(); } // Paper - OBFHELPER
     public int D() {
         return 80;
     }
diff --git a/src/main/java/net/minecraft/world/entity/npc/EntityVillagerAbstract.java b/src/main/java/net/minecraft/world/entity/npc/EntityVillagerAbstract.java
index 10067731e6289211cb11b2b368527a1c45603314..49821f0f26864c35be84a4a4288857a04668fbba 100644
--- a/src/main/java/net/minecraft/world/entity/npc/EntityVillagerAbstract.java
+++ b/src/main/java/net/minecraft/world/entity/npc/EntityVillagerAbstract.java
@@ -39,6 +39,9 @@ import org.bukkit.craftbukkit.inventory.CraftMerchantRecipe;
 import org.bukkit.entity.AbstractVillager;
 import org.bukkit.event.entity.VillagerAcquireTradeEvent;
 // CraftBukkit end
+// Paper start
+import io.papermc.paper.event.player.PlayerTradeEvent;
+// Paper end
 
 public abstract class EntityVillagerAbstract extends EntityAgeable implements NPC, IMerchant {
 
@@ -135,16 +138,27 @@ public abstract class EntityVillagerAbstract extends EntityAgeable implements NP
 
     @Override
     public void a(MerchantRecipe merchantrecipe) {
-        merchantrecipe.increaseUses();
-        this.e = -this.D();
-        this.b(merchantrecipe);
+        // Paper - moved down
+        // Paper start
         if (this.tradingPlayer instanceof EntityPlayer) {
-            CriterionTriggers.s.a((EntityPlayer) this.tradingPlayer, this, merchantrecipe.getSellingItem());
+            PlayerTradeEvent event = new PlayerTradeEvent(((EntityPlayer) this.tradingPlayer).getBukkitEntity(), (AbstractVillager) this.getBukkitEntity(), merchantrecipe.asBukkit(), true, true);
+            event.callEvent();
+            if (!event.isCancelled()) {
+                MerchantRecipe recipe = CraftMerchantRecipe.fromBukkit(event.getTrade()).toMinecraft();
+                if (event.willIncreaseTradeUses()) recipe.increaseUses();
+                this.setAmbientSoundTime(-getAmbientSoundInterval());
+                if (event.isRewardingExp()) this.rewardTradeXp(recipe);
+                CriterionTriggers.s.a((EntityPlayer) this.tradingPlayer, this, recipe.getSellingItem());
+            }
+        } else {
+            merchantrecipe.increaseUses();
+            this.setAmbientSoundTime(-getAmbientSoundInterval());
+            this.rewardTradeXp(merchantrecipe);
         }
-
+        // Paper end
     }
 
-    protected abstract void b(MerchantRecipe merchantrecipe);
+    protected abstract void b(MerchantRecipe merchantrecipe); public void rewardTradeXp(MerchantRecipe merchantrecipe) { this.b(merchantrecipe); } // Paper - OBFHELPER
 
     @Override
     public boolean isRegularVillager() {