From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sat, 11 Jul 2020 19:41:34 -0500
Subject: [PATCH] Entity lifespan


diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index 8e5c1ee1023a76f7619ffc0cdc3940582da81509..8e678245600bb3eaa4dca0360e3505aa5cd35030 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -126,6 +126,7 @@ public abstract class Mob extends LivingEntity {
     private BlockPos restrictCenter;
     private float restrictRadius;
 
+    public int ticksSinceLastInteraction; // Purpur
     public boolean aware = true; // CraftBukkit
 
     protected Mob(EntityType<? extends Mob> type, Level world) {
@@ -283,6 +284,7 @@ public abstract class Mob extends LivingEntity {
                 entityliving = null;
             }
         }
+        if (entityliving instanceof ServerPlayer) this.ticksSinceLastInteraction = 0; // Purpur
         this.target = entityliving;
         return true;
         // CraftBukkit end
@@ -327,9 +329,35 @@ public abstract class Mob extends LivingEntity {
             this.playAmbientSound();
         }
 
+        incrementTicksSinceLastInteraction();
         this.level.getProfiler().pop();
     }
 
+    // Purpur start
+    private void incrementTicksSinceLastInteraction() {
+        ++ticksSinceLastInteraction;
+        //if (hasRider()) {
+        //    ticksSinceLastInteraction = 0;
+        //    return;
+        //}
+        if (level.purpurConfig.entityLifeSpan <= 0) {
+            return; // feature disabled
+        }
+        if (!this.removeWhenFarAway(0) || isPersistenceRequired() || requiresCustomPersistence() || hasCustomName()) {
+            return; // mob persistent
+        }
+        if (ticksSinceLastInteraction > level.purpurConfig.entityLifeSpan) {
+            this.discard();
+        }
+    }
+
+    @Override
+    public boolean hurt(DamageSource source, float amount) {
+        if (source.getEntity() instanceof ServerPlayer) this.ticksSinceLastInteraction = 0; // Purpur
+        return super.hurt(source, amount);
+    }
+    // Purpur end
+
     @Override
     protected void playHurtSound(DamageSource source) {
         this.resetAmbientSoundTime();
@@ -513,6 +541,7 @@ public abstract class Mob extends LivingEntity {
         }
 
         nbt.putBoolean("Bukkit.Aware", this.aware); // CraftBukkit
+        nbt.putInt("Purpur.ticksSinceLastInteraction", ticksSinceLastInteraction); // Purpur
     }
 
     @Override
@@ -583,6 +612,11 @@ public abstract class Mob extends LivingEntity {
             this.aware = nbt.getBoolean("Bukkit.Aware");
         }
         // CraftBukkit end
+        // Purpur start
+        if (nbt.contains("Purpur.ticksSinceLastInteraction")) {
+            ticksSinceLastInteraction = nbt.getInt("Purpur.ticksSinceLastInteraction");
+        }
+        // Purpur end
     }
 
     @Override
@@ -1592,6 +1626,7 @@ public abstract class Mob extends LivingEntity {
             this.setLastHurtMob(target);
         }
 
+        if (target instanceof ServerPlayer) this.ticksSinceLastInteraction = 0; // Purpur
         return flag;
     }
 
diff --git a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
index 059dad063ac6e9d9fc5713df54705ee65a683dc2..fc521ed7418ce1dd53726f3621b68ccb01b1b3d2 100644
--- a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
@@ -111,6 +111,11 @@ public class PurpurWorldConfig {
         elytraDamagePerTridentBoost = getInt("gameplay-mechanics.elytra.damage-per-boost.trident", elytraDamagePerTridentBoost);
     }
 
+    public int entityLifeSpan = 0;
+    private void entitySettings() {
+        entityLifeSpan = getInt("gameplay-mechanics.entity-lifespan", entityLifeSpan);
+    }
+
     public List<Item> itemImmuneToCactus = new ArrayList<>();
     public List<Item> itemImmuneToExplosion = new ArrayList<>();
     public List<Item> itemImmuneToFire = new ArrayList<>();
