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 3249ea9a4b7dc05a1b53373955c267e7a4c7903b..78f7022c6584e634b000cc0c079112fc6cc8e869 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -129,6 +129,7 @@ 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) {
@@ -286,6 +287,7 @@ public abstract class Mob extends LivingEntity {
                 entityliving = null;
             }
         }
+        if (entityliving instanceof ServerPlayer) this.ticksSinceLastInteraction = 0; // Purpur
         this.target = entityliving;
         return true;
         // CraftBukkit end
@@ -330,9 +332,35 @@ 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();
@@ -516,6 +544,7 @@ public abstract class Mob extends LivingEntity {
         }
 
         nbt.putBoolean("Bukkit.Aware", this.aware); // CraftBukkit
+        nbt.putInt("Purpur.ticksSinceLastInteraction", ticksSinceLastInteraction); // Purpur
     }
 
     @Override
@@ -586,6 +615,11 @@ 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
@@ -1607,6 +1641,7 @@ 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/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index 3e58c569253c0162e506c07527bf7306c88ff8c1..971fef23a4381221164834e2c8f30aaf7ee7cd45 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -112,6 +112,11 @@ 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<>();