From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Thu, 25 Jul 2019 18:07:37 -0500
Subject: [PATCH] Implement elytra settings


diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index ae710015f2ef933fc61de4978f773e0014a80023..1abf3eb5a32cf67212e74be69ab008af772eb378 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3567,7 +3567,16 @@ public abstract class LivingEntity extends Entity implements Attackable {
                     int j = i / 10;
 
                     if (j % 2 == 0) {
-                        itemstack.hurtAndBreak(1, this, (entityliving) -> {
+                        // Purpur start
+                        int damage = level().purpurConfig.elytraDamagePerSecond;
+                        if (level().purpurConfig.elytraDamageMultiplyBySpeed > 0) {
+                            double speed = getDeltaMovement().lengthSqr();
+                            if (speed > level().purpurConfig.elytraDamageMultiplyBySpeed) {
+                                damage *= (int) speed;
+                            }
+                        }
+                        itemstack.hurtAndBreak(damage, this, (entityliving) -> {
+                        // Purpur end
                             entityliving.broadcastBreakEvent(EquipmentSlot.CHEST);
                         });
                     }
diff --git a/src/main/java/net/minecraft/world/item/FireworkRocketItem.java b/src/main/java/net/minecraft/world/item/FireworkRocketItem.java
index 82b0bda3e35ec2157a477e1a17b2b46baadc97d9..0fc45b1048a1c4e0dc2bd1ae0437eecbe113cf96 100644
--- a/src/main/java/net/minecraft/world/item/FireworkRocketItem.java
+++ b/src/main/java/net/minecraft/world/item/FireworkRocketItem.java
@@ -15,6 +15,7 @@ import net.minecraft.util.ByIdMap;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.InteractionResultHolder;
+import net.minecraft.world.entity.EquipmentSlot;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.entity.projectile.FireworkRocketEntity;
 import net.minecraft.world.item.context.UseOnContext;
@@ -69,6 +70,14 @@ public class FireworkRocketItem extends Item {
                 com.destroystokyo.paper.event.player.PlayerElytraBoostEvent event = new com.destroystokyo.paper.event.player.PlayerElytraBoostEvent((org.bukkit.entity.Player) user.getBukkitEntity(), org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), (org.bukkit.entity.Firework) fireworkRocketEntity.getBukkitEntity());
                 if (event.callEvent() && world.addFreshEntity(fireworkRocketEntity)) {
                     user.awardStat(Stats.ITEM_USED.get(this));
+                    // Purpur start
+                    if (world.purpurConfig.elytraDamagePerFireworkBoost > 0) {
+                        ItemStack chestItem = user.getItemBySlot(EquipmentSlot.CHEST);
+                        if (chestItem.getItem() == Items.ELYTRA) {
+                            chestItem.hurtAndBreak(world.purpurConfig.elytraDamagePerFireworkBoost, user, (entityliving) -> entityliving.broadcastBreakEvent(EquipmentSlot.CHEST));
+                        }
+                    }
+                    // Purpur end
                     if (event.shouldConsume() && !user.getAbilities().instabuild) {
                     itemStack.shrink(1);
                     } else ((net.minecraft.server.level.ServerPlayer) user).getBukkitEntity().updateInventory();
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 1d2a706a4eee7523bbe89bc18b6d9ddd80581c3a..ee621bad75053831d5c88c783fd8af6359d2c281 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -641,7 +641,7 @@ public final class ItemStack {
             int j;
 
             if (amount > 0) {
-                j = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.UNBREAKING, this);
+                j = (getItem() == Items.ELYTRA && player != null && player.level().purpurConfig.elytraIgnoreUnbreaking) ? 0 : EnchantmentHelper.getItemEnchantmentLevel(Enchantments.UNBREAKING, this);
                 int k = 0;
 
                 for (int l = 0; j > 0 && l < amount; ++l) {
@@ -696,6 +696,12 @@ public final class ItemStack {
                 if (this.hurt(amount, entity.getRandom(), entity /*instanceof ServerPlayer ? (ServerPlayer) entity : null*/)) { // Paper - pass LivingEntity for EntityItemDamageEvent
                     breakCallback.accept(entity);
                     Item item = this.getItem();
+                    // Purpur start
+                    if (item == Items.ELYTRA) {
+                        setDamageValue(item.getMaxDamage() - 1);
+                        return;
+                    }
+                    // Purpur end
                     // CraftBukkit start - Check for item breaking
                     if (this.count == 1 && entity instanceof net.minecraft.world.entity.player.Player) {
                         org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerItemBreakEvent((net.minecraft.world.entity.player.Player) entity, this);
diff --git a/src/main/java/net/minecraft/world/item/TridentItem.java b/src/main/java/net/minecraft/world/item/TridentItem.java
index 5fab851b319847035fb1eefd0ab999de3ccc2cd8..f1d6db9382bec49f61657168fe56b06784d02cf5 100644
--- a/src/main/java/net/minecraft/world/item/TridentItem.java
+++ b/src/main/java/net/minecraft/world/item/TridentItem.java
@@ -131,6 +131,14 @@ public class TridentItem extends Item implements Vanishable {
                         f2 *= f6 / f5;
                         f3 *= f6 / f5;
                         f4 *= f6 / f5;
+
+                        // Purpur start
+                        ItemStack chestItem = entityhuman.getItemBySlot(EquipmentSlot.CHEST);
+                        if (chestItem.getItem() == Items.ELYTRA && world.purpurConfig.elytraDamagePerTridentBoost > 0) {
+                            chestItem.hurtAndBreak(world.purpurConfig.elytraDamagePerTridentBoost, entityhuman, (entity) -> entity.broadcastBreakEvent(EquipmentSlot.CHEST));
+                        }
+                        // Purpur end
+
                         entityhuman.push((double) f2, (double) f3, (double) f4);
                         entityhuman.startAutoSpinAttack(20);
                         if (entityhuman.onGround()) {
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index e6f132ad886d1db2383a8f07489f6da2aa863dae..9aab2c1dc14f9683953cb2876ee9471f603da629 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -112,6 +112,19 @@ public class PurpurWorldConfig {
         voidDamageDealt = getDouble("gameplay-mechanics.void-damage-dealt", voidDamageDealt);
     }
 
+    public int elytraDamagePerSecond = 1;
+    public double elytraDamageMultiplyBySpeed = 0;
+    public boolean elytraIgnoreUnbreaking = false;
+    public int elytraDamagePerFireworkBoost = 0;
+    public int elytraDamagePerTridentBoost = 0;
+    private void elytraSettings() {
+        elytraDamagePerSecond = getInt("gameplay-mechanics.elytra.damage-per-second", elytraDamagePerSecond);
+        elytraDamageMultiplyBySpeed = getDouble("gameplay-mechanics.elytra.damage-multiplied-by-speed", elytraDamageMultiplyBySpeed);
+        elytraIgnoreUnbreaking = getBoolean("gameplay-mechanics.elytra.ignore-unbreaking", elytraIgnoreUnbreaking);
+        elytraDamagePerFireworkBoost = getInt("gameplay-mechanics.elytra.damage-per-boost.firework", elytraDamagePerFireworkBoost);
+        elytraDamagePerTridentBoost = getInt("gameplay-mechanics.elytra.damage-per-boost.trident", elytraDamagePerTridentBoost);
+    }
+
     public double minecartMaxSpeed = 0.4D;
     public boolean minecartPlaceAnywhere = false;
     public boolean minecartControllable = false;