From 2bab0d1d19ac0d3118a5b9da1a9cbd2959148e05 Mon Sep 17 00:00:00 2001
From: AJ Ferguson <fergusonjva@gmail.com>
Date: Thu, 17 Oct 2019 23:54:20 -0800
Subject: [PATCH] Calculate attribute modifiers and fix sprinting/sneaking

---
 .../org/geysermc/connector/entity/Entity.java | 36 +++++++++----------
 .../bedrock/BedrockActionTranslator.java      |  2 +-
 .../entity/JavaEntityMetadataTranslator.java  | 12 +++++++
 .../JavaEntityPropertiesTranslator.java       | 15 ++++----
 .../connector/utils/AttributeUtils.java       | 24 +++++++++++++
 5 files changed, 61 insertions(+), 28 deletions(-)

diff --git a/connector/src/main/java/org/geysermc/connector/entity/Entity.java b/connector/src/main/java/org/geysermc/connector/entity/Entity.java
index 69dcaf0f..8824c953 100644
--- a/connector/src/main/java/org/geysermc/connector/entity/Entity.java
+++ b/connector/src/main/java/org/geysermc/connector/entity/Entity.java
@@ -71,6 +71,7 @@ public class Entity {
 
     protected Set<Long> passengers = new HashSet<>();
     protected Map<AttributeType, Attribute> attributes = new HashMap<>();
+    protected EntityDataDictionary metadata = new EntityDataDictionary();
 
     public Entity(long entityId, long geyserId, EntityType entityType, Vector3f position, Vector3f motion, Vector3f rotation) {
         this.entityId = entityId;
@@ -83,6 +84,19 @@ public class Entity {
         this.valid = false;
         this.movePending = false;
         this.dimension = 0;
+
+        metadata.put(EntityData.SCALE, 1f);
+        metadata.put(EntityData.MAX_AIR, (short) 400);
+        metadata.put(EntityData.AIR, (short) 0);
+        metadata.put(EntityData.LEAD_HOLDER_EID, -1L);
+        metadata.put(EntityData.BOUNDING_BOX_HEIGHT, entityType.getHeight());
+        metadata.put(EntityData.BOUNDING_BOX_WIDTH, entityType.getWidth());
+        EntityFlags flags = new EntityFlags();
+        flags.setFlag(EntityFlag.HAS_GRAVITY, true);
+        flags.setFlag(EntityFlag.HAS_COLLISION, true);
+        flags.setFlag(EntityFlag.CAN_SHOW_NAME, true);
+        flags.setFlag(EntityFlag.CAN_CLIMB, true);
+        metadata.putFlags(flags);
     }
 
     public void spawnEntity(GeyserSession session) {
@@ -94,7 +108,7 @@ public class Entity {
         addEntityPacket.setMotion(motion);
         addEntityPacket.setRotation(getBedrockRotation());
         addEntityPacket.setEntityType(entityType.getType());
-        addEntityPacket.getMetadata().putAll(getMetadata());
+        addEntityPacket.getMetadata().putAll(metadata);
 
         valid = true;
         session.getUpstream().sendPacket(addEntityPacket);
@@ -137,24 +151,6 @@ public class Entity {
         this.movePending = true;
     }
 
-    public EntityDataDictionary getMetadata() {
-        EntityFlags flags = new EntityFlags();
-        flags.setFlag(EntityFlag.HAS_GRAVITY, true);
-        flags.setFlag(EntityFlag.HAS_COLLISION, true);
-        flags.setFlag(EntityFlag.CAN_SHOW_NAME, true);
-        flags.setFlag(EntityFlag.CAN_CLIMB, true);
-
-        EntityDataDictionary dictionary = new EntityDataDictionary();
-        dictionary.put(EntityData.SCALE, 1f);
-        dictionary.put(EntityData.MAX_AIR, (short) 400);
-        dictionary.put(EntityData.AIR, (short) 0);
-        dictionary.put(EntityData.LEAD_HOLDER_EID, -1L);
-        dictionary.put(EntityData.BOUNDING_BOX_HEIGHT, entityType.getHeight());
-        dictionary.put(EntityData.BOUNDING_BOX_WIDTH, entityType.getWidth());
-        dictionary.putFlags(flags);
-        return dictionary;
-    }
-
     public void updateBedrockAttributes(GeyserSession session) {
         List<com.nukkitx.protocol.bedrock.data.Attribute> attributes = new ArrayList<>();
         for (Map.Entry<AttributeType, Attribute> entry : this.attributes.entrySet()) {
@@ -171,7 +167,7 @@ public class Entity {
 
         SetEntityDataPacket entityDataPacket = new SetEntityDataPacket();
         entityDataPacket.setRuntimeEntityId(geyserId);
-        entityDataPacket.getMetadata().putAll(getMetadata());
+        entityDataPacket.getMetadata().putAll(metadata);
         session.getUpstream().sendPacket(entityDataPacket);
     }
 
diff --git a/connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockActionTranslator.java b/connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockActionTranslator.java
index f0e63d2c..0b5ad4ad 100644
--- a/connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockActionTranslator.java
+++ b/connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockActionTranslator.java
@@ -43,7 +43,7 @@ public class BedrockActionTranslator extends PacketTranslator<PlayerActionPacket
 
     @Override
     public void translate(PlayerActionPacket packet, GeyserSession session) {
-        Entity entity = session.getEntityCache().getEntityByGeyserId(packet.getRuntimeEntityId());
+        Entity entity = session.getPlayerEntity();
         if (entity == null)
             return;
 
diff --git a/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityMetadataTranslator.java b/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityMetadataTranslator.java
index e515d65b..ff84a629 100644
--- a/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityMetadataTranslator.java
+++ b/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityMetadataTranslator.java
@@ -25,7 +25,10 @@
 
 package org.geysermc.connector.network.translators.java.entity;
 
+import com.github.steveice10.mc.protocol.data.game.entity.metadata.EntityMetadata;
+import com.github.steveice10.mc.protocol.data.game.entity.metadata.MetadataType;
 import com.github.steveice10.mc.protocol.packet.ingame.server.entity.ServerEntityMetadataPacket;
+import com.nukkitx.protocol.bedrock.data.EntityFlag;
 import com.nukkitx.protocol.bedrock.packet.SetEntityDataPacket;
 import org.geysermc.connector.entity.Entity;
 import org.geysermc.connector.network.session.GeyserSession;
@@ -42,6 +45,15 @@ public class JavaEntityMetadataTranslator extends PacketTranslator<ServerEntityM
         if (entity == null) return;
 
         if (entity.isValid()) {
+            //temp sprint/sneak fix
+            for (EntityMetadata metadata : packet.getMetadata()) {
+                if (metadata.getId() == 0 && metadata.getType() == MetadataType.BYTE) {
+                    byte xd = (byte)metadata.getValue();
+                    entity.getMetadata().getFlags().setFlag(EntityFlag.SPRINTING, (xd & 0x08) == 0x08);
+                    entity.getMetadata().getFlags().setFlag(EntityFlag.SNEAKING, (xd & 0x02) == 0x02);
+                }
+            }
+
             // TODO: Make this actually useful lol
             SetEntityDataPacket entityDataPacket = new SetEntityDataPacket();
             entityDataPacket.setRuntimeEntityId(entity.getGeyserId());
diff --git a/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityPropertiesTranslator.java b/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityPropertiesTranslator.java
index 387915fa..d3377ded 100644
--- a/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityPropertiesTranslator.java
+++ b/connector/src/main/java/org/geysermc/connector/network/translators/java/entity/JavaEntityPropertiesTranslator.java
@@ -31,6 +31,7 @@ import org.geysermc.connector.entity.Entity;
 import org.geysermc.connector.entity.attribute.AttributeType;
 import org.geysermc.connector.network.session.GeyserSession;
 import org.geysermc.connector.network.translators.PacketTranslator;
+import org.geysermc.connector.utils.AttributeUtils;
 
 public class JavaEntityPropertiesTranslator extends PacketTranslator<ServerEntityPropertiesPacket> {
 
@@ -45,23 +46,23 @@ public class JavaEntityPropertiesTranslator extends PacketTranslator<ServerEntit
         for (Attribute attribute : packet.getAttributes()) {
             switch (attribute.getType()) {
                 case GENERIC_MAX_HEALTH:
-                    entity.getAttributes().put(AttributeType.MAX_HEALTH, AttributeType.MAX_HEALTH.getAttribute((float) attribute.getValue()));
+                    entity.getAttributes().put(AttributeType.MAX_HEALTH, AttributeType.MAX_HEALTH.getAttribute((float) AttributeUtils.calculateValue(attribute)));
                     break;
                 case GENERIC_ATTACK_DAMAGE:
-                    entity.getAttributes().put(AttributeType.ATTACK_DAMAGE, AttributeType.ATTACK_DAMAGE.getAttribute((float) attribute.getValue()));
+                    entity.getAttributes().put(AttributeType.ATTACK_DAMAGE, AttributeType.ATTACK_DAMAGE.getAttribute((float) AttributeUtils.calculateValue(attribute)));
                     break;
                 case GENERIC_FLYING_SPEED:
-                    entity.getAttributes().put(AttributeType.FLYING_SPEED, AttributeType.FLYING_SPEED.getAttribute((float) attribute.getValue()));
-                    entity.getAttributes().put(AttributeType.MOVEMENT_SPEED, AttributeType.MOVEMENT_SPEED.getAttribute((float) attribute.getValue()));
+                    entity.getAttributes().put(AttributeType.FLYING_SPEED, AttributeType.FLYING_SPEED.getAttribute((float) AttributeUtils.calculateValue(attribute)));
+                    entity.getAttributes().put(AttributeType.MOVEMENT_SPEED, AttributeType.MOVEMENT_SPEED.getAttribute((float) AttributeUtils.calculateValue(attribute)));
                     break;
                 case GENERIC_MOVEMENT_SPEED:
-                    entity.getAttributes().put(AttributeType.MOVEMENT_SPEED, AttributeType.MOVEMENT_SPEED.getAttribute((float) attribute.getValue()));
+                    entity.getAttributes().put(AttributeType.MOVEMENT_SPEED, AttributeType.MOVEMENT_SPEED.getAttribute((float) AttributeUtils.calculateValue(attribute)));
                     break;
                 case GENERIC_FOLLOW_RANGE:
-                    entity.getAttributes().put(AttributeType.FOLLOW_RANGE, AttributeType.FOLLOW_RANGE.getAttribute((float) attribute.getValue()));
+                    entity.getAttributes().put(AttributeType.FOLLOW_RANGE, AttributeType.FOLLOW_RANGE.getAttribute((float) AttributeUtils.calculateValue(attribute)));
                     break;
                 case GENERIC_KNOCKBACK_RESISTANCE:
-                    entity.getAttributes().put(AttributeType.KNOCKBACK_RESISTANCE, AttributeType.KNOCKBACK_RESISTANCE.getAttribute((float) attribute.getValue()));
+                    entity.getAttributes().put(AttributeType.KNOCKBACK_RESISTANCE, AttributeType.KNOCKBACK_RESISTANCE.getAttribute((float) AttributeUtils.calculateValue(attribute)));
                     break;
             }
         }
diff --git a/connector/src/main/java/org/geysermc/connector/utils/AttributeUtils.java b/connector/src/main/java/org/geysermc/connector/utils/AttributeUtils.java
index df58e2b1..83b4bd24 100644
--- a/connector/src/main/java/org/geysermc/connector/utils/AttributeUtils.java
+++ b/connector/src/main/java/org/geysermc/connector/utils/AttributeUtils.java
@@ -1,5 +1,7 @@
 package org.geysermc.connector.utils;
 
+import com.github.steveice10.mc.protocol.data.game.entity.attribute.AttributeModifier;
+import com.github.steveice10.mc.protocol.data.game.entity.attribute.ModifierOperation;
 import org.geysermc.connector.entity.attribute.Attribute;
 import org.geysermc.connector.entity.attribute.AttributeType;
 
@@ -42,4 +44,26 @@ public class AttributeUtils {
 
         return new com.nukkitx.protocol.bedrock.data.Attribute(type.getBedrockIdentifier(), attribute.getMinimum(), attribute.getMaximum(), attribute.getValue(), attribute.getDefaultValue());
     }
+
+    //https://minecraft.gamepedia.com/Attribute#Modifiers
+    public static double calculateValue(com.github.steveice10.mc.protocol.data.game.entity.attribute.Attribute attribute) {
+        double base = attribute.getValue();
+        for (AttributeModifier modifier : attribute.getModifiers()) {
+            if (modifier.getOperation() == ModifierOperation.ADD) {
+                base += modifier.getAmount();
+            }
+        }
+        double value = base;
+        for (AttributeModifier modifier : attribute.getModifiers()) {
+            if (modifier.getOperation() == ModifierOperation.ADD_MULTIPLIED) {
+                value += base * modifier.getAmount();
+            }
+        }
+        for (AttributeModifier modifier : attribute.getModifiers()) {
+            if (modifier.getOperation() == ModifierOperation.MULTIPLY) {
+                value *= 1.0D + modifier.getAmount();
+            }
+        }
+        return value;
+    }
 }