From 85436bf8d0c03d671b7afc8abfcade610999485d Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sat, 29 Jun 2019 02:32:40 -0500
Subject: [PATCH] Controllable Minecarts

---
 .../java/net/minecraft/server/Entity.java     |  1 +
 .../server/EntityMinecartAbstract.java        | 35 +++++++++++++++++++
 .../java/net/pl3x/purpur/PurpurConfig.java    | 25 +++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index ca429be7db..ee099b6728 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -1294,6 +1294,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
         this.inLava = true;
     }
 
+    public boolean isInLava() { return aD(); } // Purpur - OBFHELPER
     public boolean aD() {
         return this.inLava;
     }
diff --git a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
index 6df2930e2d..d300c05333 100644
--- a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
+++ b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
@@ -4,6 +4,7 @@ import java.util.Iterator;
 import java.util.List;
 import javax.annotation.Nullable;
 
+import net.pl3x.purpur.PurpurConfig; // Purpur
 // CraftBukkit start
 import org.bukkit.Location;
 import org.bukkit.entity.Vehicle;
@@ -330,12 +331,46 @@ public abstract class EntityMinecartAbstract extends Entity {
 
     public void a(int i, int j, int k, boolean flag) {}
 
+    // Purpur start
+    public double getControllableSpeed() {
+        BlockPosition position = new BlockPosition(this);
+        Block block = world.getType(position).getBlock();
+        if (!block.material.isSolid()) {
+            block = world.getType(position.shift(EnumDirection.DOWN)).getBlock();
+        }
+        Double speed = PurpurConfig.controllableMinecartsBlockSpeeds.get(block);
+        if (speed == null) {
+            speed = PurpurConfig.controllableMinecartsBaseSpeed;
+        }
+        return speed;
+    }
+    // Purpur end
+
     protected void i() {
         double d0 = this.getMaxSpeed();
         Vec3D vec3d = this.getMot();
 
         this.setMot(MathHelper.a(vec3d.x, -d0, d0), vec3d.y, MathHelper.a(vec3d.z, -d0, d0));
         if (this.onGround) {
+            // Purpur start
+            if (PurpurConfig.controllableMinecarts && !isInWater() && !isInLava() && !passengers.isEmpty()) {
+                Entity passenger = passengers.get(0);
+                if (passenger instanceof EntityHuman) {
+                    EntityHuman entityhuman = (EntityHuman) passenger;
+                    if (entityhuman.getForward() != 0.0F) {
+                        Vector dir = entityhuman.getBukkitEntity().getEyeLocation().getDirection().normalize().multiply(getControllableSpeed());
+                        if (entityhuman.getForward() < 0.0) {
+                            dir.multiply(-0.5);
+                        }
+                        setMot(new Vec3D(dir.getX(), getMot().y, dir.getZ()));
+                        setStepHeight(1.0F);
+                    } else {
+                        setStepHeight(0.0F);
+                    }
+                    this.yaw = passenger.yaw - 90;
+                }
+            }
+            // Purpur end
             // CraftBukkit start - replace magic numbers with our variables
             this.setMot(new Vec3D(this.getMot().x * this.derailedX, this.getMot().y * this.derailedY, this.getMot().z * this.derailedZ));
             // CraftBukkit end
diff --git a/src/main/java/net/pl3x/purpur/PurpurConfig.java b/src/main/java/net/pl3x/purpur/PurpurConfig.java
index 448d21d9e1..b5aa94e802 100644
--- a/src/main/java/net/pl3x/purpur/PurpurConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurConfig.java
@@ -1,9 +1,13 @@
 package net.pl3x.purpur;
 
 import com.google.common.base.Throwables;
+import net.minecraft.server.Block;
+import net.minecraft.server.IRegistry;
+import net.minecraft.server.MinecraftKey;
 import net.minecraft.server.MinecraftServer;
 import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
+import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.configuration.InvalidConfigurationException;
 import org.bukkit.configuration.file.YamlConfiguration;
 
@@ -293,4 +297,25 @@ public class PurpurConfig {
         ridableZombiePigman = getBoolean("settings.ridable.zombie_pigman", ridableZombiePigman);
         ridableZombieVillager = getBoolean("settings.ridable.zombie_villager", ridableZombieVillager);
     }
+
+    public static boolean controllableMinecarts = true;
+    public static double controllableMinecartsBaseSpeed = 0.1F;
+    public static Map<Block, Double> controllableMinecartsBlockSpeeds = new HashMap<>();
+    private static void controllableMinecarts() {
+        controllableMinecarts = getBoolean("settings.controllable-minecarts.enabled", controllableMinecarts);
+        controllableMinecartsBaseSpeed = getDouble("settings.controllable-minecarts.base-speed", controllableMinecartsBaseSpeed);
+        if (!config.contains("settings.controllable-minecarts.block-speed")) {
+            config.createSection("settings.controllable-minecarts.block-speed");
+        }
+        if (controllableMinecarts) {
+            ConfigurationSection section = config.getConfigurationSection("settings.controllable-minecarts.block-speed");
+            for (String key : section.getKeys(false)) {
+                Block block = IRegistry.BLOCK.get(new MinecraftKey(key));
+                if (block != null) {
+                    controllableMinecartsBlockSpeeds.put(block, section.getDouble(key, controllableMinecartsBaseSpeed));
+                    System.out.println(block + " === " +controllableMinecartsBlockSpeeds.get(block));
+                }
+            }
+        }
+    }
 }
-- 
2.20.1