From a1d538f2999539edc1af5eae754e7e292aeeb498 Mon Sep 17 00:00:00 2001
From: alemi <me@alemi.dev>
Date: Sat, 18 Mar 2023 22:09:40 +0100
Subject: feat: better packet antikick for vanillaflight

---
 .../ftbsc/bscv/modules/motion/VanillaFlight.java   | 64 ++++++++++++++++------
 src/main/resources/META-INF/accesstransformer.cfg  |  1 +
 2 files changed, 47 insertions(+), 18 deletions(-)

diff --git a/src/main/java/ftbsc/bscv/modules/motion/VanillaFlight.java b/src/main/java/ftbsc/bscv/modules/motion/VanillaFlight.java
index c6ef507..3de7772 100644
--- a/src/main/java/ftbsc/bscv/modules/motion/VanillaFlight.java
+++ b/src/main/java/ftbsc/bscv/modules/motion/VanillaFlight.java
@@ -4,6 +4,7 @@ import com.google.auto.service.AutoService;
 import ftbsc.bscv.ICommons;
 import ftbsc.bscv.api.ILoadable;
 import ftbsc.bscv.modules.QuickModule;
+import ftbsc.bscv.patches.PacketPatch.PacketEvent;
 import ftbsc.bscv.tools.Setting;
 import net.minecraft.client.entity.player.ClientPlayerEntity;
 import net.minecraft.network.play.client.CPlayerPacket;
@@ -14,12 +15,7 @@ import net.minecraftforge.event.TickEvent.Phase;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 
 @AutoService(ILoadable.class)
-public class VanillaFlight extends QuickModule implements ICommons {
-
-	@Override
-	protected int getDefaultKey() {
-		return UNBOUND;
-	}
+public class VanillaFlight extends QuickModule {
 
 	private enum AntikickMode {
 		NONE,
@@ -27,11 +23,14 @@ public class VanillaFlight extends QuickModule implements ICommons {
 		FORCED
 	}
 
+	private static final int MS_PER_TICK = 50;
+
 	public final ForgeConfigSpec.ConfigValue<Boolean> force;
 	public final ForgeConfigSpec.ConfigValue<Double>  speed;
 	public final ForgeConfigSpec.ConfigValue<AntikickMode> antikick;
 	public final ForgeConfigSpec.ConfigValue<Double>  antikick_magnitude;
 	public final ForgeConfigSpec.ConfigValue<Integer> antikick_cycle;
+	public final ForgeConfigSpec.ConfigValue<Integer> antikick_duration;
 
 	private int tick = 0;
 
@@ -71,11 +70,28 @@ public class VanillaFlight extends QuickModule implements ICommons {
 			.name("cycle")
 			.comment("how often to run antikick routine")
 			.build(this);
+
+		this.antikick_duration = Setting.Number.builder()
+			.min(1)
+			.max(80)
+			.fallback(5)
+			.name("duration")
+			.comment("how long to apply antikick (only for PACKET)")
+			.build(this);
 	}
 
+	private long last_event = 0;
+
 	private boolean couldFlyBefore = false;
 	private float flyingSpeedBefore = 0.05f;
 
+	private AntikickState antikickState = AntikickState.COOLDOWN;
+
+	private enum AntikickState {
+		COOLDOWN,
+		ACTIVE
+	}
+
 	@SubscribeEvent
 	public void onTick(TickEvent.ClientTickEvent event) {
 		if (event.phase == Phase.END) return;
@@ -90,19 +106,31 @@ public class VanillaFlight extends QuickModule implements ICommons {
 		this.tick = ( this.tick + 1 ) % this.antikick_cycle.get();
 		Vector3d pos = MC.player.position();
 
-		if (this.tick == 0) {
-			switch (this.antikick.get()) {
-				case PACKET:
-					MC.player.connection.send(
-						new CPlayerPacket.PositionPacket(pos.x, pos.y - this.antikick_magnitude.get(), pos.z, false)
-					);
-					break;
-				case FORCED:
-					MC.player.setPos(pos.x, pos.y - this.antikick_magnitude.get(), pos.z);
-					break;
-				case NONE:
+		if (this.tick == 0 && this.antikick.get() == AntikickMode.PACKET) {
+			MC.player.setPos(pos.x, pos.y - this.antikick_magnitude.get(), pos.z);
+		}
+	}
+
+	@SubscribeEvent
+	public void onPacketSent(PacketEvent.Outgoing event) {
+		long now = System.currentTimeMillis();
+		switch (this.antikickState) {
+			case COOLDOWN:
+				if (now - this.last_event < this.antikick_cycle.get() * MS_PER_TICK) break;
+				this.last_event = now;
+				this.antikickState = AntikickState.ACTIVE; // don't break and also run ACTIVE
+			case ACTIVE:
+				if (now - this.last_event > this.antikick_duration.get() * MS_PER_TICK) {
+					this.antikickState = AntikickState.COOLDOWN;
 					break;
-			}
+				}
+				if (
+					event.packet instanceof CPlayerPacket.PositionPacket ||
+					event.packet instanceof CPlayerPacket.PositionRotationPacket
+				) {
+					CPlayerPacket packet  = (CPlayerPacket) event.packet;
+					packet.y = packet.y - this.antikick_magnitude.get();
+				}
 		}
 	}
 
diff --git a/src/main/resources/META-INF/accesstransformer.cfg b/src/main/resources/META-INF/accesstransformer.cfg
index f67a604..5be5b4b 100644
--- a/src/main/resources/META-INF/accesstransformer.cfg
+++ b/src/main/resources/META-INF/accesstransformer.cfg
@@ -2,5 +2,6 @@ public net.minecraft.client.gui.screen.Screen field_230710_m_ # buttons
 public net.minecraft.client.gui.screen.Screen field_230705_e_ # children
 public net.minecraft.client.network.play.NetworkPlayerInfo field_178866_b # gameMode
 public net.minecraft.network.play.client.CPlayerPacket field_149474_g # onGround
+public net.minecraft.network.play.client.CPlayerPacket field_149477_b # y
 public net.minecraft.client.multiplayer.PlayerController func_78750_j()V # ensureHasSentCarriedItem()
 public net.minecraft.client.Minecraft field_71467_ac # rightClickDelay
-- 
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