From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Wed, 25 Jan 2023 11:03:53 +0800
Subject: [PATCH] Appleskin Protocol


diff --git a/src/main/java/org/leavesmc/leaves/protocol/AppleSkinProtocol.java b/src/main/java/org/leavesmc/leaves/protocol/AppleSkinProtocol.java
new file mode 100644
index 0000000000000000000000000000000000000000..dd8afa5a47e62829788c4d49d18e4436daa242dd
--- /dev/null
+++ b/src/main/java/org/leavesmc/leaves/protocol/AppleSkinProtocol.java
@@ -0,0 +1,127 @@
+package org.leavesmc.leaves.protocol;
+
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.food.FoodData;
+import net.minecraft.world.level.GameRules;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.leavesmc.leaves.LeavesConfig;
+import org.leavesmc.leaves.protocol.core.LeavesProtocol;
+import org.leavesmc.leaves.protocol.core.ProtocolHandler;
+import org.leavesmc.leaves.protocol.core.ProtocolUtils;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+@LeavesProtocol(namespace = "appleskin")
+public class AppleSkinProtocol {
+
+    public static final String PROTOCOL_ID = "appleskin";
+
+    private static final ResourceLocation SATURATION_KEY = id("saturation");
+    private static final ResourceLocation EXHAUSTION_KEY = id("exhaustion");
+    private static final ResourceLocation NATURAL_REGENERATION_KEY = id("natural_regeneration");
+
+    private static final float MINIMUM_EXHAUSTION_CHANGE_THRESHOLD = 0.01F;
+
+    private static final Map<ServerPlayer, Float> previousSaturationLevels = new HashMap<>();
+    private static final Map<ServerPlayer, Float> previousExhaustionLevels = new HashMap<>();
+    private static final Map<ServerPlayer, Boolean> previousNaturalRegeneration = new HashMap<>();
+
+    private static final Map<ServerPlayer, Set<String>> subscribedChannels = new HashMap<>();
+
+    @Contract("_ -> new")
+    public static @NotNull ResourceLocation id(String path) {
+        return new ResourceLocation(PROTOCOL_ID, path);
+    }
+
+    @ProtocolHandler.PlayerJoin
+    public static void onPlayerLoggedIn(@NotNull ServerPlayer player) {
+        if (LeavesConfig.protocol.appleskin.enable) {
+            resetPlayerData(player);
+        }
+    }
+
+    @ProtocolHandler.PlayerLeave
+    public static void onPlayerLoggedOut(@NotNull ServerPlayer player) {
+        if (LeavesConfig.protocol.appleskin.enable) {
+            subscribedChannels.remove(player);
+            resetPlayerData(player);
+        }
+    }
+
+    @ProtocolHandler.MinecraftRegister(ignoreId = true)
+    public static void onPlayerSubscribed(@NotNull ServerPlayer player, String channel) {
+        if (LeavesConfig.protocol.appleskin.enable) {
+            subscribedChannels.computeIfAbsent(player, k -> new HashSet<>()).add(channel);
+        }
+    }
+
+    @ProtocolHandler.Ticker
+    public static void tick() {
+        if (LeavesConfig.protocol.appleskin.enable) {
+            if (MinecraftServer.getServer().getTickCount() % LeavesConfig.protocol.appleskin.syncTickInterval != 0) {
+                return;
+            }
+
+            for (Map.Entry<ServerPlayer, Set<String>> entry : subscribedChannels.entrySet()) {
+                ServerPlayer player = entry.getKey();
+                FoodData data = player.getFoodData();
+
+                for (String channel : entry.getValue()) {
+                    switch (channel) {
+                        case "saturation" -> {
+                            float saturation = data.getSaturationLevel();
+                            Float previousSaturation = previousSaturationLevels.get(player);
+                            if (previousSaturation == null || saturation != previousSaturation) {
+                                ProtocolUtils.sendPayloadPacket(player, SATURATION_KEY, buf -> buf.writeFloat(saturation));
+                                previousSaturationLevels.put(player, saturation);
+                            }
+                        }
+
+                        case "exhaustion" -> {
+                            float exhaustion = data.exhaustionLevel;
+                            Float previousExhaustion = previousExhaustionLevels.get(player);
+                            if (previousExhaustion == null || Math.abs(exhaustion - previousExhaustion) >= MINIMUM_EXHAUSTION_CHANGE_THRESHOLD) {
+                                ProtocolUtils.sendPayloadPacket(player, EXHAUSTION_KEY, buf -> buf.writeFloat(exhaustion));
+                                previousExhaustionLevels.put(player, exhaustion);
+                            }
+                        }
+
+                        case "natural_regeneration" -> {
+                            boolean regeneration = player.serverLevel().getGameRules().getBoolean(GameRules.RULE_NATURAL_REGENERATION);
+                            Boolean previousRegeneration = previousNaturalRegeneration.get(player);
+                            if (previousRegeneration == null || regeneration != previousRegeneration) {
+                                ProtocolUtils.sendPayloadPacket(player, NATURAL_REGENERATION_KEY, buf -> buf.writeBoolean(regeneration));
+                                previousNaturalRegeneration.put(player, regeneration);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    @ProtocolHandler.ReloadServer
+    public static void onServerReload() {
+        if (!LeavesConfig.protocol.appleskin.enable) {
+            disableAllPlayer();
+        }
+    }
+
+    public static void disableAllPlayer() {
+        for (ServerPlayer player : MinecraftServer.getServer().getPlayerList().getPlayers()) {
+            onPlayerLoggedOut(player);
+        }
+    }
+
+    private static void resetPlayerData(@NotNull ServerPlayer player) {
+        previousExhaustionLevels.remove(player);
+        previousSaturationLevels.remove(player);
+        previousNaturalRegeneration.remove(player);
+    }
+}