From c880ea95f3066d54f70b1cdb34ac9d99c4d228a1 Mon Sep 17 00:00:00 2001
From: Kodi Craft <kodi@kdcf.me>
Date: Tue, 1 Oct 2024 08:21:30 +0200
Subject: [PATCH] Implement player info update packet

---
 apps/amethyst/lib/states/macros.ex |  8 ++++-
 apps/amethyst/lib/states/play.ex   | 52 ++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/apps/amethyst/lib/states/macros.ex b/apps/amethyst/lib/states/macros.ex
index 86b3970..d52f767 100644
--- a/apps/amethyst/lib/states/macros.ex
+++ b/apps/amethyst/lib/states/macros.ex
@@ -95,6 +95,7 @@ defmodule Amethyst.ConnectionState.Macros do
           Enum.reduce(Map.get(packet, name), "", fn item, acc ->
               acc <> write_signature(item, signature)
           end)
+        {:literal, {type, value}} -> acc <> apply(Write, type, [value])
         t -> acc <> apply(Write, t, [Map.get(packet, name)])
       end
     end)
@@ -104,7 +105,12 @@ defmodule Amethyst.ConnectionState.Macros do
     try do
       Enum.all?(signature, fn {name, type} ->
         case Map.get(packet, name, :missing) do
-          :missing -> throw {:missing, name}
+          :missing ->
+            if elem(type, 0) == :literal do
+              true
+            else
+              throw {:missing, name}
+            end
           value -> case type_matches(value, type) do
             true -> true
             false -> throw {:mismatch, name, value, type}
diff --git a/apps/amethyst/lib/states/play.ex b/apps/amethyst/lib/states/play.ex
index c00c81a..e91c06d 100644
--- a/apps/amethyst/lib/states/play.ex
+++ b/apps/amethyst/lib/states/play.ex
@@ -71,6 +71,58 @@ defmodule Amethyst.ConnectionState.Play do
     portal_cooldown: :varint,
     enforces_secure_chat: :bool,
   ]
+  Macros.defpacket_clientbound :player_info_update_add_player, 0x2E, 767, [
+    actions: {:literal, 0x01},
+    players: {:array, [
+      uuid: :uuid,
+      name: :string,
+      properties: {:array, [
+        name: :string,
+        value: :string,
+        signature: {:optional, :string},
+      ]}
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_initialize_chat, 0x2E, 767, [
+    actions: {:literal, 0x02},
+    players: {:array, [
+      uuid: :uuid,
+      data: {:optional, {:compound, [
+        chat_session_id: :uuid,
+        public_key_expiry_time: :long,
+        encoded_public_key: :byte_array,
+        public_key_signature: :byte_array
+      ]}}
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_game_mode, 0x2E, 767, [
+    actions: {:literal, 0x04},
+    players: {:array, [
+      uuid: :uuid,
+      gamemode: :varint
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_listed, 0x2E, 767, [
+    actions: {:literal, 0x08},
+    players: {:array, [
+      uuid: :uuid,
+      listed: :bool
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_latency, 0x2E, 767, [
+    actions: {:literal, 0x10},
+    players: {:array, [
+      uuid: :uuid,
+      ping: :varint, # Milliseconds
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_display_name, 0x2E, 767, [
+    actions: {:literal, 0x20},
+    players: {:array, [
+      uuid: :uuid,
+      display_name: {:optional, :nbt}
+    ]}
+  ]
   Macros.defpacket_clientbound :synchronize_player_position, 0x40, 767, [
     x: :double,
     y: :double,