From 204c6b0142ccce6782bb0831ebfc9018e19b78b9 Mon Sep 17 00:00:00 2001
From: Kodi Craft <kodi@kdcf.me>
Date: Sun, 21 Jul 2024 01:59:57 +0200
Subject: [PATCH] Get past configuration stage

---
 lib/servers/configuration.ex | 29 +++++++++++++++++---
 lib/servers/play.ex          | 52 ++++++++++++++++++++++++++++++++++++
 mix.exs                      |  2 +-
 3 files changed, 79 insertions(+), 4 deletions(-)
 create mode 100644 lib/servers/play.ex

diff --git a/lib/servers/configuration.ex b/lib/servers/configuration.ex
index e789a15..946e203 100644
--- a/lib/servers/configuration.ex
+++ b/lib/servers/configuration.ex
@@ -97,11 +97,11 @@ defmodule Amethyst.Server.Configuration do
   # Serverbound Known Packs https://wiki.vg/Protocol#Serverbound_Known_Packs
   def deserialize(0x07, data) do
     {[count], rest} = Read.start(data) |> Read.varint |> Read.stop
-    {packs, _} = Enum.reduce(0..count, {[], rest}, fn _, {acc, rest} ->
+    {packs, _} = Enum.reduce(1..count, {[], rest}, fn _, {acc, rest} ->
       {[namespace, id, version], rest} = Read.start(rest) |> Read.string |> Read.string |> Read.string |> Read.stop
       {[{namespace, id, version} | acc], rest}
     end)
-    {:resource_pack_stack, packs}
+    {:serverbound_known_packs, packs}
   end
   def deserialize(type, _) do
     raise RuntimeError, "Got unknown packet type #{type}!"
@@ -235,12 +235,35 @@ defmodule Amethyst.Server.Configuration do
 
   ## HANDLING
   @impl true
+  # Client Information https://wiki.vg/Protocol#Client_Information
+  def handle({:client_information, locale, v_dist, chat_mode, chat_colors, displayed_skin_parts, main_hand, text_filtering, allow_listing}, client, state) do
+    state = state |> Keyword.put(:locale, locale) |> Keyword.put(:view_dist, v_dist) |> Keyword.put(:chat_mode, chat_mode) |>
+      Keyword.put(:chat_colors, chat_colors) |> Keyword.put(:displayed_skin_parts, displayed_skin_parts) |> Keyword.put(:main_hand, main_hand) |>
+      Keyword.put(:text_filtering, text_filtering) |> Keyword.put(:allow_listing, allow_listing)
+    # TODO: Here we should create the game handling task for this player and give it
+    # this data.
+    transmit({:clientbound_plugin_message, "minecraft:brand", Write.string("amethyst")}, client)
+    transmit({:clientbound_known_packs, [{"minecraft", "core", "1.21"}]}, client)
+    {:ok, state}
+  end
+  # Serverbound Known Packs https://wiki.vg/Protocol#Serverbound_Known_Packs
+  def handle({:serverbound_known_packs, _packs}, client, state) do
+    # L + ratio + don't care + didn't ask + finish configuration
+    # TODO: we should send registries i think? does amethyst need to deal with vanilla registries at all? god only knows
+    transmit({:finish_configuration}, client)
+    {:ok, state}
+  end
+  # Acknowledge Finish Configuration https://wiki.vg/Protocol#Acknowledge_Finish_Configuration
+  def handle({:acknowledge_finish_configuration}, client, state) do
+    Amethyst.Server.Play.serve(client, state)
+  end
   # Serverbound Plugin Message https://wiki.vg/Protocol#Serverbound_Plugin_Message_(configuration)
   def handle({:serverbound_plugin_message, channel, data}, client, state) do
     handle_plugin_message(channel, data, client, state)
   end
-  def handle(tuple, _) do
+  def handle(tuple, state) do
     Logger.error("Unhandled but known packet #{elem(tuple, 0)}")
+    {:unhandled, state}
   end
   defp handle_plugin_message("minecraft:brand", data, _client, state) do
     {[brand], ""} = Read.start(data) |> Read.string |> Read.stop
diff --git a/lib/servers/play.ex b/lib/servers/play.ex
new file mode 100644
index 0000000..69c4e1f
--- /dev/null
+++ b/lib/servers/play.ex
@@ -0,0 +1,52 @@
+# Amethyst - An experimental Minecraft server written in Elixir.
+# Copyright (C) 2024 KodiCraft
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+defmodule Amethyst.Server.Play do
+  @moduledoc """
+  This module contains the logic for the Play stage of the server.
+  """
+  require Logger
+  use Amethyst.Server
+
+  alias Amethyst.Minecraft.Read
+  alias Amethyst.Minecraft.Write
+
+  @impl true
+  def init(state) do
+    state
+  end
+
+  ## DESERIALIZATION
+  @impl true
+
+  def deserialize(type, _) do
+    raise RuntimeError, "Got unknown packet type #{type}!"
+  end
+
+  ## SERIALIZATION
+  @impl true
+
+  def serialize(packet) do
+    raise ArgumentError, "Tried serializing unknown packet #{inspect(packet)}"
+  end
+
+  ## HANDLING
+  @impl true
+  def handle(tuple, _, state) do
+    Logger.error("Unhandled but known packet #{elem(tuple, 0)}")
+    {:unhandled, state}
+  end
+end
diff --git a/mix.exs b/mix.exs
index bed6248..d24cd48 100644
--- a/mix.exs
+++ b/mix.exs
@@ -14,7 +14,7 @@ defmodule Amethyst.MixProject do
   # Run "mix help compile.app" to learn about applications.
   def application do
     [
-      extra_applications: [:logger],
+      extra_applications: [:logger, :public_key],
       mod: {Amethyst.Application, []}
     ]
   end