Start repo, claude & kimi still vibing tho

lib/odinsea/shop/client.ex

@@ -0,0 +1,90 @@
+defmodule Odinsea.Shop.Client do
+  @moduledoc """
+  Client connection handler for the cash shop server.
+  """
+
+  use GenServer, restart: :temporary
+
+  require Logger
+
+  alias Odinsea.Net.Packet.In
+
+  defstruct [:socket, :ip, :state, :character_id, :account_id]
+
+  def start_link(socket) do
+    GenServer.start_link(__MODULE__, socket)
+  end
+
+  @impl true
+  def init(socket) do
+    {:ok, {ip, _port}} = :inet.peername(socket)
+    ip_string = format_ip(ip)
+
+    Logger.info("Cash shop client connected from #{ip_string}")
+
+    state = %__MODULE__{
+      socket: socket,
+      ip: ip_string,
+      state: :connected,
+      character_id: nil,
+      account_id: nil
+    }
+
+    send(self(), :receive)
+    {:ok, state}
+  end
+
+  @impl true
+  def handle_info(:receive, %{socket: socket} = state) do
+    case :gen_tcp.recv(socket, 0, 30_000) do
+      {:ok, data} ->
+        new_state = handle_packet(data, state)
+        send(self(), :receive)
+        {:noreply, new_state}
+
+      {:error, :closed} ->
+        Logger.info("Cash shop client disconnected: #{state.ip}")
+        {:stop, :normal, state}
+
+      {:error, reason} ->
+        Logger.warning("Cash shop client error: #{inspect(reason)}")
+        {:stop, :normal, state}
+    end
+  end
+
+  @impl true
+  def terminate(_reason, state) do
+    if state.socket do
+      :gen_tcp.close(state.socket)
+    end
+
+    :ok
+  end
+
+  defp handle_packet(data, state) do
+    packet = In.new(data)
+
+    case In.decode_short(packet) do
+      {opcode, packet} ->
+        Logger.debug("Cash shop packet: opcode=0x#{Integer.to_string(opcode, 16)}")
+        dispatch_packet(opcode, packet, state)
+
+      :error ->
+        Logger.warning("Failed to read packet opcode")
+        state
+    end
+  end
+
+  defp dispatch_packet(_opcode, _packet, state) do
+    # TODO: Implement cash shop packet handlers
+    state
+  end
+
+  defp format_ip({a, b, c, d}) do
+    "#{a}.#{b}.#{c}.#{d}"
+  end
+
+  defp format_ip({a, b, c, d, e, f, g, h}) do
+    "#{a}:#{b}:#{c}:#{d}:#{e}:#{f}:#{g}:#{h}"
+  end
+end