defmodule Garuda.GameSocket do
  @moduledoc """
  Defines specific game behaviours over `Phoenix.Socket`

  GameSocket extends `Phoenix.Socket` with extra game behaviours.

  ## Using GameSocket
  In `user_socket.ex`, we can do
      defmodule TictactoePhxWeb.UserSocket do
        use Garuda.GameSocket

        game_channel "tictactoe", TictactoePhxWeb.TictactoeChannel, TictactoePhx.TictactoeRoom

      end

  You might have noticed that instead of `use Phoenix.Socket`, we are using `Garuda.GameSocket` and instead of
  `channel`, we are using `game_channel`.
  """

  defmacro __using__(_opts \\ []) do
    quote do
      import unquote(__MODULE__)
      use Phoenix.Socket
      Phoenix.Socket.channel("garuda_matchmaker:*", Garuda.MatchMakerChannel)

      def connect(params, socket, _connect_info) do
        socket =
          Map.put(socket, :serializer, Garuda.Utils.MsgpaxSerializer)
          |> assign(:player_id, params["playerId"])

        {:ok, socket}
      end

      def id(socket), do: "users_socket:#{socket.assigns.player_id}"
    end
  end

  @doc """
  Defines a game-channel and corresponding game-room name.
    * `channel_name` - A game-channel name as string, ex "tictactoe"
    * `channel_module` - The game-channel module handler, ex `TictactoePhxWeb.TictactoeChannel`
    * `game_room_module` - The game-room module handler, where core game logic resides, ex `TictactoePhx.TictactoeRoom`

  ## Example
      game_channel "tictactoe", TictactoePhxWeb.TictactoeChannel, TictactoePhx.TictactoeRoom
  """
  defmacro game_channel(channel_name, channel_module, room_module) do
    quote do
      Phoenix.Socket.channel("room_" <> unquote(channel_name) <> ":*", unquote(channel_module),
        assigns: %{"#{unquote(channel_name)}_room_module" => unquote(room_module)}
      )
    end
  end
end