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  defp deps do
    [
      {:phoenix_live_session, "~> 0.1"} # Add phoenix_live_session
    ]
  end

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@session_options [
    store: PhoenixLiveSession,
    pub_sub: MyApp.PubSub,
    signing_salt: "your-salt",
]

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  # 初期接続
  def mount(_params, session, socket) do
    # セッションの確認
    IO.inspect(session)

    # 各初期値を取得（ atom で入れても session 上では文字列にされるので注意
    light_bulb_status = Map.get(session, "light_bulb_status", "off")
    on_button_status = Map.get(session, "on_button_status", "")
    off_button_status = Map.get(session, "off_button_status", "disabled")

    # 初期値の確認
    IO.inspect(light_bulb_status)
    IO.inspect(on_button_status)
    IO.inspect(off_button_status)

    socket =
      socket
      |> assign(:light_bulb_status, light_bulb_status)
      |> assign(:on_button_status, on_button_status)
      |> assign(:off_button_status, off_button_status)
      # セッションの共有
      |> PhoenixLiveSession.maybe_subscribe(session)

    {:ok, socket}
  end

  # 画面
  def render(assigns) do
    ~L"""
    <h1>The light is <%= @light_bulb_status %>.</h1>
    <button phx-click="on" <%= @on_button_status %>>On</button>
    <button phx-click="off" <%= @off_button_status %>>Off</button>
    """
  end

  # Onボタンの処理
  def handle_event("on", _value, socket) do
    socket =
      socket
      |> assign(:light_bulb_status, "on")
      |> assign(:on_button_status, "disabled")
      |> assign(:off_button_status, "")
      # セッションに保存
      |> PhoenixLiveSession.put_session(:light_bulb_status, "on")
      |> PhoenixLiveSession.put_session(:on_button_status, "disabled")
      |> PhoenixLiveSession.put_session(:off_button_status, "")

    {:noreply, socket}
  end

  # Offボタンの処理
  def handle_event("off", _value, socket) do
    socket =
      socket
      |> assign(:light_bulb_status, "off")
      |> assign(:on_button_status, "")
      |> assign(:off_button_status, "disabled")
      # セッションに保存
      |> PhoenixLiveSession.put_session(:light_bulb_status, "off")
      |> PhoenixLiveSession.put_session(:on_button_status, "")
      |> PhoenixLiveSession.put_session(:off_button_status, "disabled")

    {:noreply, socket}
  end
end

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sid = get_in(socket.private, [:live_session, :id])
opts = get_in(socket.private, [:live_session, :opts])
{sid, session} = PhoenixLiveSession.get(nil, sid, opts)