defmodule AugieWeb.CameraLive do
  use Phoenix.LiveView
  alias Augie.Sensor.Camera

  @moduledoc """
  A Liveview which streams images from the raspberry pi camera.
  """

  def render(assigns) do
    ~L"""
    <div class="card">
      <div class="card-divider">
        <h4>Camera</h4>
      </div>
      <img src="<%= @frame %>">
    </div>
    """
  end

  def mount(_params, _context, socket) do
    if connected?(socket), do: CommunityTheatre.subscribe(Camera, 4)

    jpg = Camera.last_frame(Camera)

    {:ok, assign(socket, frame: encode_frame(jpg))}
  end

  def handle_info({CommunityTheatre, %{topic: Camera, payload: jpg}}, socket) do
    {:noreply, assign(socket, frame: encode_frame(jpg))}
  end

  defp encode_frame(jpg) do
    [
      "data:image/jpeg;base64,",
      Base.encode64(jpg)
    ]
  end
end