livebook/lib/livebook_web/live/user_helpers.ex

defmodule LivebookWeb.UserHelpers do
  use Phoenix.Component

  alias Livebook.Users.User

  @doc """
  Renders user avatar.

  ## Examples

      <.user_avatar user={@user} class="h-20 w-20" text_class="text-3xl" />
  """
  def user_avatar(assigns) do
    assigns =
      assigns
      |> assign_new(:class, fn -> "w-full h-full" end)
      |> assign_new(:text_class, fn -> "" end)

    ~H"""
    <div class={"#{@class} rounded-full flex items-center justify-center"} style={"background-color: #{@user.hex_color}"}>
      <div class={"#{@text_class} text-gray-100 font-semibold"}>
        <%= avatar_text(@user.name) %>
      </div>
    </div>
    """
  end

  defp avatar_text(nil), do: "?"

  defp avatar_text(name) do
    name
    |> String.split()
    |> Enum.map(&String.at(&1, 0))
    |> Enum.map(&String.upcase/1)
    |> case do
      [initial] -> initial
      initials -> List.first(initials) <> List.last(initials)
    end
  end

  @doc """
  Builds `Livebook.Users.User` using information from
  session and socket.

  Uses `user_data` from socket `connect_params` as initial
  attributes if the socket is connected. Otherwise uses
  `user_data` from session.
  """
  def build_current_user(session, socket) do
    %{"current_user_id" => current_user_id} = session

    connect_params = get_connect_params(socket) || %{}
    user_data = connect_params["user_data"] || session["user_data"] || %{}

    case User.change(%{User.new() | id: current_user_id}, user_data) do
      {:ok, user} -> user
      {:error, _errors, user} -> user
    end
  end
end