defmodule CustomerServiceWeb.Plugs.ExtractOrganizationId do
  @moduledoc """
  Extract `X-Organization-Id` request header.

  Stores the organization identifier in conn.private[__MODULE__] for downstream authorization checks.
  """

  @behaviour Plug

  import Plug.Conn, only: [get_req_header: 2, put_private: 3]

  @impl Plug
  def init(_opts), do: %{}

  @impl Plug
  def call(conn, _opts) do
    case get_req_header(conn, "x-organization-id") do
      [org_id | _rest] -> put_private(conn, __MODULE__, org_id)
      [] -> put_private(conn, __MODULE__, nil)
    end
  end
end