sleeky

defmodule Sleeky.Endpoint do
  @moduledoc """
  A simple helper macro that sets up a bandit listener plugged to a router.

  Usage:

  ```
  defmodule MyApp.Endpoint do
    use Sleeky.Endpoint,
      otp_app: :my_app,
      router: MyApp.Router
  end
  ```

  All options supported by Bandit can be provided via config, eg:

  ```
  config :my_app, MyApp.Endpoint,
    scheme: :http,
    port: 8080
  ```
  """

  defmacro __using__(opts) do
    otp_app = Keyword.fetch!(opts, :otp_app)
    router = Keyword.fetch!(opts, :router)

    quote do
      @doc false
      def child_spec(_) do
        Supervisor.child_spec(
          {Bandit,
           unquote(otp_app)
           |> Application.fetch_env!(__MODULE__)
           |> Keyword.put(:plug, unquote(router))},
          []
        )
      end
    end
  end
end