defmodule EslHnWeb.API.Controller do
  @moduledoc """
  Controller for serving HN top stories cache
  """

  use EslHnWeb, :controller

  def index(conn, params) do
    page = get_page(params["page"])

    render(conn, items: EslHn.all(page))
  end

  def show(conn, %{"id" => id}) do
    with {:ok, id} <- try_int(id),
         {:ok, story} <- EslHn.story(id) do
      render(conn, item: story)
    else
      _ ->
        conn
        |> put_status(:not_found)
        |> put_view(EslHnWeb.Error.JSON)
        |> render(:"404", %{})
    end
  end

  defp get_page(nil), do: 1

  defp get_page(input) do
    String.to_integer(input)
  end

  defp try_int(value) do
    case Integer.parse(value) do
      {int, ""} -> {:ok, int}
      _ -> :error
    end
  end
end