sims

defmodule <%= inspect @module %> do
  @moduledoc false

  use Plug.Router, copy_opts_to_assign: :init_opts

  alias <%= inspect @simulator.namespace %>.StateServer
  alias <%= inspect @simulator.namespace %>.WebServer.Responses

  plug :unpack_opts
  plug :match
  plug :fetch_query_params

  plug Plug.Parsers,
    parsers: [:json],
    pass: ["*/*"],
    json_decoder: Jason
<%= if @simulator.options.response_stubs? do %>
  plug :return_stubbed_responses
<% end %>

  plug :dispatch

  defp unpack_opts(conn, _opts) do
    conn.assigns.init_opts
    |> Keyword.validate!([:state_server])
    |> then(&merge_assigns(conn, &1))
  end

  get "/hello"<%= if @simulator.options.response_stubs? do %>, assigns: %{endpoint_id: :greeting}<% end %> do
    greeting = StateServer.get_greeting(conn.assigns.state_server)

    send_resp(conn, 200, Responses.render_greeting(greeting))
  end
<%= if @simulator.options.response_stubs? do %>
  defp return_stubbed_responses(conn, _opts) do
    endpoint_id = fetch_endpoint_id_from_assigns!(conn)

    case StateServer.get_response_stub(conn.assigns.state_server, endpoint_id) do
      nil ->
        conn

      :internal_server_error ->
        conn
        |> send_resp(500, "Internal Server Error")
        |> halt()

      :invalid_response ->
        conn
        |> send_resp(200, "Invalid")
        |> halt()
    end
  end

  defp fetch_endpoint_id_from_assigns!(conn) do
    case Map.fetch(conn.assigns, :endpoint_id) do
      {:ok, endpoint_id} when is_atom(endpoint_id) ->
        endpoint_id

      _ ->
        path = Plug.Router.match_path(conn)
        method = conn.method |> to_string() |> String.downcase()

        raise """
        endpoint_id must be added to the assigns of the route definition

            #{method} #{inspect(path)}, assigns: %{endpoint_id: :my_endpoint_id} do
              #...
            end
        """
    end
  end
<% end %>
end