defmodule TwitchApi.ApiJson.Template.ModuleDoc do
  @moduledoc """
  Provides the module doc template for a twitch api item module
  """
  alias TwitchApi.ApiJson.Item

  @doc """
  Creates a twitch api Elixir module doc template
  """
  @spec create_moduledoc(Item.t()) :: binary
  def create_moduledoc(item) do
    request_doc = get_request_doc(item)
    response_doc = get_response_doc(item)

    """
    @moduledoc \"\"\"
      ⛔ This module is autogenerated please do not modify manually.

      ## Example request from twitch api docs:
      #{request_doc}
      ## Example response from twitch api docs:
      #{response_doc}
      \"\"\"
    """
  end

  defp get_request_doc(item) do
    descriptions = join_doc_items(item.doc.requests.descriptions)
    requests = join_doc_items(item.doc.requests.requests)

    """
    ### descriptions:
      #{descriptions}
      ### requests:
      #{requests}
    """
  end

  defp get_response_doc(item) do
    descriptions = join_doc_items(item.doc.responses.descriptions)
    responses = join_doc_items(item.doc.responses.responses)

    """
    ### descriptions:
      #{descriptions}
      ### responses:
      #{responses}
    """
  end

  defp join_doc_items(items) do
    items
    |> Enum.map(fn item -> String.replace(item, "\n", "\n  ") end)
    |> Enum.map(fn item -> String.replace(item, "\n  }", "\n   }") end)
    |> Enum.map_join(&(&1 <> "\n  "))
  end
end