defmodule MavuList.Ash do
  if Code.ensure_loaded?(Ash) do
    def get_filterform_module(_listconf) do
      MyAppBe.MavuListAshfilter.FilterForm
    end

    def get_ash_filter_form(%MavuList{conf: conf, tweaks: tweaks} = list) do
      if is_nil(conf[:ash_resource]) do
        raise "MavuList config should contain an 'ash_resource' entry"
      end

      if is_nil(conf[:ashfilter_conf]) do
        raise "MavuList config should contain an 'ashfilter_conf' entry"
      end

      get_filterform_module(conf).new(conf[:ash_resource],
        params: tweaks[:ash_filterform] || %{},
        mavu_list: list
      )
    end

    def apply_ash_filterform(
          %Ash.Query{} = query,
          list = %MavuList{conf: conf, tweaks: %{ash_filterform: filterform_params}}
        ) do
      filter_form =
        get_filterform_module(conf).new(conf[:ash_resource],
          mavu_list: list,
          params: filterform_params || %{}
        )

      case get_filterform_module(conf).filter(query, filter_form) do
        {:ok, modified_query} ->
          modified_query

        {:error, _filter_form} ->
          query
      end
    end

    def autoload_fields(
          %Ash.Query{} = query,
          list = %MavuList{conf: conf}
        ) do
      filter_form =
        get_filterform_module(conf).new(conf[:ash_resource],
          mavu_list: list,
          params: %{}
        )

      case get_filterform_module(conf).autoload_fields(query, filter_form) do
        {:ok, modified_query} ->
          modified_query

        {:error, _filter_form} ->
          query
      end
    end
  end

  def apply_ash_filterform(source, _mavu_list) do
    source
  end

  def autoload_fields(source, _mavu_list) do
    source
  end
end