defmodule CoreUtils.StructUtil do
  @exceptions [NaiveDateTime, DateTime]
  @bloat [
    :__meta__,
    :__struct__,
    :__cardinality__,
    :__field__,
    :__owner__,
    Ecto.Association.NotLoaded
  ]

  def nested_parse(list) when is_list(list) do
    Enum.map(list, &nested_parse/1)
  end

  def nested_parse(%{__struct__: Core.Models.Task} = struct) do
    struct = if struct.geom do
        {lon, lat} = struct.geom.coordinates
        %{struct | lon: lon, lat: lat}
      else
        struct
      end
    nested_parse(Map.from_struct(struct))
  end

  def nested_parse(schema) when is_map(schema) do
    schema
    |> Map.take(Map.keys(schema) -- @bloat)
    |> Enum.filter(fn
      {_, %Ecto.Association.NotLoaded{}} -> false
      _ -> true
    end)
    |> Enum.map(&nested_parse/1)
    |> Enum.into(%{})
  end

  def nested_parse({key, %{__struct__: struct} = val})
      when struct in @exceptions,
      do: {key, val}

  def nested_parse({key, val}) when is_map(val) or is_list(val) do
    {key, nested_parse(val)}
  end

  def nested_parse(data), do: data
end