defmodule GSMLG.Mnesia.MnesiaException do
  alias __MODULE__

  # Don't raise this error manually, instead call `GSMLG.Mnesia.Error.normalize`
  # or `GSMLG.Mnesia.Error.raise_from` to raise these errors.

  defexception [:message, :data]

  @moduledoc false
  @newline "\n   "

  # Build the Exception struct
  def build(error) do
    message =
      "Mnesia operation failed" <>
        @newline <>
        info(error) <>
        @newline <>
        "Mnesia Error: " <> inspect(error)

    %MnesiaException{
      data: error,
      message: message
    }
  end

  # Fetch Mnesia's description of the error
  defp info({code, _, _}), do: info(code)
  defp info({code, _}), do: info(code)

  defp info(code) do
    desc = :mnesia.error_description(code)

    cond do
      is_list(desc) -> to_string(desc)
      true -> inspect(desc)
    end
  end
end