defmodule Plausible.Billing.Ecto.Limit do
  @moduledoc """
  Ecto type representing a limit, that can be either a number or unlimited.
  Unlimited is dumped to the database as `-1` and loaded as `:unlimited` to
  keep compatibility with the rest of the codebase.
  """

  use Ecto.Type

  def type, do: :integer

  def cast(-1), do: {:ok, :unlimited}
  def cast(:unlimited), do: {:ok, :unlimited}
  def cast("unlimited"), do: {:ok, :unlimited}
  def cast(other), do: Ecto.Type.cast(:integer, other)

  def load(-1), do: {:ok, :unlimited}
  def load(other), do: Ecto.Type.load(:integer, other)

  def dump(:unlimited), do: {:ok, -1}
  def dump(other), do: Ecto.Type.dump(:integer, other)
end