ex_shopify_schema

defmodule ExShopifySchema.Graphql.ID do
  @moduledoc "Represents a unique identifier, often used to refetch an object.\nThe ID type appears in a JSON response as a String, but it is not intended to be human-readable.\n\nExample value: `\"gid://shopify/Product/10079785100\"`\n"

  @type t() :: String.t()

  use Ecto.Type

  @impl Ecto.Type
  def type, do: :string

  @impl Ecto.Type
  def cast(nil), do: {:ok, nil}
  def cast(id) when is_binary(id), do: {:ok, id}
  def cast(_data), do: :error

  @impl Ecto.Type
  def load(data), do: cast(data)

  @impl Ecto.Type
  def dump(nil), do: {:ok, nil}
  def dump(id) when is_binary(id), do: {:ok, id}
  def dump(_data), do: :error

  @doc """
  Converts a Shopify Global ID (GID) to an integer.
  The GID is expected to be in the format "gid://shopify/<resource_type>/<id>".

  ## Examples

      iex> ExShopifySchema.Graphql.ID.to_integer!("gid://shopify/Product/123456789")
      123456789
  """
  @spec to_integer!(String.t()) :: integer()
  def to_integer!("gid://shopify/" <> resource_parts) do
    [_resource_type, id] = String.split(resource_parts, "/")

    String.to_integer(id, 10)
  end
end