defmodule ExShopifySchema.Graphql.JSON do
  @moduledoc "A [JSON](https://www.json.org/json-en.html) object.\n\nExample value:\n`{\n  \"product\": {\n    \"id\": \"gid://shopify/Product/1346443542550\",\n    \"title\": \"White T-shirt\",\n    \"options\": [{\n      \"name\": \"Size\",\n      \"values\": [\"M\", \"L\"]\n    }]\n  }\n}`\n"

  @type t() :: map()

  use Ecto.Type

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

  @impl Ecto.Type
  def cast(nil), do: {:ok, nil}

  def cast(json) when is_binary(json) do
    case Jason.decode(json) do
      {:ok, map} = ok when is_map(map) -> ok
      _other -> :error
    end
  end

  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(map) when is_map(map) do
    case Jason.encode(map) do
      {:ok, _json} = ok -> ok
      _other -> :error
    end
  end

  def dump(_data), do: :error
end