defmodule Braintree.AddOn do
  @moduledoc """
  Add-ons and discounts are created in the Control Panel. You cannot create or
  update them through the API.

  Add-ons and discounts can be applied manually on a case-by-case basis, or you
  can associate them with certain plans to apply them automatically to new
  subscriptions. When creating a subscription, it will automatically inherit
  any add-ons and/or discounts associated with the plan. You can override those
  details at the time you create or update the subscription.
  """

  use Braintree.Construction

  alias Braintree.ErrorResponse, as: Error
  alias Braintree.HTTP

  @type t :: %__MODULE__{
          id: String.t(),
          amount: String.t(),
          current_billing_cycle: integer,
          description: String.t(),
          kind: String.t(),
          name: String.t(),
          never_expires?: boolean,
          number_of_billing_cycles: integer,
          quantity: integer
        }

  defstruct id: nil,
            amount: 0,
            current_billing_cycle: nil,
            description: nil,
            kind: nil,
            name: nil,
            never_expires?: false,
            number_of_billing_cycles: 0,
            quantity: 0

  @doc """
  Returns a list of Braintree::AddOn structs.

  ## Example

      {:ok, addons} = Braintree.AddOns.all()
  """
  @spec all(Keyword.t()) :: {:ok, [t]} | {:error, Error.t()}
  def all(opts \\ []) do
    with {:ok, %{"add_ons" => add_ons}} <- HTTP.get("add_ons", opts) do
      {:ok, new(add_ons)}
    end
  end
end