invoicex

defmodule Invoicex.Document.Item do
  @moduledoc """
  Stores invoice item data.
  """

  use Ecto.Schema

  alias Ecto.Changeset
  alias Invoicex.Extra.{Money, Tax}

  @required_fields [:name, :order, :quantity]
  @fields [:description | @required_fields]

  embedded_schema do
    embeds_many(:taxes, Tax)
    embeds_one(:price, Money)
    field(:description, :string)
    field(:name, :string)
    field(:order, :integer)
    field(:quantity, :integer)
    timestamps()
  end

  @doc false
  def changeset(item \\ %__MODULE__{}, attrs \\ %{}) do
    item
    |> Changeset.cast(attrs, @fields)
    |> Changeset.cast_embed(:price, required: true)
    |> Changeset.cast_embed(:taxes)
    |> Changeset.validate_number(:order, greater_than: 0)
    |> Changeset.validate_number(:quantity, greater_than: 0)
    |> Changeset.validate_required(@required_fields)
  end
end