defmodule Memorex.DeckStats do
  @moduledoc """
  A struct which contains various counts for a `Memorex.Domain.Deck`.
  """

  alias Memorex.Cards
  alias Memorex.Ecto.Schema

  @type t :: %__MODULE__{
          total: non_neg_integer(),
          new: non_neg_integer(),
          learn: non_neg_integer(),
          review: non_neg_integer(),
          due: non_neg_integer(),
          suspended: non_neg_integer()
        }

  defstruct [:total, :new, :learn, :review, :due, :suspended]

  @spec new(Schema.id(), DateTime.t()) :: t()
  def new(deck_id, time_now) do
    %__MODULE__{
      total: Cards.count(deck_id),
      new: Cards.count(deck_id, card_type: :new),
      learn: Cards.count(deck_id, card_type: :learn),
      review: Cards.count(deck_id, card_type: :review),
      due: Cards.due_count(deck_id, time_now),
      suspended: Cards.count(deck_id, card_status: :suspended)
    }
  end
end