private DateTime CardReviewDate(Flashcard card)
{
int gap = CardReviewDaysGap(card);
if (gap == 0)
{
return(card.dt_last_review == null ? _now : card.dt_last_review.Value.AddDays(1));
}
return(card.dt_last_review.Value.AddDays(gap));
}
private int CardReviewDaysGap(Flashcard card)
{
// level 0: every day
// level 1: every 2 day
// level 2: every 4 day
// level 3: every 8 day
// level 4: every 16 day
// level 5: every 32 day
if (card.level == 0)
{
return(0);
}
return((int)Math.Pow(2, card.level));
}
public void AddCard(string front, string back)
{
var card = new Flashcard()
{
front = front,
back = back,
level = 0
};
_db_cards.Insert(card);
var deck = _db_decks.FindAll().First();
deck.cards.Add(card);
_db_decks.Update(deck);
}