import java.util.ArrayList;
import java.util.Random;

public class Deck {
    private ArrayList<Card> cards;
    private static final String[] values = {"2", "3", "4", "5", "6", "7",
        "8", "9", "10", "Jack", "Queen", "King", "Ace"};

    public Deck() {
        cards = new ArrayList<>();
    }

    public void buildStandardDeck() {
        for (Suit s : Suit.values()) {
            for (String val : values) {
                cards.add(new Card(s, val));
            }
        }
    }

    // remove one card from deck and return it
    public Card deal() {
        if (cards.isEmpty()) {
            throw new IllegalStateException("Cannot deal from empty deck");
        }

        Card c = cards.remove(0);
        return c;
    }

    // add a card into the deck
    public void add(Card c) {
        cards.add(0, c);
    }

    public void shuffle() {
        Random rng = new Random();

        for (int i = 0; i < cards.size() * 10; i++) {
            int index = rng.nextInt(cards.size());
            Card c = cards.remove(index);

            index = rng.nextInt(cards.size());
            cards.add(index, c);
        }
    }

    public Card get(int index) {
        return cards.get(index);
    }

    public void print() {
        for (Card c : cards) {
            System.out.println(c);
        }
    }
}