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

public class Deck {
    private ArrayList<Card> cards;

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

    public ArrayList<Card> getCards() {
        return cards;
    }

    public Card deal() {
        return cards.remove(0);
    }

    public int getScore() {
        int points = 0;
        for (Card c : cards) {
            switch (c.getValue()) {
                case 1:
                    // an ace counts as 11 by default
                    points += 11;
                    break;
                case 11:
                case 12:
                case 13:
                    // face cards count as 10
                    points += 10;
                    break;
                default:
                    points += c.getValue();
            }
        }

        // try to lower score with aces going 11->1
        if (points > 21) {
            for (Card c : cards) {
                if (c.getValue() == 1) {
                    points -= 10;
                    if (points <= 21) {
                        break;
                    }
                }
            }
        }

        return points;
    }

    public void buildStandardDeck() {
        for (Suit s : Suit.values()) {
            for (int val = 1; val <= 13; val++) {
                cards.add(new Card(s, val));
            }
        }
    }

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

        ArrayList<Card> newCards = new ArrayList<>();

        while (!cards.isEmpty()) {
            // pick random card from orginal deck
            int index = rng.nextInt(cards.size());
            Card c = cards.remove(index);
            newCards.add(c);
        }

        cards = newCards;
    }

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