//Revised CardList.Java


import java.util.Arrays;
import java.util.Random;

public class CardList {

    private char[] cards;
    private String history = "";

    public CardList(int numberOfCard)
    {
        deck = new char[numberOfCard];
        for (int i = 0; i<numberOfCard;i++)
        {
            Random r = new Random();
            int val = r.nextInt(13)+1;
            deck[i] = cardValue(val);
        }
        history += Arrays.toString(cards) + "\n";
    }

    public char cardValue(int val)
    {
        switch (val)
        {
            case(1):
                return 'A';
            case(2):
                return '2';
            case(3):
                return '3';
            case(4):
                return '4';
            case(5):
                return '5';
            case(6):
                return '6';
            case(7):
                return '7';
            case(8):
                return '8';
            case(9):
                return '9';
            case(10):
                return '0';
            case(11):
                return 'J';
            case(12):
                return 'Q';
            case(13):
                return 'K';
            default:
                return ' ';
        }
    }

    public void flip()
    {
        char[] newCard = new char[cards.length];

        int count = 0;
        for (int i = cards.length-1; i >= 0; i--)
        {
            newCard[count] = cards[i];
            count++;
        }

        history += Arrays.toString(newCard) + ": Flip\n";
        deck = newCard;
    }


    public void shift()
    {
        char[] newCard = new char[cards.length];

        for (int i = 0; i < cards.length; i++)
        {
            if (i == 0)
            {
                newCard[i] = cards[cards.length-1];
            } else {
                newCard[i] = cards[i-1];
            }
        }

        history += Arrays.toString(newCard) + ": Shift\n";
        deck = newCard;
    }

    public void shuffle()
    {
        int[] shuffleOrder = shuffleIndex();
        char[] newCards = new char[cards.length];

        for (int i = 0; i<shuffleOrder.length;i++)
        {
            newCards[i] = cards[shuffleOrder[i]];
        }

        history += Arrays.toString(newCards) + ": Shuffle\n";
        deck = newCards;
    }

    public void change(int num)
    {
        char[] newCards = new char[cards.length];
        for (int i = 0; i<num; i++)
        {
            if (i < cards.length)
            {
                Random r = new Random();
                int val = r.nextInt(13)+1;
                newCards[i] = cardValue(val);
            }
        }

        //size = 7
        //change = 2 (0,1,2)
        //remain = 5 -> (3,4,5,6)
        for (int i = 0; i < cards.length-num; i++)
        {
            newCards[i+num] = cards[i+num];
        }

        history += Arrays.toString(newCards) + ": Change\n";
        deck = newCards;
    }

    private int[] shuffleIndex()
    {
        int[] shuffled = new int[cards.length];
        for (int i = 0; i < cards.length; i++)
        {
            shuffled[i] = -1;
        }

        for (int i = 0; i < cards.length; i++)
        {
            boolean done = false;
            Random r = new Random();
            while (!done)
            {
                boolean contains = false;
                int val = r.nextInt(cards.length);
                for (int j = 0; j < shuffled.length; j++)
                {
                    if (shuffled[j] == val)
                    {
                        contains = true;
                    }
                }

                if (!contains)
                {
                    if (!(val == i))
                    {
                        shuffled[i] = val;
                        done = true;
                        break;
                    }
                }
            }
        }
        return shuffled;
    }

    public String getHistory()
    {
        return history;
    }

}