# Deck.py

from random import randrange
from Card import Card
  
class Deck(object):

    #------------------------------------------------------------

    def __init__(self):

        """post: Creates a 52 card deck in standard order"""

        cards = []
        for suit in Card.SUITS:
            for rank in Card.RANKS:
                cards.append(Card(rank,suit))
        self.cards = cards

    #------------------------------------------------------------

    def size(self):

        """Cards left
        post: Returns the number of cards in self"""

        return len(self.cards)

    #------------------------------------------------------------

    def deal(self):

        """Deal a single card
        pre:  self.size() > 0
        post: Returns the next card in self, and removes it from self.""" 

        return self.cards.pop()

    #------------------------------------------------------------

    def shuffle(self):

        """Shuffles the deck
        post: randomizes the order of cards in self"""

        n = self.size()
        cards = self.cards
        for i,card in enumerate(cards):
            pos = randrange(i,n)
            cards[i] = cards[pos]
            cards[pos] = card