# Project Three MCS 260 due 22 October 2007
# 
# In what follows below, the user of the program is called
# the player, and our friend the computer is named the dealer.
# The rules of our simplified blackjack game are
# (1) A random number between 1 and 11 is given
#     to the dealer and player in each round.
# (2) No more cards are dealt if the value of the hand
#     of either dealer or player is equal to 21 or more.
# (3) The player can choose to take another card
#     or to the end the game.
# (4) The hand of the dealer is not shown until
#     the dealing of cards has ended.
# (5) At the end of the game the hands of player
#     and dealer are compared to see who wins.
# A player whose value of the hand exceeds 21 is busted
# and we will call it a blackjack if the value equals 21.
# The rules to decide who wins are
# (1) At a tie, the hands of both dealer and player
#     have the same value, or if both are busted.
# (2) The player has a winning hand if its value is less 
#     than or equal to 21 and it is higher than the value
#     of the hand of the dealer or the dealer is busted.
# (3) The player loses in all other cases.
# After reporting the outcome of each game (win, tie, or loss),
# the user is prompted the question "another game? (y/n) " and
# the program then continues if 'y' answers the question.
# At the very end of the program, the total tally of wins, ties,
# and losses is printed to the screen.
#
def play ( hand, sumhand ):
   "evaluates hand and returns boolean stop"
   print 'hand =', hand, 'sum = ', sumhand
   y_or_n = raw_input('another card ? (y/n) ')
   stop = (y_or_n != "y")
   return stop

def show_hands ( deal, hand, sumdeal, sumhand ):
   "returns two strings to show hands of dealer and player"
   ps1 = 'dealers hand = ' + str(deal) + ' sum = ' + str(sumdeal)
   ps2 = 'players hand = ' + str(hand) + ' sum = ' + str(sumhand)
   if sumdeal == 21: ps1 += ' blackjack'
   elif sumdeal > 21: ps1 += ' busted'
   if sumhand == 21: ps2 += ' blackjack'
   elif sumhand > 21: ps2 += ' busted'
   return (ps1,ps2)

def compare ( deal, hand, sumdeal, sumhand ):
   "compares hand of dealer with player"
   (ps1,ps2) = show_hands(deal,hand,sumdeal,sumhand)
   if (sumdeal > 21 and sumhand > 21) or (sumdeal == sumhand):
      ps2 += ' tie'
      result = 0
   else:  # decide win or loss
      if sumhand == 21:
         ps2 += ' win'; result = +1
      elif sumhand < 21:
         if (sumdeal < sumhand) or (sumdeal > 21):
            ps2 += ' win'; result = +1
         else:
            ps2 += ' loss'; result = -1
      else:
         ps2 += ' loss'; result = -1
   print ps1 + '\n' + ps2
   return result

def update ( tally, score ):
   "updates the tally of wins, ties, and losses\
    with the score +1 (win), 0 (tie), or -1 (loss)"
   nt = tally
   if score == +1:
      nt[0] += 1
   elif score == 0:
      nt[1] += 1
   else:
      nt[2] += 1
   return nt

def main():
   import random
   print 'welcome to our simplified blackjack game'
   t = [0,0,0]  # wins, ties, and losses
   while True:
      hand = []; deal = []
      while True:
         hand.append(random.randint(1,11))
         deal.append(random.randint(1,11))
         sd = sum(deal); sh = sum(hand)
         if sd >= 21 or sh >= 21: break
         if play(hand,sh): break
      s = compare(deal,hand,sd,sh)
      t = update(t,s)
      if (raw_input('another game? (y/n) ') != 'y'): break
   print '#wins = %d, #ties = %d, #losses = %d' % (t[0],t[1],t[2])

main()