# Q-12 MCS 275 Tue 6 Apr 2010 : quiz12a.py

# We simulate a particular card came representing the
# 4 players by threads 0, 1, 2, and 3.
# The are four cards, labeled A, B, C, and D,
# distributed so each player has exactly one card.  
# The cards are shuffled before distributing to the four players.

# The game is played as follows.  First the player who holds card A
# puts the card on the table.  Then comes the player with card B,
# followed by the player with C, and then finally card D is
# shown by the player who holds it.  The shared variable between the
# players is a list with those cards currently on the table.
# Players check the cards on the table and print their name when
# it is their turn to put their card on the table.

# 1. Write the code for the main program that sets up
#     and simulates the game.

# 2. Write the code for the {\tt run} in a Player thread.

from threading import *
import time
import random

class Player(Thread):
   """
   simulating one round in card game
   """
   def __init__(self,n,t,c):
      """
      Initializes player with name n,
      the table t, and card c.
      """
      Thread.__init__(self,name=n)
      print 'player ' + n + ' is born'
      self.t = t
      self.c = c

   def run(self):
      """
      players put cards down in turn
      """
      s = self.getName()
      if self.c == 'A':
         self.t.append('A')
         print 'table :', self.t
      else:
         print 'player %s waits ...' % s
         done = False
         while True:
            time.sleep(1)
            if len(self.t) > 0:
               last = self.t[len(self.t)-1]
               if chr(ord(self.c)-1) == last:
                  self.t.append(self.c)
                  print 'table :', self.t
                  done = True
            if done: break
      print 'player %s has %s' % (s,self.c)
     
def main():
   """
   Deals the cards
   and starts the simulation.
   """
   L = ['A','B','C','D']
   random.shuffle(L)
   table = []
   T = []
   for i in range(0,4):
      T.append(Player(str(i),table,L[i]))
   print 'starting the game'
   for t in T: t.start()
   print 'game has started'

if __name__ == "__main__": main()