# This program is a simple simulation of the racquetball game.

# Racquetball is a sport played between two players using racquets
# to strike a ball in a four-walled court.
# To start the game, one of the players puts the ball into play
# (called serving). The players then alternate hitting the ball
#to keep it in play. This is a rally. The rally ends when one of
# the players fails to hit a legal shot. The player who misses
# the shot loses the rally. If the loser is the player who served,
# then service passes to the other player.
# If the server wins the rally, a point is awarded.
# Players can only score points during their own service. 
# The first player to reach 15 points wins the game.
#
#
# Convention:
#               in our simulation the ability-level of players
#               will be represented by the probability that the
#               player wins the rally when he or she serves.
#
#   Pa – the probability that the player A wins on his/her serve
#   Pb – the probability that the player B wins on his/her serve
#
# Assumption:
#   in each game player A serves first

def main():
    Intro() # print an introduction
    answer = 'yes'
    while answer[0]=='y' or answer[0]=='Y':

        Pa, Pb, n = getInput() # getting input from the user
        print "The Player's A ability: %0.2f" % Pa
        print "The Player's B ability: %0.2f" % Pb
        print "The number of games to be simulated: %d" % n

        # simulating n games, returning the result of simulation
        WinsA, WinsB = simNgames(n,Pa,Pb)
    
        report(n,WinsA,WinsB) # reporting back to the user
        answer = raw_input("Another run? ")
    print "Have a good day!"

def Intro():
    print 'Hello, this is a simulation of the racquetball game'
    print 'This is a game for two players: Player A and Player B'    

def getInput():
    ProbA = input('Please, input  the probability that\n player A wins on his/her serve  (i.e. Ability-level):')

    ProbB = input('Please, input  the probability that\n player B wins on his/her serve  (i.e. Ability-level):')

    n = input('Input the number of games you\'d like to simulate:')

    return ProbA, ProbB, n

def report(n,wA,wB):
    print '%d games are simulated' % n
    
    PercentA = wA*100.0/n
    print 'Wins for Player A: %d (%0.1f%%)' %(wA,PercentA)
    
    PercentB = wB*100.0/n
    print 'Wins for Player B: %d (%0.1f%%)' %(wB,PercentB)

    print 'Have a good day!'

def simNgames(n,Pa,Pb):
    print "Entering simNgames...."
    
    WinsA=0
    WinsB=0

    for i in range(n):   # loop n times
        result=simOneGame(Pa,Pb) # simulate one game, get the result
        print "i=%d" %i
        if result==1: # Player A won
            WinsA=WinsA+1
        else: # Player B won
            WinsB=WinsB+1
            
    return WinsA, WinsB

def simOneGame(Pa,Pb):
    print "entering simOneGame..."

    from random import random
    serving='A'
    scoreA=0
    scoreB=0
    while scoreA<15 and scoreB<15:
        if serving == 'A':          # A is serving
            if random() < Pa:  # A wins the serve
                scoreA=scoreA+1     
            else:   # A loses the serve
                serving='B'         
        else:   # B is serving
            if random() < Pb:   # B wins the serve
                scoreB=scoreB+1
            else:   # B loses the serve
                serving='A'
        print "scoreA=%d, scoreB=%d" % (scoreA,scoreB)
    if scoreA == 15:
        print "Player A won this game"
        return 1
    elif scoreB == 15:
        print "Player B won this game"
        return 0
    else:
        print 'Something went wrong'
        print 'None of the players collected 15 points, but the rally is over'


main()