#!/usr/bin/python
import random
import sys
from sets import Set

gnames_file = "Given-Names.txt"
fnames_file = "Family-Names.txt"
eprovs_file = "Email-Providers.txt"

STOP_AFTER_FAILURES = 20 # stop after this number of failures

if len(sys.argv)!=2:
        print "Syntax: "+sys.argv[0]+" N"
	print "Generates a sorted list of N unique email adresses"
        exit()
N = int(sys.argv[1])

gnames = [line.strip() for line in open(gnames_file)]
fnames = [line.strip() for line in open(fnames_file)]
eprovs = [line.strip() for line in open(eprovs_file)]

# generate list of emails with N *unique* entries
emails = Set()
failures=0
while len(emails) < N:
        gname = random.choice(gnames)
        fname = random.choice(fnames)
        eprov = random.choice(eprovs)
        email=gname+'.'+fname+'@'+eprov
        if (email in emails):
                failures+=1
                if failures == STOP_AFTER_FAILURES:
                        exit("Failure: Unable to generate new unique email.")
        else:
                failures = 0
                emails.add(email)

# sort list of emails
emails_list = list(emails)
# emails_list.sort()
for e in emails_list:
     print e