import os
from random import random
from gettext import gettext as _
 
MAXNUMBER = 1000000
 
class Renamer:
    def __init__(self, path, file_type, is_random):
        self.__count = 0
        self.__path = path
        self.__file_type = file_type
        self.__is_random = is_random
 
    def run(self):
        map(self.__rename_file, os.listdir(self.__path))
 
    def __rename_file(self, name):
        if name.endswith(self.__file_type):
            last_full_name = self.__path + name
            if self.__is_random:
                number = int(random() * MAXNUMBER)
            else:
                number = self.__count
                self.__count += 1
            new_full_name = "%s%d.%s" % (self.__path, number, name)
            os.rename(last_full_name, new_full_name)
            print "%s -> %s" % (last_full_name, new_full_name)
 
if __name__ == '__main__':
    import optparse
    parser = optparse.OptionParser(_('usage: %prog options'))
    parser.add_option('--path', '-p', default='./')
    parser.add_option('--file-type', '-f', default='')
    parser.add_option('--random', '-r', action="store_true")
    (options, args) = parser.parse_args()
    renamer = Renamer(options.path, options.file_type,  options.random)
    renamer.run()