#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os, tweepy, calendar, datetime, itertools, sys, time, random

max_length = 14
cke = "Consumer Key"
cse = "Consumer Secret"
ato = "Access Token"
ase = "Access Secret"

allowedchars = "1234567890abcdefghijklmnopqrstuvwxyz_"

tmpfile = "tmp"
bot_path = os.path.dirname(os.path.abspath(__file__))
id_file = os.path.join(bot_path, tmpfile)

auth = tweepy.OAuthHandler(cke, cse)
auth.set_access_token(ato, ase)
api = tweepy.API(auth)

chars = list(allowedchars)

try:
 with open(id_file, "r") as file:
  current = list(file.read())
  if current[-1] == '\n':
   del current[-1]
except IOError:
 print "No savepoint found. Starting from the top."
 current = []

def tweet(word):
 greeting = random.randint(1,3)
 if greeting == 1:
  text = "Hi there, @%s, how are you?" % word
 elif greeting == 2:
  text = "Hello @%s! Have a nice day!" % word
 else:
  text = "How are you doing, @%s?" % word
 try:
  api.update_status(text.encode('utf-8'))
  print text
 except tweepy.error.TweepError, e:
   print "Tweet failed: " + word
   print e

def nexttweet(offset = 1):
 global current
 if offset > len(current):
  current = [chars[0]] + current
 elif current[-offset] == chars[-1]:
  current[-offset] = chars[0]
  nexttweet(offset + 1)
 else:
  current[-offset] = chars[chars.index(current[-offset]) + 1]

while len(current) <= max_length:
 nexttweet()
 try:
  api.get_user("".join(current))
  tweet("".join(current))
  with open(id_file, "w") as file:
   file.write("".join(current))
  time.sleep(60)
 except tweepy.error.TweepError, e:
  print "User does not exist: " + "".join(current)