import tweepy
import time
import os
print("this is my twitter bot")


#put your own developer keys here
CONSUMER_KEY = ''
CONSUMER_SECRET = ''
ACCESS_KEY = ''
ACCESS_SECRET = ''

auth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET)
auth.set_access_token(ACCESS_KEY, ACCESS_SECRET)
api = tweepy.API(auth)

FILE_NAME = 'last_seen_id.txt'


def retrieve_last_seen_id(file_name):
    f_read = open(file_name, 'r')
    last_seen_id = int(f_read.read().strip())
    f_read.close()
    return last_seen_id

def store_last_seen_id(last_seen_id, file_name):
    f_write = open(file_name, 'w')
    f_write.write(str(last_seen_id))
    f_write.close()
    return


def reply_to_tweets():
    print('retrieving and replying to tweets..')

    if os.stat(FILE_NAME).st_size == 0:
        last_seen_id='NULL'
        mentions = api.mentions_timeline(tweet_mode='extended')
    else:
        last_seen_id = retrieve_last_seen_id(FILE_NAME)
        mentions = api.mentions_timeline(last_seen_id,tweet_mode='extended')
    #mentions = api.mentions_timeline(last_seen_id,tweet_mode='extended')

    for mention in reversed(mentions):
        print (str(mention.id)+ "-" +mention.full_text)
        last_seen_id = mention.id
        if '#hitwitbit' in mention.full_text.lower():
            print('found #hitwitbit')
            print('respondig back...')
            api.update_status('@'+ mention.user.screen_name + "#HellofromTwitbit back to you!" , mention.id)

    store_last_seen_id(last_seen_id, FILE_NAME)

while True:
    reply_to_tweets()
    time.sleep(15)
