import re
import praw
import pickle
import atexit
import time
import os.path
import sys
import OAuth2Util

#initial setup

r = praw.Reddit('Hitlerv2')
o = OAuth2Util.OAuth2Util(r)
o.refresh(force=True)

pickle_file = "save.p"

subreddit = r.get_subreddit('all')
if os.path.isfile(pickle_file):
	searched = pickle.load( open( pickle_file, "rb" ))
else:
	searched = set()


def dumpComments():
	"""
	On program crash or exit.
	"""

	print("HELP")
	if os.path.isfile(pickle_file): #if file exists
		os.remove(pickle_file) #deletes existing pickle file
	pickle.dump(searched, open( pickle_file, "wb" )) #dump set() with comment ids into pickle
	sys.exit()

def stopTimer(start):
	elapsed = time.time() - start
	return(elapsed)
start = time.time()


#Main loop
while True:
	try:
		sub_comments = subreddit.get_comments(limit=200) #fetch comments from r/all
		for comment in sub_comments:
			if comment.id not in searched:
				searched.add(comment.id) #add the comment id to the log
				if "hitler" in comment.body.lower():
					print(comment.body)

					m, s = divmod(int(round(stopTimer(start))), 60)
					h, m = divmod(m, 60)
					start = time.time()
					comment.reply("Way to go, Reddit was Hitler free for " + str(h) + " hours " + str(m) + " minutes " + str(s) + " seconds")
		time.sleep(1)
	except Exception,e:
		print(e)
		continue


atexit.register(dumpComments)