# 6.00 Problem Set 8
# RSS Feed Reader, Part II

##############################################################
##
## Please duplicate your ps7 NewsStory class
## process, and printStories below.
##
##############################################################
import feedparser
import string
import time
from project_util import translate_html

# TODO: Your PS7 code here

#printStories(process("http://news.google.com/?output=rss", GOOGLE))
#printStories(process("http://rss.news.yahoo.com/rss/topstories", YAHOO))

#-----------------------------------------------------------------------
#
# Problem Set 8
#======================
# Part 1
# Trigger Definitions 
#======================

class Trigger:
    def evaluate(self, story):
        return True

# Whole Word Triggers
# Questions 1-3

# TODO: TitleTrigger
# TODO: SubjectTrigger
# TODO: SummaryTrigger


# Composite Triggers
# Questions 4-6

# TODO: NotTrigger
# TODO: AndTrigger
# TODO: OrTrigger

# Phrase Trigger
# Question 7

# TODO: PhraseTrigger


#======================
# Part 2
# Tying it all together
#======================

def filter(stories, triggerlist):
    """
    Takes in a list of NewsStory-s.
    Returns ony those stories for whom
    a trigger in triggerlist fires.
    """
    # TODO: Question 8
    return []

def readTriggerConfig(filename):
    """
    Returns a list of trigger objects
    that correspond to the rules set
    in the file filename
    """
    # Here's some code that we give you
    # to read in the file and eliminate
    # blank lines and comments
    triggerfile = open(filename, "r")
    all = [ line.rstrip() for line in triggerfile.readlines() ]
    lines = []
    for line in all:
        if len(line) == 0 or line[0] == '#':
            continue
        lines.append(line)
    
    # TODO: Question 10
    # 'lines' has a list of lines you need to parse
    # Build a set of triggers from it and
    # return the appropriate ones

    
SLEEPTIME = 60 #seconds -- how often we poll
if __name__ == '__main__':
    # A sample trigger list - you'll replace
    # this with something more configurable in Question 10
    t1 = SubjectTrigger("sports")
    t2 = SummaryTrigger("Obama")
    t3 = PhraseTrigger("Hillary Clinton")
    t4 = OrTrigger(t2, t3)
    triggerlist = [t1, t4]
    
    # TODO: Question 10
    # After implementing readTriggerConfig, uncomment this line 
    # triggerlist = readTriggerConfig("triggers.txt")
    
    while True:
        #print "Polling..."
        stories = process("http://news.google.com/?output=rss", GOOGLE)
        stories.extend(process("http://rss.news.yahoo.com/rss/topstories", YAHOO))

        # Only select stories we're interested in
        # TODO: Question 8
    
        # Don't print a story if we already have
        # TODO: Question 9

        printStories(stories)

        #print "Sleeping..."
        time.sleep(SLEEPTIME)