# -*- coding: utf-8 -*-
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import webapp
from google.appengine.api import urlfetch
from appengine_utilities import sessions
from appengine_utilities import cache
import logging, cgi, datetime
import templates
import feedparser

class GetFeed(webapp.RequestHandler):
    def get(self):
    	self.cache = cache.Cache()
    	finaloutput = None
    	try:
            finaloutput = self.cache['javascriptoutput']
	    logging.debug("Javascript output cache hit")
        except:
            logging.debug("Javascript output cache miss")
            finaloutput = ""
            feed_url = "http://www.centrical.com/feeds/posts/default?alt=rss"
            
            try:
                feedinput = self.cache['feedinput']
                logging.debug("Feed input cache hit")
            except:
                logging.debug("Feed input cache miss")
                try:
                    feedinput = urlfetch.fetch(feed_url)
                    self.cache['feedinput'] = feedinput
                except:
                    raise Exception("Can not retrieve feedinput URL.")

            d = feedparser.parse(feedinput.content)
            if d.bozo == 1:
                raise Exception("Can not parse given URL.")
            
            contents = ""
            
            for entry in d.entries[:5]:
                contents += templates.contents % dict(link=cgi.escape(entry.link),
                                                  title=cgi.escape(entry.title))

            finaloutput += templates.read_html % dict(feed_url=cgi.escape(feed_url), contents=contents)

            self.cache['javascript'] = finaloutput
            
	expires_date = datetime.datetime.utcnow() + datetime.timedelta(1)
        self.response.headers["Content-Type"] = 'application/x-javascript'
        self.response.headers.add_header("Expires", expires_date.strftime("%d %b %Y %H:%M:%S GMT"))
	self.response.out.write(self.cache['javascript'])

	
application = webapp.WSGIApplication([('/', GetFeed)], debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()