import os
import urllib
import urlparse
import re
import shelve
import sickbeard

from sickbeard import logger
from sickbeard import encodingKludge as ek
from sickbeard.exceptions import ex
from lib.feedcache import cache

class RSSFeeds:
    def __init__(self, db_name):
        try:
            self.fs = shelve.open(ek.ek(os.path.join, sickbeard.CACHE_DIR, db_name))
            self.fc = cache.Cache(self.fs)
        except Exception, e:
            logger.log(u"RSS error: " + ex(e), logger.ERROR)
            raise

    def __del__(self):
        if getattr(self, "fs", None) is not None:
            self.fs.close()

    def clearCache(self, age=None):
        self.fc.purge(age)

    def getFeed(self, url, post_data=None, request_headers=None):
        parsed = list(urlparse.urlparse(url))
        parsed[2] = re.sub("/{2,}", "/", parsed[2])  # replace two or more / with one

        if post_data:
            url += urllib.urlencode(post_data)

        feed = self.fc.fetch(url, False, False, request_headers)

        if not feed:
            logger.log(u"RSS Error loading URL: " + url, logger.ERROR)
            return
        elif 'error' in feed.feed:
            logger.log(u"RSS ERROR:[%s] CODE:[%s]" % (feed.feed['error']['description'], feed.feed['error']['code']),
                       logger.DEBUG)
            return
        elif not feed.entries:
            logger.log(u"No RSS items found using URL: " + url, logger.WARNING)
            return

        return feed