import urllib, re, mechanize
from calibre.web.feeds.recipes import BasicNewsRecipe
from calibre import __appname__

class GoogleReader(BasicNewsRecipe):
    title   = 'Google Reader'
    description = 'This recipe fetches from your Google Reader account unread Starred items and unread Feeds you have placed in a folder via the manage subscriptions feature.'
    needs_subscription = True
    __author__ = 'davec, rollercoaster, Starson17'
    base_url = 'http://www.google.com/reader/atom/'
    oldest_article = 365
    max_articles_per_feed = 250
    get_options = '?n=%d&xt=user/-/state/com.google/read' % max_articles_per_feed
    use_embedded_content = True

    def get_browser(self):
        br = BasicNewsRecipe.get_browser(self)
        if self.username is not None and self.password is not None:
            request = urllib.urlencode([('Email', self.username), ('Passwd', self.password),
                                        ('service', 'reader'), ('accountType', 'HOSTED_OR_GOOGLE'), ('source', __appname__)])
            response = br.open('https://www.google.com/accounts/ClientLogin', request)
            auth = re.search('Auth=(\S*)', response.read()).group(1)
            cookies = mechanize.CookieJar()
            br = mechanize.build_opener(mechanize.HTTPCookieProcessor(cookies))
            br.addheaders = [('Authorization', 'GoogleLogin auth='+auth)]
        return br

    def get_feeds(self):
        feeds = []
        soup = self.index_to_soup('http://www.google.com/reader/api/0/tag/list')
        for id in soup.findAll(True, attrs={'name':['id']}):
            url = id.contents[0]
            feeds.append((re.search('/([^/]*)$', url).group(1),
                          self.base_url + urllib.quote(url.encode('utf-8')) + self.get_options))
        return feeds
