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#! /usr/bin/env python
#-*- coding: utf-8 -*-

# pyAggr3g470r - A Web based news aggregator.
# Copyright (C) 2010-2014  Cédric Bonhomme - http://cedricbonhomme.org/
#
# For more information : https://bitbucket.org/cedricbonhomme/pyaggr3g470r/
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 2.0 $"
__date__ = "$Date: 2010/09/02 $"
__revision__ = "$Date: 2013/11/10 $"
__copyright__ = "Copyright (c) Cedric Bonhomme"
__license__ = "AGPLv3"

import urllib2
import requests
import threading
import feedparser
from datetime import datetime
from urllib import urlencode
from urlparse import urlparse, parse_qs, urlunparse
from BeautifulSoup import BeautifulSoup

from requests.exceptions import Timeout

from sqlalchemy.exc import IntegrityError

import models
import conf
#import search
import utils

if not conf.ON_HEROKU:
    from flask.ext.mail import Message
    from pyaggr3g470r import mail
    
from pyaggr3g470r import app, db
from pyaggr3g470r.models import User, Feed, Article

import log
pyaggr3g470r_log = log.Log("feedgetter")

list_of_threads = []

class FeedGetter(object):
    """
    This class is in charge of retrieving feeds listed in ./var/feed.lst.
    This class uses feedparser module from Mark Pilgrim.
    For each feed a new thread is launched.
    """
    def __init__(self, email):
        """
        Initializes the database connection.
        """
        feedparser.USER_AGENT = conf.USER_AGENT
        if conf.HTTP_PROXY == "":
            self.proxy = urllib2.ProxyHandler({})
            self.proxies = {}
        else:
            self.proxy = urllib2.ProxyHandler({"http" : conf.HTTP_PROXY, \
                                               "https": conf.HTTP_PROXY})
            self.proxies = {
                            "http": "http://" + conf.HTTP_PROXY,
                            "https": "http://" + conf.HTTP_PROXY
                           }
        feedparser.USER_AGENT = conf.USER_AGENT
        self.user = User.query.filter(User.email == email).first()

    def retrieve_feed(self, feed_id=None):
        """
        Parse the file 'feeds.lst' and launch a thread for each RSS feed.
        """
        feeds = [feed for feed in self.user.feeds if feed.enabled]
        if feed_id != None:
            feeds = [feed for feed in feeds if str(feed.id) == feed_id]
        for current_feed in feeds:
            try:
                # launch a new thread for the RSS feed
                thread = threading.Thread(None, self.process, \
                                           None, (current_feed, ))
                thread.start()
                list_of_threads.append(thread)
            except:
                pass

        # wait for all threads are done
        for th in list_of_threads:
            th.join()

    def process(self, feed):
        """
        Retrieves articles form the feed and add them to the database.
        """
        a_feed = feedparser.parse(feed.link, handlers = [self.proxy])
        if a_feed['entries'] == []:
            return

        # Feed informations
        if feed.title == "":
            try:
                feed.title = a_feed.feed.title
            except:
                feed.title = ""
        if feed.description == "":
            try:
                feed.description = a_feed.feed.subtitle
            except:
                feed.description = ""

        articles = []
        for article in a_feed['entries']:

            nice_url = article.link.encode("utf-8")
            if conf.RESOLVE_ARTICLE_URL:
                try:
                    # resolves URL behind proxies (like feedproxy.google.com)
                    r = requests.get(article.link, timeout=5.0, proxies=self.proxies)
                    nice_url = r.url.encode("utf-8")
                except Timeout:
                    pyaggr3g470r_log.warning("Timeout when getting the real URL of %s." % (article.link,))
                    continue
                except Exception as e:
                    pyaggr3g470r_log.warning("Unable to get the real URL of %s. Error: %s" % (article.link, str(e)))
                    continue
            # remove utm_* parameters
            parsed_url = urlparse(nice_url)
            qd = parse_qs(parsed_url.query, keep_blank_values=True)
            filtered = dict((k, v) for k, v in qd.iteritems() if not k.startswith('utm_'))
            nice_url = urlunparse([
                parsed_url.scheme,
                parsed_url.netloc,
                parsed_url.path,
                parsed_url.params,
                urlencode(filtered, doseq=True),
                parsed_url.fragment
            ])

            exist = Article.query.filter(Article.link == nice_url).first()
            if exist != None and exist.source.subscriber.id == self.user.id:
                continue

            description = ""
            article_title = ""
            try:
                # article content
                description = article.content[0].value
            except AttributeError:
                try:
                    # article description
                    description = article.description
                except Exception:
                    description = ""
            try:
                description = BeautifulSoup(description, "html.parser").decode()
                article_title = BeautifulSoup(article.title, "html.parser").decode()
            except Exception as E:
                #pyaggr3g470r_log.error("Problem when sanitizing the content of the article %s (%s)" % (article_title, nice_url))
                article_title = article.title

            try:
                post_date = datetime(*article.published_parsed[:6])
            except:
                post_date = datetime(*article.updated_parsed[:6])

            # save the article
            article = Article(link=nice_url, title=article_title, 
                              content=description, readed=False, like=False, date=post_date)
            articles.append(article)

            # add the article to the Whoosh index
            """
            try:
                search.add_to_index([article], feed)
            except Exception as e:
                pyaggr3g470r_log.error("Whoosh error.")
                pass"""

            # email notification
            if conf.MAIL_ENABLED and feed.email_notification:
                with app.app_context():
                    msg = Message('[pyAggr3g470r] ' + feed.title + ' : ' + article.title, \
                                sender = conf.MAIL_FROM, recipients = [conf.MAIL_TO])
                    msg.body = utils.clear_string(description)
                    msg.html = description
                    mail.send(msg)

        # add the articles to the list of articles for the current feed
        for article in articles:
            try:
                feed.articles.append(article)
                db.session.merge(article)
                db.session.commit()
                pyaggr3g470r_log.info("New article %s (%s) added." % (article_title, nice_url))
            except IntegrityError:
                pyaggr3g470r_log.error("Article %s (%s) already in the database." % (article_title, nice_url))
                db.session.rollback()
                continue
            except Exception as e:
                pyaggr3g470r_log.error("Error when inserting article in database: " + str(e))
                continue
        return True


if __name__ == "__main__":
    # Point of entry in execution mode
    feed_getter = FeedGetter()
    # Retrieve all feeds
    feed_getter.retrieve_feed()
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