# Author: Mr_Orange
#
# This file is part of Sick Beard.
#
# Sick Beard is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Sick Beard 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Sick Beard.  If not, see <http://www.gnu.org/licenses/>.


import os
import xml.dom.minidom
import re
from urlparse import urlparse, urljoin

import sickbeard
import generic

from sickbeard import helpers
from sickbeard import encodingKludge as ek
from sickbeard import logger
from sickbeard import tvcache
from sickbeard import clients
from sickbeard.exceptions import ex

from lib import requests
from bs4 import BeautifulSoup
from lib.bencode import bdecode

class TorrentRssProvider(generic.TorrentProvider):

    def __init__(self, name, url):

        generic.TorrentProvider.__init__(self, name)
        self.cache = TorrentRssCache(self)
        self.url = re.sub('\/$', '', url)
        self.enabled = True
        self.supportsBacklog = False
        self.session = None

    def configStr(self):
        return self.name + '|' + self.url + '|' + str(int(self.enabled))

    def imageName(self):
        if ek.ek(os.path.isfile, ek.ek(os.path.join, sickbeard.PROG_DIR, 'data', 'images', 'providers', self.getID() + '.png')):
            return self.getID() + '.png'        
        return 'torrentrss.png'

    def isEnabled(self):
        return self.enabled

    def _get_title_and_url(self, item):
        
        title, url = None, None

        self.cache._remove_namespace(item)

        title = helpers.get_xml_text(item.find('title'))
        
        attempt_list = [lambda: helpers.get_xml_text(item.find('magnetURI')),
                        
                        lambda: item.find('enclosure').get('url'),
                        
                        lambda: helpers.get_xml_text(item.find('link'))]

        
        for cur_attempt in attempt_list:
            try:
                url = cur_attempt()
            except:
                continue
        
            if title and url:
                return (title, url)
            
        return (title, url)

    def validateRSS(self):

        try:        
            
            data = self.cache._getRSSData()
                
            if not data:
                return (False, 'No data returned from url: ' + self.url)
    
            parsedXML = helpers.parse_xml(data)
            
            if not parsedXML:
                return (False, 'Unable to parse RSS, is it a real RSS? ')
    
            items = parsedXML.findall('.//item')
    
            if not items:
                return (False, 'No items found in the RSS feed ' + self.url)
            
            (title, url) = self._get_title_and_url(items[0])
            
            if not title:
                return (False, 'Unable to get title from first item')
    
            if not url:
                return (False, 'Unable to get torrent url from first item')
    
            if url.startswith('magnet:') and re.search('urn:btih:([\w]{32,40})', url):
                return (True, 'RSS feed Parsed correctly')
            else:
    
                torrent_file = self.getURL(url)
                try: 
                    bdecode(torrent_file)
                except Exception, e:
                    self.dumpHTML(torrent_file)
                    return (False, 'Torrent link is not a valid torrent file: ' + ex(e))
           
            return (True, 'RSS feed Parsed correctly')

        except Exception, e:
            return (False, 'Error when trying to load RSS: ' + ex(e))

    def getURL(self, url, headers=None):
        
        if not self.session:
            self.session = requests.Session()
        
        try:
            url = urljoin(url, urlparse(url).path.replace('//','/'))
            response = self.session.get(url, verify=False)
        except (requests.exceptions.ConnectionError, requests.exceptions.HTTPError), e:
            logger.log(u"Error loading "+self.name+" URL: " + ex(e), logger.ERROR)
            return None
            
        if response.status_code != 200:
            logger.log(self.name + u" page requested with url " + url +" returned status code is " + str(response.status_code) + ': ' + clients.http_error_code[response.status_code], logger.WARNING)
            return None

        return response.content

    def dumpHTML(self, data):
        
        dumpName = ek.ek(os.path.join, sickbeard.CACHE_DIR, 'custom_torrent.html')

        try:    
            fileOut = open(dumpName, 'wb')
            fileOut.write(data)
            fileOut.close()
            helpers.chmodAsParent(dumpName)
        except IOError, e:
            logger.log("Unable to save the file: " + ex(e), logger.ERROR)
            return False
        logger.log(u"Saved custom_torrent html dump " + dumpName + " ", logger.MESSAGE)
        return True 

class TorrentRssCache(tvcache.TVCache):

    def __init__(self, provider):

        tvcache.TVCache.__init__(self, provider)
        self.minTime = 15

    def _getRSSData(self):

        logger.log(u"TorrentRssCache cache update URL: " + self.provider.url, logger.DEBUG)
        data = self.provider.getURL(self.provider.url)
        return data

    def _parseItem(self, item):
        
        (title, url) = self.provider._get_title_and_url(item)
        if not title or not url:
            logger.log(u"The XML returned from the RSS feed is incomplete, this result is unusable", logger.ERROR)
            return None
        
        logger.log(u"Adding item from RSS to cache: " + title, logger.DEBUG)
        return self._addCacheEntry(title, url)

    def _remove_namespace(self, item):
        """Remove namespace from the xml document in place"""
        for elem in item.getiterator():
            name_space = re.search('\{(.*)\}', elem.tag)
            if name_space:
                ns_len = len(name_space.group(0))
                elem.tag = elem.tag[ns_len:]