# Author: Nic Wolfe <nic@wolfeden.ca>
# URL: http://code.google.com/p/sickbeard/
#
# This file is part of SickRage.
#
# SickRage 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.
#
# SickRage 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 SickRage.  If not, see <http://www.gnu.org/licenses/>.

import urllib
import time
import datetime
import os

try:
    import xml.etree.cElementTree as etree
except ImportError:
    import elementtree.ElementTree as etree

import sickbeard
import generic

from sickbeard import classes
from sickbeard import helpers
from sickbeard import scene_exceptions
from sickbeard import encodingKludge as ek
from sickbeard import logger
from sickbeard import tvcache
from sickbeard.exceptions import ex, AuthException

from lib import requests
from lib.requests import exceptions
from lib.bencode import bdecode

class NewznabProvider(generic.NZBProvider):
    def __init__(self, name, url, key='', catIDs='5030,5040', search_mode='eponly', search_fallback=False,
                 enable_daily=False, enable_backlog=False):

        generic.NZBProvider.__init__(self, name)

        self.cache = NewznabCache(self)

        self.url = url

        self.key = key

        self.search_mode = search_mode
        self.search_fallback = search_fallback
        self.enable_daily = enable_daily
        self.enable_backlog = enable_backlog

        # a 0 in the key spot indicates that no key is needed
        if self.key == '0':
            self.needs_auth = False
        else:
            self.needs_auth = True

        if catIDs:
            self.catIDs = catIDs
        else:
            self.catIDs = '5030,5040'

        self.enabled = True
        self.supportsBacklog = True

        self.default = False

    def configStr(self):
        return self.name + '|' + self.url + '|' + self.key + '|' + self.catIDs + '|' + str(
            int(self.enabled)) + '|' + self.search_mode + '|' + str(int(self.search_fallback)) + '|' + str(
            int(self.enable_daily)) + '|' + str(int(self.enable_backlog))

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

    def isEnabled(self):
        return self.enabled

    def _getURL(self, url, post_data=None, params=None, timeout=30, json=False):
        """
        By default this is just a simple urlopen call but this method should be overridden
        for providers with special URL requirements (like cookies)
        Not really changed much from the superclass, can be used in future.
        """

        # check for auth
        if not self._doLogin():
            return

        return helpers.getURL(url, post_data=post_data, params=params, headers=self.headers, timeout=timeout,
                              session=self.session, json=json)
    
    def get_newznab_categories(self):
        """
        Uses the newznab provider url and apikey to get the capabilities.
        Makes use of the default newznab caps param. e.a. http://yournewznab/api?t=caps&apikey=skdfiw7823sdkdsfjsfk
        Returns a tuple with (succes or not, array with dicts [{"id": "5070", "name": "Anime"}, 
        {"id": "5080", "name": "Documentary"}, {"id": "5020", "name": "Foreign"}...etc}], error message)
        """
        return_categories = []
        
        self._checkAuth()
        
        params = {"t": "caps"}
        if self.needs_auth and self.key:
            params['apikey'] = self.key

        categories = self.getURL("%s/api" % (self.url), params=params)
        
        xml_categories = helpers.parse_xml(categories)
        
        if not xml_categories:
            return (False, return_categories, "Error parsing xml for [%s]" % (self.name))        
            
        try:
            for category in xml_categories.iter('category'):
                if category.get('name') == 'TV':
                        for subcat in category.findall('subcat'):
                            return_categories.append(subcat.attrib)
        except:
            return (False, return_categories, "Error parsing result for [%s]" % (self.name))                                         
          
        return (True, return_categories, "")

    def _get_season_search_strings(self, ep_obj):

        to_return = []
        cur_params = {}

        # season
        if ep_obj.show.air_by_date or ep_obj.show.sports:
            date_str = str(ep_obj.airdate).split('-')[0]
            cur_params['season'] = date_str
            cur_params['q'] = date_str.replace('-', '.')
        elif ep_obj.show.is_anime:
            cur_params['season'] = "%d" % ep_obj.scene_absolute_number
        else:
            cur_params['season'] = str(ep_obj.scene_season)

        # search
        rid = helpers.mapIndexersToShow(ep_obj.show)[2]
        if rid:
            cur_return = cur_params.copy()
            cur_return['rid'] = rid
            to_return.append(cur_return)

        # add new query strings for exceptions
        name_exceptions = list(
            set(scene_exceptions.get_scene_exceptions(ep_obj.show.indexerid) + [ep_obj.show.name]))
        for cur_exception in name_exceptions:
            if 'q' in cur_params:
                cur_params['q'] = helpers.sanitizeSceneName(cur_exception) + '.' + cur_params['q']
            to_return.append(cur_params)

        return to_return

    def _get_episode_search_strings(self, ep_obj, add_string=''):
        to_return = []
        params = {}

        if not ep_obj:
            return [params]

        if ep_obj.show.air_by_date or ep_obj.show.sports:
            date_str = str(ep_obj.airdate)
            params['season'] = date_str.partition('-')[0]
            params['ep'] = date_str.partition('-')[2].replace('-', '/')
        elif ep_obj.show.anime:
            params['ep'] = "%i" % int(ep_obj.scene_absolute_number)
        else:
            params['season'] = ep_obj.scene_season
            params['ep'] = ep_obj.scene_episode

        # search
        rid = helpers.mapIndexersToShow(ep_obj.show)[2]
        if rid:
            cur_return = params.copy()
            cur_return['rid'] = rid
            to_return.append(cur_return)

        # add new query strings for exceptions
        name_exceptions = list(
            set(scene_exceptions.get_scene_exceptions(ep_obj.show.indexerid) + [ep_obj.show.name]))
        for cur_exception in name_exceptions:
            params['q'] = helpers.sanitizeSceneName(cur_exception)
            to_return.append(params)

        return to_return

    def _doGeneralSearch(self, search_string):
        return self._doSearch({'q': search_string})

    def _checkAuth(self):

        if self.needs_auth and not self.key:
            logger.log(u"Incorrect authentication credentials for " + self.name + " : " + "API key is missing",
                       logger.DEBUG)
            raise AuthException("Your authentication credentials for " + self.name + " are missing, check your config.")

        return True

    def _checkAuthFromData(self, data):

        if data is None:
            return self._checkAuth()

        if 'error' in data.feed:
            code = data.feed['error']['code']

            if code == '100':
                raise AuthException("Your API key for " + self.name + " is incorrect, check your config.")
            elif code == '101':
                raise AuthException("Your account on " + self.name + " has been suspended, contact the administrator.")
            elif code == '102':
                raise AuthException(
                    "Your account isn't allowed to use the API on " + self.name + ", contact the administrator")
            else:
                logger.log(u"Unknown error given from " + self.name + ": " + data.feed['error']['description'],
                           logger.ERROR)
                return False

        return True

    def _doSearch(self, search_params, search_mode='eponly', epcount=0, age=0):

        self._checkAuth()

        params = {"t": "tvsearch",
                  "maxage": sickbeard.USENET_RETENTION,
                  "limit": 100,
                  "attrs": "rageid",
                  "offset": 0}

        # category ids
        if self.show and self.show.is_sports:
            params['cat'] = self.catIDs + ',5060'
        elif self.show and self.show.is_anime:
            params['cat'] = self.catIDs + ',5070'
        else:
            params['cat'] = self.catIDs

        # if max_age is set, use it, don't allow it to be missing
        if age or not params['maxage']:
            params['maxage'] = age

        if search_params:
            params.update(search_params)

        if self.needs_auth and self.key:
            params['apikey'] = self.key

        results = []
        offset = total = 0

        while total >= (offset or 1000):
            search_url = self.url + 'api?' + urllib.urlencode(params)
            logger.log(u"Search url: " + search_url, logger.DEBUG)
            data = self.cache.getRSSFeed(search_url)

            if not data or not self._checkAuthFromData(data):
                break

            for item in data.entries:

                (title, url) = self._get_title_and_url(item)

                if title and url:
                    results.append(item)
                else:
                    logger.log(
                        u"The data returned from the " + self.name + " is incomplete, this result is unusable",
                        logger.DEBUG)

            # get total and offset attribs
            if total == 0:
                total = int(data.feed.newznab_response['total'] or 0)
            offset = int(data.feed.newznab_response['offset'] or 0)

            # if there are more items available then the amount given in one call, grab some more
            params['offset'] += params['limit']

            logger.log(str(
                total - offset) + " more items to be fetched from provider. Fetching another " + str(
                params['limit']) + " items.", logger.DEBUG)

        return results

    def findPropers(self, search_date=None):

        search_terms = ['.proper.', '.repack.']

        cache_results = self.cache.listPropers(search_date)
        results = [classes.Proper(x['name'], x['url'], datetime.datetime.fromtimestamp(x['time']), self.show) for x in
                   cache_results]

        index = 0
        alt_search = ('nzbs_org' == self.getID())
        term_items_found = False
        do_search_alt = False

        while index < len(search_terms):
            search_params = {'q': search_terms[index]}
            if alt_search:

                if do_search_alt:
                    index += 1

                if term_items_found:
                    do_search_alt = True
                    term_items_found = False
                else:
                    if do_search_alt:
                        search_params['t'] = "search"

                    do_search_alt = (True, False)[do_search_alt]

            else:
                index += 1

            for item in self._doSearch(search_params, age=4):

                (title, url) = self._get_title_and_url(item)

                if item.has_key('published_parsed') and item['published_parsed']:
                    result_date = item.published_parsed
                    if result_date:
                        result_date = datetime.datetime(*result_date[0:6])
                else:
                    logger.log(u"Unable to figure out the date for entry " + title + ", skipping it")
                    continue

                if not search_date or result_date > search_date:
                    search_result = classes.Proper(title, url, result_date, self.show)
                    results.append(search_result)
                    term_items_found = True
                    do_search_alt = False

        return results


class NewznabCache(tvcache.TVCache):
    def __init__(self, provider):

        tvcache.TVCache.__init__(self, provider)

        # only poll newznab providers every 15 minutes max
        self.minTime = 15

    def _getRSSData(self):

        params = {"t": "tvsearch",
                  "cat": self.provider.catIDs + ',5060,5070',
                  "attrs": "rageid"}

        if self.provider.needs_auth and self.provider.key:
            params['apikey'] = self.provider.key

        rss_url = self.provider.url + 'api?' + urllib.urlencode(params)

        logger.log(self.provider.name + " cache update URL: " + rss_url, logger.DEBUG)

        return self.getRSSFeed(rss_url)

    def _checkAuth(self, data):
        return self.provider._checkAuthFromData(data)

    def updateCache(self):

        if self.shouldUpdate() and self._checkAuth(None):
            data = self._getRSSData()

            # as long as the http request worked we count this as an update
            if not data:
                return []

            self.setLastUpdate()

            # clear cache
            self._clearCache()

            if self._checkAuth(data):
                items = data.entries
                cl = []
                for item in items:
                    ci = self._parseItem(item)
                    if ci is not None:
                        cl.append(ci)

                if len(cl) > 0:
                    myDB = self._getDB()
                    myDB.mass_action(cl)

            else:
                raise AuthException(
                    u"Your authentication credentials for " + self.provider.name + " are incorrect, check your config")

        return []

    # overwrite method with that parses the rageid from the newznab feed
    def _parseItem(self, item):
        title = item.title
        url = item.link

        attrs = item.newznab_attr
        if not isinstance(attrs, list):
            attrs = [item.newznab_attr]

        tvrageid = 0
        for attr in attrs:
            if attr['name'] == 'tvrageid':
                tvrageid = int(attr['value'])
                break

        self._checkItemAuth(title, url)

        if not title or not url:
            logger.log(
                u"The data returned from the " + self.provider.name + " feed is incomplete, this result is unusable",
                logger.DEBUG)
            return None

        url = self._translateLinkURL(url)

        logger.log(u"Attempting to add item from RSS to cache: " + title, logger.DEBUG)
        return self._addCacheEntry(title, url, indexer_id=tvrageid)