# Author: Nic Wolfe <nic@wolfeden.ca>
# URL: http://code.google.com/p/sickbeard/
#
# 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 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.common import cpu_presets
from sickbeard import logger
from sickbeard import tvcache
from sickbeard.exceptions import ex, AuthException


class NewznabProvider(generic.NZBProvider):
    def __init__(self, name, url, key='', catIDs='5030,5040,5060', search_mode='eponly', search_fallback=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

        if self.search_fallback == '0':
            self.search_fallback = False
        else:
            self.search_fallback = True

        # 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, 5060'

        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))

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

    def isEnabled(self):
        return self.enabled

    def _get_season_search_strings(self, ep_obj):

        to_return = []

        # add new query strings for exceptions
        name_exceptions = scene_exceptions.get_scene_exceptions(self.show.indexerid) + [self.show.name]
        for cur_exception in name_exceptions:

            cur_params = {}

            # search
            cur_params['q'] = helpers.sanitizeSceneName(cur_exception)

            # season
            if ep_obj.show.air_by_date or ep_obj.show.sports:
                cur_params['season'] = str(ep_obj.airdate)[:7]
            else:
                cur_params['season'] = str(ep_obj.scene_season)

            to_return.append(cur_params)

        return to_return

    def _get_episode_search_strings(self, ep_obj, add_string=''):

        params = {}

        if not ep_obj:
            return [params]

        # search
        params['q'] = helpers.sanitizeSceneName(self.show.name)

        if self.show.air_by_date:
            date_str = str(ep_obj.airdate)
            params['season'] = date_str.partition('-')[0]
            params['ep'] = date_str.partition('-')[2].replace('-', '/')
        elif self.show.sports:
            date_str = str(ep_obj.airdate)
            params['season'] = date_str.partition('-')[0]
            params['ep'] = date_str.partition('-')[2].replace('-', '/')
        else:
            params['season'] = ep_obj.scene_season
            params['ep'] = ep_obj.scene_episode

        to_return = [params]

        # only do exceptions if we are searching by name
        if 'q' in params:

            # add new query strings for exceptions
            name_exceptions = scene_exceptions.get_scene_exceptions(self.show.indexerid)
            for cur_exception in name_exceptions:

                # don't add duplicates
                if cur_exception == self.show.name:
                    continue

                cur_return = params.copy()
                cur_return['q'] = helpers.sanitizeSceneName(cur_exception)
                to_return.append(cur_return)

        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:
            logger.log(u"Newznab ERROR:[%s] CODE:[%s]" % (data.feed['error']['description'], data.feed['error']['code']), logger.DEBUG)
            raise AuthException("%s" % data.feed['error']['description'])

        return True

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

        self._checkAuth()

        params = {"t": "tvsearch",
                  "maxage": sickbeard.USENET_RETENTION,
                  "limit": 100,
                  "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

        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:
            return []

        if self._checkAuthFromData(data):

            items = data.entries
            results = []

            for curItem in items:
                (title, url) = self._get_title_and_url(curItem)

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

            return results

        return []

    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'])) 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)
                    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}

        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):

        # delete anything older then 7 days
        logger.log(u"Clearing " + self.provider.name + " cache")
        self._clearCache()

        if not self.shouldUpdate():
            return

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

            # as long as the http request worked we count this as an update
            if data:
                self.setLastUpdate()
            else:
                return []

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

                    time.sleep(cpu_presets[sickbeard.CPU_PRESET])

                myDB = self._getDB()
                myDB.mass_action(ql)

            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

        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)