SickGear/sickbeard/metadata/generic.py

# 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/>.

from __future__ import with_statement

import os.path

import xml.etree.cElementTree as etree

import re

import sickbeard

from sickbeard import exceptions, helpers
from sickbeard.metadata import helpers as metadata_helpers
from sickbeard import logger
from sickbeard import encodingKludge as ek
from sickbeard.exceptions import ex


from sickbeard.indexers import indexer_api, indexer_exceptions

class GenericMetadata():
    """
    Base class for all metadata providers. Default behavior is meant to mostly
    follow XBMC 12+ metadata standards. Has support for:
    - show metadata file
    - episode metadata file
    - episode thumbnail
    - show fanart
    - show poster
    - show banner
    - season thumbnails (poster)
    - season thumbnails (banner)
    - season all poster
    - season all banner
    """

    def __init__(self,
                 show_metadata=False,
                 episode_metadata=False,
                 fanart=False,
                 poster=False,
                 banner=False,
                 episode_thumbnails=False,
                 season_posters=False,
                 season_banners=False,
                 season_all_poster=False,
                 season_all_banner=False):

        self.name = "Generic"

        self._ep_nfo_extension = "nfo"
        self._show_metadata_filename = "tvshow.nfo"

        self.fanart_name = "fanart.jpg"
        self.poster_name = "poster.jpg"
        self.banner_name = "banner.jpg"

        self.season_all_poster_name = "season-all-poster.jpg"
        self.season_all_banner_name = "season-all-banner.jpg"

        self.show_metadata = show_metadata
        self.episode_metadata = episode_metadata
        self.fanart = fanart
        self.poster = poster
        self.banner = banner
        self.episode_thumbnails = episode_thumbnails
        self.season_posters = season_posters
        self.season_banners = season_banners
        self.season_all_poster = season_all_poster
        self.season_all_banner = season_all_banner

    def get_config(self):
        config_list = [self.show_metadata, self.episode_metadata, self.fanart, self.poster, self.banner, self.episode_thumbnails, self.season_posters, self.season_banners, self.season_all_poster, self.season_all_banner]
        return '|'.join([str(int(x)) for x in config_list])

    def get_id(self):
        return GenericMetadata.makeID(self.name)

    @staticmethod
    def makeID(name):
        name_id = re.sub("[+]", "plus", name)
        name_id = re.sub("[^\w\d_]", "_", name_id).lower()
        return name_id

    def set_config(self, string):
        config_list = [bool(int(x)) for x in string.split('|')]
        self.show_metadata = config_list[0]
        self.episode_metadata = config_list[1]
        self.fanart = config_list[2]
        self.poster = config_list[3]
        self.banner = config_list[4]
        self.episode_thumbnails = config_list[5]
        self.season_posters = config_list[6]
        self.season_banners = config_list[7]
        self.season_all_poster = config_list[8]
        self.season_all_banner = config_list[9]

    def _has_show_metadata(self, show_obj):
        result = ek.ek(os.path.isfile, self.get_show_file_path(show_obj))
        logger.log(u"Checking if " + self.get_show_file_path(show_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_episode_metadata(self, ep_obj):
        result = ek.ek(os.path.isfile, self.get_episode_file_path(ep_obj))
        logger.log(u"Checking if " + self.get_episode_file_path(ep_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_fanart(self, show_obj):
        result = ek.ek(os.path.isfile, self.get_fanart_path(show_obj))
        logger.log(u"Checking if " + self.get_fanart_path(show_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_poster(self, show_obj):
        result = ek.ek(os.path.isfile, self.get_poster_path(show_obj))
        logger.log(u"Checking if " + self.get_poster_path(show_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_banner(self, show_obj):
        result = ek.ek(os.path.isfile, self.get_banner_path(show_obj))
        logger.log(u"Checking if " + self.get_banner_path(show_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_episode_thumb(self, ep_obj):
        location = self.get_episode_thumb_path(ep_obj)
        result = location != None and ek.ek(os.path.isfile, location)
        if location:
            logger.log(u"Checking if " + location + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_season_poster(self, show_obj, season):
        location = self.get_season_poster_path(show_obj, season)
        result = location != None and ek.ek(os.path.isfile, location)
        if location:
            logger.log(u"Checking if " + location + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_season_banner(self, show_obj, season):
        location = self.get_season_banner_path(show_obj, season)
        result = location != None and ek.ek(os.path.isfile, location)
        if location:
            logger.log(u"Checking if " + location + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_season_all_poster(self, show_obj):
        result = ek.ek(os.path.isfile, self.get_season_all_poster_path(show_obj))
        logger.log(u"Checking if " + self.get_season_all_poster_path(show_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def _has_season_all_banner(self, show_obj):
        result = ek.ek(os.path.isfile, self.get_season_all_banner_path(show_obj))
        logger.log(u"Checking if " + self.get_season_all_banner_path(show_obj) + " exists: " + str(result), logger.DEBUG)
        return result

    def get_show_file_path(self, show_obj):
        return ek.ek(os.path.join, show_obj.location, self._show_metadata_filename)

    def get_episode_file_path(self, ep_obj):
        return helpers.replaceExtension(ep_obj.location, self._ep_nfo_extension)

    def get_fanart_path(self, show_obj):
        return ek.ek(os.path.join, show_obj.location, self.fanart_name)

    def get_poster_path(self, show_obj):
        return ek.ek(os.path.join, show_obj.location, self.poster_name)

    def get_banner_path(self, show_obj):
        return ek.ek(os.path.join, show_obj.location, self.banner_name)

    def get_episode_thumb_path(self, ep_obj):
        """
        Returns the path where the episode thumbnail should be stored.
        ep_obj: a TVEpisode instance for which to create the thumbnail
        """
        if ek.ek(os.path.isfile, ep_obj.location):

            tbn_filename = ep_obj.location.rpartition(".")

            if tbn_filename[0] == "":
                tbn_filename = ep_obj.location + "-thumb.jpg"
            else:
                tbn_filename = tbn_filename[0] + "-thumb.jpg"
        else:
            return None

        return tbn_filename

    def get_season_poster_path(self, show_obj, season):
        """
        Returns the full path to the file for a given season poster.

        show_obj: a TVShow instance for which to generate the path
        season: a season number to be used for the path. Note that season 0
                means specials.
        """

        # Our specials thumbnail is, well, special
        if season == 0:
            season_poster_filename = 'season-specials'
        else:
            season_poster_filename = 'season' + str(season).zfill(2)

        return ek.ek(os.path.join, show_obj.location, season_poster_filename + '-poster.jpg')

    def get_season_banner_path(self, show_obj, season):
        """
        Returns the full path to the file for a given season banner.

        show_obj: a TVShow instance for which to generate the path
        season: a season number to be used for the path. Note that season 0
                means specials.
        """

        # Our specials thumbnail is, well, special
        if season == 0:
            season_banner_filename = 'season-specials'
        else:
            season_banner_filename = 'season' + str(season).zfill(2)

        return ek.ek(os.path.join, show_obj.location, season_banner_filename + '-banner.jpg')

    def get_season_all_poster_path(self, show_obj):
        return ek.ek(os.path.join, show_obj.location, self.season_all_poster_name)

    def get_season_all_banner_path(self, show_obj):
        return ek.ek(os.path.join, show_obj.location, self.season_all_banner_name)

    def _show_data(self, show_obj):
        """
        This should be overridden by the implementing class. It should
        provide the content of the show metadata file.
        """
        return None

    def _ep_data(self, ep_obj):
        """
        This should be overridden by the implementing class. It should
        provide the content of the episode metadata file.
        """
        return None

    def create_show_metadata(self, show_obj, force=False):
        if self.show_metadata and show_obj and (not self._has_show_metadata(show_obj) or force):
            logger.log(u"Metadata provider " + self.name + " creating show metadata for " + show_obj.name, logger.DEBUG)
            return self.write_show_file(show_obj)
        return False

    def create_episode_metadata(self, ep_obj, force=False):
        if self.episode_metadata and ep_obj and (not self._has_episode_metadata(ep_obj) or force):
            logger.log(u"Metadata provider " + self.name + " creating episode metadata for " + ep_obj.prettyName(), logger.DEBUG)
            return self.write_ep_file(ep_obj)
        return False

    def create_fanart(self, show_obj):
        if self.fanart and show_obj and not self._has_fanart(show_obj):
            logger.log(u"Metadata provider " + self.name + " creating fanart for " + show_obj.name, logger.DEBUG)
            return self.save_fanart(show_obj)
        return False

    def create_poster(self, show_obj):
        if self.poster and show_obj and not self._has_poster(show_obj):
            logger.log(u"Metadata provider " + self.name + " creating poster for " + show_obj.name, logger.DEBUG)
            return self.save_poster(show_obj)
        return False

    def create_banner(self, show_obj):
        if self.banner and show_obj and not self._has_banner(show_obj):
            logger.log(u"Metadata provider " + self.name + " creating banner for " + show_obj.name, logger.DEBUG)
            return self.save_banner(show_obj)
        return False

    def create_episode_thumb(self, ep_obj):
        if self.episode_thumbnails and ep_obj and not self._has_episode_thumb(ep_obj):
            logger.log(u"Metadata provider " + self.name + " creating episode thumbnail for " + ep_obj.prettyName(), logger.DEBUG)
            return self.save_thumbnail(ep_obj)
        return False

    def create_season_posters(self, show_obj):
        if self.season_posters and show_obj:
            result = []
            for season, episodes in show_obj.episodes.iteritems():  # @UnusedVariable
                if not self._has_season_poster(show_obj, season):
                    logger.log(u"Metadata provider " + self.name + " creating season posters for " + show_obj.name, logger.DEBUG)
                    result = result + [self.save_season_posters(show_obj, season)]
            return all(result)
        return False

    def create_season_banners(self, show_obj):
        if self.season_banners and show_obj:
            result = []
            for season, episodes in show_obj.episodes.iteritems():  # @UnusedVariable
                if not self._has_season_banner(show_obj, season):
                    logger.log(u"Metadata provider " + self.name + " creating season banners for " + show_obj.name, logger.DEBUG)
                    result = result + [self.save_season_banners(show_obj, season)]
            return all(result)
        return False

    def create_season_all_poster(self, show_obj):
        if self.season_all_poster and show_obj and not self._has_season_all_poster(show_obj):
            logger.log(u"Metadata provider " + self.name + " creating season all poster for " + show_obj.name, logger.DEBUG)
            return self.save_season_all_poster(show_obj)
        return False

    def create_season_all_banner(self, show_obj):
        if self.season_all_banner and show_obj and not self._has_season_all_banner(show_obj):
            logger.log(u"Metadata provider " + self.name + " creating season all banner for " + show_obj.name, logger.DEBUG)
            return self.save_season_all_banner(show_obj)
        return False

    def _get_episode_thumb_url(self, ep_obj):
        """
        Returns the URL to use for downloading an episode's thumbnail. Uses
        theTVDB.com and TVRage.com data.

        ep_obj: a TVEpisode object for which to grab the thumb URL
        """
        all_eps = [ep_obj] + ep_obj.relatedEps

        indexer_lang = ep_obj.show.lang

        # get a TVDB object
        try:
            # There's gotta be a better way of doing this but we don't wanna
            # change the language value elsewhere
            lINDEXER_API_PARMS = {'indexer': ep_obj.show.indexer}

            lINDEXER_API_PARMS['actors'] = True

            if indexer_lang and not indexer_lang == 'en':
                lINDEXER_API_PARMS['language'] = indexer_lang

            if ep_obj.show.dvdorder != 0:
                lINDEXER_API_PARMS['dvdorder'] = True

            t = indexer_api.indexerApi(**lINDEXER_API_PARMS)

            indexer_show_obj = t[ep_obj.show.indexerid]
        except indexer_exceptions.indexer_shownotfound, e:
            raise exceptions.ShowNotFoundException(e.message)
        except indexer_exceptions.indexer_error, e:
            logger.log(u"Unable to connect to " + ep_obj.show.indexer + " while creating meta files - skipping - " + ex(e), logger.ERROR)
            return None

        # try all included episodes in case some have thumbs and others don't
        for cur_ep in all_eps:
            try:
                myEp = indexer_show_obj[cur_ep.season][cur_ep.episode]
            except (indexer_exceptions.indexer_episodenotfound, indexer_exceptions.indexer_seasonnotfound):
                logger.log(u"Unable to find episode " + str(cur_ep.season) + "x" + str(cur_ep.episode) + " on " + ep_obj.show.indexer + ".. has it been removed? Should I delete from db?")
                continue

            thumb_url = getattr(myEp, 'filename', None)

            if thumb_url is not None:
                return thumb_url

        return None

    def write_show_file(self, show_obj):
        """
        Generates and writes show_obj's metadata under the given path to the
        filename given by get_show_file_path()

        show_obj: TVShow object for which to create the metadata

        path: An absolute or relative path where we should put the file. Note that
                the file name will be the default show_file_name.

        Note that this method expects that _show_data will return an ElementTree
        object. If your _show_data returns data in another format you'll need to
        override this method.
        """

        data = self._show_data(show_obj)

        if not data:
            return False

        nfo_file_path = self.get_show_file_path(show_obj)
        nfo_file_dir = ek.ek(os.path.dirname, nfo_file_path)

        try:
            if not ek.ek(os.path.isdir, nfo_file_dir):
                logger.log(u"Metadata dir didn't exist, creating it at " + nfo_file_dir, logger.DEBUG)
                ek.ek(os.makedirs, nfo_file_dir)
                helpers.chmodAsParent(nfo_file_dir)

            logger.log(u"Writing show nfo file to " + nfo_file_path, logger.DEBUG)

            nfo_file = ek.ek(open, nfo_file_path, 'w')

            data.write(nfo_file, encoding="utf-8")
            nfo_file.close()
            helpers.chmodAsParent(nfo_file_path)
        except IOError, e:
            logger.log(u"Unable to write file to " + nfo_file_path + " - are you sure the folder is writable? " + ex(e), logger.ERROR)
            return False

        return True

    def write_ep_file(self, ep_obj):
        """
        Generates and writes ep_obj's metadata under the given path with the
        given filename root. Uses the episode's name with the extension in
        _ep_nfo_extension.

        ep_obj: TVEpisode object for which to create the metadata

        file_name_path: The file name to use for this metadata. Note that the extension
                will be automatically added based on _ep_nfo_extension. This should
                include an absolute path.

        Note that this method expects that _ep_data will return an ElementTree
        object. If your _ep_data returns data in another format you'll need to
        override this method.
        """

        data = self._ep_data(ep_obj)

        if not data:
            return False

        nfo_file_path = self.get_episode_file_path(ep_obj)
        nfo_file_dir = ek.ek(os.path.dirname, nfo_file_path)

        try:
            if not ek.ek(os.path.isdir, nfo_file_dir):
                logger.log(u"Metadata dir didn't exist, creating it at " + nfo_file_dir, logger.DEBUG)
                ek.ek(os.makedirs, nfo_file_dir)
                helpers.chmodAsParent(nfo_file_dir)

            logger.log(u"Writing episode nfo file to " + nfo_file_path, logger.DEBUG)

            nfo_file = ek.ek(open, nfo_file_path, 'w')

            data.write(nfo_file, encoding="utf-8")
            nfo_file.close()
            helpers.chmodAsParent(nfo_file_path)
        except IOError, e:
            logger.log(u"Unable to write file to " + nfo_file_path + " - are you sure the folder is writable? " + ex(e), logger.ERROR)
            return False

        return True

    def save_thumbnail(self, ep_obj):
        """
        Retrieves a thumbnail and saves it to the correct spot. This method should not need to
        be overridden by implementing classes, changing get_episode_thumb_path and
        _get_episode_thumb_url should suffice.

        ep_obj: a TVEpisode object for which to generate a thumbnail
        """

        file_path = self.get_episode_thumb_path(ep_obj)

        if not file_path:
            logger.log(u"Unable to find a file path to use for this thumbnail, not generating it", logger.DEBUG)
            return False

        thumb_url = self._get_episode_thumb_url(ep_obj)

        # if we can't find one then give up
        if not thumb_url:
            logger.log(u"No thumb is available for this episode, not creating a thumb", logger.DEBUG)
            return False

        thumb_data = metadata_helpers.getShowImage(thumb_url)

        result = self._write_image(thumb_data, file_path)

        if not result:
            return False

        for cur_ep in [ep_obj] + ep_obj.relatedEps:
            cur_ep.hastbn = True

        return True

    def save_fanart(self, show_obj, which=None):
        """
        Downloads a fanart image and saves it to the filename specified by fanart_name
        inside the show's root folder.

        show_obj: a TVShow object for which to download fanart
        """

        # use the default fanart name
        fanart_path = self.get_fanart_path(show_obj)

        fanart_data = self._retrieve_show_image('fanart', show_obj, which)

        if not fanart_data:
            logger.log(u"No fanart image was retrieved, unable to write fanart", logger.DEBUG)
            return False

        return self._write_image(fanart_data, fanart_path)

    def save_poster(self, show_obj, which=None):
        """
        Downloads a poster image and saves it to the filename specified by poster_name
        inside the show's root folder.

        show_obj: a TVShow object for which to download a poster
        """

        # use the default poster name
        poster_path = self.get_poster_path(show_obj)

        poster_data = self._retrieve_show_image('poster', show_obj, which)

        if not poster_data:
            logger.log(u"No show poster image was retrieved, unable to write poster", logger.DEBUG)
            return False

        return self._write_image(poster_data, poster_path)

    def save_banner(self, show_obj, which=None):
        """
        Downloads a banner image and saves it to the filename specified by banner_name
        inside the show's root folder.

        show_obj: a TVShow object for which to download a banner
        """

        # use the default banner name
        banner_path = self.get_banner_path(show_obj)

        banner_data = self._retrieve_show_image('banner', show_obj, which)

        if not banner_data:
            logger.log(u"No show banner image was retrieved, unable to write banner", logger.DEBUG)
            return False

        return self._write_image(banner_data, banner_path)

    def save_season_posters(self, show_obj, season):
        """
        Saves all season posters to disk for the given show.

        show_obj: a TVShow object for which to save the season thumbs

        Cycles through all seasons and saves the season posters if possible. This
        method should not need to be overridden by implementing classes, changing
        _season_posters_dict and get_season_poster_path should be good enough.
        """

        season_dict = self._season_posters_dict(show_obj, season)
        result = []

        # Returns a nested dictionary of season art with the season
        # number as primary key. It's really overkill but gives the option
        # to present to user via ui to pick down the road.
        for cur_season in season_dict:

            cur_season_art = season_dict[cur_season]

            if len(cur_season_art) == 0:
                continue

            # Just grab whatever's there for now
            art_id, season_url = cur_season_art.popitem()  # @UnusedVariable

            season_poster_file_path = self.get_season_poster_path(show_obj, cur_season)

            if not season_poster_file_path:
                logger.log(u"Path for season " + str(cur_season) + " came back blank, skipping this season", logger.DEBUG)
                continue

            seasonData = metadata_helpers.getShowImage(season_url)

            if not seasonData:
                logger.log(u"No season poster data available, skipping this season", logger.DEBUG)
                continue

            result = result + [self._write_image(seasonData, season_poster_file_path)]
        if result:
            return all(result)
        else:
            return False

        return True

    def save_season_banners(self, show_obj, season):
        """
        Saves all season banners to disk for the given show.

        show_obj: a TVShow object for which to save the season thumbs

        Cycles through all seasons and saves the season banners if possible. This
        method should not need to be overridden by implementing classes, changing
        _season_banners_dict and get_season_banner_path should be good enough.
        """

        season_dict = self._season_banners_dict(show_obj, season)
        result = []

        # Returns a nested dictionary of season art with the season
        # number as primary key. It's really overkill but gives the option
        # to present to user via ui to pick down the road.
        for cur_season in season_dict:

            cur_season_art = season_dict[cur_season]

            if len(cur_season_art) == 0:
                continue

            # Just grab whatever's there for now
            art_id, season_url = cur_season_art.popitem()  # @UnusedVariable

            season_banner_file_path = self.get_season_banner_path(show_obj, cur_season)

            if not season_banner_file_path:
                logger.log(u"Path for season " + str(cur_season) + " came back blank, skipping this season", logger.DEBUG)
                continue

            seasonData = metadata_helpers.getShowImage(season_url)

            if not seasonData:
                logger.log(u"No season banner data available, skipping this season", logger.DEBUG)
                continue

            result = result + [self._write_image(seasonData, season_banner_file_path)]
        if result:
            return all(result)
        else:
            return False

        return True

    def save_season_all_poster(self, show_obj, which=None):
        # use the default season all poster name
        poster_path = self.get_season_all_poster_path(show_obj)

        poster_data = self._retrieve_show_image('poster', show_obj, which)

        if not poster_data:
            logger.log(u"No show poster image was retrieved, unable to write season all poster", logger.DEBUG)
            return False

        return self._write_image(poster_data, poster_path)

    def save_season_all_banner(self, show_obj, which=None):
        # use the default season all banner name
        banner_path = self.get_season_all_banner_path(show_obj)

        banner_data = self._retrieve_show_image('banner', show_obj, which)

        if not banner_data:
            logger.log(u"No show banner image was retrieved, unable to write season all banner", logger.DEBUG)
            return False

        return self._write_image(banner_data, banner_path)

    def _write_image(self, image_data, image_path):
        """
        Saves the data in image_data to the location image_path. Returns True/False
        to represent success or failure.

        image_data: binary image data to write to file
        image_path: file location to save the image to
        """

        # don't bother overwriting it
        if ek.ek(os.path.isfile, image_path):
            logger.log(u"Image already exists, not downloading", logger.DEBUG)
            return False

        if not image_data:
            logger.log(u"Unable to retrieve image, skipping", logger.WARNING)
            return False

        image_dir = ek.ek(os.path.dirname, image_path)

        try:
            if not ek.ek(os.path.isdir, image_dir):
                logger.log(u"Metadata dir didn't exist, creating it at " + image_dir, logger.DEBUG)
                ek.ek(os.makedirs, image_dir)
                helpers.chmodAsParent(image_dir)

            outFile = ek.ek(open, image_path, 'wb')
            outFile.write(image_data)
            outFile.close()
            helpers.chmodAsParent(image_path)
        except IOError, e:
            logger.log(u"Unable to write image to " + image_path + " - are you sure the show folder is writable? " + ex(e), logger.ERROR)
            return False

        return True

    def _retrieve_show_image(self, image_type, show_obj, which=None):
        """
        Gets an image URL from theTVDB.com and TVRage.com, downloads it and returns the data.

        image_type: type of image to retrieve (currently supported: fanart, poster, banner)
        show_obj: a TVShow object to use when searching for the image
        which: optional, a specific numbered poster to look for

        Returns: the binary image data if available, or else None
        """

        indexer_lang = show_obj.lang

        try:
            # There's gotta be a better way of doing this but we don't wanna
            # change the language value elsewhere
            lINDEXER_API_PARMS = {'indexer': show_obj.indexer}

            lINDEXER_API_PARMS['banners'] = True

            if indexer_lang and not indexer_lang == 'en':
                lINDEXER_API_PARMS['language'] = indexer_lang

            if show_obj.dvdorder != 0:
                lINDEXER_API_PARMS['dvdorder'] = True

            t = indexer_api.indexerApi(**lINDEXER_API_PARMS)
            indexer_show_obj = t[show_obj.indexerid]
        except (indexer_exceptions.indexer_error, IOError), e:
            logger.log(u"Unable to look up show on " + show_obj.indexer + ", not downloading images: " + ex(e), logger.ERROR)
            return None

        if image_type not in ('fanart', 'poster', 'banner', 'poster_thumb', 'banner_thumb'):
            logger.log(u"Invalid image type " + str(image_type) + ", couldn't find it in the " + show_obj.indexer + " object", logger.ERROR)
            return None

        try:
            if image_type == 'poster_thumb':
                image_url = re.sub('posters', '_cache/posters', indexer_show_obj['poster'])
            elif image_type == 'banner_thumb':
                image_url = re.sub('graphical', '_cache/graphical', indexer_show_obj['banner'])
            else:
                image_url = indexer_show_obj[image_type]
        except:
            return None

        image_data = metadata_helpers.getShowImage(image_url, which)

        return image_data

    def _season_posters_dict(self, show_obj, season):
        """
        Should return a dict like:

        result = {<season number>:
                    {1: '<url 1>', 2: <url 2>, ...},}
        """

        # This holds our resulting dictionary of season art
        result = {}

        indexer_lang = show_obj.lang

        try:
            # There's gotta be a better way of doing this but we don't wanna
            # change the language value elsewhere
            lINDEXER_API_PARMS = {'indexer': show_obj.indexer}

            lINDEXER_API_PARMS['banners'] = True

            if indexer_lang and not indexer_lang == 'en':
                lINDEXER_API_PARMS['language'] = indexer_lang

            if show_obj.dvdorder != 0:
                lINDEXER_API_PARMS['dvdorder'] = True

            t = indexer_api.indexerApi(**lINDEXER_API_PARMS)
            indexer_show_obj = t[show_obj.indexerid]
        except (indexer_exceptions.indexer_error, IOError), e:
            logger.log(u"Unable to look up show on " + show_obj.indexer + ", not downloading images: " + ex(e), logger.ERROR)
            return result

        # if we have no season banners then just finish
        if getattr(indexer_show_obj, '_banners', None) is None or 'season' not in indexer_show_obj['_banners'] or 'season' not in indexer_show_obj['_banners']['season']:
            return result

        # Give us just the normal poster-style season graphics
        seasonsArtObj = indexer_show_obj['_banners']['season']['season']

        # Returns a nested dictionary of season art with the season
        # number as primary key. It's really overkill but gives the option
        # to present to user via ui to pick down the road.

        result[season] = {}

        # find the correct season in the TVDB and TVRAGE object and just copy the dict into our result dict
        for seasonArtID in seasonsArtObj.keys():
            if int(seasonsArtObj[seasonArtID]['season']) == season and seasonsArtObj[seasonArtID]['language'] == 'en':
                result[season][seasonArtID] = seasonsArtObj[seasonArtID]['_bannerpath']

        return result

    def _season_banners_dict(self, show_obj, season):
        """
        Should return a dict like:

        result = {<season number>:
                    {1: '<url 1>', 2: <url 2>, ...},}
        """

        # This holds our resulting dictionary of season art
        result = {}

        indexer_lang = show_obj.lang

        try:
            # There's gotta be a better way of doing this but we don't wanna
            # change the language value elsewhere
            lINDEXER_API_PARMS = {'indexer': show_obj.indexer}

            lINDEXER_API_PARMS['banners'] = True

            if indexer_lang and not indexer_lang == 'en':
                lINDEXER_API_PARMS['language'] = indexer_lang

            t = indexer_api.indexerApi(**lINDEXER_API_PARMS)
            indexer_show_obj = t[show_obj.indexerid]
        except (indexer_exceptions.indexer_error, IOError), e:
            logger.log(u"Unable to look up show on " + show_obj.indexer + ", not downloading images: " + ex(e), logger.ERROR)
            return result

        # if we have no season banners then just finish
        if 'season' not in indexer_show_obj['_banners'] or 'seasonwide' not in indexer_show_obj['_banners']['season']:
            return result

        # Give us just the normal season graphics
        seasonsArtObj = indexer_show_obj['_banners']['season']['seasonwide']

        # Returns a nested dictionary of season art with the season
        # number as primary key. It's really overkill but gives the option
        # to present to user via ui to pick down the road.

        result[season] = {}

        # find the correct season in the TVDB and TVRAGE object and just copy the dict into our result dict
        for seasonArtID in seasonsArtObj.keys():
            if int(seasonsArtObj[seasonArtID]['season']) == season and seasonsArtObj[seasonArtID]['language'] == 'en':
                result[season][seasonArtID] = seasonsArtObj[seasonArtID]['_bannerpath']

        return result

    def retrieveShowMetadata(self, folder):
        """
        Used only when mass adding Existing Shows, using previously generated Show metadata to reduce the need to query TVDB.
        """

        empty_return = (None, None, None)

        metadata_path = ek.ek(os.path.join, folder, self._show_metadata_filename)

        if not ek.ek(os.path.isdir, folder) or not ek.ek(os.path.isfile, metadata_path):
            logger.log(u"Can't load the metadata file from " + repr(metadata_path) + ", it doesn't exist", logger.DEBUG)
            return empty_return

        logger.log(u"Loading show info from metadata file in " + folder, logger.DEBUG)

        try:
            with ek.ek(open, metadata_path, 'r') as xmlFileObj:
                showXML = etree.ElementTree(file=xmlFileObj)

            if showXML.findtext('title') == None\
                or (showXML.findtext('tvdbid') == None and showXML.findtext('id') == None):
                logger.log(u"Invalid info in tvshow.nfo (missing name or id):" \
                    + str(showXML.findtext('title')) + " " \
                    + str(showXML.findtext('indexer')) + " " \
                    + str(showXML.findtext('tvdbid')) + " " \
                    + str(showXML.findtext('id')))
                return empty_return

            name = showXML.findtext('title')
            indexer = showXML.findtext('indexer')
            if showXML.findtext('tvdbid') != None:
                indexer_id = int(showXML.findtext('tvdbid'))
            elif showXML.findtext('id') != None:
                indexer_id = int(showXML.findtext('id'))
            else:
                logger.log(u"Empty <id> or <tvdbid> field in NFO, unable to find a ID", logger.WARNING)
                return empty_return

            if indexer_id is None:
                logger.log(u"Invalid indexer ID (" + str(indexer_id) + "), not using metadata file", logger.WARNING)
                return empty_return

        except Exception, e:
            logger.log(u"There was an error parsing your existing metadata file: '" + metadata_path + "' error: " + ex(e), logger.WARNING)
            return empty_return

        return (indexer_id, name, indexer)