# coding=utf-8
# 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 datetime
import os
import re
import urllib
import urlparse

import sickbeard

from lib import requests
from lib.feedparser import feedparser
from sickbeard import helpers, classes, logger, db
from sickbeard.common import MULTI_EP_RESULT, SEASON_RESULT  #, SEED_POLICY_TIME, SEED_POLICY_RATIO
from sickbeard import tvcache
from sickbeard import encodingKludge as ek
from sickbeard.exceptions import ex
from lib.hachoir_parser import createParser
from sickbeard.name_parser.parser import NameParser, InvalidNameException
from sickbeard.common import Quality


class GenericProvider:
    NZB = "nzb"
    TORRENT = "torrent"

    def __init__(self, name):

        # these need to be set in the subclass
        self.providerType = None
        self.name = name
        self.url = ''

        self.show = None
        self.supportsBacklog = False

        self.cache = tvcache.TVCache(self)

        self.session = requests.session()
        self.session.verify = False
        self.session.headers.update({
            'user-agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36'})


    def getID(self):
        return GenericProvider.makeID(self.name)

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

    def imageName(self):
        return self.getID() + '.png'

    def _checkAuth(self):
        return

    def isActive(self):
        if self.providerType == GenericProvider.NZB and sickbeard.USE_NZBS:
            return self.isEnabled()
        elif self.providerType == GenericProvider.TORRENT and sickbeard.USE_TORRENTS:
            return self.isEnabled()
        else:
            return False

    def isEnabled(self):
        """
        This should be overridden and should return the config setting eg. sickbeard.MYPROVIDER
        """
        return False

    def getResult(self, episodes):
        """
        Returns a result of the correct type for this provider
        """

        if self.providerType == GenericProvider.NZB:
            result = classes.NZBSearchResult(episodes)
        elif self.providerType == GenericProvider.TORRENT:
            result = classes.TorrentSearchResult(episodes)
        else:
            result = classes.SearchResult(episodes)

        result.provider = self

        return result

    def getURL(self, url, post_data=None, headers=None, 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)
        """

        if not headers:
            headers = []

        data = helpers.getURL(url, post_data, headers, json=json)

        if not data:
            logger.log(u"Error loading " + self.name + " URL: " + url, logger.ERROR)
            return None

        return data

    def getRSSFeed(self, url, post_data=None):
        parsed = list(urlparse.urlparse(url))
        parsed[2] = re.sub("/{2,}", "/", parsed[2])  # replace two or more / with one

        if post_data:
            url = url + 'api?' + urllib.urlencode(post_data)

        f = feedparser.parse(url)

        if not f:
            logger.log(u"Error loading " + self.name + " URL: " + url, logger.ERROR)
            return None
        elif 'error' in f.feed:
            logger.log(u"Newznab ERROR:[%s] CODE:[%s]" % (f.feed['error']['description'], f.feed['error']['code']),
                       logger.DEBUG)
            return None
        elif not f.entries:
            logger.log(u"No items found on " + self.name + " using URL: " + url, logger.WARNING)
            return None

        return f

    def downloadResult(self, result):
        """
        Save the result to disk.
        """

        logger.log(u"Downloading a result from " + self.name + " at " + result.url)

        data = self.getURL(result.url)

        if data is None:
            return False

        # use the appropriate watch folder
        if self.providerType == GenericProvider.NZB:
            saveDir = sickbeard.NZB_DIR
            writeMode = 'w'
        elif self.providerType == GenericProvider.TORRENT:
            saveDir = sickbeard.TORRENT_DIR
            writeMode = 'wb'
        else:
            return False

        # use the result name as the filename
        file_name = ek.ek(os.path.join, saveDir, helpers.sanitizeFileName(result.name) + '.' + self.providerType)

        logger.log(u"Saving to " + file_name, logger.DEBUG)

        try:
            with open(file_name, writeMode) as fileOut:
                fileOut.write(data)
            helpers.chmodAsParent(file_name)
        except EnvironmentError, e:
            logger.log("Unable to save the file: " + ex(e), logger.ERROR)
            return False

        # as long as it's a valid download then consider it a successful snatch
        return self._verify_download(file_name)

    def _verify_download(self, file_name=None):
        """
        Checks the saved file to see if it was actually valid, if not then consider the download a failure.
        """

        # primitive verification of torrents, just make sure we didn't get a text file or something
        if self.providerType == GenericProvider.TORRENT:
            parser = createParser(file_name)
            if parser:
                mime_type = parser._getMimeType()
                try:
                    parser.stream._input.close()
                except:
                    pass
                if mime_type != 'application/x-bittorrent':
                    logger.log(u"Result is not a valid torrent file", logger.WARNING)
                    return False

        return True

    def searchRSS(self):

        self._checkAuth()
        self.cache.updateCache()

        return self.cache.findNeededEpisodes()

    def getQuality(self, item):
        """
        Figures out the quality of the given RSS item node
        
        item: An elementtree.ElementTree element representing the <item> tag of the RSS feed
        
        Returns a Quality value obtained from the node's data 
        """
        (title, url) = self._get_title_and_url(item)  # @UnusedVariable
        quality = Quality.sceneQuality(title)
        return quality

    def _doSearch(self, search_params, show=None, age=None):
        return []

    def _get_season_search_strings(self, episode):
        return []

    def _get_episode_search_strings(self, eb_obj, add_string=''):
        return []

    def _get_title_and_url(self, item):
        """
        Retrieves the title and URL data from the item XML node

        item: An elementtree.ElementTree element representing the <item> tag of the RSS feed

        Returns: A tuple containing two strings representing title and URL respectively
        """
        title = item.title
        if title:
            title = title.replace(' ', '.')

        url = item.link
        if url:
            url = url.replace('&amp;', '&')

        return (title, url)

    def findSearchResults(self, show, season, episodes, manualSearch=False):

        self._checkAuth()
        self.show = show

        itemList = []
        results = {}

        for epObj in episodes:
            cacheResult = self.cache.searchCache(epObj, manualSearch)
            if len(cacheResult):
                return cacheResult

            logger.log(u'Searching "%s" for "%s" as "%s"' % (self.name, epObj.prettyName(), epObj.scene_prettyName()))
            for curString in self._get_episode_search_strings(epObj):
                itemList += self._doSearch(curString)

            for item in itemList:

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

                quality = self.getQuality(item)

                # parse the file name
                try:
                    myParser = NameParser(False)
                    parse_result = myParser.parse(title)
                except InvalidNameException:
                    logger.log(u"Unable to parse the filename " + title + " into a valid episode", logger.WARNING)
                    continue

                if not (self.show.air_by_date or self.show.sports):
                if not (self.show.air_by_date or self.show.sports):
                    if (parse_result.season_number != season or epObj.episode not in parse_result.episode_numbers):
                        logger.log(u"Episode " + title + " isn't " + str(season) + "x" + str(
                            epObj.episode) + ", skipping it", logger.DEBUG)
                        continue

                else:
                    if not (parse_result.air_by_date or parse_result.sports):
                        logger.log(
                            u"This is supposed to be a date search but the result " + title + " didn't parse as one, skipping it",
                            logger.DEBUG)
                        continue

                    if ((parse_result.air_date != epObj.airdate and parse_result.air_by_date) or (
                                    parse_result.sports_event_date != epObj.airdate and parse_result.sports)):
                        logger.log(u"Episode " + title + " didn't air on " + str(epObj.airdate) + ", skipping it",
                                   logger.DEBUG)
                        continue

                # make sure we want the episode
                if not self.show.wantEpisode(epObj.season, epObj.episode, quality, manualSearch=manualSearch):
                    logger.log(
                        u"Ignoring result " + title + " because we don't want an episode that is " + Quality.qualityStrings[
                            quality], logger.DEBUG)
                    continue

                logger.log(u"Found result " + title + " at " + url, logger.DEBUG)

                # make a result object
                epObjs = [epObj]

                result = self.getResult(epObjs)
                result.url = url
                result.name = title
                result.quality = quality
                result.provider = self
                result.content = None

                if len(epObjs) == 1:
                    epNum = epObjs[0].episode
                    logger.log(u"Single episode result.", logger.DEBUG)
                elif len(epObjs) > 1:
                    epNum = MULTI_EP_RESULT
                    logger.log(u"Separating multi-episode result to check for later - result contains episodes: " + str(
                        parse_result.episode_numbers), logger.DEBUG)
                elif len(epObjs) == 0:
                    epNum = SEASON_RESULT
                    result.extraInfo = [self.show]
                    logger.log(u"Separating full season result to check for later", logger.DEBUG)

                if epNum in results:
                    results[epNum].append(result)
                else:
                    results[epNum] = [result]

            return results

    def findPropers(self, search_date=None):

        results = self.cache.listPropers(search_date)

        return [classes.Proper(x['name'], x['url'], datetime.datetime.fromtimestamp(x['time'])) for x in results]


class NZBProvider(GenericProvider):
    def __init__(self, name):
        GenericProvider.__init__(self, name)

        self.providerType = GenericProvider.NZB


class TorrentProvider(GenericProvider):
    def __init__(self, name):
        GenericProvider.__init__(self, name)

        self.providerType = GenericProvider.TORRENT