# 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 time

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, cpu_presets
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.search_mode = None
        self.search_fallback = False
        self.backlog_only = 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 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, episodes):
        return self.cache.findNeededEpisodes(episodes)

    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, epcount=0, age=0):
        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 item.title else None
        if title:
            title = title.replace(' ', '.')

        url = item.link if item.link else None
        if url:
            url = url.replace('&amp;', '&')

        return (title, url)

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

        self._checkAuth()
        self.show = show

        results = {}
        searchItems = {}

        searched_scene_season = None
        for epObj in episodes:
            itemList = []

            if search_mode == 'sponly' and searched_scene_season:
                if searched_scene_season == epObj.scene_season:
                    continue

            # mark season searched for season pack searches so we can skip later on
            searched_scene_season = epObj.scene_season

            if not epObj.show.air_by_date:
                if epObj.scene_season == 0 or epObj.scene_episode == 0:
                    logger.log(
                        u"Incomplete Indexer <-> Scene mapping detected for " + epObj.prettyName() + ", skipping search!")
                    continue

            #cacheResult = self.cache.searchCache([epObj], manualSearch)
            #if len(cacheResult):
            #    results.update({epObj.episode:cacheResult[epObj]})
            #    continue

            if search_mode == 'sponly':
                for curString in self._get_season_search_strings(epObj):
                    itemList += self._doSearch(curString, len(episodes))
            else:
                for curString in self._get_episode_search_strings(epObj):
                    itemList += self._doSearch(curString, len(episodes))

            # next episode if no search results
            if not len(itemList):
                continue

            # remove duplicate items
            #itemList = [i for n, i in enumerate(itemList) if i not in itemList[n + 1:]]
            searchItems[epObj] = itemList

        # if we have cached results return them.
        #if len(results):
        #    return results

        for ep_obj in searchItems:
            for item in searchItems[ep_obj]:

                (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

                # scene -> indexer numbering
                parse_result = parse_result.convert(self.show)

                if not (self.show.air_by_date or self.show.sports):
                    if search_mode == 'sponly' and len(parse_result.episode_numbers):
                        logger.log(
                            u"This is supposed to be a season pack search but the result " + title + " is not a valid season pack, skipping it",
                            logger.DEBUG)
                        continue

                    if not len(parse_result.episode_numbers) and (
                                    parse_result.season_number != None and parse_result.season_number != ep_obj.season) or (
                                    parse_result.season_number == None and ep_obj.season != 1):
                        logger.log(u"The result " + title + " doesn't seem to be a valid season for season " + str(
                            ep_obj.season) + ", ignoring", logger.DEBUG)
                        continue
                    elif len(parse_result.episode_numbers) and (
                                    parse_result.season_number != ep_obj.season or ep_obj.episode not in parse_result.episode_numbers):
                        logger.log(u"Episode " + title + " isn't " + str(ep_obj.season) + "x" + str(
                            ep_obj.episode) + ", skipping it", logger.DEBUG)
                        continue

                    # we just use the existing info for normal searches
                    actual_season = ep_obj.season
                    actual_episodes = parse_result.episode_numbers
                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_by_date and parse_result.air_date != ep_obj.airdate) or (
                        parse_result.sports and parse_result.sports_event_date != ep_obj.airdate):
                        logger.log("Episode " + title + " didn't air on " + str(ep_obj.airdate) + ", skipping it",
                                   logger.DEBUG)
                        continue

                    myDB = db.DBConnection()
                    sql_results = myDB.select(
                        "SELECT season, episode FROM tv_episodes WHERE showid = ? AND airdate = ?",
                        [show.indexerid,
                         parse_result.air_date.toordinal() or parse_result.sports_event_date.toordinal()])

                    if len(sql_results) != 1:
                        logger.log(
                            u"Tried to look up the date for the episode " + title + " but the database didn't give proper results, skipping it",
                            logger.WARNING)
                        continue

                    actual_season = int(sql_results[0]["season"])
                    actual_episodes = [int(sql_results[0]["episode"])]

                # make sure we want the episode
                wantEp = True
                for epNo in actual_episodes:
                    if not show.wantEpisode(actual_season, epNo, quality, manualSearch):
                        wantEp = False
                        break

                if not wantEp:
                    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
                epObj = []
                for curEp in actual_episodes:
                    epObj.append(show.getEpisode(actual_season, curEp))

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

                if len(epObj) == 1:
                    epNum = epObj[0].episode
                    logger.log(u"Single episode result.", logger.DEBUG)
                elif len(epObj) > 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(epObj) == 0:
                    epNum = SEASON_RESULT
                    logger.log(u"Separating full season result to check for later", logger.DEBUG)

                if not result:
                    continue

                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]

    def seedRatio(self):
        '''
        Provider should override this value if custom seed ratio enabled
        It should return the value of the provider seed ratio
        '''
        return ''


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