# coding=utf-8
# 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/>.

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, InvalidShowException
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.supportsAbsoluteNumbering = False
        self.anime_only = 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, anime=False):
        """
        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, anime)
        return quality

    def _doSearch(self, search_params, search_mode='eponly', 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 = u'' + 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 = {}
        itemList = []

        searched_scene_season = None
        for epObj in episodes:
            # check cache for results
            cacheResult = self.cache.searchCache([epObj], manualSearch)
            if len(cacheResult):
                results.update({epObj.episode: cacheResult[epObj]})
                continue

            # skip if season already searched
            if len(episodes) > 1 and 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 len(episodes) > 1:
                # get season search results
                for curString in self._get_season_search_strings(epObj):
                    itemList += self._doSearch(curString, search_mode, len(episodes))
            else:
                # get single episode search results
                for curString in self._get_episode_search_strings(epObj):
                    itemList += self._doSearch(curString, 'eponly', len(episodes))

        # if we found what we needed already from cache then return results and exit
        if len(results) == len(episodes):
            return results

        # filter results
        for item in itemList:
            (title, url) = self._get_title_and_url(item)

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

            showObj = parse_result.show
            quality = parse_result.quality
            release_group = parse_result.release_group

            if not (showObj.air_by_date or showObj.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 != season) or (
                                parse_result.season_number == None and season != 1):
                    logger.log(u"The result " + title + " doesn't seem to be a valid season for season " + str(season) + ", ignoring", logger.DEBUG)
                    continue
                elif len(parse_result.episode_numbers) and (
                                parse_result.season_number != season or parse_result.episode_numbers[0] not in episodes):
                    logger.log(u"Episode " + title + " isn't " + str(season) + "x" + str(parse_result.episode_numbers[0]) + ", skipping it", logger.DEBUG)
                    continue

                # we just use the existing info for normal searches
                actual_season = season
                actual_episodes = parse_result.episode_numbers
            else:
                if not (parse_result.is_air_by_date or parse_result.is_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

                airdate = parse_result.air_date.toordinal() if parse_result.air_date else parse_result.is_sports_air_date.toordinal()
                myDB = db.DBConnection()
                sql_results = myDB.select(
                    "SELECT season, episode FROM tv_episodes WHERE showid = ? AND airdate = ?",
                    [showObj.indexerid, airdate])

                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 showObj.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(showObj.getEpisode(actual_season, curEp))

            result = self.getResult(epObj)
            result.show = showObj
            result.url = url
            result.name = title
            result.quality = quality
            result.release_group = release_group
            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']), self.show) 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