# coding=utf-8
# Author: Daniel Heimans
# 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/>.

import time
import socket
import math
import sickbeard
import generic

from sickbeard import classes
from sickbeard import scene_exceptions
from sickbeard import logger
from sickbeard import tvcache
from sickbeard.helpers import sanitizeSceneName
from sickbeard.common import cpu_presets
from sickbeard.exceptions import ex, AuthException

from lib import jsonrpclib
from datetime import datetime

class BTNProvider(generic.TorrentProvider):
    def __init__(self):
        generic.TorrentProvider.__init__(self, "BTN")

        self.supportsBacklog = True
        self.supportsAbsoluteNumbering = True

        self.enabled = False
        self.api_key = None
        self.ratio = None

        self.cache = BTNCache(self)

        self.url = "http://api.btnapps.net"

    def isEnabled(self):
        return self.enabled

    def imageName(self):
        return 'btn.png'

    def _checkAuth(self):
        if not self.api_key:
            raise AuthException("Your authentication credentials for " + self.name + " are missing, check your config.")

        return True

    def _checkAuthFromData(self, parsedJSON):

        if parsedJSON is None:
            return self._checkAuth()

        if 'api-error' in parsedJSON:
            logger.log(u"Incorrect authentication credentials for " + self.name + " : " + parsedJSON['api-error'],
                       logger.DEBUG)
            raise AuthException(
                "Your authentication credentials for " + self.name + " are incorrect, check your config.")

        return True

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

        self._checkAuth()

        params = {}
        apikey = self.api_key

        # age in seconds
        if age:
            params['age'] = "<=" + str(int(age))

        if search_params:
            params.update(search_params)

        parsedJSON = self._api_call(apikey, params)

        if not parsedJSON:
            logger.log(u"No data returned from " + self.name, logger.ERROR)
            return []

        if self._checkAuthFromData(parsedJSON):

            if 'torrents' in parsedJSON:
                found_torrents = parsedJSON['torrents']
            else:
                found_torrents = {}

            # We got something, we know the API sends max 1000 results at a time.
            # See if there are more than 1000 results for our query, if not we
            # keep requesting until we've got everything.
            # max 150 requests per hour so limit at that. Scan every 15 minutes. 60 / 15 = 4.
            max_pages = 35
            results_per_page = 1000

            if 'results' in parsedJSON and int(parsedJSON['results']) >= results_per_page:
                pages_needed = int(math.ceil(int(parsedJSON['results']) / results_per_page))
                if pages_needed > max_pages:
                    pages_needed = max_pages

                # +1 because range(1,4) = 1, 2, 3
                for page in range(1, pages_needed + 1):
                    parsedJSON = self._api_call(apikey, params, results_per_page, page * results_per_page)
                    # Note that this these are individual requests and might time out individually. This would result in 'gaps'
                    # in the results. There is no way to fix this though.
                    if 'torrents' in parsedJSON:
                        found_torrents.update(parsedJSON['torrents'])

            results = []
            for torrentid, torrent_info in found_torrents.iteritems():
                (title, url) = self._get_title_and_url(torrent_info)

                if title and url:
                    results.append(torrent_info)

            return results

        return []

    def _api_call(self, apikey, params={}, results_per_page=1000, offset=0):

        server = jsonrpclib.Server(self.url)
        parsedJSON = {}

        try:
            parsedJSON = server.getTorrents(apikey, params, int(results_per_page), int(offset))

        except jsonrpclib.jsonrpc.ProtocolError, error:
            logger.log(u"JSON-RPC protocol error while accessing " + self.name + ": " + ex(error), logger.ERROR)
            parsedJSON = {'api-error': ex(error)}
            return parsedJSON

        except socket.timeout:
            logger.log(u"Timeout while accessing " + self.name, logger.WARNING)

        except socket.error, error:
            # Note that sometimes timeouts are thrown as socket errors
            logger.log(u"Socket error while accessing " + self.name + ": " + error[1], logger.ERROR)

        except Exception, error:
            errorstring = str(error)
            if (errorstring.startswith('<') and errorstring.endswith('>')):
                errorstring = errorstring[1:-1]
            logger.log(u"Unknown error while accessing " + self.name + ": " + errorstring, logger.ERROR)

        return parsedJSON

    def _get_title_and_url(self, parsedJSON):

        # The BTN API gives a lot of information in response,
        # however SickRage is built mostly around Scene or
        # release names, which is why we are using them here.

        if 'ReleaseName' in parsedJSON and parsedJSON['ReleaseName']:
            title = parsedJSON['ReleaseName']

        else:
            # If we don't have a release name we need to get creative
            title = u''
            if 'Series' in parsedJSON:
                title += parsedJSON['Series']
            if 'GroupName' in parsedJSON:
                title += '.' + parsedJSON['GroupName'] if title else parsedJSON['GroupName']
            if 'Resolution' in parsedJSON:
                title += '.' + parsedJSON['Resolution'] if title else parsedJSON['Resolution']
            if 'Source' in parsedJSON:
                title += '.' + parsedJSON['Source'] if title else parsedJSON['Source']
            if 'Codec' in parsedJSON:
                title += '.' + parsedJSON['Codec'] if title else parsedJSON['Codec']
            if title:
                title = title.replace(' ', '.')

        url = None
        if 'DownloadURL' in parsedJSON:
            url = parsedJSON['DownloadURL']
            if url:
                # unescaped / is valid in JSON, but it can be escaped
                url = url.replace("\\/", "/")

        return (title, url)

    def _get_season_search_strings(self, ep_obj):
        search_params = []

        name_exceptions = scene_exceptions.get_scene_exceptions(self.show.indexerid) + [self.show.name]
        for name in name_exceptions:

            current_params = {}

            if self.show.indexer == 1:
                current_params['tvdb'] = self.show.indexerid
            elif self.show.indexer == 2:
                current_params['tvrage'] = self.show.indexerid
            else:
                # Search by name if we don't have tvdb or tvrage id
                current_params['series'] = sanitizeSceneName(name)

            # Search for entire seasons: no need to do special things for air by date shows
            whole_season_params = current_params.copy()

            # Search for entire seasons: no need to do special things for air by date shows
            whole_season_params['category'] = 'Season'
            if ep_obj.show.air_by_date or ep_obj.show.sports:
                # Search for the year of the air by date show
                whole_season_params['name'] = str(ep_obj.airdate).split('-')[0]
            elif ep_obj.show.is_anime:
                whole_season_params['name'] = "%d" % ep_obj.scene_absolute_number
            else:
                whole_season_params['name'] = 'Season ' + str(ep_obj.scene_season)

            search_params.append(whole_season_params)

        return search_params

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

        if not ep_obj:
            return [{}]

        search_params = {'category': 'Episode'}

        if self.show.indexer == 1:
            search_params['tvdb'] = self.show.indexerid
        elif self.show.indexer == 2:
            search_params['tvrage'] = self.show.indexerid
        else:
            search_params['series'] = sanitizeSceneName(self.show.name)

        if self.show.air_by_date:
            date_str = str(ep_obj.airdate)

            # BTN uses dots in dates, we just search for the date since that
            # combined with the series identifier should result in just one episode
            search_params['name'] = date_str.replace('-', '.')
        elif self.show.sports:
            date_str = str(ep_obj.airdate)

            # BTN uses dots in dates, we just search for the date since that
            # combined with the series identifier should result in just one episode
            search_params['name'] = ep_obj.airdate.strftime('%b')
        elif self.show.anime:
            search_params['name'] = "%i" % int(ep_obj.scene_absolute_number)
        else:
            # Do a general name search for the episode, formatted like SXXEYY
            search_params['name'] = "S%02dE%02d" % (ep_obj.scene_season, ep_obj.scene_episode)

        to_return = [search_params]

        # only do scene exceptions if we are searching by name
        if 'series' in search_params:

            # add new query string for every exception
            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

                # copy all other parameters before setting the show name for this exception
                cur_return = search_params.copy()
                cur_return['series'] = sanitizeSceneName(cur_exception)
                to_return.append(cur_return)

        return to_return

    def _doGeneralSearch(self, search_string):
        # 'search' looks as broad is it can find. Can contain episode overview and title for example,
        # use with caution!
        return self._doSearch({'search': search_string})

    def findPropers(self, search_date=None):
        results = []

        search_terms = ['%.proper.%', '%.repack.%']

        for term in search_terms:
            for item in self._doSearch({'release': term}, age=4 * 24 * 60 * 60):
                if item['Time']:
                    try:
                        result_date = datetime.fromtimestamp(float(item['Time']))
                    except TypeError:
                        result_date = None

                    if result_date:
                        if not search_date or result_date > search_date:
                            title, url = self._get_title_and_url(item)
                            results.append(classes.Proper(title, url, result_date))

        return results

    def seedRatio(self):
        return self.ratio

class BTNCache(tvcache.TVCache):
    def __init__(self, provider):
        tvcache.TVCache.__init__(self, provider)

            # At least 15 minutes between queries
        self.minTime = 15

    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 we got something from the provider we count it as an update
            if data:
                self.setLastUpdate()
            else:
                return []

            if self._checkAuth(data):
                # By now we know we've got data and no auth errors, all we need to do is put it in the database
                cl = []
                for item in data:

                    ci = self._parseItem(item)
                    if ci is not None:
                        cl.append(ci)

                if cl:
                    with self._getDB() as myDB:
                        myDB.mass_action(cl)

            else:
                raise AuthException(
                    "Your authentication info for " + self.provider.name + " is incorrect, check your config")
        else:
            return []

    def _getRSSData(self):
        # Get the torrents uploaded since last check.
        seconds_since_last_update = math.ceil(time.time() - time.mktime(self._getLastUpdate().timetuple()))

        # default to 15 minutes
        seconds_minTime = self.minTime * 60
        if seconds_since_last_update < seconds_minTime:
            seconds_since_last_update = seconds_minTime

        # Set maximum to 24 hours (24 * 60 * 60 = 86400 seconds) of "RSS" data search, older things will need to be done through backlog
        if seconds_since_last_update > 86400:
            logger.log(
                u"The last known successful update on " + self.provider.name + " was more than 24 hours ago, only trying to fetch the last 24 hours!",
                logger.WARNING)
            seconds_since_last_update = 86400

        return self.provider._doSearch(search_params=None, age=seconds_since_last_update)

    def _parseItem(self, item):
        (title, url) = self.provider._get_title_and_url(item)

        if title and url:
            logger.log(u"Adding item to results: " + title, logger.DEBUG)
            return self._addCacheEntry(title, url)
        else:
            logger.log(u"The data returned from the " + self.provider.name + " is incomplete, this result is unusable",
                       logger.ERROR)
            return None

    def _checkAuth(self, data):
        return self.provider._checkAuthFromData(data)

provider = BTNProvider()