# 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 time
import datetime
import sickbeard

from sickbeard import db
from sickbeard import logger
from sickbeard.common import Quality

from sickbeard import helpers, show_name_helpers
from sickbeard.exceptions import MultipleShowObjectsException
from sickbeard.exceptions import AuthException
from name_parser.parser import NameParser, InvalidNameException, InvalidShowException
from sickbeard.rssfeeds import RSSFeeds

class CacheDBConnection(db.DBConnection):
    def __init__(self, providerName):
        db.DBConnection.__init__(self, "cache.db")

        # Create the table if it's not already there
        try:
            if not self.hasTable(providerName):
                self.action(
                    "CREATE TABLE [" + providerName + "] (name TEXT, season NUMERIC, episodes TEXT, indexerid NUMERIC, url TEXT, time NUMERIC, quality TEXT, release_group TEXT)")
            else:
                sqlResults = self.select(
                    "SELECT url, COUNT(url) as count FROM [" + providerName + "] GROUP BY url HAVING count > 1")

                for cur_dupe in sqlResults:
                    self.action("DELETE FROM [" + providerName + "] WHERE url = ?", [cur_dupe["url"]])

            # add unique index to prevent further dupes from happening if one does not exist
            self.action("CREATE UNIQUE INDEX IF NOT EXISTS idx_url ON " + providerName + " (url)")

            # add release_group column to table if missing
            if not self.hasColumn(providerName, 'release_group'):
                self.addColumn(providerName, 'release_group', "TEXT", "")

        except Exception, e:
            if str(e) != "table [" + providerName + "] already exists":
                raise

        # Create the table if it's not already there
        try:
            if not self.hasTable('lastUpdate'):
                self.action("CREATE TABLE lastUpdate (provider TEXT, time NUMERIC)")
        except Exception, e:
            if str(e) != "table lastUpdate already exists":
                raise

class TVCache():
    def __init__(self, provider):

        self.provider = provider
        self.providerID = self.provider.getID()
        self.providerDB = None
        self.minTime = 10

    def _getDB(self):
        # init provider database if not done already
        if not self.providerDB:
            self.providerDB = CacheDBConnection(self.providerID)

        return self.providerDB

    def _clearCache(self):
        if self.shouldClearCache():
            logger.log(u"Clearing items older than 1 week from " + self.provider.name + " cache")

            curDate = datetime.date.today() - datetime.timedelta(weeks=1)

            myDB = self._getDB()
            myDB.action("DELETE FROM [" + self.providerID + "] WHERE time < ?", [int(time.mktime(curDate.timetuple()))])

    def _getRSSData(self):

        data = None

        return data

    def _checkAuth(self, data):
        return True

    def _checkItemAuth(self, title, url):
        return True

    def updateCache(self):

        if self.shouldUpdate() and self._checkAuth(None):
            # as long as the http request worked we count this as an update
            data = self._getRSSData()
            if not data:
                return []

            # clear cache
            self._clearCache()

            # set updated
            self.setLastUpdate()

            # parse data
            if self._checkAuth(data):
                cl = []
                for item in data.entries:
                    ci = self._parseItem(item)
                    if ci is not None:
                        cl.append(ci)

                if len(cl) > 0:
                    myDB = self._getDB()
                    myDB.mass_action(cl)
            else:
                raise AuthException(
                    u"Your authentication credentials for " + self.provider.name + " are incorrect, check your config")

        return []

    def getRSSFeed(self, url, post_data=None, request_headers=None):
        return RSSFeeds(self.providerID).getFeed(url, post_data, request_headers)

    def _translateTitle(self, title):
        return u'' + title.replace(' ', '.')

    def _translateLinkURL(self, url):
        return url.replace('&amp;', '&')

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

        self._checkItemAuth(title, url)

        if title and url:
            title = self._translateTitle(title)
            url = self._translateLinkURL(url)

            logger.log(u"Checking if item from RSS feed is in the cache: " + title, logger.DEBUG)
            return self._addCacheEntry(title, url)

        else:
            logger.log(
                u"The data returned from the " + self.provider.name + " feed is incomplete, this result is unusable",
                logger.DEBUG)
            return None


    def _getLastUpdate(self):
        myDB = self._getDB()
        sqlResults = myDB.select("SELECT time FROM lastUpdate WHERE provider = ?", [self.providerID])

        if sqlResults:
            lastTime = int(sqlResults[0]["time"])
            if lastTime > int(time.mktime(datetime.datetime.today().timetuple())):
                lastTime = 0
        else:
            lastTime = 0

        return datetime.datetime.fromtimestamp(lastTime)

    def _getLastSearch(self):
        myDB = self._getDB()
        sqlResults = myDB.select("SELECT time FROM lastSearch WHERE provider = ?", [self.providerID])

        if sqlResults:
            lastTime = int(sqlResults[0]["time"])
            if lastTime > int(time.mktime(datetime.datetime.today().timetuple())):
                lastTime = 0
        else:
            lastTime = 0

        return datetime.datetime.fromtimestamp(lastTime)


    def setLastUpdate(self, toDate=None):
        if not toDate:
            toDate = datetime.datetime.today()

        myDB = self._getDB()
        myDB.upsert("lastUpdate",
                    {'time': int(time.mktime(toDate.timetuple()))},
                    {'provider': self.providerID})

    def setLastSearch(self, toDate=None):
        if not toDate:
            toDate = datetime.datetime.today()

        myDB = self._getDB()
        myDB.upsert("lastSearch",
                    {'time': int(time.mktime(toDate.timetuple()))},
                    {'provider': self.providerID})

    lastUpdate = property(_getLastUpdate)
    lastSearch = property(_getLastSearch)

    def shouldUpdate(self):
        # if we've updated recently then skip the update
        if datetime.datetime.today() - self.lastUpdate < datetime.timedelta(minutes=self.minTime):
            logger.log(u"Last update was too soon, using old cache: today()-" + str(self.lastUpdate) + "<" + str(
                datetime.timedelta(minutes=self.minTime)), logger.DEBUG)
            return False

        return True

    def shouldClearCache(self):
        # if daily search hasn't used our previous results yet then don't clear the cache
        if self.lastUpdate > self.lastSearch:
            logger.log(
                u"Daily search has not yet used our last cache results, not clearing cache ...", logger.DEBUG)
            return False

        return True

    def _addCacheEntry(self, name, url, parse_result=None, indexer_id=0):

        # check if we passed in a parsed result or should we try and create one
        if not parse_result:

            # create showObj from indexer_id if available
            showObj=None
            if indexer_id:
                showObj = helpers.findCertainShow(sickbeard.showList, indexer_id)

            try:
                myParser = NameParser(showObj=showObj, convert=True)
                parse_result = myParser.parse(name)
            except InvalidNameException:
                logger.log(u"Unable to parse the filename " + name + " into a valid episode", logger.DEBUG)
                return None
            except InvalidShowException:
                logger.log(u"Unable to parse the filename " + name + " into a valid show", logger.DEBUG)
                return None

            if not parse_result or not parse_result.series_name:
                return None

        # if we made it this far then lets add the parsed result to cache for usager later on
        season = parse_result.season_number if parse_result.season_number else 1
        episodes = parse_result.episode_numbers

        if season and episodes:
            # store episodes as a seperated string
            episodeText = "|" + "|".join(map(str, episodes)) + "|"

            # get the current timestamp
            curTimestamp = int(time.mktime(datetime.datetime.today().timetuple()))

            # get quality of release
            quality = parse_result.quality

            if not isinstance(name, unicode):
                name = unicode(name, 'utf-8', 'replace')

            # get release group
            release_group = parse_result.release_group

            logger.log(u"Added RSS item: [" + name + "] to cache: [" + self.providerID + "]", logger.DEBUG)

            return [
                "INSERT OR IGNORE INTO [" + self.providerID + "] (name, season, episodes, indexerid, url, time, quality, release_group) VALUES (?,?,?,?,?,?,?,?)",
                [name, season, episodeText, parse_result.show.indexerid, url, curTimestamp, quality, release_group]]


    def searchCache(self, episodes, manualSearch=False):
        neededEps = self.findNeededEpisodes(episodes, manualSearch)
        return neededEps

    def listPropers(self, date=None, delimiter="."):
        myDB = self._getDB()
        sql = "SELECT * FROM [" + self.providerID + "] WHERE name LIKE '%.PROPER.%' OR name LIKE '%.REPACK.%'"

        if date != None:
            sql += " AND time >= " + str(int(time.mktime(date.timetuple())))

        return filter(lambda x: x['indexerid'] != 0, myDB.select(sql))


    def findNeededEpisodes(self, episodes, manualSearch=False):
        neededEps = {}

        for epObj in episodes:
            myDB = self._getDB()
            sqlResults = myDB.select(
                "SELECT * FROM [" + self.providerID + "] WHERE indexerid = ? AND season = ? AND episodes LIKE ?",
                [epObj.show.indexerid, epObj.season, "%|" + str(epObj.episode) + "|%"])

            # for each cache entry
            for curResult in sqlResults:

                # skip non-tv crap (but allow them for Newzbin cause we assume it's filtered well)
                if self.providerID != 'newzbin' and not show_name_helpers.filterBadReleases(curResult["name"]):
                    continue

                # get the show object, or if it's not one of our shows then ignore it
                try:
                    showObj = helpers.findCertainShow(sickbeard.showList, int(curResult["indexerid"]))
                except MultipleShowObjectsException:
                    showObj = None

                if not showObj:
                    continue

                # get season and ep data (ignoring multi-eps for now)
                curSeason = int(curResult["season"])
                if curSeason == -1:
                    continue
                curEp = curResult["episodes"].split("|")[1]
                if not curEp:
                    continue
                curEp = int(curEp)
                curQuality = int(curResult["quality"])
                curReleaseGroup = curResult["release_group"]

                # if the show says we want that episode then add it to the list
                if not showObj.wantEpisode(curSeason, curEp, curQuality, manualSearch):
                    logger.log(u"Skipping " + curResult["name"] + " because we don't want an episode that's " +
                               Quality.qualityStrings[curQuality], logger.DEBUG)
                    continue

                # build a result object
                title = curResult["name"]
                url = curResult["url"]

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

                result = self.provider.getResult([epObj])
                result.show = showObj
                result.url = url
                result.name = title
                result.quality = curQuality
                result.release_group = curReleaseGroup
                result.content = self.provider.getURL(url) \
                    if self.provider.providerType == sickbeard.providers.generic.GenericProvider.TORRENT \
                       and not url.startswith('magnet') else None

                # add it to the list
                if epObj not in neededEps:
                    neededEps[epObj] = [result]
                else:
                    neededEps[epObj].append(result)

        # datetime stamp this search so cache gets cleared
        self.setLastSearch()

        return neededEps