# 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 traceback
import threading
import Queue

import sickbeard

from lib.imdb import _exceptions as imdb_exceptions
from sickbeard.common import SKIPPED, WANTED
from sickbeard.tv import TVShow
from sickbeard import exceptions, logger, ui, db
from sickbeard import generic_queue
from sickbeard import name_cache
from sickbeard.exceptions import ex

show_queue_lock = threading.Lock()

class ShowQueue(generic_queue.GenericQueue):
    def __init__(self):

        generic_queue.GenericQueue.__init__(self)
        self.queue_name = "SHOWQUEUE"

    def _isInQueue(self, show, actions):
        shows = [x.show for x in self.queue.queue if x.action_id in actions] if not self.queue.empty() else []
        if self.currentItem != None and self.currentItem.action_id in actions:
            shows.append(self.currentItem)

        return show in shows

    def _isBeingSomethinged(self, show, actions):
        return self.currentItem != None and show == self.currentItem.show and \
               self.currentItem.action_id in actions

    def isInUpdateQueue(self, show):
        return self._isInQueue(show, (ShowQueueActions.UPDATE, ShowQueueActions.FORCEUPDATE))

    def isInRefreshQueue(self, show):
        return self._isInQueue(show, (ShowQueueActions.REFRESH,))

    def isInRenameQueue(self, show):
        return self._isInQueue(show, (ShowQueueActions.RENAME,))

    def isInSubtitleQueue(self, show):
        return self._isInQueue(show, (ShowQueueActions.SUBTITLE,))

    def isBeingAdded(self, show):
        return self._isBeingSomethinged(show, (ShowQueueActions.ADD,))

    def isBeingUpdated(self, show):
        return self._isBeingSomethinged(show, (ShowQueueActions.UPDATE, ShowQueueActions.FORCEUPDATE))

    def isBeingRefreshed(self, show):
        return self._isBeingSomethinged(show, (ShowQueueActions.REFRESH,))

    def isBeingRenamed(self, show):
        return self._isBeingSomethinged(show, (ShowQueueActions.RENAME,))

    def isBeingSubtitled(self, show):
        return self._isBeingSomethinged(show, (ShowQueueActions.SUBTITLE,))

    def _getLoadingShowList(self):
        shows = [x for x in self.queue.queue if x != None and x.isLoading] if not self.queue.empty() else []
        if self.currentItem != None and self.currentItem.isLoading:
            shows.append(self.currentItem)
        return shows


    loadingShowList = property(_getLoadingShowList)

    def updateShow(self, show, force=False):

        if self.isBeingAdded(show):
            raise exceptions.CantUpdateException(
                "Show is still being added, wait until it is finished before you update.")

        if self.isBeingUpdated(show):
            raise exceptions.CantUpdateException(
                "This show is already being updated, can't update again until it's done.")

        if self.isInUpdateQueue(show):
            raise exceptions.CantUpdateException(
                "This show is already being updated, can't update again until it's done.")

        if not force:
            queueItemObj = QueueItemUpdate(show)
        else:
            queueItemObj = QueueItemForceUpdate(show)

        self.add_item(queueItemObj)

        return queueItemObj

    def refreshShow(self, show, force=False):

        if self.isBeingRefreshed(show) and not force:
            raise exceptions.CantRefreshException("This show is already being refreshed, not refreshing again.")

        if (self.isBeingUpdated(show) or self.isInUpdateQueue(show)) and not force:
            logger.log(
                u"A refresh was attempted but there is already an update queued or in progress. Since updates do a refres at the end anyway I'm skipping this request.",
                logger.DEBUG)
            return

        queueItemObj = QueueItemRefresh(show)

        self.add_item(queueItemObj)

        return queueItemObj

    def renameShowEpisodes(self, show, force=False):

        queueItemObj = QueueItemRename(show)

        self.add_item(queueItemObj)

        return queueItemObj

    def downloadSubtitles(self, show, force=False):

        queueItemObj = QueueItemSubtitle(show)

        self.add_item(queueItemObj)

        return queueItemObj

    def addShow(self, indexer, indexer_id, showDir, default_status=None, quality=None, flatten_folders=None,
                subtitles=None, lang="en", refresh=False):
        queueItemObj = QueueItemAdd(indexer, indexer_id, showDir, default_status, quality, flatten_folders, lang,
                                    subtitles, refresh)

        self.add_item(queueItemObj)

        return queueItemObj


class ShowQueueActions:
    REFRESH = 1
    ADD = 2
    UPDATE = 3
    FORCEUPDATE = 4
    RENAME = 5
    SUBTITLE = 6

    names = {REFRESH: 'Refresh',
             ADD: 'Add',
             UPDATE: 'Update',
             FORCEUPDATE: 'Force Update',
             RENAME: 'Rename',
             SUBTITLE: 'Subtitle',
    }


class ShowQueueItem(generic_queue.QueueItem):
    """
    Represents an item in the queue waiting to be executed

    Can be either:
    - show being added (may or may not be associated with a show object)
    - show being refreshed
    - show being updated
    - show being force updated
    - show being subtitled
    """

    def __init__(self, action_id, show):
        generic_queue.QueueItem.__init__(self, ShowQueueActions.names[action_id], action_id)
        self.show = show

    def isInQueue(self):
        queue = [x for x in sickbeard.showQueueScheduler.action.queue.queue]
        queue.append(sickbeard.showQueueScheduler.action.currentItem)
        return self in queue

    def _getName(self):
        return str(self.show.indexerid)

    def _isLoading(self):
        return False

    show_name = property(_getName)

    isLoading = property(_isLoading)


class QueueItemAdd(ShowQueueItem):
    def __init__(self, indexer, indexer_id, showDir, default_status, quality, flatten_folders, lang, subtitles,
                 refresh):

        self.indexer = indexer
        self.indexer_id = indexer_id
        self.showDir = showDir
        self.default_status = default_status
        self.quality = quality
        self.flatten_folders = flatten_folders
        self.lang = lang
        self.subtitles = subtitles
        self.refresh = refresh

        self.show = None

        # this will initialize self.show to None
        ShowQueueItem.__init__(self, ShowQueueActions.ADD, self.show)

    def _getName(self):
        """
        Returns the show name if there is a show object created, if not returns
        the dir that the show is being added to.
        """
        if self.show == None:
            return self.showDir
        return self.show.name

    show_name = property(_getName)

    def _isLoading(self):
        """
        Returns True if we've gotten far enough to have a show object, or False
        if we still only know the folder name.
        """
        if self.show == None:
            return True
        return False

    isLoading = property(_isLoading)

    def execute(self):

        ShowQueueItem.execute(self)

        logger.log(u"Starting to add show " + self.showDir)
        # make sure the Indexer IDs are valid
        try:

            lINDEXER_API_PARMS = sickbeard.indexerApi(self.indexer).api_params.copy()
            if self.lang:
                lINDEXER_API_PARMS['language'] = self.lang

            logger.log(u"" + str(sickbeard.indexerApi(self.indexer).name) + ": " + repr(lINDEXER_API_PARMS))

            t = sickbeard.indexerApi(self.indexer).indexer(**lINDEXER_API_PARMS)
            s = t[self.indexer_id]

            # this usually only happens if they have an NFO in their show dir which gave us a Indexer ID that has no proper english version of the show
            if getattr(s, 'seriesname', None) is None:
                logger.log(u"Show in " + self.showDir + " has no name on " + str(sickbeard.indexerApi(self.indexer).name) + ", probably the wrong language used to search with.", logger.ERROR)
                ui.notifications.error("Unable to add show",
                                       "Show in " + self.showDir + " has no name on " + str(sickbeard.indexerApi(
                                           self.indexer).name) + ", probably the wrong language. Delete .nfo and add manually in the correct language.")
                self._finishEarly()
                return
            # if the show has no episodes/seasons
            if not s:
                logger.log(u"Show " + str(s['seriesname']) + " is on " + str(sickbeard.indexerApi(self.indexer).name) + " but contains no season/episode data.", logger.ERROR)
                ui.notifications.error("Unable to add show",
                                       "Show " + str(s['seriesname']) + " is on " + str(sickbeard.indexerApi(
                                           self.indexer).name) + " but contains no season/episode data.")
                self._finishEarly()
                return
        except Exception, e:
            logger.log(u"Unable to find show ID:" + str(self.indexer_id) + " on Indexer: " + str(sickbeard.indexerApi(self.indexer).name), logger.ERROR)
            ui.notifications.error("Unable to add show",
                                   "Unable to look up the show in " + self.showDir + " on " + str(sickbeard.indexerApi(
                                       self.indexer).name) + " using ID " + str(
                                       self.indexer_id) + ", not using the NFO. Delete .nfo and try adding manually again.")
            self._finishEarly()
            return

        try:
            # clear the name cache
            name_cache.clearCache()

            newShow = TVShow(self.indexer, self.indexer_id, self.lang)
            newShow.loadFromIndexer()

            self.show = newShow

            # set up initial values
            self.show.location = self.showDir
            self.show.subtitles = self.subtitles if self.subtitles != None else sickbeard.SUBTITLES_DEFAULT
            self.show.quality = self.quality if self.quality else sickbeard.QUALITY_DEFAULT
            self.show.flatten_folders = self.flatten_folders if self.flatten_folders != None else sickbeard.FLATTEN_FOLDERS_DEFAULT
            self.show.paused = False

            # be smartish about this
            if self.show.genre and "talk show" in self.show.genre.lower():
                self.show.air_by_date = 1
            elif self.show.classification and "sports" in self.show.classification.lower():
                self.show.sports = 1


        except sickbeard.indexer_exception, e:
            logger.log(
                u"Unable to add show due to an error with " + sickbeard.indexerApi(self.indexer).name + ": " + ex(e),
                logger.ERROR)
            if self.show:
                ui.notifications.error(
                    "Unable to add " + str(self.show.name) + " due to an error with " + sickbeard.indexerApi(
                        self.indexer).name + "")
            else:
                ui.notifications.error(
                    "Unable to add show due to an error with " + sickbeard.indexerApi(self.indexer).name + "")
            self._finishEarly()
            return

        except exceptions.MultipleShowObjectsException:
            logger.log(u"The show in " + self.showDir + " is already in your show list, skipping", logger.ERROR)
            ui.notifications.error('Show skipped', "The show in " + self.showDir + " is already in your show list")
            self._finishEarly()
            return

        except Exception, e:
            logger.log(u"Error trying to add show: " + ex(e), logger.ERROR)
            logger.log(traceback.format_exc(), logger.DEBUG)
            self._finishEarly()
            raise

        logger.log(u"Retrieving show info from IMDb", logger.DEBUG)
        try:
            self.show.loadIMDbInfo()
        except imdb_exceptions.IMDbError, e:
            #todo Insert UI notification
            logger.log(u" Something wrong on IMDb api: " + ex(e), logger.WARNING)
        except Exception, e:
            logger.log(u"Error loading IMDb info: " + ex(e), logger.ERROR)

        try:
            self.show.saveToDB()
        except Exception, e:
            logger.log(u"Error saving the show to the database: " + ex(e), logger.ERROR)
            logger.log(traceback.format_exc(), logger.DEBUG)
            self._finishEarly()
            raise

        # add it to the show list
        sickbeard.showList.append(self.show)

        try:
            self.show.loadEpisodesFromIndexer()
        except Exception, e:
            logger.log(
                u"Error with " + sickbeard.indexerApi(self.show.indexer).name + ", not creating episode list: " + ex(e),
                logger.ERROR)
            logger.log(traceback.format_exc(), logger.DEBUG)

        try:
            self.show.loadEpisodesFromDir()
        except Exception, e:
            logger.log(u"Error searching dir for episodes: " + ex(e), logger.ERROR)
            logger.log(traceback.format_exc(), logger.DEBUG)

        # if they gave a custom status then change all the eps to it
        if self.default_status != SKIPPED:
            logger.log(u"Setting all episodes to the specified default status: " + str(self.default_status))
            myDB = db.DBConnection()
            myDB.action("UPDATE tv_episodes SET status = ? WHERE status = ? AND showid = ? AND season != 0",
                        [self.default_status, SKIPPED, self.show.indexerid])

        # if they started with WANTED eps then run the backlog
        if self.default_status == WANTED:
            logger.log(u"Launching backlog for this show since its episodes are WANTED")
            sickbeard.backlogSearchScheduler.action.searchBacklog([self.show])  #@UndefinedVariable

        self.show.writeMetadata(force=self.refresh)
        self.show.populateCache()

        self.show.flushEpisodes()

        # if there are specific episodes that need to be added by trakt
        sickbeard.traktWatchListCheckerSchedular.action.manageNewShow(self.show)

        self.finish()

    def _finishEarly(self):
        if self.show != None:
            self.show.deleteShow()

        self.finish()


class QueueItemRefresh(ShowQueueItem):
    def __init__(self, show=None):
        ShowQueueItem.__init__(self, ShowQueueActions.REFRESH, show)

        # do refreshes first because they're quick
        self.priority = generic_queue.QueuePriorities.HIGH

    def execute(self):
        ShowQueueItem.execute(self)

        logger.log(u"Performing refresh on " + self.show.name)

        self.show.refreshDir()
        self.show.writeMetadata(force=True)
        self.show.populateCache()

        self.inProgress = False


class QueueItemRename(ShowQueueItem):
    def __init__(self, show=None):
        ShowQueueItem.__init__(self, ShowQueueActions.RENAME, show)

    def execute(self):

        ShowQueueItem.execute(self)

        logger.log(u"Performing rename on " + self.show.name)

        try:
            show_loc = self.show.location
        except exceptions.ShowDirNotFoundException:
            logger.log(u"Can't perform rename on " + self.show.name + " when the show dir is missing.", logger.WARNING)
            return

        ep_obj_rename_list = []

        ep_obj_list = self.show.getAllEpisodes(has_location=True)
        for cur_ep_obj in ep_obj_list:
            # Only want to rename if we have a location
            if cur_ep_obj.location:
                if cur_ep_obj.relatedEps:
                    # do we have one of multi-episodes in the rename list already
                    have_already = False
                    for cur_related_ep in cur_ep_obj.relatedEps + [cur_ep_obj]:
                        if cur_related_ep in ep_obj_rename_list:
                            have_already = True
                            break
                    if not have_already:
                        ep_obj_rename_list.append(cur_ep_obj)

                else:
                    ep_obj_rename_list.append(cur_ep_obj)

        for cur_ep_obj in ep_obj_rename_list:
            cur_ep_obj.rename()

        self.inProgress = False


class QueueItemSubtitle(ShowQueueItem):
    def __init__(self, show=None):
        ShowQueueItem.__init__(self, ShowQueueActions.SUBTITLE, show)

    def execute(self):
        ShowQueueItem.execute(self)

        logger.log(u"Downloading subtitles for " + self.show.name)

        self.show.downloadSubtitles()

        self.inProgress = False


class QueueItemUpdate(ShowQueueItem):
    def __init__(self, show=None):
        ShowQueueItem.__init__(self, ShowQueueActions.UPDATE, show)
        self.force = False

    def execute(self):

        ShowQueueItem.execute(self)

        logger.log(u"Beginning update of " + self.show.name)

        logger.log(u"Retrieving show info from " + sickbeard.indexerApi(self.show.indexer).name + "", logger.DEBUG)
        try:
            self.show.loadFromIndexer(cache=not self.force)
        except sickbeard.indexer_error, e:
            logger.log(u"Unable to contact " + sickbeard.indexerApi(self.show.indexer).name + ", aborting: " + ex(e),
                       logger.WARNING)
            return
        except sickbeard.indexer_attributenotfound, e:
            logger.log(u"Data retrieved from " + sickbeard.indexerApi(
                self.show.indexer).name + " was incomplete, aborting: " + ex(e), logger.ERROR)
            return

        logger.log(u"Retrieving show info from IMDb", logger.DEBUG)
        try:
            self.show.loadIMDbInfo()
        except imdb_exceptions.IMDbError, e:
            logger.log(u" Something wrong on IMDb api: " + ex(e), logger.WARNING)
        except Exception, e:
            logger.log(u"Error loading IMDb info: " + ex(e), logger.ERROR)
            logger.log(traceback.format_exc(), logger.DEBUG)

        try:
            self.show.saveToDB()
        except Exception, e:
            logger.log(u"Error saving the episode to the database: " + ex(e), logger.ERROR)
            logger.log(traceback.format_exc(), logger.DEBUG)

        # get episode list from DB
        logger.log(u"Loading all episodes from the database", logger.DEBUG)
        DBEpList = self.show.loadEpisodesFromDB()

        # get episode list from TVDB
        logger.log(u"Loading all episodes from " + sickbeard.indexerApi(self.show.indexer).name + "", logger.DEBUG)
        try:
            IndexerEpList = self.show.loadEpisodesFromIndexer(cache=not self.force)
        except sickbeard.indexer_exception, e:
            logger.log(u"Unable to get info from " + sickbeard.indexerApi(
                self.show.indexer).name + ", the show info will not be refreshed: " + ex(e), logger.ERROR)
            IndexerEpList = None

        if IndexerEpList == None:
            logger.log(u"No data returned from " + sickbeard.indexerApi(
                self.show.indexer).name + ", unable to update this show", logger.ERROR)

        else:

            # for each ep we found on TVDB delete it from the DB list
            for curSeason in IndexerEpList:
                for curEpisode in IndexerEpList[curSeason]:
                    logger.log(u"Removing " + str(curSeason) + "x" + str(curEpisode) + " from the DB list",
                               logger.DEBUG)
                    if curSeason in DBEpList and curEpisode in DBEpList[curSeason]:
                        del DBEpList[curSeason][curEpisode]

            # for the remaining episodes in the DB list just delete them from the DB
            for curSeason in DBEpList:
                for curEpisode in DBEpList[curSeason]:
                    logger.log(u"Permanently deleting episode " + str(curSeason) + "x" + str(
                        curEpisode) + " from the database", logger.MESSAGE)
                    curEp = self.show.getEpisode(curSeason, curEpisode)
                    try:
                        curEp.deleteEpisode()
                    except exceptions.EpisodeDeletedException:
                        pass

        sickbeard.showQueueScheduler.action.refreshShow(self.show, True)  #@UndefinedVariable


class QueueItemForceUpdate(QueueItemUpdate):
    def __init__(self, show=None):
        ShowQueueItem.__init__(self, ShowQueueActions.FORCEUPDATE, show)
        self.force = True