#
# This file is part of SickGear.
#
# SickGear 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.
#
# SickGear 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 SickGear.  If not, see <http://www.gnu.org/licenses/>.

from collections import defaultdict

import datetime
import io
import os
import re
import sys
import threading
import traceback

import sickgear
from exceptions_helper import ex
from json_helper import json_load
from . import db, helpers, logger, name_cache
from .anime import create_anidb_obj
from .classes import OrderedDefaultdict
from .indexers.indexer_config import TVINFO_TVDB
from .sgdatetime import SGDatetime

import lib.rarfile.rarfile as rarfile

from _23 import list_range
from six import iteritems

# noinspection PyUnreachableCode
if False:
    # noinspection PyUnresolvedReferences
    from typing import AnyStr, List, Tuple, Union

exception_dict = {}
anidb_exception_dict = {}
xem_exception_dict = {}
xem_ids_list = defaultdict(list)

exceptionsCache = {}
exceptionsSeasonCache = {}

exceptionLock = threading.Lock()


def should_refresh(name, max_refresh_age_secs=86400, remaining=False):
    # type: (AnyStr, int, bool) -> Union[bool, int]
    """

    :param name: name
    :param max_refresh_age_secs:
    :param remaining: True to return remaining seconds
    :return:
    """
    my_db = db.DBConnection()
    rows = my_db.select('SELECT last_refreshed FROM scene_exceptions_refresh WHERE list = ?', [name])
    if rows:
        last_refresh = int(rows[0]['last_refreshed'])
        if remaining:
            time_left = (last_refresh + max_refresh_age_secs - SGDatetime.timestamp_near())
            return (0, time_left)[time_left > 0]
        return SGDatetime.timestamp_near() > last_refresh + max_refresh_age_secs
    return True


def set_last_refresh(name):
    """

    :param name: name
    :type name: AnyStr
    """
    my_db = db.DBConnection()
    my_db.upsert('scene_exceptions_refresh',
                 {'last_refreshed': SGDatetime.timestamp_near()},
                 {'list': name})


def has_season_exceptions(tvid, prodid, season):
    get_scene_exceptions(tvid, prodid, season=season)
    if (tvid, prodid) in exceptionsCache and -1 < season and season in exceptionsCache[(tvid, prodid)]:
        return True
    return False


def get_scene_exceptions(tvid, prodid, season=-1):
    """
    Given a indexer_id, return a list of all the scene exceptions.
    :param tvid: tvid
    :type tvid: int
    :param prodid: prodid
    :type prodid: int or long
    :param season: season number
    :type season: int
    :return:
    :rtype: List
    """
    global exceptionsCache
    exceptions_list = []

    if (tvid, prodid) not in exceptionsCache or season not in exceptionsCache[(tvid, prodid)]:
        my_db = db.DBConnection()
        exceptions = my_db.select('SELECT show_name'
                                  ' FROM scene_exceptions'
                                  ' WHERE indexer = ? AND indexer_id = ?'
                                  ' AND season = ?',
                                  [tvid, prodid, season])
        if exceptions:
            exceptions_list = list(set([cur_exception['show_name'] for cur_exception in exceptions]))

            if (tvid, prodid) not in exceptionsCache:
                exceptionsCache[(tvid, prodid)] = {}
            exceptionsCache[(tvid, prodid)][season] = exceptions_list
    else:
        exceptions_list = exceptionsCache[(tvid, prodid)][season]

    if 1 == season:  # if we where looking for season 1 we can add generic names
        exceptions_list += get_scene_exceptions(tvid, prodid, season=-1)

    return exceptions_list


def get_all_scene_exceptions(tvid_prodid):
    """

    :param tvid_prodid:
    :type tvid_prodid: AnyStr
    :return:
    :rtype: OrderedDefaultdict
    """
    exceptions_dict = OrderedDefaultdict(list)

    from sickgear.tv import TVidProdid

    my_db = db.DBConnection()
    exceptions = my_db.select('SELECT show_name,season'
                              ' FROM scene_exceptions'
                              ' WHERE indexer = ? AND indexer_id = ?'
                              ' ORDER BY season DESC, show_name DESC',
                              TVidProdid(tvid_prodid).list)

    exceptions_seasons = []
    if exceptions:
        for cur_exception in exceptions:
            # order as, s*, and then season desc, show_name also desc (so years in names may fall newest on top)
            if -1 == cur_exception['season']:
                exceptions_dict[cur_exception['season']].append(cur_exception['show_name'])
            else:
                exceptions_seasons += [cur_exception]

        for cur_exception in exceptions_seasons:
            exceptions_dict[cur_exception['season']].append(cur_exception['show_name'])

    return exceptions_dict


def get_scene_seasons(tvid, prodid):
    """
    return a list of season numbers that have scene exceptions
    :param tvid: tvid
    :type tvid: int
    :param prodid: prodid
    :type prodid: int or long
    :return:
    :rtype: List
    """
    global exceptionsSeasonCache
    exception_season_list = []

    if (tvid, prodid) not in exceptionsSeasonCache:
        my_db = db.DBConnection()
        sql_result = my_db.select('SELECT DISTINCT(season) AS season'
                                  ' FROM scene_exceptions'
                                  ' WHERE indexer = ? AND indexer_id = ?',
                                  [tvid, prodid])
        if sql_result:
            exception_season_list = list(set([int(x['season']) for x in sql_result]))

            if (tvid, prodid) not in exceptionsSeasonCache:
                exceptionsSeasonCache[(tvid, prodid)] = {}

            exceptionsSeasonCache[(tvid, prodid)] = exception_season_list
    else:
        exception_season_list = exceptionsSeasonCache[(tvid, prodid)]

    return exception_season_list


def get_scene_exception_by_name(show_name):
    """

    :param show_name: show name
    :type show_name: AnyStr
    :return:
    :rtype: Tuple[None, None, None] or Tuple[int, int or long, int]
    """
    return get_scene_exception_by_name_multiple(show_name)[0]


def get_scene_exception_by_name_multiple(show_name):
    """

    :param show_name: show name
    :type show_name: AnyStr
    :return:  (tvid, prodid, season) of the exception, None if no exception is present.
    :rtype: Tuple[None, None, None] or Tuple[int, int or long, int]
    """
    try:
        exception_result = name_cache.sceneNameCache[helpers.full_sanitize_scene_name(show_name)]
        return [exception_result]
    except (BaseException, Exception):
        return [[None, None, None]]


def retrieve_exceptions():
    """
    Looks up the exceptions on github, parses them into a dict, and inserts them into the
    scene_exceptions table in cache.db. Also clears the scene name cache.
    """
    global exception_dict, anidb_exception_dict, xem_exception_dict

    # exceptions are stored on GitHub pages
    for tvid in sickgear.TVInfoAPI().sources:
        if should_refresh(sickgear.TVInfoAPI(tvid).name):
            logger.log(f'Checking for scene exception updates for {sickgear.TVInfoAPI(tvid).name}')

            url = sickgear.TVInfoAPI(tvid).config.get('scene_url')
            if not url:
                continue

            url_data = helpers.get_url(url)
            if None is url_data:
                # When None is urlData, trouble connecting to github
                logger.error(f'Check scene exceptions update failed. Unable to get URL: {url}')
                continue

            else:
                set_last_refresh(sickgear.TVInfoAPI(tvid).name)

                # each exception is on one line with the format indexer_id: 'show name 1', 'show name 2', etc
                for cur_line in url_data.splitlines():
                    cur_line = cur_line
                    prodid, sep, aliases = cur_line.partition(':')

                    if not aliases:
                        continue

                    prodid = int(prodid)

                    # regex out the list of shows, taking \' into account
                    # alias_list = [re.sub(r'\\(.)', r'\1', x) for x in re.findall(r"'(.*?)(?<!\\)',?", aliases)]
                    alias_list = [{re.sub(r'\\(.)', r'\1', x): -1} for x in re.findall(r"'(.*?)(?<!\\)',?", aliases)]
                    exception_dict[(tvid, prodid)] = alias_list
                    del alias_list
                del url_data

    # XEM scene exceptions
    _xem_exceptions_fetcher()
    for xem_ex in xem_exception_dict:
        if xem_ex in exception_dict:
            exception_dict[xem_ex] = exception_dict[xem_ex] + xem_exception_dict[xem_ex]
        else:
            exception_dict[xem_ex] = xem_exception_dict[xem_ex]

    # AniDB scene exceptions
    _anidb_exceptions_fetcher()
    for anidb_ex in anidb_exception_dict:
        if anidb_ex in exception_dict:
            exception_dict[anidb_ex] = exception_dict[anidb_ex] + anidb_exception_dict[anidb_ex]
        else:
            exception_dict[anidb_ex] = anidb_exception_dict[anidb_ex]

    # Custom exceptions
    custom_exception_dict, cnt_updated_numbers, min_remain_iv = _custom_exceptions_fetcher()
    for custom_ex in custom_exception_dict:
        if custom_ex in exception_dict:
            exception_dict[custom_ex] = exception_dict[custom_ex] + custom_exception_dict[custom_ex]
        else:
            exception_dict[custom_ex] = custom_exception_dict[custom_ex]

    changed_exceptions = False

    # write all the exceptions we got off the net into the database
    my_db = db.DBConnection()
    cl = []
    for cur_tvid_prodid in exception_dict:

        # get a list of the existing exceptions for this ID
        existing_exceptions = [{x['show_name']: x['season']} for x in
                               my_db.select('SELECT show_name, season'
                                            ' FROM scene_exceptions'
                                            ' WHERE indexer = ? AND indexer_id = ?',
                                            list(cur_tvid_prodid))]

        # if this exception isn't already in the DB then add it
        for cur_exception_dict in filter(lambda e: e not in existing_exceptions, exception_dict[cur_tvid_prodid]):
            try:
                cur_exception, cur_season = next(iteritems(cur_exception_dict))
            except (BaseException, Exception):
                logger.error('scene exception error')
                logger.error(traceback.format_exc())
                continue

            cl.append(['INSERT INTO scene_exceptions'
                       ' (indexer, indexer_id, show_name, season) VALUES (?,?,?,?)',
                       list(cur_tvid_prodid) + [cur_exception, cur_season]])
            changed_exceptions = True

    if cl:
        my_db.mass_action(cl)
        name_cache.build_name_cache(update_only_scene=True)

    # since this could invalidate the results of the cache we clear it out after updating
    if changed_exceptions:
        logger.log('Updated scene exceptions')
    else:
        logger.log('No scene exceptions update needed')

    # cleanup
    exception_dict.clear()
    anidb_exception_dict.clear()
    xem_exception_dict.clear()

    return changed_exceptions, cnt_updated_numbers, min_remain_iv


def update_scene_exceptions(tvid, prodid, scene_exceptions):
    """
    Given a indexer_id, and a list of all show scene exceptions, update the db.
    :param tvid: tvid
    :type tvid: int
    :param prodid: prodid
    :type prodid: int or long
    :param scene_exceptions:
    :type scene_exceptions: List
    """
    global exceptionsCache
    my_db = db.DBConnection()
    my_db.action('DELETE FROM scene_exceptions'
                 ' WHERE indexer = ? AND indexer_id = ?',
                 [tvid, prodid])

    # A change has been made to the scene exception list. Let's clear the cache, to make this visible
    exceptionsCache[(tvid, prodid)] = defaultdict(list)

    logger.log('Updating scene exceptions', logger.MESSAGE)
    for exception in scene_exceptions:
        cur_season, cur_exception = exception.split('|', 1)
        try:
            cur_season = int(cur_season)
        except (BaseException, Exception):
            logger.error('invalid scene exception: %s - %s:%s' % ('%s:%s' % (tvid, prodid), cur_season, cur_exception))
            continue

        exceptionsCache[(tvid, prodid)][cur_season].append(cur_exception)

        my_db.action('INSERT INTO scene_exceptions'
                     ' (indexer, indexer_id, show_name, season) VALUES (?,?,?,?)',
                     [tvid, prodid, cur_exception, cur_season])

    sickgear.name_cache.build_name_cache(update_only_scene=True)


def _custom_exceptions_fetcher():
    custom_exception_dict = {}
    cnt_updated_numbers = 0

    src_id = 'GHSG'
    logger.log(f'Checking to update custom alternatives from {src_id}')

    dirpath = os.path.join(sickgear.CACHE_DIR, 'alts')
    tmppath = os.path.join(dirpath, 'tmp')
    file_rar = os.path.join(tmppath, 'alt.rar')
    file_cache = os.path.join(dirpath, 'alt.json')
    iv = 30 * 60  # min interval to fetch updates
    refresh = should_refresh(src_id, iv)
    fetch_data = not os.path.isfile(file_cache) or (not int(os.environ.get('NO_ALT_GET', 0)) and refresh)
    if fetch_data:
        if os.path.exists(tmppath):
            helpers.remove_file(tmppath, tree=True)
        helpers.make_path(tmppath)
        helpers.download_file(r'https://github.com/SickGear/sickgear.altdata/raw/main/alt.rar', file_rar)

        rar_handle = None
        if 'win32' == sys.platform:
            rarfile.UNRAR_TOOL = os.path.join(sickgear.PROG_DIR, 'lib', 'rarfile', 'UnRAR.exe')
        try:
            rar_handle = rarfile.RarFile(file_rar)
            rar_handle.extractall(path=dirpath, pwd='sickgear_alt')
        except(BaseException, Exception) as e:
            logger.error(f'Failed to unpack archive: {file_rar} with error: {ex(e)}')

        if rar_handle:
            rar_handle.close()
            del rar_handle

        helpers.remove_file(tmppath, tree=True)

    if refresh:
        set_last_refresh(src_id)

    if not fetch_data and not os.path.isfile(file_cache):
        logger.debug(f'Unable to fetch custom exceptions, skipped: {file_rar}')
        return custom_exception_dict, cnt_updated_numbers, should_refresh(src_id, iv, remaining=True)

    data = {}
    try:
        with io.open(file_cache) as fh:
            data = json_load(fh)
    except(BaseException, Exception) as e:
        logger.error(f'Failed to unpack json data: {file_rar} with error: {ex(e)}')

    # handle data
    from .scene_numbering import find_scene_numbering, set_scene_numbering_helper
    from .tv import TVidProdid

    for tvid_prodid, season_data in iteritems(data):
        show_obj = sickgear.helpers.find_show_by_id(tvid_prodid, no_mapped_ids=True)
        if not show_obj:
            continue

        used = set()
        for for_season, data in iteritems(season_data):
            for_season = helpers.try_int(for_season, None)
            tvid, prodid = TVidProdid(tvid_prodid).tuple
            if data.get('n'):  # alt names
                custom_exception_dict.setdefault((tvid, prodid), [])
                custom_exception_dict[(tvid, prodid)] += [{name: for_season} for name in data.get('n')]

            for update in data.get('se') or []:
                for for_episode, se_range in iteritems(update):  # scene episode alt numbers
                    for_episode = helpers.try_int(for_episode, None)

                    target_season, episode_range = se_range.split('x')
                    scene_episodes = [int(x) for x in episode_range.split('-') if None is not helpers.try_int(x, None)]

                    if 2 == len(scene_episodes):
                        desc = scene_episodes[0] > scene_episodes[1]
                        if desc:  # handle a descending range case
                            scene_episodes.reverse()
                        scene_episodes = list_range(*[scene_episodes[0], scene_episodes[1] + 1])
                        if desc:
                            scene_episodes.reverse()

                    target_season = helpers.try_int(target_season, None)
                    for target_episode in scene_episodes:
                        sn = find_scene_numbering(tvid, prodid, for_season, for_episode)
                        used.add((for_season, for_episode, target_season, target_episode))
                        if sn and ((for_season, for_episode) + sn) not in used \
                                and (for_season, for_episode) not in used:
                            logger.debug(f'Skipped setting "{show_obj.unique_name}" episode {for_season}x{for_episode}'
                                         f' to target a release {target_season}x{target_episode}'
                                         f' because set to {sn[0]}x{sn[1]}')
                        else:
                            used.add((for_season, for_episode))
                            if not sn or sn != (target_season, target_episode):  # not already set
                                result = set_scene_numbering_helper(
                                    tvid, prodid, for_season=for_season, for_episode=for_episode,
                                    scene_season=target_season, scene_episode=target_episode)
                                if result.get('success'):
                                    cnt_updated_numbers += 1

                        for_episode = for_episode + 1

    return custom_exception_dict, cnt_updated_numbers, should_refresh(src_id, iv, remaining=True)


def _anidb_exceptions_fetcher():
    global anidb_exception_dict

    if should_refresh('anidb'):
        logger.log('Checking for AniDB scene exception updates')
        for cur_show_obj in filter(lambda _s: _s.is_anime and TVINFO_TVDB == _s.tvid, sickgear.showList):
            try:
                anime = create_anidb_obj(name=cur_show_obj.name, tvdbid=cur_show_obj.prodid, autoCorrectName=True)
            except (BaseException, Exception):
                continue
            if anime.name and anime.name != cur_show_obj.name:
                anidb_exception_dict[(cur_show_obj.tvid, cur_show_obj.prodid)] = [{anime.name: -1}]

        set_last_refresh('anidb')
    return anidb_exception_dict


def _xem_exceptions_fetcher():
    global xem_exception_dict

    xem_list = 'xem_us'
    for cur_show_obj in sickgear.showList:
        if cur_show_obj.is_anime and not cur_show_obj.paused:
            xem_list = 'xem'
            break

    if should_refresh(xem_list):
        for tvid in [i for i in sickgear.TVInfoAPI().sources if 'xem_origin' in sickgear.TVInfoAPI(i).config]:
            logger.log(f'Checking for XEM scene exception updates for {sickgear.TVInfoAPI(tvid).name}')

            url = 'https://thexem.info/map/allNames?origin=%s%s&seasonNumbers=1'\
                  % (sickgear.TVInfoAPI(tvid).config['xem_origin'], ('&language=us', '')['xem' == xem_list])

            parsed_json = helpers.get_url(url, parse_json=True, timeout=90)
            if not parsed_json:
                logger.error(f'Check scene exceptions update failed for {sickgear.TVInfoAPI(tvid).name},'
                             f' Unable to get URL: {url}')
                continue

            if 'failure' == parsed_json['result']:
                continue

            for prodid, names in iteritems(parsed_json['data']):
                try:
                    xem_exception_dict[(tvid, int(prodid))] = names
                except (BaseException, Exception):
                    continue

        set_last_refresh(xem_list)

    return xem_exception_dict


def _xem_get_ids(infosrc_name, xem_origin):
    """

    :param infosrc_name:
    :type infosrc_name: AnyStr
    :param xem_origin:
    :type xem_origin: AnyStr
    :return:
    :rtype: List
    """
    xem_ids = []

    url = 'https://thexem.info/map/havemap?origin=%s' % xem_origin

    task = 'Fetching show ids with%s xem scene mapping%s for origin'
    logger.log(f'{task % ("", "s")} {infosrc_name}')
    parsed_json = helpers.get_url(url, parse_json=True, timeout=90)
    if not isinstance(parsed_json, dict) or not parsed_json:
        logger.error(f'Failed {task.lower() % ("", "s")} {infosrc_name},'
                     f' Unable to get URL: {url}')
    else:
        if 'success' == parsed_json.get('result', '') and 'data' in parsed_json:
            xem_ids = list(set(filter(lambda prodid: 0 < prodid,
                                      map(lambda pid: helpers.try_int(pid), parsed_json['data']))))
            if 0 == len(xem_ids):
                logger.warning(f'Failed {task.lower() % ("", "s")} {infosrc_name},'
                               f' no data items parsed from URL: {url}')

    logger.log(f'Finished {task.lower() % (f" {len(xem_ids)}", helpers.maybe_plural(xem_ids))} {infosrc_name}')
    return xem_ids


def get_xem_ids():
    global xem_ids_list

    for tvid, name in iteritems(sickgear.TVInfoAPI().xem_supported_sources):
        xem_ids = _xem_get_ids(name, sickgear.TVInfoAPI(tvid).config['xem_origin'])
        if len(xem_ids):
            xem_ids_list[tvid] = xem_ids


def has_abs_episodes(ep_obj=None, name=None):
    """

    :param ep_obj: episode object
    :type ep_obj: sickgear.tv.TVEpisode or None
    :param name: name
    :type name: AnyStr
    :return:
    :rtype: bool
    """
    return any((name or ep_obj.show_obj.name or '').lower().startswith(x.lower()) for x in [
        'The Eighties', 'The Making of the Mob', 'The Night Of', 'Roots 2016', 'Trepalium'
    ])