# Author: Tyler Fenby <tylerfenby@gmail.com>
#
# 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 sqlite3 import Cursor
import datetime
import re

from . import db, logger
from .common import FAILED, WANTED, Quality, statusStrings
from .history import dateFormat
from exceptions_helper import EpisodeNotFoundException, ex

from _23 import unquote
from six import PY2, text_type

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


def db_cmd(sql, params, select=True):
    # type: (AnyStr, List, bool) -> Union[List, Optional[Cursor]]
    """

    :param sql: sql string
    :param params: list of parameters
    :param select: use selcet
    :return: sql result
    """
    my_db = db.DBConnection('failed.db')
    sql_result = select and my_db.select(sql, params) or my_db.action(sql, params)
    return sql_result


def db_select(sql, params):
    # type: (AnyStr, List) -> List
    """

    :param sql: sql string
    :param params: list of parameters
    :return: sql result
    """
    return db_cmd(sql, params)


def db_action(sql, params=None):
    # type: (AnyStr, Optional[List]) -> Optional[Cursor]
    """

    :param sql: sql string
    :param params: list of parameters
    :return: sql result
    """
    return db_cmd(sql, params, False)


def prepare_failed_name(release):
    """Standardizes release name for failed DB
    :param release: release name
    :type release: AnyStr
    :return: standardized release name
    :rtype: AnyStr
    """

    fixed = unquote(release)
    if fixed.endswith('.nzb'):
        fixed = fixed.rpartition('.')[0]

    fixed = re.sub(r'[.\-+ ]', '_', fixed)

    # noinspection PyUnresolvedReferences
    if PY2 and not isinstance(fixed, unicode):
        fixed = text_type(fixed, 'utf-8', 'replace')

    return fixed


def add_failed(release):
    """

    :param release: release name
    :type release: AnyStr
    """
    size = -1
    provider = ''

    release = prepare_failed_name(release)

    sql_result = db_select('SELECT * FROM history t WHERE t.release=?', [release])

    if not any(sql_result):
        logger.log('Release not found in failed.db snatch history', logger.WARNING)

    elif 1 < len(sql_result):
        logger.log('Multiple logged snatches found for release in failed.db', logger.WARNING)
        sizes = len(set([x['size'] for x in sql_result]))
        providers = len(set([x['provider'] for x in sql_result]))

        if 1 == sizes:
            logger.log('However, they\'re all the same size. Continuing with found size', logger.WARNING)
            size = sql_result[0]['size']

        else:
            logger.log(
                'They also vary in size. Deleting logged snatches and recording this release with no size/provider',
                logger.WARNING)
            for cur_result in sql_result:
                remove_snatched(cur_result['release'], cur_result['size'], cur_result['provider'])

        if 1 == providers:
            logger.log('They\'re also from the same provider. Using it as well')
            provider = sql_result[0]['provider']
    else:
        size = sql_result[0]['size']
        provider = sql_result[0]['provider']

    if not has_failed(release, size, provider):
        db_action('INSERT INTO failed (`release`, `size`, `provider`) VALUES (?, ?, ?)', [release, size, provider])

    remove_snatched(release, size, provider)


def add_snatched(search_result):
    """
    :param search_result: SearchResult object
    :type search_result: sickgear.classes.SearchResult
    """

    log_date = datetime.datetime.now().strftime(dateFormat)

    provider = 'unknown'
    if None is not search_result.provider:
        provider = search_result.provider.name

    for ep_obj in search_result.ep_obj_list:
        db_action(
            'INSERT INTO history (`date`, `size`, `release`, `provider`, `showid`, `season`, `episode`, `old_status`, '
            '`indexer`) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
            [log_date, search_result.size, prepare_failed_name(search_result.name), provider,
             search_result.ep_obj_list[0].show_obj.prodid, ep_obj.season, ep_obj.episode, ep_obj.status,
             search_result.ep_obj_list[0].show_obj.tvid])


def set_episode_failed(ep_obj):
    """
    set episode object to failed

    :param ep_obj: episode object
    :type ep_obj: sickgear.tv.TVEpisode
    """
    try:
        with ep_obj.lock:
            quality = Quality.splitCompositeStatus(ep_obj.status)[1]
            ep_obj.status = Quality.compositeStatus(FAILED, quality)
            ep_obj.save_to_db()

    except EpisodeNotFoundException as e:
        logger.log('Unable to get episode, please set its status manually: %s' % ex(e), logger.WARNING)


def remove_failed(release):
    """

    :param release: release name
    :type release: AnyStr
    """
    db_action('DELETE FROM history WHERE %s=?' % '`release`', [prepare_failed_name(release)])


def remove_snatched(release, size, provider):
    """

    :param release: release name
    :type release: AnyStr
    :param size: release size
    :type size: int or long
    :param provider: provider name
    :type provider: AnyStr
    """
    db_action('DELETE FROM history WHERE %s=? AND %s=? AND %s=?' % ('`release`', '`size`', '`provider`'),
              [prepare_failed_name(release), size, provider])


def has_failed(release, size, provider='%'):
    """
    Returns True if a release has previously failed.

    If provider is given, return True only if the release is found
    with that specific provider. Otherwise, return True if the release
    is found with any provider.

    :param release: release name
    :type release: AnyStr
    :param size: size of release
    :type size: int or long
    :param provider: provider name
    :type provider: AnyStr
    :return: has failed
    :rtype: bool
    """
    return any(db_select('SELECT * FROM failed t WHERE t.release=? AND t.size=? AND t.provider LIKE ?',
                         [prepare_failed_name(release), size, provider]))


def revert_episode(ep_obj):
    """
    Restore the episodes of a failed download to their original state

    :param ep_obj: episode object
    :type ep_obj: sickgear.tv.TVEpisode
    """
    sql_result = db_select(
        'SELECT * FROM history t WHERE t.indexer=? AND t.showid=? AND t.season=?',
        [ep_obj.show_obj.tvid, ep_obj.show_obj.prodid, ep_obj.season])

    history_eps = {r['episode']: r for r in sql_result}

    try:
        logger.log('Reverting episode %sx%s: [%s]' % (ep_obj.season, ep_obj.episode, ep_obj.name))
        with ep_obj.lock:
            if ep_obj.episode in history_eps:
                status_revert = history_eps[ep_obj.episode]['old_status']

                status, quality = Quality.splitCompositeStatus(status_revert)
                logger.log('Found in failed.db history with status: %s quality: %s' % (
                    statusStrings[status], Quality.qualityStrings[quality]))
            else:
                status_revert = WANTED

                logger.log('Episode not found in failed.db history. Setting it to WANTED', logger.WARNING)

            ep_obj.status = status_revert
            ep_obj.save_to_db()

    except EpisodeNotFoundException as e:
        logger.log('Unable to create episode, please set its status manually: %s' % ex(e), logger.WARNING)


def find_old_status(ep_obj):
    """
    :param ep_obj: episode object
    :type ep_obj: sickgear.tv.TVEpisode
    :return: Old status if failed history item found
    :rtype: None or int
    """
    # Search for release in snatch history
    results = db_select(
        'SELECT t.old_status FROM history t WHERE t.indexer=? AND t.showid=? AND t.season=? AND t.episode=? '
        + 'ORDER BY t.date DESC LIMIT 1', [ep_obj.show_obj.tvid, ep_obj.show_obj.prodid, ep_obj.season, ep_obj.episode])
    if any(results):
        return results[0]['old_status']


def find_release(ep_obj):
    """
    Find releases in history by show ID and season.
    Return None for release if multiple found or no release found.
    :param ep_obj: episode object
    :type ep_obj: sickgear.tv.TVEpisode
    :return:
    :rtype: Tuple[AnyStr, AnyStr] or Tuple[AnyStr, AnyStr]
    """
    # Clear old snatches for this release if any exist
    from_where = ' FROM history WHERE indexer=%s AND showid=%s AND season=%s AND episode=%s' % \
                 (ep_obj.show_obj.tvid, ep_obj.show_obj.prodid, ep_obj.season, ep_obj.episode)
    db_action('DELETE %s AND date < (SELECT max(date) %s)' % (from_where, from_where))

    # Search for release in snatch history
    results = db_select(
        'SELECT t.release, t.provider, t.date FROM history t WHERE t.indexer=? AND t.showid=? AND t.season=? '
        'AND t.episode=?', [ep_obj.show_obj.tvid, ep_obj.show_obj.prodid, ep_obj.season, ep_obj.episode])

    if any(results):
        r = results[0]
        release = r['release']
        provider = r['provider']

        # Clear any incomplete snatch records for this release if any exist
        db_action('DELETE FROM history WHERE %s=? AND %s!=?' % ('`release`', '`date`'), [release, r['date']])

        # Found a previously failed release
        logger.log('Found failed.db history release %sx%s: [%s]' % (
            ep_obj.season, ep_obj.episode, release), logger.DEBUG)
    else:
        release = None
        provider = None

        # Release not found
        logger.debug('No found failed.db history release for %sx%s: [%s]' % (
            ep_obj.season, ep_obj.episode, ep_obj.show_obj.unique_name))

    return release, provider