#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2019-2024 A S Lewis
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# This program 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.


"""Tidy operation classes."""


# Import Gtk modules
import gi
from gi.repository import GObject


# Import other modules
try:
    import moviepy.editor
except:
    pass

import os
import re
import shutil
import threading
import time


# Import our modules
import formats
import media
import utils
# Use same gettext translations
from mainapp import _


# Classes


class TidyManager(threading.Thread):

    """Called by mainapp.TartubeApp.tidy_manager_start().

    Python class to manage the tidy operation, in which videos can be checked
    for corruption and actually existing (or not), and various file types can
    be deleted collectively.

    Args:

        app_obj (mainapp.TartubeApp): The main application

        choices_dict (dict): A dictionary specifying the choices made by the
            user in mainwin.TidyDialogue. The dictionary is in the following
            format:

            media_data_obj: A media.Channel, media.Playlist or media.Folder
                object, or None if all channels/playlists/folders are to be
                tidied up. If specified, the cahnnel/playlist/folder and all of
                its descendants are checked

            corrupt_flag: True if video files should be checked for corruption

            del_corrupt_flag: True if corrupted video files should be deleted

            exist_Flag: True if video files that should exist should be
                checked, in case they don't (and vice-versa)

            del_video_flag: True if downloaded video files should be deleted

            del_others_flag: True if all video/audio files with the same name
                should be deleted (as artefacts of post-processing with FFmpeg
                or AVConv)

            remove_no_url_flag: True if any media.Video objects whose URL is
                not set should be removed from the database (no files are
                deleted)

            remove_duplicate_flag: True if any media.Video objects, which are
                not marked as downloaded and which share a URL with another
                media.Video object with the same parent and which is marked as
                downloaded, should be removed from the database (no files are
                deleted)

            del_archive_flag: True if all youtube-dl archive files should be
                deleted

            move_thumb_flag: True if all thumbnail files should be moved into a
                subdirectory

            del_thumb_flag: True if all thumbnail files should be deleted

            del_webp_flag: True if all .webp thumbnail files should be deleted

            convert_webp_flag: True if all .webp thumbnail files should be
                converted to .jpg

            move_data_flag: True if description, metadata (JSON) and annotation
                files should be moved into a subdirectory

            del_descrip_flag: True if all description files should be deleted

            del_json_flag: True if all metadata (JSON) files should be deleted

            del_xml_flag: True if all annotation files should be deleted

            convert_ext_flag: True if .unknown_video file extensions should be
                converted to .mp4 (experimental; see Git #472)

    """


    # Standard class methods


    def __init__(self, app_obj, choices_dict):

        super(TidyManager, self).__init__()

        # IV list - class objects
        # -----------------------
        # The mainapp.TartubeApp object
        self.app_obj = app_obj
        # The media data object (channel, playlist or folder) to be tidied up,
        #   or None if the whole data directory is to be tidied up
        # If specified, the channel/playlist/folder and all of its descendants
        #   are checked
        self.init_obj = choices_dict['media_data_obj']


        # IV list - other
        # ---------------
        # Flag set to False if self.stop_tidy_operation() is called, which
        #   halts the operation immediately
        self.running_flag = True

        # The time at which the tidy operation began (in seconds since epoch)
        self.start_time = int(time.time())
        # The time at which the tidy operation completed (in seconds since
        #   epoch)
        self.stop_time = None
        # The time (in seconds) between iterations of the loop in self.run()
        self.sleep_time = 0.25

        # Flags specifying which actions should be applied
        # True if video files should be checked for corruption
        self.corrupt_flag = choices_dict['corrupt_flag']
        # True if corrupted video files should be deleted
        self.del_corrupt_flag = choices_dict['del_corrupt_flag']
        # True if video files that should exist should be checked, in case they
        #   don't (and vice-versa)
        self.exist_flag = choices_dict['exist_flag']
        # True if downloaded video files should be deleted
        self.del_video_flag = choices_dict['del_video_flag']
        # True if all video/audio files with the same name should be deleted
        #   (as artefacts of post-processing with FFmpeg or AVConv)
        self.del_others_flag = choices_dict['del_others_flag']
        # True if any media.Video objects whose URL is not set should be
        #   removed from the database (no files are deleted)
        self.remove_no_url_flag = choices_dict['remove_no_url_flag']
        # True if any media.Video objects, which are not marked as downloaded
        #   and which share a URL with another media.Video object with the same
        #   parent and which is marked as downloaded, should be removed from
        #   the database (no files are deleted)
        self.remove_duplicate_flag = choices_dict['remove_duplicate_flag']
        # True if all youtube-dl archive files should be deleted
        self.del_archive_flag = choices_dict['del_archive_flag']
        # True if all thumbnail files should be moved into a subdirectory
        self.move_thumb_flag = choices_dict['move_thumb_flag']
        # True if all thumbnail files should be deleted
        self.del_thumb_flag = choices_dict['del_thumb_flag']
        # True if all .webp thumbnail files should be deleted
        self.del_webp_flag = choices_dict['del_webp_flag']
        # True if all .webp thumbnail files should be converted to .jpg.
        #   Requires mainapp.TartubeApp.ffmpeg_fail_flag set to False
        self.convert_webp_flag = choices_dict['convert_webp_flag']
        # True if description, metadata (JSON) and annotation files should be
        #   moved into a subdirectory
        self.move_data_flag = choices_dict['move_data_flag']
        # True if all description files should be deleted
        self.del_descrip_flag = choices_dict['del_descrip_flag']
        # True if all metadata (JSON) files should be deleted
        self.del_json_flag = choices_dict['del_json_flag']
        # True if all annotation files should be deleted
        self.del_xml_flag = choices_dict['del_xml_flag']
        # True if .unknown_video file extensions should be converted to .mp4
        #   (experimental; see Git #472)
        self.convert_ext_flag = choices_dict['convert_ext_flag']

        # The number of media data objects whose directories have been tidied
        #   so far...
        self.job_count = 0
        # ...and the total number to tidy (these numbers are displayed in the
        #   progress bar in the Videos tab)
        self.job_total = 0

        # Individual counts, updated as we go
        self.video_corrupt_count = 0
        self.video_corrupt_deleted_count = 0
        self.video_exist_count = 0
        self.video_no_exist_count = 0
        self.video_deleted_count = 0
        self.other_deleted_count = 0
        self.remove_no_url_count = 0
        self.remove_duplicate_count = 0
        self.archive_deleted_count = 0
        self.thumb_moved_count = 0
        self.thumb_deleted_count = 0
        self.webp_deleted_count = 0
        self.webp_converted_count = 0
        self.data_moved_count = 0
        self.descrip_deleted_count = 0
        self.json_deleted_count = 0
        self.xml_deleted_count = 0
        self.ext_converted_count = 0


        # Code
        # ----

        # Do not convert .webp thumbnails, if not allowed
        if self.app_obj.ffmpeg_fail_flag:
            self.convert_webp_flag = False

        # Let's get this party started!
        self.start()


    # Public class methods


    def run(self):

        """Called as a result of self.__init__().

        Compiles a list of media data objects (channels, playlists and folders)
        to tidy up. If self.init_obj is not set, only that channel/playlist/
        folder (and its child channels/playlists/folders) are tidied up;
        otherwise the whole data directory is tidied up.

        Then calls self.tidy_directory() for each item in the list.

        Finally informs the main application that the tidy operation is
        complete.
        """

        # Show information about the tidy operation in the Output tab
        if not self.init_obj:
            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                _('Starting tidy operation, tidying up whole data directory'),
            )

        else:

            media_type = self.init_obj.get_type()

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                _('Starting tidy operation, tidying up \'{0}\'').format(
                    self.init_obj.name,
                )
            )

        if self.corrupt_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Check videos are not corrupted:') + ' ' + text,
        )

        if self.corrupt_flag:

            if self.del_corrupt_flag:
                text = _('YES')
            else:
                text = _('NO')

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Delete corrupted videos:') + ' ' + text,
            )

        if self.exist_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Check videos do/don\'t exist:') + ' ' + text,
        )

        if self.del_video_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete all video files:') + ' ' + text,
        )

        if self.del_video_flag:

            if self.del_others_flag:
                text = _('YES')
            else:
                text = _('NO')

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Delete other video/audio files:') + ' ' + text,
            )

        if self.remove_no_url_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Remove no_URL videos from database:') + ' ' + text,
        )

        if self.remove_duplicate_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Remove undownloaded duplicate videos from database:') \
            + ' ' + text,
        )

        if self.del_archive_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete downloader archive files:') + ' ' + text,
        )

        if self.move_thumb_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Move thumbnails into own folder:') + ' ' + text,
        )

        if self.del_thumb_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete all thumbnail files:') + ' ' + text,
        )

        if self.del_webp_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete all .webp thumbnail files:') + ' ' + text,
        )

        if self.convert_webp_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Convert .webp thumbnails to .jpg:') + ' ' + text,
        )

        if self.move_data_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Move other metadata files into own folder:') \
            + ' ' + text,
        )

        if self.del_descrip_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete all description files:') + ' ' + text,
        )

        if self.del_json_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete all metadata (JSON) files:') + ' ' + text,
        )

        if self.del_xml_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Delete all annotation files:') + ' ' + text,
        )

        if self.convert_ext_flag:
            text = _('YES')
        else:
            text = _('NO')

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            '   ' + _('Convert .unknown_video file extensions to .mp4:') \
            + ' ' + text,
        )

        # Compile a list of channels, playlists and folders to tidy up (each
        #   one has their own sub-directory inside Tartube's data directory)
        obj_list = []
        if self.init_obj:
            # Add this channel/playlist/folder, and any child channels/
            #   playlists/folders (but not videos, obviously)
            obj_list = self.init_obj.compile_all_containers(obj_list)

        else:
            # Add all channels/playlists/folders in the database
            for dbid in self.app_obj.container_reg_dict.keys():

                obj = self.app_obj.media_reg_dict[dbid]
                # Don't add private folders
                if not isinstance(obj, media.Folder) or not obj.priv_flag:
                    obj_list.append(obj)

        self.job_total = len(obj_list)

        # Check each sub-directory in turn, updating the media data registry
        #   as we go
        while self.running_flag and obj_list:
            self.tidy_directory(obj_list.pop(0))

            # Pause a moment, before the next iteration of the loop (don't want
            #   to hog resources)
            time.sleep(self.sleep_time)

        # Operation complete. Set the stop time
        self.stop_time = int(time.time())

        # Show a confirmation in the Output tab
        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            _('Tidy operation finished'),
        )

        if self.corrupt_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Corrupted videos found:') + ' ' \
                + str(self.video_corrupt_count),
            )

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Corrupted videos deleted:') + ' ' \
                + str(self.video_corrupt_deleted_count),
            )

        if self.exist_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('New video files detected:') + ' ' \
                + str(self.video_exist_count),
            )

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Missing video files detected:') + ' ' \
                + str(self.video_no_exist_count),
            )

        if self.del_video_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Non-corrupted video files deleted:') + ' ' \
                + str(self.video_deleted_count),
            )

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Other video/audio files deleted:') + ' ' \
                + str(self.other_deleted_count),
            )

        if self.remove_no_url_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('No-URL videos removed from database:') + ' ' \
                + str(self.remove_no_url_count),
            )

        if self.remove_duplicate_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' \
                + _('Undownloaded duplicate videos removed from database:') \
                + ' ' + str(self.remove_duplicate_count),
            )

        if self.del_archive_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Downloader archive files deleted:') + ' ' \
                + str(self.archive_deleted_count),
            )

        if self.move_thumb_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Thumbnail files moved:') + ' ' \
                + str(self.thumb_moved_count),
            )

        if self.del_thumb_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Thumbnail files deleted:') + ' ' \
                + str(self.thumb_deleted_count),
            )

        if self.del_webp_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('.webp thumbnail files deleted:') + ' ' \
                + str(self.webp_deleted_count),
            )

        if self.convert_webp_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('.webp thumbnails converted to .jpg:') + ' ' \
                + str(self.webp_converted_count),
            )

        if self.move_data_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Other metadata files moved:') + ' ' \
                + str(self.data_moved_count),
            )

        if self.del_descrip_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Description files deleted:') + ' ' \
                + str(self.descrip_deleted_count),
            )

        if self.del_json_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Metadata (JSON) files deleted:') + ' ' \
                + str(self.json_deleted_count),
            )

        if self.del_xml_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Annotation files deleted:') + ' ' \
                + str(self.xml_deleted_count),
            )

        if self.convert_ext_flag:

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('File extensions converted:') + ' ' \
                + str(self.ext_converted_count),
            )

        # Let the timer run for a few more seconds to prevent Gtk errors
        GObject.timeout_add(
            0,
            self.app_obj.tidy_manager_halt_timer,
        )


    def tidy_directory(self, media_data_obj):

        """Called by self.run().

        Tidy up the directory of a single channel, playlist or folder.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        # Update the main window's progress bar
        self.job_count += 1
        GObject.timeout_add(
            0,
            self.app_obj.main_win_obj.update_progress_bar,
            media_data_obj.name,
            self.job_count,
            self.job_total,
        )

        media_type = media_data_obj.get_type()

        self.app_obj.main_win_obj.output_tab_write_stdout(
            1,
            _('Checking:') + ' \'' + media_data_obj.name + '\'',
        )

        if self.convert_ext_flag:
            self.convert_file_ext(media_data_obj)

        if self.corrupt_flag:
            self.check_video_corrupt(media_data_obj)

        if self.exist_flag:
            self.check_videos_exist(media_data_obj)

        if self.del_video_flag:
            self.delete_video(media_data_obj)

        if self.remove_no_url_flag:
            self.remove_no_url(media_data_obj)

        if self.remove_duplicate_flag:
            self.remove_duplicate(media_data_obj)

        if self.del_archive_flag:
            self.delete_archive(media_data_obj)

        if self.move_thumb_flag:
            self.move_thumb(media_data_obj)

        if self.del_thumb_flag:
            self.delete_thumb(media_data_obj)

        if self.del_webp_flag:
            self.delete_webp(media_data_obj)

        if self.convert_webp_flag:
            self.convert_webp(media_data_obj)

        if self.move_data_flag:
            self.move_data(media_data_obj)

        if self.del_descrip_flag:
            self.delete_descrip(media_data_obj)

        if self.del_json_flag:
            self.delete_json(media_data_obj)

        if self.del_xml_flag:
            self.delete_xml(media_data_obj)


    def convert_file_ext(self, media_data_obj):

        """Called by self.tidy_directory().

        Git #472: yt-dlp occasionally downloads .mp4 videos from VK (and
        possibly other websites) whose file extension is mistakenly set to
        .mp4. Convert any such files to .mp4.

        This is an experimental/temporary feature.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        # Import the main window (for convenience)
        main_win_obj = self.app_obj.main_win_obj

        # Get a list of video files in the directory
        container_path = media_data_obj.get_actual_dir(self.app_obj)
        try:
            init_list = os.listdir(container_path)
        except:
            # Can't read the directory
            return

        # Find all .unknown_video files
        for relative_path in init_list:

            # (If self.stop_tidy_operation() has been called, give up
            #   immediately)
            if not self.running_flag:
                return

            file_path = os.path.abspath(
                os.path.join(container_path, relative_path),
            )

            if os.path.isfile(file_path):

                filename, ext = os.path.splitext(relative_path)
                if ext == '.unknown_video':
                    mod_file_path = re.sub(
                        r'\.unknown_video$',
                        '.mp4',
                        file_path,
                    )
                    self.app_obj.move_file_or_directory(
                        file_path,
                        mod_file_path,
                    )
                    self.ext_converted_count += 1


    def check_video_corrupt(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        video are corrupted, don't delete them (let the user do that manually).

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        # Import the main window (for convenience)
        main_win_obj = self.app_obj.main_win_obj

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None \
            and video_obj.dl_flag:

                video_path = video_obj.get_actual_path(self.app_obj)

                if os.path.isfile(video_path):

                    # Code copied from
                    #   mainapp.TartubeApp.update_video_from_filesystem()
                    # When the video file is corrupted, moviepy freezes
                    #   indefinitely
                    # Instead, let's try placing the procedure inside a thread
                    #   (unlike the original function, this one is never called
                    #   if .refresh_moviepy_timeout is 0)
                    this_thread = threading.Thread(
                        target=self.call_moviepy,
                        args=(video_obj, video_path,),
                    )

                    this_thread.daemon = True
                    this_thread.start()
                    this_thread.join(self.app_obj.refresh_moviepy_timeout)
                    if this_thread.is_alive():

                        # moviepy timed out, so assume the video is corrupted
                        self.video_corrupt_count += 1

                        if self.del_corrupt_flag \
                        and os.path.isfile(video_path):

                            # Delete the corrupted file
                            if self.app_obj.remove_file(video_path):
                                self.video_corrupt_deleted_count += 1

                                main_win_obj.output_tab_write_stdout(
                                    1,
                                    '   ' + _(
                                    'Deleted (possibly) corrupted video file:',
                                    ) + ' \'' + video_obj.name + '\'',
                                )

                                self.app_obj.mark_video_downloaded(
                                    video_obj,
                                    False,
                                )

                            else:
                                main_win_obj.output_tab_write_stderr(
                                    1,
                                    '   ' + _(
                                        'Failed to delete (possibly)' \
                                        + ' corrupted video file:',
                                    ) + ' \'' + video_obj.name + '\'',
                                )

                        else:

                            # Don't delete it
                            self.app_obj.main_win_obj.output_tab_write_stdout(
                                1,
                                '   ' + _(
                                    'Video file might be corrupt:',
                                ) + ' \'' + video_obj.name + '\'',
                            )


    def check_videos_exist(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        video should exist, but doesn't (or vice-versa), modify the media.Video
        object's IVs accordingly.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                video_path = video_obj.get_actual_path(self.app_obj)

                if not video_obj.dl_flag \
                and os.path.isfile(video_path):

                    # File exists, but is marked as not downloaded
                    self.app_obj.mark_video_downloaded(
                        video_obj,
                        True,       # Video is downloaded
                        True,       # ...but don't mark it as new
                    )

                    self.video_exist_count += 1

                    self.app_obj.main_win_obj.output_tab_write_stdout(
                        1,
                        '   ' + _(
                            'Video file exists:',
                        ) + ' \'' + video_obj.name + '\'',
                    )

                elif video_obj.dl_flag \
                and not os.path.isfile(video_path):

                    # File doesn't exist, but is marked as downloaded
                    self.app_obj.mark_video_downloaded(
                        video_obj,
                        False,      # Video is not downloaded
                    )

                    self.video_no_exist_count += 1

                    self.app_obj.main_win_obj.output_tab_write_stdout(
                        1,
                        '   ' + _(
                            'Video file doesn\'t exist:',
                        ) + ' \'' + video_obj.name + '\'',
                    )


    def delete_video(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        video exists, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        ext_list = formats.VIDEO_FORMAT_LIST.copy()
        ext_list.extend(formats.AUDIO_FORMAT_LIST)

        for video_obj in media_data_obj.compile_all_videos( [] ):

            video_path = None
            if video_obj.file_name is not None:

                video_path = video_obj.get_actual_path(self.app_obj)

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                video_path = self.check_video_in_actual_dir(
                    media_data_obj,
                    video_obj,
                    video_path,
                )

            if video_path is not None:

                if video_obj.dl_flag \
                and os.path.isfile(video_path):

                    # Delete the downloaded video file
                    if self.app_obj.remove_file(video_path):

                        # Mark the video as not downloaded
                        self.app_obj.mark_video_downloaded(video_obj, False)
                        self.video_deleted_count += 1

                if self.del_others_flag:

                    # Also delete all video/audio files with the same name
                    # There might be thousands of files in the directory, so
                    #   using os.walk() or something like that might be too
                    #   expensive
                    # Also, post-processing might create various artefacts, all
                    #   of which must be deleted
                    for ext in ext_list:

                        other_path = video_obj.get_actual_path_by_ext(
                            self.app_obj,
                            ext,
                        )

                        if os.path.isfile(other_path) \
                        and self.app_obj.remove_file(other_path):
                            self.other_deleted_count += 1

        # For an encore, delete all post-processing artefacts in the form
        #   VIDEO_NAME.fNNN.ext, where NNN is an integer and .ext is one of
        #   the video extensions specified by formats.VIDEO_FORMAT_LIST
        #   (.mkv, etc)
        # (The previous code won't pick them up, but we can delete them all
        #   now.)
        # (The alternative download destination, if set, is not affected.)
        check_list = []
        search_path = media_data_obj.get_default_dir(self.app_obj)

        for (dir_path, dir_name_list, file_name_list) in os.walk(search_path):
            check_list.extend(file_name_list)

        char = '|'
        regex = r'\.f\d+\.(' + char.join(formats.VIDEO_FORMAT_LIST) + ')$'
        for check_path in check_list:
            if re.search(regex, check_path):

                full_path = os.path.abspath(
                    os.path.join(search_path, check_path),
                )

                if os.path.isfile(full_path) \
                and self.app_obj.remove_file(full_path):
                    self.other_deleted_count += 1


    def remove_no_url(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        video has no URL, remove it from the database (but don't delete any
        files).

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.source is None:
                GObject.timeout_add(
                    0,
                    self.app_obj.delete_video,
                    video_obj,
                )

                self.remove_no_url_count += 1


    def remove_duplicate(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        video is not marked as downloaded, and has the same URL as another
        child video (of the same specified media data object) which IS marked
        as downloaded, remove the undownloaded one from the database (but
        don't delete any files).

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        # Compile dictionaries of downloaded and undownloaded URLs
        dl_dict = {}
        not_dl_dict = {}

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.source is not None:
                if video_obj.dl_flag:
                    dl_dict[video_obj.source] = video_obj.dbid
                else:
                    not_dl_dict[video_obj.source] = video_obj.dbid

        # Check undownloaded videos, looking for a matching downloaded video
        for url in not_dl_dict.keys():

            if url in dl_dict:

                # Duplicate found
                dbid = not_dl_dict[url]
                if dbid in self.app_obj.media_reg_dict:

                    duplicate_obj = self.app_obj.media_reg_dict[dbid]
                    GObject.timeout_add(
                        0,
                        self.app_obj.delete_video,
                        duplicate_obj,
                    )

                    self.remove_duplicate_count += 1


    def delete_archive(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks the specified media data object's directory. If a youtube-dl
        archive file is found there, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        archive_path = os.path.abspath(
            os.path.join(
                media_data_obj.get_default_dir(self.app_obj),
                self.app_obj.ytdl_archive_name,
            ),
        )

        # Delete the archive file
        if os.path.isfile(archive_path) \
        and self.app_obj.remove_file(archive_path):
            self.archive_deleted_count += 1


    def move_thumb(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated thumbnail file exists, moves it into its own sub-directory.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                # Thumbnails might be in one of four locations. If the
                #   thumbnail has already been moved into /.thumbs, then of
                #   course we don't move it again (and this function returns an
                #   empty list)
                path_list = utils.find_thumbnail_restricted(
                    self.app_obj,
                    video_obj,
                )

                if path_list:

                    main_path = os.path.abspath(
                        os.path.join(
                            path_list[0], path_list[1],
                        ),
                    )

                    subdir = os.path.abspath(
                        os.path.join(
                            path_list[0], self.app_obj.thumbs_sub_dir,
                        ),
                    )

                    subdir_path = os.path.abspath(
                        os.path.join(
                            path_list[0],
                            self.app_obj.thumbs_sub_dir,
                            path_list[1],
                        ),
                    )

                    if os.path.isfile(main_path) \
                    and not os.path.isfile(subdir_path):

                        if not os.path.isdir(subdir):
                            self.app_obj.make_directory(subdir)

                        if self.app_obj.move_file_or_directory(
                            main_path,
                            subdir_path,
                        ):
                            self.thumb_moved_count += 1


    def delete_thumb(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated thumbnail file exists, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                # Thumbnails might be in one of four locations
                thumb_path = utils.find_thumbnail(self.app_obj, video_obj)

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                if thumb_path is not None:

                    thumb_path = self.check_video_in_actual_dir(
                        media_data_obj,
                        video_obj,
                        thumb_path,
                    )

                # Delete the thumbnail file
                if thumb_path is not None \
                and os.path.isfile(thumb_path) \
                and self.app_obj.remove_file(thumb_path):
                    self.thumb_deleted_count += 1


    def delete_webp(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated .webp thumbnail file exists, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                # Thumbnails might be in one of two locations
                webp_path = utils.find_thumbnail_webp_strict(
                    self.app_obj,
                    video_obj
                )

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                if webp_path is not None:

                    webp_path = self.check_video_in_actual_dir(
                        media_data_obj,
                        video_obj,
                        webp_path,
                    )

                # Delete the thumbnail file
                if webp_path is not None \
                and os.path.isfile(webp_path) \
                and self.app_obj.remove_file(webp_path):
                    self.webp_deleted_count += 1


    def convert_webp(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated thumbnail file in a .webp or malformed .jpg format exists,
        convert it to .jpg.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                # Thumbnails might be in one of four locations
                thumb_path = utils.find_thumbnail_webp_intact_or_broken(
                    self.app_obj,
                    video_obj,
                )

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                if thumb_path is not None:

                    thumb_path = self.check_video_in_actual_dir(
                        media_data_obj,
                        video_obj,
                        thumb_path,
                    )

                if thumb_path is not None \
                and os.path.isfile(thumb_path):

                    # Convert to .jpg
                    if not self.app_obj.ffmpeg_manager_obj.convert_webp(
                        thumb_path
                    ):
                        # FFmpeg is probably not installed; don't try any more
                        #   conversions
                        self.convert_webp_flag = False
                        self.app_obj.set_ffmpeg_fail_flag(True)

                    else:

                        self.webp_converted_count += 1


    def move_data(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated thumbnail file exists, moves it into its own sub-directory.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                # Description/JSON/annotations files might be in one of four
                #   locations. If the file has already been moved into /.data,
                #   then of course we don't move it again
                for ext in ['.description', '.info.json', '.annotations.xml']:

                    main_path = video_obj.get_actual_path_by_ext(
                        self.app_obj,
                        ext,
                    )

                    subdir = os.path.abspath(
                        os.path.join(
                            video_obj.parent_obj.get_actual_dir(self.app_obj),
                            self.app_obj.metadata_sub_dir,
                        ),
                    )

                    subdir_path \
                    = video_obj.get_actual_path_in_subdirectory_by_ext(
                        self.app_obj,
                        ext,
                    )

                    if os.path.isfile(main_path) \
                    and not os.path.isfile(subdir_path):

                        if not os.path.isdir(subdir):
                            self.app_obj.make_directory(subdir)

                        # (os.rename sometimes fails on external hard drives;
                        #   this is safer)
                        if self.app_obj.move_file_or_directory(
                            main_path,
                            subdir_path,
                        ):
                            self.data_moved_count += 1


    def delete_descrip(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated description file exists, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                main_path = video_obj.get_actual_path_by_ext(
                    self.app_obj,
                    '.description',
                )

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                main_path = self.check_video_in_actual_dir(
                    media_data_obj,
                    video_obj,
                    main_path,
                )

                # Delete the description file
                if main_path is not None \
                and os.path.isfile(main_path) \
                and self.app_obj.remove_file(main_path):
                    self.descrip_deleted_count += 1

                # (Repeat for a file that might be in the sub-directory
                #   '.data')
                subdir_path = video_obj.get_actual_path_in_subdirectory_by_ext(
                    self.app_obj,
                    '.description',
                )

                subdir_path = self.check_video_in_actual_dir(
                    subdir_path,
                    video_obj,
                    subdir_path,
                )

                if subdir_path is not None \
                and os.path.isfile(subdir_path) \
                and self.app_obj.remove_file(subdir_path):
                    self.descrip_deleted_count += 1


    def delete_json(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated metadata (JSON) file exists, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                main_path = video_obj.get_actual_path_by_ext(
                    self.app_obj,
                    '.info.json',
                )

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                main_path = self.check_video_in_actual_dir(
                    media_data_obj,
                    video_obj,
                    main_path,
                )

                # Delete the metadata file
                if main_path is not None \
                and os.path.isfile(main_path) \
                and self.app_obj.remove_file(main_path):
                    self.json_deleted_count += 1

                # (Repeat for a file that might be in the sub-directory
                #   '.data')
                subdir_path = video_obj.get_actual_path_in_subdirectory_by_ext(
                    self.app_obj,
                    '.info.json',
                )

                subdir_path = self.check_video_in_actual_dir(
                    media_data_obj,
                    video_obj,
                    subdir_path,
                )

                if subdir_path is not None \
                and os.path.isfile(subdir_path) \
                and self.app_obj.remove_file(subdir_path):
                    self.json_deleted_count += 1


    def delete_xml(self, media_data_obj):

        """Called by self.tidy_directory().

        Checks all child videos of the specified media data object. If the
        associated annotation file exists, delete it.

        Args:

            media_data_obj (media.Channel, media.Playlist or media.Folder):
                The media data object whose directory must be tidied up

        """

        for video_obj in media_data_obj.compile_all_videos( [] ):

            if video_obj.file_name is not None:

                main_path = video_obj.get_actual_path_by_ext(
                    self.app_obj,
                    '.annotations.xml',
                )

                # If the video's parent container has an alternative download
                #   destination set, we must check the corresponding media
                #   data object. If the latter also has a media.Video object
                #   matching this video, then this function returns None and
                #   nothing is deleted
                main_path = self.check_video_in_actual_dir(
                    media_data_obj,
                    video_obj,
                    main_path,
                )

                # Delete the annotation file
                if main_path is not None \
                and os.path.isfile(main_path) \
                and self.app_obj.remove_file(main_path):
                    self.xml_deleted_count += 1

                # (Repeat for a file that might be in the sub-directory
                #   '.data')
                subdir_path = video_obj.get_actual_path_in_subdirectory_by_ext(
                    self.app_obj,
                    '.annotations.xml',
                )

                subdir_path = self.check_video_in_actual_dir(
                    media_data_obj,
                    video_obj,
                    subdir_path,
                )

                if subdir_path is not None \
                and os.path.isfile(subdir_path) \
                and self.app_obj.remove_file(subdir_path):
                    self.xml_deleted_count += 1


    def call_moviepy(self, video_obj, video_path):

        """Called by thread inside self.check_video_corrupt().

        When we call moviepy.editor.VideoFileClip() on a corrupted video file,
        moviepy freezes indefinitely.

        This function is called inside a thread, so a timeout of (by default)
        ten seconds can be applied.

        Args:

            video_obj (media.Video): The video object being updated

            video_path (str): The path to the video file itself

        """

        try:
            clip = moviepy.editor.VideoFileClip(video_path)

        except:
            self.video_corrupt_count += 1

            self.app_obj.main_win_obj.output_tab_write_stdout(
                1,
                '   ' + _('Video file might be corrupt:') + ' \'' \
                + video_obj.name + '\'',
            )


    def check_video_in_actual_dir(self, container_obj, video_obj, delete_path):

        """Called by self.delete_video(), .delete_descrip(), .delete_json(),
        .delete_xml() and .delete_thumb().

        If the video's parent container has an alternative download destination
        set, we must check the corresponding media data object. If the latter
        also has a media.Video object matching this video, then this function
        returns None and nothing is deleted. Otherwise, the specified
        delete_path is returned, so it can be deleted.

        Args:

            container_obj (media.Channel, media.Playlist, media.Folder): A
                channel, playlist or folder

            video_obj (media.Video): A video contained in that channel,
                playlist or folder

            delete_path (str): The path to a file which the calling function
                wants to delete

        Return values:

            The specified delete_path if it can be deleted, or None if it
                should not be deleted

        """

        if container_obj.external_dir is not None \
        or container_obj.dbid == container_obj.master_dbid:

            # No alternative download destination to check
            return delete_path

        else:

            # Get the channel/playlist/folder acting as container_obj's
            #   alternative download destination
            master_obj = self.app_obj.media_reg_dict[container_obj.master_dbid]

            # Check its videos. Are there any videos with the same name?
            for child_obj in master_obj.child_list:

                if child_obj.file_name is not None \
                and child_obj.file_name == video_obj.file_name:

                    # Don't delete the file associated with this video
                    return None

            # There are no videos with the same name, so the file can be
            #   deleted
            return delete_path


    def stop_tidy_operation(self):

        """Called by mainapp.TartubeApp.do_shutdown(), .stop_continue(),
        .on_button_stop_operation() and mainwin.MainWin.on_stop_menu_item().

        Stops the tidy operation.
        """

        self.running_flag = False
