#!/data/data/com.termux/files/usr/bin/python3 -OO
# Copyright 2007-2025 by The SABnzbd-Team (sabnzbd.org)
#
# This program 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 2
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

"""
sabnzbd.nzbstuff - misc
"""
import os
import time
import re
import logging
import datetime
import threading
import functools
import difflib
from typing import List, Dict, Any, Tuple, Optional, Union, BinaryIO, Set

# SABnzbd modules
import sabnzbd
import sabctools
from sabnzbd.constants import (
    GIGI,
    ATTRIB_FILE,
    JOB_ADMIN,
    REPAIR_PRIORITY,
    FORCE_PRIORITY,
    HIGH_PRIORITY,
    NORMAL_PRIORITY,
    LOW_PRIORITY,
    DEFAULT_PRIORITY,
    PAUSED_PRIORITY,
    STOP_PRIORITY,
    RENAMES_FILE,
    MAX_BAD_ARTICLES,
    Status,
    DuplicateStatus,
)
from sabnzbd.misc import (
    to_units,
    cat_to_opts,
    cat_convert,
    int_conv,
    format_time_string,
    calc_age,
    cmp,
    caller_name,
    opts_to_pp,
    pp_to_opts,
    duplicate_warning,
)
from sabnzbd.filesystem import (
    sanitize_foldername,
    get_unique_dir,
    get_admin_path,
    remove_all,
    sanitize_filename,
    set_permissions,
    long_path,
    fix_unix_encoding,
    get_filename,
    get_unique_filename,
    renamer,
    remove_file,
    make_script_path,
    globber,
    is_valid_script,
    has_unwanted_extension,
    create_all_dirs,
    get_basename,
    backup_exists,
    get_new_id,
    save_data,
    load_data,
    save_compressed,
    backup_nzb,
    remove_data,
    strip_extensions,
    get_ext,
)
from sabnzbd.par2file import FilePar2Info, has_par2_in_filename, analyse_par2, parse_par2_file, is_par2_file
from sabnzbd.decorators import synchronized
import sabnzbd.config as config
import sabnzbd.cfg as cfg
import sabnzbd.nzbparser
from sabnzbd.downloader import Server
from sabnzbd.database import HistoryDB
from sabnzbd.deobfuscate_filenames import is_probably_obfuscated

# Name patterns
# In the subject, we expect the filename within double quotes
RE_SUBJECT_FILENAME_QUOTES = re.compile(r'"([^"]*)"')
# Otherwise something that looks like a filename
RE_SUBJECT_BASIC_FILENAME = re.compile(r"\b([\w\-+()' .,]+(?:\[[\w\-/+()' .,]*][\w\-+()' .,]*)*\.[A-Za-z0-9]{2,4})\b")
RE_RAR = re.compile(r"(\.rar|\.r\d\d|\.s\d\d|\.t\d\d|\.u\d\d|\.v\d\d)$", re.I)


##############################################################################
# Trylist
##############################################################################

TRYLIST_LOCK = threading.RLock()


class TryList:
    """TryList keeps track of which servers have been tried for a specific article"""

    # Pre-define attributes to save memory
    __slots__ = ("try_list",)

    def __init__(self):
        # Sets are faster than lists
        self.try_list: Set[Server] = set()

    def server_in_try_list(self, server: Server) -> bool:
        """Return whether specified server has been tried"""
        with TRYLIST_LOCK:
            return server in self.try_list

    def all_servers_in_try_list(self, all_servers: Set[Server]) -> bool:
        """Check if all servers have been tried"""
        with TRYLIST_LOCK:
            return all_servers.issubset(self.try_list)

    def add_to_try_list(self, server: Server):
        """Register server as having been tried already"""
        with TRYLIST_LOCK:
            # Sets cannot contain duplicate items
            self.try_list.add(server)

    def remove_from_try_list(self, server: Server):
        """Remove server from list of tried servers"""
        with TRYLIST_LOCK:
            # Discard does not require the item to be present
            self.try_list.discard(server)

    def reset_try_list(self):
        """Clean the list"""
        with TRYLIST_LOCK:
            self.try_list = set()

    def __getstate__(self):
        """Save the servers"""
        return set(server.id for server in self.try_list)

    def __setstate__(self, servers_ids: List[str]):
        self.try_list = set()
        for server in sabnzbd.Downloader.servers:
            if server.id in servers_ids:
                self.add_to_try_list(server)


##############################################################################
# Article
##############################################################################
ArticleSaver = (
    "article",
    "art_id",
    "bytes",
    "lowest_partnum",
    "decoded",
    "file_size",
    "data_begin",
    "data_size",
    "on_disk",
    "nzf",
    "crc32",
)


class Article(TryList):
    """Representation of one article"""

    # Pre-define attributes to save memory
    __slots__ = ArticleSaver + ("fetcher", "fetcher_priority", "tries")

    def __init__(self, article, article_bytes, nzf):
        super().__init__()
        self.article: str = article
        self.art_id: Optional[str] = None
        self.bytes: int = article_bytes
        self.lowest_partnum: bool = False
        self.fetcher: Optional[Server] = None
        self.fetcher_priority: int = 0
        self.tries: int = 0  # Try count
        self.decoded: bool = False
        self.file_size: Optional[int] = None
        self.data_begin: Optional[int] = None
        self.data_size: Optional[int] = None
        self.on_disk: bool = False
        self.crc32: Optional[int] = None
        self.nzf: NzbFile = nzf

    @synchronized(TRYLIST_LOCK)
    def reset_try_list(self):
        """In addition to resetting the try list, also reset fetcher so all servers
        are tried again. Locked so fetcher setting changes are also protected."""
        self.fetcher = None
        self.fetcher_priority = 0
        super().reset_try_list()

    @synchronized(TRYLIST_LOCK)
    def allow_new_fetcher(self, remove_fetcher_from_try_list: bool = True):
        """Let article get new fetcher and reset try lists of file and job.
        Locked so all resets are performed at once"""
        if remove_fetcher_from_try_list:
            self.remove_from_try_list(self.fetcher)
        self.fetcher = None
        self.tries = 0
        self.nzf.reset_try_list()
        self.nzf.nzo.reset_try_list()

    def get_article(self, server: Server, servers: List[Server]):
        """Return article when appropriate for specified server"""
        if self.fetcher or self.server_in_try_list(server):
            return None

        if server.priority > self.fetcher_priority:
            # Check for higher priority server, taking advantage of servers list being sorted by priority
            for server_check in servers:
                if server_check.priority < server.priority:
                    if server_check.active and not self.server_in_try_list(server_check):
                        # There is a higher priority server, so set article priority and return
                        self.fetcher_priority = server_check.priority
                        return None
                else:
                    # All servers with a higher priority have been checked
                    break

        # If no higher priority servers, use this server
        self.fetcher_priority = server.priority
        self.fetcher = server
        self.tries += 1
        return self

    def get_art_id(self):
        """Return unique article storage name, create if needed"""
        if not self.art_id:
            self.art_id = get_new_id("article", self.nzf.nzo.admin_path)
        return self.art_id

    def search_new_server(self):
        """Search for a new server for this article"""
        # Since we need a new server, this one can be listed as failed
        sabnzbd.BPSMeter.register_server_article_failed(self.fetcher.id)
        self.add_to_try_list(self.fetcher)
        # Servers-list could be modified during iteration, so we need a copy
        for server in sabnzbd.Downloader.servers[:]:
            if server.active and not self.server_in_try_list(server):
                if server.priority >= self.fetcher.priority:
                    self.tries = 0
                    # Allow all servers for this nzo and nzf again (but not this fetcher for this article)
                    self.allow_new_fetcher(remove_fetcher_from_try_list=False)
                    return True

        logging.info("Article %s unavailable on all servers, discarding", self.article)
        return False

    def __getstate__(self):
        """Save to pickle file, selecting attributes"""
        dict_ = {}
        for item in ArticleSaver:
            dict_[item] = getattr(self, item)
        dict_["try_list"] = super().__getstate__()
        return dict_

    def __setstate__(self, dict_):
        """Load from pickle file, selecting attributes"""
        for item in ArticleSaver:
            try:
                setattr(self, item, dict_[item])
            except KeyError:
                # Handle new attributes
                setattr(self, item, None)
        super().__setstate__(dict_.get("try_list", []))
        self.fetcher = None
        self.fetcher_priority = 0
        self.tries = 0

    def __repr__(self):
        return "<Article: article=%s, bytes=%s, art_id=%s>" % (self.article, self.bytes, self.art_id)


##############################################################################
# NzbFile
##############################################################################
class SkippedNzbFile(Exception):
    pass


NzbFileSaver = (
    "date",
    "filename",
    "filename_checked",
    "filepath",
    "type",
    "is_par2",
    "vol",
    "blocks",
    "setname",
    "articles",
    "decodetable",
    "bytes",
    "bytes_left",
    "nzo",
    "nzf_id",
    "deleted",
    "import_finished",
    "crc32",
    "assembled",
    "md5of16k",
)


class NzbFile(TryList):
    """Representation of one file consisting of multiple articles"""

    # Pre-define attributes to save memory
    __slots__ = NzbFileSaver

    def __init__(self, date, subject, raw_article_db, file_bytes, nzo):
        """Setup object"""
        super().__init__()

        self.date: datetime.datetime = date
        self.type: Optional[str] = None
        self.filename: str = sanitize_filename(name_extractor(subject))
        self.filename_checked = False
        self.filepath: Optional[str] = None

        # Identifiers for par2 files
        self.is_par2: bool = False
        self.vol: Optional[int] = None
        self.blocks: Optional[int] = None
        self.setname: Optional[str] = None

        # Articles are removed from "articles" after being fetched
        self.articles: List[Article] = []
        self.decodetable: List[Article] = []

        self.bytes: int = file_bytes
        self.bytes_left: int = file_bytes

        self.nzo: NzbObject = nzo
        self.deleted = False
        self.import_finished = False

        self.crc32: Optional[int] = 0
        self.assembled: bool = False
        self.md5of16k: Optional[bytes] = None

        # Add first article to decodetable, this way we can check
        # if this is maybe a duplicate nzf
        if raw_article_db:
            first_article = self.add_article(raw_article_db.pop(0))
            first_article.lowest_partnum = True

        if self in nzo.files:
            logging.info("File %s occurred twice in NZB, skipping", self.filename)
            raise SkippedNzbFile

        # Create file on disk, which can fail in case of disk errors
        self.nzf_id: str = get_new_id("nzf", nzo.admin_path)
        if not self.nzf_id:
            # Error already shown to user from get_new_id
            raise SkippedNzbFile

        # Any articles left?
        if raw_article_db:
            # Save the rest
            save_data(raw_article_db, self.nzf_id, nzo.admin_path)
        else:
            # All imported
            self.import_finished = True

    def finish_import(self):
        """Load the article objects from disk"""
        logging.debug("Finishing import on %s", self.filename)
        if raw_article_db := load_data(self.nzf_id, self.nzo.admin_path, remove=False):
            for raw_article in raw_article_db:
                self.add_article(raw_article)

            # Make sure we have labeled the lowest part number
            # Also when DirectUnpack is disabled we need to know
            self.decodetable[0].lowest_partnum = True

            # Mark safe to continue
            self.import_finished = True

    def add_article(self, article_info):
        """Add article to object database and return article object"""
        article = Article(article_info[0], article_info[1], self)
        self.articles.append(article)
        self.decodetable.append(article)
        return article

    def remove_article(self, article: Article, success: bool) -> int:
        """Handle completed article, possibly end of file"""
        if article in self.articles:
            self.articles.remove(article)
            if success:
                self.bytes_left -= article.bytes
        return len(self.articles)

    def set_par2(self, setname, vol, blocks):
        """Designate this file as a par2 file"""
        self.is_par2 = True
        self.setname = setname
        self.vol = vol
        self.blocks = int_conv(blocks)

    def update_crc32(self, crc32: Optional[int], length: int) -> None:
        if self.crc32 is None or crc32 is None:
            self.crc32 = None
        else:
            self.crc32 = sabctools.crc32_combine(self.crc32, crc32, length)

    def get_articles(self, server: Server, servers: List[Server], fetch_limit: int) -> List[Article]:
        """Get next articles to be downloaded"""
        articles = []
        for article in self.articles:
            if article := article.get_article(server, servers):
                articles.append(article)
                if len(articles) >= fetch_limit:
                    return articles
        self.add_to_try_list(server)
        return articles

    @synchronized(TRYLIST_LOCK)
    def reset_all_try_lists(self):
        """Reset all try lists. Locked so reset is performed
        for all items at the same time without chance of another
        thread changing any of the items while we are resetting"""
        for art in self.articles:
            art.reset_try_list()
        self.reset_try_list()

    def prepare_filepath(self):
        """Do all checks before making the final path"""
        if not self.filepath:
            self.nzo.verify_nzf_filename(self)
            filename = sanitize_filename(self.filename)
            self.filepath = get_unique_filename(os.path.join(self.nzo.download_path, filename))
            self.filename = get_filename(self.filepath)
        return self.filepath

    @property
    def completed(self):
        """Is this file completed?"""
        return self.import_finished and not bool(self.articles)

    def remove_admin(self):
        """Remove article database from disk (sabnzbd_nzf_<id>)"""
        try:
            logging.debug("Removing article database for %s", self.nzf_id)
            remove_file(os.path.join(self.nzo.admin_path, self.nzf_id))
        except Exception:
            pass

    def __getstate__(self):
        """Save to pickle file, selecting attributes"""
        dict_ = {}
        for item in NzbFileSaver:
            dict_[item] = getattr(self, item)
        dict_["try_list"] = super().__getstate__()
        return dict_

    def __setstate__(self, dict_):
        """Load from pickle file, selecting attributes"""
        for item in NzbFileSaver:
            try:
                setattr(self, item, dict_[item])
            except KeyError:
                # Handle new attributes
                setattr(self, item, None)
        super().__setstate__(dict_.get("try_list", []))

    def __eq__(self, other: "NzbFile"):
        """Assume it's the same file if the number bytes and first article
        are the same or if there are no articles left, use the filenames.
        Some NZB's are just a mess and report different sizes for the same article.
        We used to compare (__eq__) articles based on article-ID, however, this failed
        because some NZB's had the same article-ID twice within one NZF.
        """
        if other and (self.bytes == other.bytes or len(self.decodetable) == len(other.decodetable)):
            if self.decodetable and other.decodetable:
                return self.decodetable[0].article == other.decodetable[0].article
            # Fallback to filename comparison
            return self.filename == other.filename
        return False

    def __hash__(self):
        """Required because we implement eq. The same file can be spread
        over multiple NZO's so we make every NZF unique. Even though
        it's considered bad practice.
        """
        return id(self)

    def __repr__(self):
        return "<NzbFile: filename=%s, bytes=%s, nzf_id=%s>" % (self.filename, self.bytes, self.nzf_id)


##############################################################################
# NzbObject
##############################################################################
class NzbEmpty(Exception):
    pass


class NzbRejected(Exception):
    pass


class NzbPreQueueRejected(Exception):
    pass


class NzbRejectToHistory(Exception):
    def __init__(self, nzo, fail_msg):
        self.nzo: NzbObject = nzo
        self.nzo.fail_msg = fail_msg
        super().__init__()


NzbObjectSaver = (
    "filename",
    "work_name",
    "final_name",
    "bytes",
    "bytes_downloaded",
    "bytes_tried",
    "bytes_missing",
    "bytes_par2",
    "repair",
    "unpack",
    "delete",
    "script",
    "cat",
    "url",
    "groups",
    "avg_date",
    "propagation_delay",
    "md5of16k",
    "extrapars",
    "par2packs",
    "files",
    "files_table",
    "finished_files",
    "status",
    "avg_bps_freq",
    "avg_bps_total",
    "priority",
    "saved_articles",
    "nzo_id",
    "futuretype",
    "removed_from_queue",
    "action_line",
    "unpack_info",
    "fail_msg",
    "nzo_info",
    "custom_name",
    "password",
    "correct_password",
    "next_save",
    "save_timeout",
    "encrypted",
    "bad_articles",
    "duplicate",
    "duplicate_key",
    "oversized",
    "precheck",
    "incomplete",
    "reuse",
    "meta",
    "first_articles",
    "first_articles_count",
    "md5sum",
    "download_path",
    "servercount",
    "unwanted_ext",
    "renames",
    "time_added",
)

NzoAttributeSaver = ("cat", "pp", "script", "priority", "final_name", "password", "url")

# Lock to prevent errors when saving the NZO data
NZO_LOCK = threading.RLock()


class NzbObject(TryList):
    def __init__(
        self,
        filename: str,
        pp: Optional[int] = None,
        script: Optional[str] = None,
        nzb_fp: Optional[BinaryIO] = None,
        futuretype: bool = False,
        cat: Optional[str] = None,
        url: Optional[str] = None,
        priority: Optional[Union[int, str]] = DEFAULT_PRIORITY,
        password: Optional[str] = None,
        nzbname: Optional[str] = None,
        status: str = Status.QUEUED,
        nzo_info: Optional[Dict[str, Any]] = None,
        reuse: Optional[str] = None,
        nzo_id: Optional[str] = None,
        dup_check: bool = True,
    ):
        super().__init__()
        # Use original filename as basis
        self.work_name = self.filename = filename

        # User defined job name
        if nzbname:
            self.final_name = self.work_name = nzbname

        # Extract password if not explicitly set, also on URL-fetches which might have a custom name with password
        self.password = password
        if not self.password:
            # Extract before create_work_name, as it would escape the "/" on Windows
            self.work_name, self.password = scan_password(self.work_name)

            # Check for password also in filename
            if not self.password:
                _, self.password = scan_password(get_basename(filename))

        # Remove trailing .nzb/.par(2) and sanitize
        self.work_name = create_work_name(self.work_name)
        self.final_name = self.work_name

        # Temporary store for custom job name for after URL-fetching
        self.custom_name = nzbname

        # Create a record of the input for pp, script, and priority
        input_pp = pp
        input_script = script
        input_priority = priority if priority != DEFAULT_PRIORITY else None

        # Determine category and find pp/script values based on input
        # Later will be re-evaluated based on import steps
        if pp is None:
            r = u = d = None
        else:
            r, u, d = pp_to_opts(pp)

        self.priority: int = NORMAL_PRIORITY
        self.set_priority(priority)  # Parse priority of input
        self.repair: bool = r  # True if we want to repair this set
        self.unpack: bool = u  # True if we want to unpack this set
        self.delete: bool = d  # True if we want to delete this set
        self.cat = cat  # User-set category
        self.script: Optional[str] = None  # External script for this set
        if is_valid_script(script):
            self.script = script

        # Information fields
        self.url = url
        self.groups = []
        self.avg_date = datetime.datetime(1970, 1, 1, 1, 0)
        self.avg_stamp = 0.0  # Avg age in seconds (calculated from avg_age)
        self.propagation_delay: Optional[float] = None  # Set during parsing
        self.correct_password: Optional[str] = None
        self.time_added: int = int(time.time())  # When the NZB was added to the queue

        # Bookkeeping values
        self.meta = {}
        self.servercount: Dict[str, int] = {}  # Dict to keep bytes per server
        self.direct_unpacker: Optional[sabnzbd.directunpacker.DirectUnpacker] = None  # The DirectUnpacker instance
        self.bytes: int = 0  # Original bytesize
        self.bytes_par2: int = 0  # Bytes available for repair
        self.bytes_downloaded: int = 0  # Downloaded byte
        self.bytes_tried: int = 0  # Which bytes did we try
        self.bytes_missing: int = 0  # Bytes missing
        self.bad_articles: int = 0  # How many bad (non-recoverable) articles

        self.extrapars: Dict[str, List[NzbFile]] = {}  # Holds the extra parfile names for all sets
        self.par2packs: Dict[str, Dict[str, FilePar2Info]] = {}  # Holds the par2info for each file in each set
        self.md5of16k: Dict[bytes, str] = {}  # Holds the md5s of the first-16k of all files in the NZB (hash: name)

        self.files: List[NzbFile] = []  # List of all NZFs
        self.files_table: Dict[str, NzbFile] = {}  # Dictionary of NZFs indexed using NZF_ID
        self.renames: Dict[str, str] = {}  # Dictionary of all renamed files

        self.finished_files: List[NzbFile] = []  # List of all finished NZFs

        # The current status of the nzo eg:
        # Queued, Downloading, Repairing, Unpacking, Failed, Complete
        self.status: str = status

        self.avg_bps_freq = 0
        self.avg_bps_total = 0

        self.first_articles: List[Article] = []
        self.first_articles_count = 0
        self.saved_articles: Set[Article] = set()
        self.nzo_id: Optional[str] = None

        self.duplicate: Optional[str] = None
        self.duplicate_key: Optional[str] = None

        self.futuretype = futuretype
        self.removed_from_queue = False
        self.to_be_removed = False
        self.oversized = False
        self.precheck = False
        self.incomplete = False
        self.unwanted_ext = 0
        self.reuse = reuse
        if self.status == Status.QUEUED and not reuse:
            self.precheck = cfg.pre_check()
            if self.precheck:
                self.status = Status.CHECKING

        # Store one line responses for filejoin/par2/unrar here for history display
        self.action_line = ""
        # Store the results from various filejoin/par2/unrar stages
        self.unpack_info: Dict[str, List[str]] = {}
        # Stores one line containing the last failure
        self.fail_msg = ""
        # Stores various info about the nzo to be
        self.nzo_info: Dict[str, Any] = nzo_info or {}

        self.next_save = None
        self.save_timeout = None
        self.encrypted = 0
        self.url_wait: Optional[float] = None
        self.url_tries = 0
        self.pp_active = False
        self.md5sum: Optional[str] = None

        # Path is empty in case of a future NZB
        self.download_path = ""

        # This is a slot for a future NZB, ready now
        # It can also be a retry of a failed job with no extra NZB-file
        if nzb_fp is None and not reuse:
            # For future NZB, check if we don't already have this in the queue or history
            # based on the custom name supplied by the user or the RSS feed
            if self.custom_name and dup_check:
                self.duplicate_check()
                self.handle_duplicate_action()
            return

        # Re-use existing nzo_id, when a "future" job gets it payload
        if nzo_id:
            self.nzo_id = nzo_id
            sabnzbd.NzbQueue.remove(nzo_id, delete_all_data=False)

        # Apply conversion option to final folder
        if cfg.replace_spaces():
            logging.info("Replacing spaces with underscores in %s", self.final_name)
            self.final_name = self.final_name.replace(" ", "_")
        if cfg.replace_underscores():
            logging.info("Replacing underscores with dots in %s", self.final_name)
            self.final_name = self.final_name.replace("_", ".")
        if cfg.replace_dots():
            logging.info("Replacing dots with spaces in %s", self.final_name)
            self.final_name = self.final_name.replace(".", " ")

        # Reuse the existing directory
        if reuse and os.path.exists(reuse):
            self.download_path = long_path(reuse)
        else:
            # Determine "incomplete" folder
            self.download_path = os.path.join(cfg.download_dir.get_path(), self.work_name)
            self.download_path = get_unique_dir(self.download_path, create_dir=True)
            if not self.download_path:
                raise NzbEmpty
            self.download_path = long_path(self.download_path)
            set_permissions(self.download_path)

        # Always create the admin-directory, just to be sure
        admin_dir = os.path.join(self.download_path, JOB_ADMIN)
        if not os.path.exists(admin_dir):
            create_all_dirs(admin_dir)
        _, self.work_name = os.path.split(self.download_path)

        # When doing a retry or repair, remove old cache-files
        if reuse:
            remove_all(admin_dir, "SABnzbd_nz?_*", keep_folder=True)
            remove_all(admin_dir, "SABnzbd_article_*", keep_folder=True)

        if nzb_fp:
            full_nzb_path = save_compressed(admin_dir, filename, nzb_fp)
            try:
                sabnzbd.nzbparser.nzbfile_parser(full_nzb_path, self)
            except Exception as err:
                self.incomplete = True
                logging.warning(T("Invalid NZB file %s, skipping (error: %s)"), filename, err)
                logging.info("Traceback: ", exc_info=True)

                # Some people want to keep the broken files
                if cfg.allow_incomplete_nzb():
                    self.pause()
                else:
                    self.purge_data()
                    raise NzbEmpty

            # Check against identical checksum or series/season/episode if not repair
            # Have to check for duplicate before saving the backup, as it will
            # trigger the duplicate-detection based on the backup
            if not reuse and dup_check and not self.duplicate and self.priority != REPAIR_PRIORITY:
                self.duplicate_check()

            # Copy to backup
            backup_nzb(full_nzb_path)

        if not self.files and not reuse:
            self.purge_data()
            if self.url:
                logging.warning(T("Empty NZB file %s") + " [%s]", filename, self.url)
            else:
                logging.warning(T("Empty NZB file %s"), filename)
            raise NzbEmpty

        if cat is None:
            for metacat in self.meta.get("category", ()):
                if metacat := cat_convert(metacat):
                    cat = metacat
                    break

        if cat is None:
            for grp in self.groups:
                if cat := cat_convert(grp):
                    break

        # Pickup backed-up attributes when re-using
        if reuse:
            cat, pp, script = self.load_attribs()

        # Determine category and find pp/script values
        self.cat, pp_tmp, self.script, priority = cat_to_opts(cat, pp, script, self.priority)
        self.set_priority(priority)
        self.repair, self.unpack, self.delete = pp_to_opts(pp_tmp)

        # Show first meta-password (if any), when there's no explicit password
        if not self.password and self.meta.get("password"):
            self.password = self.meta.get("password", [None])[0]

        # Check if we expect propagation delay
        if propagation_delay := cfg.propagation_delay():
            if (propagation_delay := self.avg_stamp + float(propagation_delay * 60)) > time.time():
                self.propagation_delay = propagation_delay

        # Run user pre-queue script if set and valid
        if not reuse and make_script_path(cfg.pre_script()):
            # Call the script
            accept, name, pq_pp, pq_cat, pq_script, pq_priority, pq_group = sabnzbd.newsunpack.pre_queue(self, pp, cat)

            if pq_cat:
                # An explicit pp/script/priority set upon adding the job takes precedence
                # over an implicit setting based on the category set by pre-queue
                if input_priority and not pq_priority:
                    pq_priority = input_priority
                if input_pp and not pq_pp:
                    pq_pp = input_pp
                if input_script and not pq_script:
                    pq_script = input_script

            # Accept or reject
            accept = int_conv(accept)
            if accept < 1:
                self.purge_data()
                raise NzbPreQueueRejected
            if accept == 2:
                raise NzbRejectToHistory(self, T("Pre-queue script marked job as failed"))

            # Process all options, only over-write if set by script
            # Beware that cannot do "if priority/pp", because those can
            # also have a valid value of 0, which shouldn't be ignored
            if name:
                self.set_final_name_and_scan_password(name)
                self.duplicate_check(repeat=True)
            try:
                pp = int(pq_pp)
            except Exception:
                pp = None
            if pq_cat:
                cat = pq_cat
            try:
                priority = int(pq_priority)
            except Exception:
                priority = DEFAULT_PRIORITY
            if pq_script and is_valid_script(pq_script):
                script = pq_script
            if pq_group:
                self.groups = [str(pq_group)]

            # Re-evaluate results from pre-queue script
            self.cat, pp, self.script, priority = cat_to_opts(cat, pp, script, priority)
            self.set_priority(priority)
            self.repair, self.unpack, self.delete = pp_to_opts(pp)

        # Pause if requested by the NZB-adding or the pre-queue script
        if self.priority == PAUSED_PRIORITY:
            self.pause()
            self.set_stateless_priority(self.cat)

        # Pause job when above size limit
        limit = cfg.size_limit.get_int()
        if not reuse and abs(limit) > 0.5 and self.bytes > limit:
            logging.info("Job too large, forcing low prio and paused (%s)", self.final_name)
            self.pause()
            self.oversized = True
            self.priority = LOW_PRIORITY

        # Take action on the duplicate status
        self.handle_duplicate_action()

        # Check if there is any unwanted extension in plain sight in the NZB itself
        if cfg.action_on_unwanted_extensions():
            for nzf in self.files:
                if has_unwanted_extension(nzf.filename):
                    logging.warning(T("Unwanted Extension in file %s (%s)"), nzf.filename, self.final_name)
                    # Pause, or Abort:
                    if cfg.action_on_unwanted_extensions() == 1:
                        logging.debug("Unwanted extension ... pausing")
                        self.unwanted_ext = 1
                        self.pause()
                    if cfg.action_on_unwanted_extensions() == 2:
                        logging.debug("Unwanted extension ... aborting")
                        raise NzbRejectToHistory(self, T("Aborted, unwanted extension detected"))

        if reuse:
            self.check_existing_files(self.download_path)

        # Sort the files in the queue
        self.sort_nzfs()

        # Copy meta fields to nzo_info, if not already set
        for kw in self.meta:
            if not self.nzo_info.get(kw):
                self.nzo_info[kw] = self.meta[kw][0]
        logging.debug("NZB nzo-info = %s", self.nzo_info)

        # Set nzo save-delay to minimum 120 seconds
        self.save_timeout = max(120, min(6.0 * self.bytes / GIGI, 300.0))

    def update_download_stats(self, bps, serverid, bytes_received):
        if bps:
            self.avg_bps_total += bps / 1024
            self.avg_bps_freq += 1
        if serverid in self.servercount:
            self.servercount[serverid] += bytes_received
        else:
            self.servercount[serverid] = bytes_received

    def add_nzf(self, nzf: NzbFile):
        """Bookkeeping when adding new files
        Only used during import, so not locked"""
        self.files.append(nzf)
        self.files_table[nzf.nzf_id] = nzf
        self.bytes += nzf.bytes

        # Only now add first article to the list
        if len(nzf.decodetable):
            self.first_articles.append(nzf.decodetable[0])
            self.first_articles_count += 1

        # Count how many bytes are available for repair
        # This is quite unreliable in case of obfuscation and broken par2 files
        if has_par2_in_filename(nzf.filename):
            self.bytes_par2 += nzf.bytes

        logging.info("File %s added to queue", nzf.filename)

    @synchronized(NZO_LOCK)
    def remove_nzf(self, nzf: NzbFile) -> bool:
        if nzf in self.files:
            self.files.remove(nzf)
        if nzf not in self.finished_files:
            self.finished_files.append(nzf)
        nzf.import_finished = True
        nzf.deleted = True
        return not bool(self.files)

    def sort_nzfs(self):
        """Sort the files in the NZO based on name and type
        and then optimize for unwanted extensions search.
        """
        self.files.sort(key=functools.cmp_to_key(nzf_cmp_name))

        # In the hunt for Unwanted Extensions:
        # The file with the unwanted extension often is in the first or the last rar file
        # So put the last rar immediately after the first rar file so that it gets detected early
        if cfg.unwanted_extensions():
            # ... only useful if there are unwanted extensions defined and there is no sorting on date
            logging.debug("Unwanted Extension: putting last rar after first rar")
            firstrarpos = lastrarpos = 0
            for nzfposcounter, nzf in enumerate(self.files):
                if RE_RAR.search(nzf.filename.lower()):
                    # a NZF found with '.rar' in the name
                    if firstrarpos == 0:
                        # this is the first .rar found, so remember this position
                        firstrarpos = nzfposcounter
                    lastrarpos = nzfposcounter
                    lastrarnzf = nzf  # The NZF itself

            if firstrarpos != lastrarpos:
                # at least two different .rar's found
                logging.debug("Unwanted Extension: First rar at %s, Last rar at %s", firstrarpos, lastrarpos)
                logging.debug("Unwanted Extension: Last rar is %s", lastrarnzf.filename)
                try:
                    # Remove and add it back after the position of the first rar
                    self.files.remove(lastrarnzf)
                    self.files.insert(firstrarpos + 1, lastrarnzf)
                except Exception:
                    logging.debug("The lastrar swap did not go well")

    @synchronized(TRYLIST_LOCK)
    def reset_all_try_lists(self):
        """Reset all try lists. Locked so reset is performed
        for all items at the same time without chance of another
        thread changing any of the items while we are resetting"""
        for nzf in self.files:
            nzf.reset_all_try_lists()
        self.reset_try_list()

    @synchronized(NZO_LOCK)
    def postpone_pars(self, parset: str):
        """Move all vol-par files matching 'parset' to the extrapars table"""
        # Create new extrapars if it didn't already exist
        # For example if created when the first par2 file was missing
        if parset not in self.extrapars:
            self.extrapars[parset] = []

        for xnzf in self.files[:]:
            # Allow re-analysis in case the name was changed by yEnc-header
            setname, vol, block = analyse_par2(xnzf.filename)
            # Don't postpone header-only-files, so we can extract all
            # possible md5of16k and par2packs's even if the filenames are bad
            # Usually they are all downloaded as first_articles
            # We match on exact match
            if setname and block and parset.lower() == setname.lower():
                xnzf.set_par2(parset, vol, block)
                # Don't postpone if all par2 are desired and should be kept or not repairing
                if self.repair and not (cfg.enable_all_par() and not cfg.enable_par_cleanup()):
                    self.extrapars[parset].append(xnzf)
                    self.files.remove(xnzf)
                    # Already count these bytes as done
                    self.bytes_tried += xnzf.bytes_left

        # Sort the sets
        for setname in self.extrapars:
            self.extrapars[setname].sort(key=lambda x: x.blocks)

        # Also re-parse all filenames in case par2 came after first articles
        self.verify_all_filenames_and_resort()

    @synchronized(NZO_LOCK)
    def handle_par2(self, nzf: NzbFile, filepath):
        """Check if file is a par2 and build up par2 collection"""
        # Need to remove it from the other set it might be in
        self.remove_extrapar(nzf)

        # Reparse
        setname, vol, block = analyse_par2(nzf.filename, filepath)
        nzf.set_par2(setname, vol, block)

        # Parse the file contents for hashes
        set_id, pack = parse_par2_file(filepath, nzf.nzo.md5of16k)

        # If we couldn't parse it, we ignore it
        if set_id and pack:
            if pack not in self.par2packs.values():
                logging.debug("Got par2pack for set %s", nzf.setname)
                # Verify that we are not over-writing existing set with the same name, but different values
                if setname in self.par2packs:
                    logging.debug("Found duplicate par2pack-setname: %s, using set ID: %s", setname, set_id)
                    setname = set_id
                self.par2packs[setname] = pack
                # See if we need to postpone some pars
                self.postpone_pars(setname)
            else:
                # Need to add this to the set, first need setname
                for setname in self.par2packs:
                    if self.par2packs[setname] == pack:
                        break

                # Change the properties
                nzf.set_par2(setname, vol, block)
                logging.debug("Got additional par2pack for set %s", nzf.setname)

            # Make sure it exists, could be removed by newsunpack
            if setname not in self.extrapars:
                self.extrapars[setname] = []
            self.extrapars[setname].append(nzf)

        elif self.repair:
            # For some reason this par2 file is broken but we still want repair
            self.promote_par2(nzf)

        # Is it an obfuscated file?
        if get_ext(nzf.filename) != ".par2":
            # Do cheap renaming so it gets better picked up by par2
            # Only basename has to be the same
            new_fname = get_unique_filename(os.path.join(self.download_path, "%s.par2" % setname))
            renamer(filepath, new_fname)
            self.renamed_file(get_filename(new_fname), nzf.filename)
            nzf.filename = get_filename(new_fname)

    @synchronized(NZO_LOCK)
    def promote_par2(self, nzf: NzbFile):
        """In case of a broken par2 or missing par2, move another
        of the same set to the top (if we can find it)
        """
        setname, vol, block = analyse_par2(nzf.filename)
        # Now we need to identify if we have more in this set
        if setname and self.repair:
            # Maybe it was the first one
            if setname not in self.extrapars:
                self.postpone_pars(setname)
            # Get the next one
            for new_nzf in self.extrapars[setname]:
                # Add it to the top
                if self.add_parfile(new_nzf):
                    break

    def get_extra_blocks(self, setname: str, needed_blocks: int) -> int:
        """We want par2-files of all sets that are similar to this one
        So that we also can handle multi-sets with duplicate filenames
        Returns number of added blocks in case they are available
        In case of duplicate files for the same set, we might add too
        little par2 on the first add-run, but that's a risk we need to take.
        """
        logging.info("Need %s more blocks, checking blocks", needed_blocks)

        avail_blocks = 0
        block_list = []
        for setname_search in self.extrapars:
            # Do it for our set, or highlight matching one
            # We might catch too many par2's, but that's okay
            if setname_search == setname or difflib.SequenceMatcher(None, setname, setname_search).ratio() > 0.85:
                for nzf in self.extrapars[setname_search]:
                    # Don't count extrapars that are completed already
                    if nzf.completed or nzf in self.finished_files:
                        continue
                    block_list.append(nzf)
                    avail_blocks += nzf.blocks

        # Sort the smallest blocks first
        block_list.sort(key=lambda x: x.blocks, reverse=False)
        logging.info("%s blocks available", avail_blocks)

        # Enough?
        if avail_blocks >= needed_blocks:
            added_blocks = 0
            for new_nzf in block_list:
                if self.add_parfile(new_nzf):
                    added_blocks += new_nzf.blocks
                    if added_blocks >= needed_blocks:
                        break
            else:
                # End of block_list reached with insufficient blocks added
                return 0

            logging.info("Added %s blocks to %s", added_blocks, self.final_name)
            return added_blocks
        else:
            # Not enough
            return 0

    @synchronized(NZO_LOCK)
    def remove_article(self, article: Article, success: bool):
        """Remove article from the NzbFile and do check if it can succeed"""
        job_can_succeed = True
        nzf = article.nzf

        # Update all statistics
        # Ignore bytes from par2 files that were postponed
        if nzf in self.files:
            self.bytes_tried += article.bytes
        if not success:
            # Increase missing bytes counter
            self.bytes_missing += article.bytes

            # Reduce available par2 data if it's a par2 file
            # This will be unreliable in case of obfuscated par2 files!
            if nzf.is_par2:
                self.bytes_par2 -= article.bytes

            # Add extra parfiles when there was a damaged article and not pre-checking
            if self.extrapars and not self.precheck:
                self.prospective_add(nzf)

            # Sometimes a few CRC errors are still fine, abort otherwise
            if self.bad_articles > MAX_BAD_ARTICLES:
                self.abort_direct_unpacker()
        else:
            # Increase counter of actually finished bytes
            self.bytes_downloaded += article.bytes

        # First or regular article?
        if article.lowest_partnum and self.first_articles and article in self.first_articles:
            self.first_articles.remove(article)

            # All first articles done?
            if not self.first_articles:
                # Do we have rename information from par2
                if self.md5of16k:
                    self.verify_all_filenames_and_resort()

                # Check the availability of these first articles
                if cfg.fail_hopeless_jobs() and cfg.fast_fail():
                    job_can_succeed = self.check_first_article_availability()

        # Remove from file-tracking
        articles_left = nzf.remove_article(article, success)
        file_done = not articles_left

        # Only on fully loaded files we can know if it's really done
        if not nzf.import_finished:
            file_done = False

        # File completed, remove and do checks
        if file_done:
            self.remove_nzf(nzf)

        # Check if we can succeed when we have missing articles
        # Skip check if retry or first articles already deemed it hopeless
        if not success and job_can_succeed and not self.reuse and cfg.fail_hopeless_jobs():
            job_can_succeed, _ = self.check_availability_ratio()

        # Abort the job due to failure
        if not job_can_succeed:
            self.fail_msg = T("Aborted, cannot be completed") + " - https://sabnzbd.org/not-complete"
            self.set_unpack_info("Download", self.fail_msg)
            logging.debug('Abort job "%s", due to impossibility to complete it', self.final_name)
            return True, True, True

        # Check if there are any files left here, so the check is inside the NZO_LOCK
        return articles_left, file_done, not self.files

    def check_existing_files(self, wdir: str):
        """Check if downloaded files already exits, for these set NZF to complete"""
        fix_unix_encoding(wdir)

        # Get a list of already present files, ignore folders
        existing_files = globber(wdir, "*.*")

        # Substitute renamed files
        if renames := load_data(RENAMES_FILE, self.admin_path, remove=True):
            for name in renames:
                if name in existing_files or renames[name] in existing_files:
                    if name in existing_files:
                        existing_files.remove(name)
                    existing_files.append(renames[name])
            self.renames = renames

        # Looking for the longest name first, minimizes the chance on a mismatch
        existing_files.sort(key=len)

        # The NZFs should be tried shortest first, to improve the chance on a proper match
        nzfs = self.files[:]
        nzfs.sort(key=lambda x: len(x.filename))

        # Flag files from NZB that already exist as finished
        for existing_filename in existing_files[:]:
            for nzf in nzfs:
                if existing_filename in nzf.filename:
                    logging.info("Matched file %s to %s of %s", existing_filename, nzf.filename, self.final_name)
                    nzf.filename = existing_filename
                    nzf.bytes_left = 0
                    self.remove_nzf(nzf)
                    nzfs.remove(nzf)
                    existing_files.remove(existing_filename)

                    # Set bytes correctly
                    nzf.bytes_left = 0
                    self.bytes_tried += nzf.bytes
                    self.bytes_downloaded += nzf.bytes
                    break

        # Create an NZF for each remaining existing file
        try:
            for existing_filename in existing_files:
                # Create NZF's using basic information
                filepath = os.path.join(wdir, existing_filename)
                logging.info("Existing file %s added to %s", existing_filename, self.final_name)
                tup = os.stat(filepath)
                tm = datetime.datetime.fromtimestamp(tup.st_mtime)
                nzf = NzbFile(tm, existing_filename, [], tup.st_size, self)
                self.files.append(nzf)
                self.files_table[nzf.nzf_id] = nzf
                nzf.filename = existing_filename
                self.remove_nzf(nzf)

                # Set bytes correctly
                nzf.bytes_left = 0
                self.bytes += nzf.bytes
                self.bytes_tried += nzf.bytes
                self.bytes_downloaded += nzf.bytes
        except Exception:
            logging.error(T("Error importing %s"), self.final_name)
            logging.info("Traceback: ", exc_info=True)

        # Process all the par2 files in one go, because handle_par2
        # otherwise updates the byte-counters incorrectly.
        for nzf in self.finished_files:
            filepath = os.path.join(wdir, nzf.filename)
            if is_par2_file(filepath):
                self.handle_par2(nzf, filepath)
                self.bytes_par2 += nzf.bytes

    @property
    def pp(self) -> Optional[int]:
        if self.repair is None:
            return None
        else:
            return opts_to_pp(self.repair, self.unpack, self.delete)

    @property
    def propagation_delay_left(self) -> int:
        """Returns number of propagation minutes remaining, if any.
        It could return seconds, but the numerical value is only used in the queue."""
        if self.propagation_delay:
            if (time_left := self.propagation_delay - time.time()) > 0:
                return int(time_left / 60 + 0.5)
            # We can remove the value, to skip any further calculations
            self.propagation_delay = None
        return 0

    def set_pp(self, value: int):
        self.repair, self.unpack, self.delete = pp_to_opts(value)
        logging.info("Set pp=%s for job %s", value, self.final_name)
        # Abort unpacking if not desired anymore
        if not self.unpack:
            self.abort_direct_unpacker()

    def set_priority(self, value: Optional[Union[int, str]]):
        """Check if this is a valid priority"""
        # When unknown (0 is a known one), set to DEFAULT
        if value == "" or value is None:
            self.priority = DEFAULT_PRIORITY
            return

        # Convert input
        value = int_conv(value)
        if value in (
            REPAIR_PRIORITY,
            FORCE_PRIORITY,
            HIGH_PRIORITY,
            NORMAL_PRIORITY,
            LOW_PRIORITY,
            DEFAULT_PRIORITY,
            PAUSED_PRIORITY,
            STOP_PRIORITY,
        ):
            self.priority = value
            return

        # Invalid value, set to normal priority
        self.priority = NORMAL_PRIORITY

    def set_stateless_priority(self, category: str):
        """Find a priority that doesn't set a job state, starting from the given category,
        for jobs to fall back to after their priority was set to PAUSED or DUP. The fallback
        priority cannot be another state-setting priority or FORCE; the latter could override
        the job state immediately after it was set."""
        cat_options = [category]
        if category != "*":
            cat_options.append("default")

        for cat in cat_options:
            prio = cat_to_opts(cat)[3]
            if prio not in (PAUSED_PRIORITY, FORCE_PRIORITY):
                self.priority = prio
                break
        else:
            self.priority = NORMAL_PRIORITY

    @property
    def labels(self):
        """Return (translated) labels of job"""
        labels = []
        if self.duplicate in (DuplicateStatus.DUPLICATE, DuplicateStatus.SMART_DUPLICATE):
            labels.append(T("DUPLICATE"))
        if self.duplicate in (
            DuplicateStatus.DUPLICATE_ALTERNATIVE,
            DuplicateStatus.SMART_DUPLICATE_ALTERNATIVE,
        ):
            labels.append(T("ALTERNATIVE"))
        if self.encrypted > 0:
            labels.append(T("ENCRYPTED"))
        if self.oversized:
            labels.append(T("TOO LARGE"))
        if self.incomplete:
            labels.append(T("INCOMPLETE"))
        if self.unwanted_ext:
            labels.append(T("UNWANTED"))

        # Waiting for URL fetching
        if isinstance(self.url_wait, float):
            dif = int(self.url_wait - time.time() + 0.5)
            if dif > 0:
                labels.append(T("WAIT %s sec") % dif)

        # Propagation delay label
        if self.propagation_delay_left and self.priority != FORCE_PRIORITY:
            labels.append(T("PROPAGATING %s min") % self.propagation_delay_left)  # Queue indicator: propagation of post

        return labels

    @property
    def final_name_with_password(self):
        if self.password:
            return "%s / %s" % (self.final_name, self.password)
        else:
            return self.final_name

    def set_final_name_and_scan_password(self, name, password=None):
        if isinstance(name, str):
            if password is not None:
                self.password = password
            else:
                name, password = scan_password(name)
                if password is not None:
                    self.password = password

            self.final_name = sanitize_foldername(name)
            self.save_to_disk()

    @property
    def direct_unpack_progress(self) -> Optional[str]:
        """Report status of current Direct Unpack, if one is active"""
        if self.direct_unpacker and self.direct_unpacker.active_instance:
            return self.direct_unpacker.get_formatted_stats()

    @property
    def pp_or_finished(self):
        """We don't want any more articles if we are post-processing or in the final state"""
        return self.pp_active or self.status in (Status.COMPLETED, Status.DELETED, Status.FAILED)

    def pause(self):
        self.status = Status.PAUSED
        # Prevent loss of paused state when terminated
        if self.nzo_id and not self.removed_from_queue:
            self.save_to_disk()

    def resume(self):
        self.status = Status.QUEUED
        if self.encrypted > 0:
            # If user resumes after encryption warning, no more auto-pauses
            self.encrypted = 2
        # If user resumes after warning, reset duplicate/oversized/incomplete/unwanted indicators
        self.oversized = False
        self.incomplete = False
        if self.unwanted_ext:
            # If user resumes after "unwanted" warning, no more auto-pauses
            self.unwanted_ext = 2
        if self.duplicate:
            self.duplicate = DuplicateStatus.DUPLICATE_IGNORED

    @synchronized(NZO_LOCK)
    def add_parfile(self, parfile: NzbFile) -> bool:
        """Add parfile to the files to be downloaded
        Add it to the start so we try it first
        Resets try list just to be sure
        Adjust download-size accordingly
        Returns False when the file couldn't be added
        """
        if not parfile.completed and parfile not in self.files and parfile not in self.finished_files:
            parfile.reset_try_list()
            self.files.insert(0, parfile)
            self.bytes_tried -= parfile.bytes_left
            return True
        return False

    @synchronized(NZO_LOCK)
    def remove_extrapar(self, parfile: NzbFile):
        """Remove par file from any/all sets"""
        for parset in list(self.extrapars):
            if parfile in self.extrapars[parset]:
                self.extrapars[parset].remove(parfile)
            # Remove empty sets, when we found (based on md5of16k pack)
            # that all par2 files actually belong to a different set
            if not self.extrapars[parset]:
                self.extrapars.pop(parset)

    @synchronized(NZO_LOCK)
    def prospective_add(self, nzf: NzbFile):
        """Add par2 files to compensate for missing articles"""
        # Get some blocks!
        if not nzf.is_par2:
            for parset in self.extrapars:
                # Due to strong obfuscation on article-level the parset could have a different name
                # than the files. Because of that we just add the required number of par2-blocks
                # from all the sets. This probably means we get too much par2, but it's worth it.
                blocks_new = 0
                for new_nzf in self.extrapars[parset]:
                    if self.add_parfile(new_nzf):
                        blocks_new += new_nzf.blocks
                        # Enough now?
                        if blocks_new >= self.bad_articles:
                            logging.info("Prospectively added %s repair blocks to %s", blocks_new, self.final_name)
                            break
            # Reset NZO TryList
            self.reset_try_list()

    def add_to_direct_unpacker(self, nzf: NzbFile):
        """Start or add to DirectUnpacker"""
        if not self.direct_unpacker:
            sabnzbd.directunpacker.DirectUnpacker(self)
        self.direct_unpacker.add(nzf)

    def abort_direct_unpacker(self):
        """Abort any running DirectUnpackers"""
        # During nzo creation the property doesn't exist yet
        if hasattr(self, "direct_unpacker") and self.direct_unpacker:
            self.direct_unpacker.abort()

    def check_availability_ratio(self) -> Tuple[bool, float]:
        """Determine if we are still meeting the required ratio"""
        availability_ratio = req_ratio = cfg.req_completion_rate()

        # Rare case where the NZB only consists of par2 files
        if self.bytes > self.bytes_par2:
            # Calculate ratio based on byte-statistics
            availability_ratio = 100 * (self.bytes - self.bytes_missing) / (self.bytes - self.bytes_par2)

        logging.debug(
            "Availability ratio=%.2f, bad articles=%d, total bytes=%d, missing bytes=%d, par2 bytes=%d",
            availability_ratio,
            self.bad_articles,
            self.bytes,
            self.bytes_missing,
            self.bytes_par2,
        )

        # When there is no or little par2, we allow a few bad articles
        # This way RAR-only jobs might still succeed
        if self.bad_articles <= MAX_BAD_ARTICLES:
            return True, req_ratio

        # Check based on availability ratio
        return availability_ratio >= req_ratio, availability_ratio

    def check_first_article_availability(self) -> bool:
        """Use the first articles to see if
        it's likely the job will succeed
        """
        # Ignore this check on retry
        if not self.reuse:
            # Ignore undamaged or small downloads
            if self.bad_articles and self.first_articles_count >= 10:
                # We need a float-division, see if more than 80% is there
                if self.bad_articles / self.first_articles_count >= 0.8:
                    return False
        return True

    @synchronized(NZO_LOCK)
    def set_download_report(self):
        """Format the stats for the history information"""
        # Pretty-format the per-server stats
        if self.servercount:
            # Sort the servers first
            servers = config.get_servers()
            server_names = sorted(
                servers,
                key=lambda svr: "%02d%s" % (servers[svr].priority(), servers[svr].displayname().lower()),
            )
            msgs = [
                "%s=%sB" % (servers[server_name].displayname(), to_units(self.servercount[server_name]))
                for server_name in server_names
                if server_name in self.servercount
            ]
            self.set_unpack_info("Servers", ", ".join(msgs), unique=True)

            # In case there were no bytes available at all of this download
            # we list the number of bytes we used while trying
            if not self.bytes_downloaded:
                self.bytes_downloaded = sum(self.servercount.values())

        # Format information about the download itself
        download_msgs = []
        if self.avg_bps_total and self.bytes_downloaded and self.avg_bps_freq:
            # Get the seconds it took to complete the download
            avg_bps = self.avg_bps_total / self.avg_bps_freq
            download_time = int_conv(self.bytes_downloaded / (avg_bps * 1024))
            self.nzo_info["download_time"] = download_time

            # Format the total time the download took, in days, hours, and minutes, or seconds.
            complete_time = format_time_string(download_time)
            download_msgs.append(
                T("Downloaded in %s at an average of %sB/s") % (complete_time, to_units(avg_bps * 1024))
            )
            download_msgs.append(T("Age") + ": " + calc_age(self.avg_date, True))

        bad = self.nzo_info.get("bad_articles", 0)
        miss = self.nzo_info.get("missing_articles", 0)
        dups = self.nzo_info.get("duplicate_articles", 0)

        if bad:
            download_msgs.append(T("%s articles were malformed") % bad)
        if miss:
            download_msgs.append(T("%s articles were missing") % miss)
        if dups:
            download_msgs.append(T("%s articles had non-matching duplicates") % dups)
        self.set_unpack_info("Download", "<br/>".join(download_msgs), unique=True)

        # Add RSS source
        if rss_feed := self.nzo_info.get("RSS"):
            self.set_unpack_info("RSS", rss_feed, unique=True)
        self.set_unpack_info("Source", self.url or self.filename, unique=True)

    @synchronized(NZO_LOCK)
    def increase_bad_articles_counter(self, bad_article_type: str):
        """Record information about bad articles. Should be called before
        register_article, which triggers the availability check."""
        if bad_article_type not in self.nzo_info:
            self.nzo_info[bad_article_type] = 0
        self.nzo_info[bad_article_type] += 1
        self.bad_articles += 1

    def get_articles(self, server: Server, servers: List[Server], fetch_limit: int) -> List[Article]:
        articles = []
        nzf_remove_list = []

        # Did we go through all first-articles?
        if self.first_articles:
            for article_test in self.first_articles:
                article = article_test.get_article(server, servers)
                if not article:
                    break
                articles.append(article)
                if len(articles) >= fetch_limit:
                    break

        # Move on to next ones
        if not articles:
            for nzf in self.files:
                if nzf.deleted:
                    logging.debug("Skipping existing file %s", nzf.filename)
                else:
                    # Don't try to get an article if server is in try_list of nzf
                    if not nzf.server_in_try_list(server):
                        if not nzf.import_finished:
                            # Only load NZF when it's a primary server
                            # or when it's a backup server without active primaries
                            if sabnzbd.Downloader.highest_server(server):
                                nzf.finish_import()
                                # Still not finished? Something went wrong...
                                if not nzf.import_finished and not self.removed_from_queue:
                                    logging.error(T("Error importing %s"), nzf)
                                    nzf_remove_list.append(nzf)
                                    nzf.nzo.status = Status.PAUSED
                                    continue
                            else:
                                break

                        if articles := nzf.get_articles(server, servers, fetch_limit):
                            break

        # Remove all files for which admin could not be read
        for nzf in nzf_remove_list:
            nzf.deleted = True
            self.files.remove(nzf)

        # If cleanup emptied the active files list, end this job
        if nzf_remove_list and not self.files:
            sabnzbd.NzbQueue.end_job(self)

        if not articles:
            # No articles for this server, block for next time
            self.add_to_try_list(server)
        return articles

    @synchronized(NZO_LOCK)
    def move_top_bulk(self, nzf_ids: List[str]):
        self.cleanup_nzf_ids(nzf_ids)
        if nzf_ids:
            target = list(range(len(nzf_ids)))

            while 1:
                self.move_up_bulk(nzf_ids, cleanup=False)

                pos_nzf_table = self.build_pos_nzf_table(nzf_ids)

                keys = list(pos_nzf_table)
                keys.sort()

                if target == keys:
                    break

    @synchronized(NZO_LOCK)
    def move_bottom_bulk(self, nzf_ids):
        self.cleanup_nzf_ids(nzf_ids)
        if nzf_ids:
            target = list(range(len(self.files) - len(nzf_ids), len(self.files)))

            while 1:
                self.move_down_bulk(nzf_ids, cleanup=False)

                pos_nzf_table = self.build_pos_nzf_table(nzf_ids)

                keys = list(pos_nzf_table)
                keys.sort()

                if target == keys:
                    break

    @synchronized(NZO_LOCK)
    def move_up_bulk(self, nzf_ids, cleanup=True):
        if cleanup:
            self.cleanup_nzf_ids(nzf_ids)
        if nzf_ids:
            pos_nzf_table = self.build_pos_nzf_table(nzf_ids)

            while pos_nzf_table:
                pos = min(pos_nzf_table)
                nzf = pos_nzf_table.pop(pos)

                if pos > 0:
                    tmp_nzf = self.files[pos - 1]
                    if tmp_nzf.nzf_id not in nzf_ids:
                        self.files[pos - 1] = nzf
                        self.files[pos] = tmp_nzf

    @synchronized(NZO_LOCK)
    def move_down_bulk(self, nzf_ids, cleanup=True):
        if cleanup:
            self.cleanup_nzf_ids(nzf_ids)
        if nzf_ids:
            pos_nzf_table = self.build_pos_nzf_table(nzf_ids)

            while pos_nzf_table:
                pos = max(pos_nzf_table)
                nzf = pos_nzf_table.pop(pos)

                if pos < len(self.files) - 1:
                    tmp_nzf = self.files[pos + 1]
                    if tmp_nzf.nzf_id not in nzf_ids:
                        self.files[pos + 1] = nzf
                        self.files[pos] = tmp_nzf

    def verify_nzf_filename(self, nzf: NzbFile, yenc_filename: Optional[str] = None):
        """Get filename from par2-info or from yenc"""
        # Already done?
        if nzf.filename_checked:
            return

        # If writing already started, we can't rename anymore
        if nzf.filepath:
            return

        # If we have the md5, use it to rename
        if nzf.md5of16k and self.md5of16k:
            # Don't check again, even if no match
            nzf.filename_checked = True
            # Find the match and rename
            if nzf.md5of16k in self.md5of16k:
                new_filename = self.md5of16k[nzf.md5of16k]
                # Was it even new?
                if new_filename != nzf.filename:
                    logging.info("Detected filename based on par2: %s -> %s", nzf.filename, new_filename)
                    self.renamed_file(new_filename, nzf.filename)
                    nzf.filename = new_filename
                return

        # Fallback to yenc/nzb name (also when there is no partnum=1)
        # We also keep the NZB name in case it ends with ".par2" (usually correct)
        if (
            yenc_filename
            and yenc_filename != nzf.filename
            and not is_probably_obfuscated(yenc_filename)
            and not sabnzbd.par2file.has_par2_in_filename(nzf.filename)
        ):
            logging.info("Detected filename from yenc or uu: %s -> %s", nzf.filename, yenc_filename)
            self.renamed_file(yenc_filename, nzf.filename)
            nzf.filename = yenc_filename

    @synchronized(NZO_LOCK)
    def verify_all_filenames_and_resort(self):
        """Verify all filenames based on par2 info and then re-sort files.
        Locked so all files are verified at once without interruptions.
        """
        logging.info("Checking all filenames for %s", self.final_name)
        for nzf_verify in self.files:
            self.verify_nzf_filename(nzf_verify)
        logging.info("Re-sorting %s after getting filename information", self.final_name)
        self.sort_nzfs()

        # Also trigger it again for Direct Unpack, if it's active
        if self.direct_unpacker:
            self.direct_unpacker.set_volumes_for_nzo()

    @synchronized(NZO_LOCK)
    def renamed_file(self, name_set, old_name=None):
        """Save renames at various stages (Download/PP)
        to be used on Retry. Accepts strings and dicts.
        """
        if not old_name:
            # Add to dict
            self.renames.update(name_set)
        else:
            self.renames[name_set] = old_name

    @property
    def admin_path(self):
        """Return the full path for my job-admin folder"""
        return long_path(get_admin_path(self.work_name, self.futuretype))

    @property
    def group(self):
        if self.groups:
            return self.groups[0]
        else:
            return None

    @property
    def remaining(self):
        """Return remaining bytes"""
        return self.bytes - self.bytes_tried

    @synchronized(NZO_LOCK)
    def purge_data(self, delete_all_data=True):
        """Remove (all) job data"""
        logging.info(
            "[%s] Purging data for job %s (delete_all_data=%s)", caller_name(), self.final_name, delete_all_data
        )

        # Abort DirectUnpack and let it remove files
        self.abort_direct_unpacker()

        # Remove all cached files
        sabnzbd.ArticleCache.purge_articles(self.saved_articles)

        # Delete all, or just basic files
        if self.futuretype:
            # If duplicate is discarded during URL-fetches, no nzo_id is known yet
            if self.nzo_id:
                # Remove temporary file left from URL-fetches
                remove_data(self.nzo_id, self.admin_path)
        elif delete_all_data:
            remove_all(self.download_path, recursive=True)
        else:
            # We remove any saved articles and save the renames file
            remove_all(self.download_path, "SABnzbd_nz?_*", keep_folder=True)
            remove_all(self.download_path, "SABnzbd_article_*", keep_folder=True)
            save_data(self.renames, RENAMES_FILE, self.admin_path, silent=True)

    def get_nzf_by_id(self, nzf_id: str) -> NzbFile:
        if nzf_id in self.files_table:
            return self.files_table[nzf_id]

    @synchronized(NZO_LOCK)
    def set_unpack_info(self, key: str, msg: str, setname: Optional[str] = None, unique: bool = False):
        """Builds a dictionary containing the stage name (key) and a message
        If unique is present, it will only have a single line message
        """
        # Make sure all messages are strings
        msg = str(msg)

        # Add name of the set
        if setname:
            msg = "[%s] %s" % (setname, msg)

        # Unique messages allow only one line per stage(key)
        if not unique:
            if key not in self.unpack_info:
                self.unpack_info[key] = []
            self.unpack_info[key].append(msg)
        else:
            self.unpack_info[key] = [msg]

    def set_action_line(self, action: Optional[str] = None, msg: Optional[str] = None):
        if action and msg:
            self.action_line = "%s: %s" % (action, msg.strip())
        else:
            self.action_line = ""
        # Make sure it's updated in the interface
        sabnzbd.misc.history_updated()

    @synchronized(NZO_LOCK)
    def save_to_disk(self):
        """Save job's admin to disk"""
        self.save_attribs()
        if self.nzo_id and not self.removed_from_queue:
            save_data(self, self.nzo_id, self.admin_path)

    def save_attribs(self):
        """Save specific attributes for Retry"""
        attribs = {}
        for attrib in NzoAttributeSaver:
            attribs[attrib] = getattr(self, attrib)
        logging.debug("Saving attributes %s for %s", attribs, self.final_name)
        save_data(attribs, ATTRIB_FILE, self.admin_path, silent=True)

    def load_attribs(self) -> Tuple[Optional[str], Optional[int], Optional[str]]:
        """Load saved attributes and return them to be parsed"""
        attribs = load_data(ATTRIB_FILE, self.admin_path, remove=False)
        logging.debug("Loaded attributes %s for %s", attribs, self.final_name)

        # If attributes file somehow does not exist
        if not attribs:
            return None, None, None

        # Only a subset we want to apply directly to the NZO
        for attrib in ("final_name", "priority", "url"):
            # Only set if it is present and has a value
            if attribs.get(attrib):
                setattr(self, attrib, attribs[attrib])

        # Only set password if it wasn't already set
        if not self.password and attribs.get("password"):
            self.password = attribs["password"]

        # Rest is to be used directly in the NZO-init flow
        return attribs["cat"], attribs["pp"], attribs["script"]

    @synchronized(NZO_LOCK)
    def build_pos_nzf_table(self, nzf_ids: List[str]) -> Dict[int, NzbFile]:
        pos_nzf_table = {}
        for nzf_id in nzf_ids:
            if nzf_id in self.files_table:
                nzf = self.files_table[nzf_id]
                pos = self.files.index(nzf)
                pos_nzf_table[pos] = nzf

        return pos_nzf_table

    @synchronized(NZO_LOCK)
    def cleanup_nzf_ids(self, nzf_ids: List[str]):
        for nzf_id in nzf_ids[:]:
            if nzf_id in self.files_table:
                if self.files_table[nzf_id] not in self.files:
                    nzf_ids.remove(nzf_id)
            else:
                nzf_ids.remove(nzf_id)

    def set_duplicate_key(self):
        """Shorthand to set the key once"""
        if not self.duplicate_key:
            show_analysis = sabnzbd.sorting.BasicAnalyzer(self.final_name)

            # We can only set a duplicate key for these types
            if show_analysis.type not in ("tv", "movie", "date"):
                return

            # The key always includes the title, for movies we don't add anything else
            duplicate_key_items = [show_analysis.info.get("title", "")]
            if show_analysis.type == "tv":
                # For TV-shows we add the season and episode
                duplicate_key_items.append(str(show_analysis.info.get("season_num", "")))
                duplicate_key_items.append(str(show_analysis.info.get("episode_num", "")))
            elif show_analysis.type == "date":
                # Add date
                duplicate_key_items.append(str(show_analysis.info.get("year", "")))
                duplicate_key_items.append(str(show_analysis.info.get("month", "")))
                duplicate_key_items.append(str(show_analysis.info.get("day", "")))

            # We allow 1 proper result to bypass the detection, if desired
            if show_analysis.is_proper() and cfg.dupes_propercheck():
                duplicate_key_items.append("proper")

            self.duplicate_key = "/".join(duplicate_key_items).lower()

    def duplicate_check(self, repeat: bool = False):
        """Set the correct duplicate status"""
        if not cfg.no_dupes() and not cfg.no_smart_dupes():
            return

        # Reset status in case of a repeat analysis
        if repeat:
            self.duplicate = None
            self.duplicate_key = None

        duplicate_in_history = smart_duplicate_in_history = False
        duplicate_in_queue = smart_duplicate_in_queue = False

        with HistoryDB() as history_db:
            # Dupe check off just name or nzb contents
            if cfg.no_dupes():
                logging.debug("Duplicate checking NZB %s (md5sum=%s)", self.final_name, self.md5sum)

                duplicate_in_history = history_db.have_name_or_md5sum(self.final_name, self.md5sum)
                logging.debug("Duplicate in history: %s", duplicate_in_history)

                duplicate_in_queue = sabnzbd.NzbQueue.have_name_or_md5sum(self.final_name, self.md5sum)
                logging.debug("Duplicate in queue: %s", duplicate_in_queue)

                # The nzb can already be in the backup while the job is still in the queue, so skip on repeat
                if not repeat and not duplicate_in_history and not duplicate_in_queue and cfg.backup_for_duplicates():
                    duplicate_in_history = backup_exists(self.filename)
                    logging.debug("Duplicate in backup: %s", duplicate_in_history)

            # Dupe check off nzb filename
            if not duplicate_in_history and not duplicate_in_queue and cfg.no_smart_dupes():
                self.set_duplicate_key()
                logging.debug("Smart duplicate checking (%s): %s", self.final_name, self.duplicate_key)
                if self.duplicate_key:
                    smart_duplicate_in_history = history_db.have_duplicate_key(self.duplicate_key)
                    logging.debug("Duplicate in history: %s", smart_duplicate_in_history)

                    smart_duplicate_in_queue = sabnzbd.NzbQueue.have_duplicate_key(self.duplicate_key)
                    logging.debug("Duplicate in queue: %s", smart_duplicate_in_queue)
                else:
                    logging.debug("Unknown type, skipping smart duplicate check")

        # Set the correct status
        if smart_duplicate_in_queue:
            self.duplicate = DuplicateStatus.SMART_DUPLICATE_ALTERNATIVE
        elif duplicate_in_queue:
            self.duplicate = DuplicateStatus.DUPLICATE_ALTERNATIVE
        elif smart_duplicate_in_history:
            self.duplicate = DuplicateStatus.SMART_DUPLICATE
        elif duplicate_in_history:
            self.duplicate = DuplicateStatus.DUPLICATE

    def handle_duplicate_action(self):
        """Handle duplicate detection action"""
        # If the job is set Force in any way, ignore results of duplicate check
        if self.priority == FORCE_PRIORITY:
            self.duplicate = None

        # Take a direct action
        #  1 = Discard
        #  2 = Pause
        #  3 = Fail (move to History)
        #  4 = Tag
        if self.duplicate in (DuplicateStatus.DUPLICATE, DuplicateStatus.SMART_DUPLICATE):
            smart_duplicate = self.duplicate == DuplicateStatus.SMART_DUPLICATE
            if (not smart_duplicate and cfg.no_dupes() == 1) or (smart_duplicate and cfg.no_smart_dupes() == 1):
                # Discard
                duplicate_warning(T('Ignoring duplicate NZB "%s"'), self.final_name)
                self.purge_data()
                raise NzbRejected
            elif (not smart_duplicate and cfg.no_dupes() == 3) or (smart_duplicate and cfg.no_smart_dupes() == 3):
                # Fail (move to History)
                duplicate_warning(T('Failing duplicate NZB "%s"'), self.final_name)
                raise NzbRejectToHistory(self, T("Duplicate NZB"))
            elif (not smart_duplicate and cfg.no_dupes() == 2) or (smart_duplicate and cfg.no_smart_dupes() == 2):
                # Pause
                duplicate_warning(T('Pausing duplicate NZB "%s"'), self.final_name)
                self.pause()
            else:
                # Tag job
                duplicate_warning('%s: "%s"', T("Duplicate NZB"), self.final_name)

        # In case of alternative, just pause (unless only tagging is desired)
        if (self.duplicate == DuplicateStatus.DUPLICATE_ALTERNATIVE and cfg.no_dupes() != 4) or (
            self.duplicate == DuplicateStatus.SMART_DUPLICATE_ALTERNATIVE and cfg.no_smart_dupes() != 4
        ):
            logging.info("Pausing duplicate alternative %s", self.final_name)
            self.pause()

    def __getstate__(self):
        """Save to pickle file, selecting attributes"""
        dict_ = {}
        for item in NzbObjectSaver:
            dict_[item] = getattr(self, item)
        dict_["try_list"] = super().__getstate__()
        return dict_

    def __setstate__(self, dict_):
        """Load from pickle file, selecting attributes"""
        for item in NzbObjectSaver:
            try:
                setattr(self, item, dict_[item])
            except KeyError:
                # Handle new attributes
                setattr(self, item, None)
        super().__setstate__(dict_.get("try_list", []))

        # Set non-transferable values
        self.pp_active = False
        self.avg_stamp = time.mktime(self.avg_date.timetuple())
        self.url_wait = None
        self.url_tries = 0
        self.to_be_removed = False
        self.direct_unpacker = None

        # Attributes added since 3.0.0
        if self.bytes_par2 is None:
            self.bytes_par2 = 0
            for nzf in self.files + self.finished_files:
                if sabnzbd.par2file.has_par2_in_filename(nzf.filename):
                    self.bytes_par2 += nzf.bytes
        if self.download_path is None:
            self.download_path = long_path(os.path.join(cfg.download_dir.get_path(), self.work_name))
        if self.par2packs is None:
            self.par2packs = {}
        if not isinstance(self.saved_articles, set):
            # Converted from list to set
            self.saved_articles = set(self.saved_articles)
        if self.time_added is None:
            # For backward compatibility with older saved NZOs
            self.time_added = 0

    def __repr__(self):
        return "<NzbObject: filename=%s, bytes=%s, nzo_id=%s>" % (self.filename, self.bytes, self.nzo_id)


def nzf_cmp_name(nzf1: NzbFile, nzf2: NzbFile):
    # The comparison will sort .par2 files to the top of the queue followed by .rar files,
    # they will then be sorted by name.
    nzf1_name = nzf1.filename.lower()
    nzf2_name = nzf2.filename.lower()

    # Determine vol-pars
    is_par1 = ".vol" in nzf1_name and ".par2" in nzf1_name
    is_par2 = ".vol" in nzf2_name and ".par2" in nzf2_name

    # mini-par2 in front
    if not is_par1 and nzf1_name.endswith(".par2"):
        return -1
    if not is_par2 and nzf2_name.endswith(".par2"):
        return 1

    # vol-pars go to the back
    if is_par1 and not is_par2:
        return 1
    if is_par2 and not is_par1:
        return -1

    # Prioritize .rar files above any other type of file (other than vol-par)
    m1 = RE_RAR.search(nzf1_name)
    m2 = RE_RAR.search(nzf2_name)
    if m1 and not (is_par2 or m2):
        return -1
    elif m2 and not (is_par1 or m1):
        return 1
    # Force .rar to come before 'r00'
    if m1 and m1.group(1) == ".rar":
        nzf1_name = nzf1_name.replace(".rar", ".r//")
    if m2 and m2.group(1) == ".rar":
        nzf2_name = nzf2_name.replace(".rar", ".r//")
    return cmp(nzf1_name, nzf2_name)


def create_work_name(name: str) -> str:
    """Remove ".nzb" and ".par(2)" and sanitize, skip URL's"""
    if name.find("://") < 0:
        # Invalid charters need to be removed before and after (see unit-tests)
        return sanitize_foldername(strip_extensions(sanitize_foldername(name)))
    else:
        return name.strip()


def scan_password(name: str) -> Tuple[str, Optional[str]]:
    """Get password (if any) from the title"""
    if "http://" in name or "https://" in name:
        return name, None

    # Strip any unwanted usenet-related extensions
    name = strip_extensions(name)

    # Identify any braces
    braces = name[1:].find("{{")
    if braces < 0:
        braces = len(name)
    else:
        braces += 1
    slash = name.find("/")

    # Look for name/password, but make sure that '/' comes before any {{
    if 0 < slash < braces and "password=" not in name:
        # Is it maybe in 'name / password' notation?
        if slash == name.find(" / ") + 1 and name[: slash - 1].strip(". "):
            # Remove the extra space after name and before password
            return name[: slash - 1].strip(". "), name[slash + 2 :]
        if name[:slash].strip(". "):
            return name[:slash].strip(". "), name[slash + 1 :]

    # Look for "name password=password"
    pw = name.find("password=")
    if pw > 0 and name[:pw].strip(". "):
        return name[:pw].strip(". "), name[pw + 9 :]

    # Look for name{{password}}
    if braces < len(name):
        closing_braces = name.rfind("}}")
        if closing_braces > braces and name[:braces].strip(". "):
            return name[:braces].strip(". "), name[braces + 2 : closing_braces]

    # Look again for name/password
    if slash > 0 and name[:slash].strip(". "):
        return name[:slash].strip(". "), name[slash + 1 :]

    # No password found
    return name, None


def name_extractor(subject: str) -> str:
    """Try to extract a file name from a subject line, return `subject` if in doubt"""
    # Filename nicely wrapped in quotes
    for name in re.findall(RE_SUBJECT_FILENAME_QUOTES, subject):
        if name := name.strip(' "'):
            return name

    # Found nothing? Try a basic filename-like search
    for name in re.findall(RE_SUBJECT_BASIC_FILENAME, subject):
        if name := name.strip():
            return name

    # Return the subject
    return subject
