import re
import html
from typing import Optional


def escape_html(text: str) -> str:
    if text is None:
        return ""
    return html.escape(str(text))


def strip_html(text: str) -> str:
    return re.sub("<[^>]+>", "", text)


def safe_int(value) -> Optional[int]:
    try:
        return int(float(value))
    except (TypeError, ValueError):
        return None


def format_size(size_bytes) -> str:
    if size_bytes is None:
        return ""
    
    try:
        size_bytes = float(size_bytes)
    except (TypeError, ValueError):
        return str(size_bytes)

    units = ["B", "KB", "MB", "GB", "TB", "PB"]
    unit_index = 0
    
    while size_bytes >= 1024 and unit_index < len(units) - 1:
        size_bytes /= 1024
        unit_index += 1

    if unit_index == 0:
        return f"{int(size_bytes)} {units[unit_index]}"
    else:
        return f"{size_bytes:.1f} {units[unit_index]}"


def plural_sectors(n: int) -> str:
    n = abs(int(n))
    if 11 <= n % 100 <= 19:
        return "\u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u043d\u044b\u0445 \u0441\u0435\u043a\u0442\u043e\u0440\u043e\u0432"
    last = n % 10
    if last == 1:
        return "\u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u043d\u044b\u0439 \u0441\u0435\u043a\u0442\u043e\u0440"
    if 2 <= last <= 4:
        return "\u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u043d\u044b\u0445 \u0441\u0435\u043a\u0442\u043e\u0440\u0430"
    return "\u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u043d\u044b\u0445 \u0441\u0435\u043a\u0442\u043e\u0440\u043e\u0432"