"""Просмотр последних строк лога."""

from pathlib import Path

LOG_FILE = Path("logs/bot.log")
DEFAULT_LINES = 20


def logs(stop_event, bot, lines: int = DEFAULT_LINES):
    """Показать последние строки лога (tail -N)."""
    if stop_event.is_set():
        return None

    if not LOG_FILE.exists():
        print(f"Файл лога не найден: {LOG_FILE}")
        return None

    try:
        with open(LOG_FILE, "r", encoding="utf-8") as f:
            all_lines = f.readlines()
        tail = all_lines[-lines:] if len(all_lines) > lines else all_lines

        print(f"\nПоследние {len(tail)} строк {LOG_FILE}:")
        print("-" * 40)
        print("".join(tail), end="")
        print("-" * 40)
    except OSError as e:
        print(f"Ошибка чтения лога: {e}")