import os
import yt_dlp


def download_video(yt_url: str) -> str:
    BASE_DIR = os.path.dirname(os.path.abspath(__file__))
    DOWNLOADS = os.path.join(BASE_DIR, "downloads")

    ydl_opts = {
        'format': 'bestvideo+bestaudio/best',
        'merge_output_format': 'mp4',
        'outtmpl': f'{DOWNLOADS}/%(title)s.%(ext)s',
    }

    with yt_dlp.YoutubeDL(ydl_opts) as ydl:
        os.makedirs(DOWNLOADS, exist_ok=True)
        info = ydl.extract_info(yt_url, download=True)
        filename = ydl.prepare_filename(info)

    return filename