import json
import subprocess
from pathlib import Path
from typing import Tuple, List

from core.errors import bad_request
from core.config import settings


def extract_metadata_and_captions(
    url: str,
    workdir: str,
) -> Tuple[dict, List[Path]]:
    cmd = [
        "yt-dlp",
        "--skip-download",
        "--write-subs",
        "--write-auto-subs",
        "--sub-format", "vtt",
        "--no-playlist",
        "--print-json",
        "-o", f"{workdir}/%(id)s",
        url,
    ]

    try:
        result = subprocess.run(
            cmd,
            capture_output=True,
            text=True,
            check=True,
            timeout=settings.request_timeout,
        )
    except subprocess.TimeoutExpired:
        bad_request("yt-dlp timed out", "TIMEOUT")
    except subprocess.CalledProcessError:
        bad_request("Failed to extract video data", "YTDLP_ERROR")

    lines = result.stdout.splitlines()
    if not lines:
        bad_request("No metadata returned from yt-dlp", "EMPTY_RESPONSE")

    try:
        metadata = json.loads(lines[0])
    except json.JSONDecodeError:
        bad_request("Invalid metadata returned from yt-dlp", "INVALID_METADATA")

    subtitle_files = list(Path(workdir).glob("*.vtt"))

    return metadata, subtitle_files