import subprocess
import os
from typing import Optional
from ..config import settings


def get_video_duration(path: str) -> Optional[float]:
    cmd = [
        "ffprobe",
        "-v",
        "error",
        "-show_entries",
        "format=duration",
        "-of",
        "default=noprint_wrappers=1:nokey=1",
        path,
    ]
    result = subprocess.run(cmd, capture_output=True, text=True)
    if result.returncode == 0 and result.stdout.strip():
        return float(result.stdout.strip())
    return None


def extract_audio(video_path: str, output_path: str, sample_rate: int = 16000) -> str:
    cmd = [
        "ffmpeg",
        "-y",
        "-i",
        video_path,
        "-vn",
        "-acodec",
        "pcm_s16le",
        "-ar",
        str(sample_rate),
        "-ac",
        "1",
        output_path,
    ]
    result = subprocess.run(cmd, capture_output=True, text=True)
    if result.returncode != 0:
        raise RuntimeError(f"Audio extraction failed: {result.stderr}")
    return output_path


def build_output_path(video_path: str) -> str:
    base, ext = os.path.splitext(os.path.basename(video_path))
    return f"{base}_en_da_audio{ext}"