from __future__ import annotations

import logging
import shlex
import subprocess
from pathlib import Path
from typing import Sequence

logger = logging.getLogger(__name__)


def _run_ffmpeg(args: Sequence[str]) -> None:
    cmd = ["ffmpeg", "-hide_banner", "-loglevel", "error", *args]
    logger.debug("Executando ffmpeg: %s", " ".join(shlex.quote(part) for part in cmd))
    completed = subprocess.run(cmd, check=False)
    if completed.returncode != 0:
        raise RuntimeError(f"ffmpeg falhou com exit code {completed.returncode}")


def extract_audio_to_wav(input_video: Path, output_wav: Path) -> Path:
    _run_ffmpeg(
        [
            "-y",
            "-i",
            str(input_video),
            "-ac",
            "1",
            "-ar",
            "16000",
            "-vn",
            str(output_wav),
        ]
    )
    return output_wav


def create_video_segment(input_video: Path, start: float, end: float, output_path: Path) -> Path:
    duration = max(0.01, end - start)
    _run_ffmpeg(
        [
            "-y",
            "-i",
            str(input_video),
            "-ss",
            f"{start:.3f}",
            "-t",
            f"{duration:.3f}",
            "-c",
            "copy",
            str(output_path),
        ]
    )
    return output_path