FROM python:3.12-slim

# ffmpeg is non-negotiable — yt-dlp will silently fail without it
RUN apt-get update && apt-get install -y --no-install-recommends \
    ffmpeg \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Install deps first so Docker layer cache doesn't rebuild on code changes
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY main.py .

EXPOSE 8000

CMD ["python3", "main.py"]