# 3D Gaussian 4D Video Stack Visualizer — Hugging Face Docker Space
FROM python:3.10-slim

# ffmpeg gives OpenCV broad codec support for decoding uploaded videos.
# (opencv-python-headless needs no X libraries, but ffmpeg helps with more formats.)
RUN apt-get update && apt-get install -y --no-install-recommends \
        ffmpeg \
    && rm -rf /var/lib/apt/lists/*

# Hugging Face Spaces run as a non-root user (uid 1000). Create it and a home.
RUN useradd -m -u 1000 user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH \
    PORT=7860 \
    HOST=0.0.0.0 \
    PYTHONUNBUFFERED=1

WORKDIR $HOME/app

# Install Python deps first for better layer caching.
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt

# Copy the application (app.py, static/, video/).
COPY --chown=user . .

# Ensure runtime dirs exist and are owned by the runtime user.
RUN mkdir -p uploads frames && chown -R user:user $HOME/app
USER user

EXPOSE 7860

# gunicorn: single worker (shared on-disk session dirs), several threads for
# concurrent texture requests, generous timeout for large frame extractions.
CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "1", "--threads", "8", \
     "--timeout", "600", "app:app"]