FROM python:3.10-slim

# HF Spaces runs containers as UID 1000
RUN useradd -m -u 1000 user
USER user

ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH \
    HF_HOME=/home/user/.cache/huggingface

WORKDIR /home/user/app

# Install CPU-only PyTorch first (separate wheel index)
RUN pip install --no-cache-dir --user \
    torch==2.4.0 torchvision==0.19.0 torchaudio==2.4.0 \
    --index-url https://download.pytorch.org/whl/cpu

# Install remaining dependencies
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# Pre-download ProtT5-XL at build time so users never wait for it
RUN python -c "\
from huggingface_hub import snapshot_download; \
snapshot_download('Rostlab/prot_t5_xl_half_uniref50-enc')"

COPY --chown=user . .

EXPOSE 7860
CMD ["python", "app.py"]