# Crack Detection & Measurement — container image for Hugging Face Spaces.
FROM python:3.12-slim

# Runtime library opencv-python-headless needs.
RUN apt-get update && apt-get install -y --no-install-recommends \
        libglib2.0-0 \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Install the CPU-only PyTorch build first — far smaller than the default
# CUDA wheel, and Hugging Face's free hardware is CPU anyway. Pinning the
# same versions means the torch lines in requirements.txt are then no-ops.
RUN pip install --no-cache-dir \
        torch==2.12.0 torchvision==0.27.0 \
        --index-url https://download.pytorch.org/whl/cpu

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

# Hugging Face Spaces routes external traffic to this port.
EXPOSE 7860
CMD ["gunicorn", "--workers", "1", "--threads", "4", "--worker-class", "gthread", \
     "--timeout", "180", "--bind", "0.0.0.0:7860", "app:app"]