FROM python:3.11-slim

WORKDIR /app

# System dependencies required by opencv-python-headless (ultralytics transitive dep)
RUN apt-get update && apt-get install -y --no-install-recommends \
    libgl1 libglib2.0-0 \
 && rm -rf /var/lib/apt/lists/*

# Install dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir torch torchvision --index-url https://download.pytorch.org/whl/cpu && \
    pip install --no-cache-dir -r requirements.txt

# Pre-bake YOLOv8n weights (6MB) so first request doesn't block
RUN python -c "from ultralytics import YOLO; YOLO('yolov8n.pt')"

# HuggingFace cache directory for transformers + torchxrayvision
ENV HF_HOME=/app/.hf-cache \
    TORCH_HOME=/app/.torch-cache

# Copy app files
COPY . .

# HF Spaces requires port 7860
EXPOSE 7860

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]