FROM python:3.10-slim

WORKDIR /app

RUN apt-get update && apt-get install -y --no-install-recommends libgl1 libglib2.0-0 && rm -rf /var/lib/apt/lists/*

RUN pip install --no-cache-dir torch torchvision --index-url https://download.pytorch.org/whl/cpu

RUN pip install --no-cache-dir realesrgan==0.3.0 fastapi "uvicorn[standard]" python-multipart opencv-python-headless numpy

RUN python - <<'EOF'
import basicsr, os
p = os.path.join(os.path.dirname(basicsr.__file__), 'data', 'degradations.py')
s = open(p).read()
s = s.replace('torchvision.transforms.functional_tensor', 'torchvision.transforms.functional')
open(p, 'w').write(s)
print('basicsr patch applied')
EOF

COPY app.py .

ENV MODEL_PATH=/models/RealESRGAN_x2plus.pth

VOLUME /models

CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8080"]