FROM python:3.11-slim

# Install build dependencies for packages such as uvicorn[standard]
RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential git && \
    rm -rf /var/lib/apt/lists/*

# Create the non-root user expected by Hugging Face Spaces
RUN useradd -m -u 1000 user

USER user

ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH \
    PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PORT=7860

WORKDIR $HOME/app

# Install Python dependencies first to leverage Docker 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 rest of the application code
COPY --chown=user . .

# Expose the port expected by Hugging Face Spaces
EXPOSE 7860

# Run the FastAPI app from the backend directory so local imports resolve
WORKDIR $HOME/app/app/backend

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