# ── Build stage ───────────────────────────────────────────────────────────────
FROM python:3.11-slim AS builder

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

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

# ── Runtime stage ─────────────────────────────────────────────────────────────
FROM python:3.11-slim

# Hugging Face Spaces expects the app to run as a non-root user
RUN useradd -m -u 1000 appuser

WORKDIR /app

# Copy installed packages
COPY --from=builder /install /usr/local

# Copy application code
COPY --chown=appuser:appuser . .

# Ensure sub-packages are importable
RUN touch tasks/__init__.py graders/__init__.py agents/__init__.py

USER appuser

# HF Spaces expects port 7860
EXPOSE 7860

ENV PYTHONUNBUFFERED=1
ENV PYTHONPATH=/app

CMD ["python", "-m", "uvicorn", "server:app", "--host", "0.0.0.0", "--port", "7860"]