# ── Stage 1: dependency builder ───────────────────────────────────────────────
FROM python:3.11-slim AS builder

WORKDIR /build

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

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

# ── Stage 2: runtime ──────────────────────────────────────────────────────────
FROM python:3.11-slim AS runtime

# Non-root user (required on Hugging Face Spaces)
RUN useradd -m -u 1000 appuser

WORKDIR /app

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

# Copy application source
COPY --chown=appuser:appuser app/ app/
COPY --chown=appuser:appuser data/ data/

# Create writable output directories
RUN mkdir -p /app/data /app/models && chown -R appuser:appuser /app

USER appuser

# Hugging Face Spaces requires port 7860
EXPOSE 7860

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=15s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:7860/health')"

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