# ── builder ──────────────────────────────────────────────────────────────────
FROM python:3.12-slim AS builder

WORKDIR /build

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

# ── runtime ──────────────────────────────────────────────────────────────────
FROM python:3.12-slim AS runtime

# Non-root user
RUN addgroup --system appgroup && adduser --system --ingroup appgroup appuser

WORKDIR /app

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

# Copy application source
COPY app/ app/

# Ensure appuser owns the working directory
RUN chown -R appuser:appgroup /app

USER appuser

EXPOSE 8000

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "2"]