# ── 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/

# Copy Alembic migration files
COPY alembic/ alembic/
COPY alembic.ini .

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

USER appuser

EXPOSE 8000

CMD ["gunicorn", "app.main:app", \
     "-k", "uvicorn.workers.UvicornWorker", \
     "--bind", "0.0.0.0:8000", \
     "--workers", "4", \
     "--timeout", "120"]