# Help Service - Bulletproof Production Dockerfile
# Security-hardened, multi-stage build

# =============================================================================
# Stage 1: Build dependencies
# =============================================================================
FROM python:3.13-slim-bookworm AS builder

WORKDIR /build

COPY requirements.txt .
RUN pip install --no-cache-dir --user --no-warn-script-location -r requirements.txt

# =============================================================================
# Stage 2: Production image
# =============================================================================
FROM python:3.13-slim-bookworm

# OCI Labels
LABEL org.opencontainers.image.title="Help Service"
LABEL org.opencontainers.image.description="Documentation help service for Kurs-Booking"
LABEL org.opencontainers.image.vendor="webideas24"
LABEL org.opencontainers.image.version="1.0.0"
LABEL org.opencontainers.image.source="https://git.islandpferde-melanieworbs.de/webideas24/help-service"

# Security: Install tini and minimal runtime dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    tini \
    curl \
    ca-certificates \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
    && rm -rf /root/.cache

WORKDIR /app

# Copy Python packages from builder
COPY --from=builder /root/.local /home/helpuser/.local

# Security: Create non-root user with no shell
RUN groupadd -r -g 1000 helpuser && \
    useradd -r -u 1000 -g helpuser -s /usr/sbin/nologin -d /home/helpuser helpuser && \
    chown -R helpuser:helpuser /app /home/helpuser

# Copy application files
COPY --chown=helpuser:helpuser app.py ./
COPY --chown=helpuser:helpuser content/ ./content/
COPY --chown=helpuser:helpuser templates/ ./templates/
COPY --chown=helpuser:helpuser static/ ./static/

# Switch to non-root user
USER helpuser

# Environment
ENV PATH=/home/helpuser/.local/bin:$PATH \
    PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1

EXPOSE 5000

STOPSIGNAL SIGTERM

HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
    CMD curl -fsS http://localhost:5000/health || exit 1

ENTRYPOINT ["/usr/bin/tini", "--"]
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "2", "--threads", "4", "--timeout", "30", "--graceful-timeout", "10", "app:app"]