# FlaskPaste Slim Container Image (Distroless)
# Build: podman build -f Containerfile.slim -t flaskpaste:slim .
# Run:   podman run -d -p 5000:5000 -v flaskpaste-data:/app/data flaskpaste:slim
#
# Distroless: No shell, no package manager, minimal attack surface
# For debugging, use the standard Containerfile instead

# Stage 1: Build dependencies (identical to standard build)
FROM python:3.11-slim AS builder

WORKDIR /build

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

# Create virtual environment and upgrade pip
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
RUN pip install --no-cache-dir --upgrade pip wheel

# Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt gunicorn \
    && rm -rf /opt/venv/lib/python*/site-packages/setuptools/_vendor/jaraco.context*.dist-info


# Stage 2: Distroless runtime
FROM gcr.io/distroless/python3-debian12:nonroot

LABEL maintainer="FlaskPaste"
LABEL description="Minimal secure pastebin REST API (distroless)"

WORKDIR /app

# Copy virtual environment from builder
# Note: distroless uses /usr/lib/python3.11 as base, venv provides all deps
COPY --from=builder /opt/venv/lib/python3.11/site-packages /app/.local/lib/python3.11/site-packages

# Copy application files (owned by nonroot user - uid 65532)
COPY --chown=65532:65532 app/ ./app/
COPY --chown=65532:65532 wsgi.py .
COPY --chown=65532:65532 fpaste .

# Environment configuration
ENV PYTHONPATH="/app/.local/lib/python3.11/site-packages"
ENV FLASK_ENV=production
ENV FLASKPASTE_DB=/app/data/pastes.db
ENV PYTHONUNBUFFERED=1
ENV PYTHONDONTWRITEBYTECODE=1

EXPOSE 5000

# Healthcheck without shell (no || exit 1)
HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
    CMD ["python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:5000/health')"]

# Run gunicorn directly via Python module
ENTRYPOINT ["python", "-m", "gunicorn"]
CMD ["--bind", "0.0.0.0:5000", "--workers", "2", "--access-logfile", "-", "wsgi:application"]