# ── Kerf Engine — multi-stage Docker build ──
# Standalone raster-to-vector conversion API (no App dependencies)

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

RUN apt-get update && apt-get install -y --no-install-recommends \
        build-essential \
        pkg-config \
        libagg-dev \
        libpotrace-dev \
        libpotrace0 \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /build

# Install Python deps into a virtual-env we can copy later
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

COPY engine/pyproject.toml .
RUN pip install --no-cache-dir . 2>/dev/null || true
# The above may fail because package source isn't present yet — install deps directly
RUN pip install --no-cache-dir \
        "fastapi>=0.110" \
        "uvicorn[standard]>=0.29" \
        "opencv-python-headless>=4.9" \
        "pypotrace>=0.3" \
        "vtracer>=0.6" \
        "python-multipart>=0.0.9" \
        "Pillow>=10.2" \
        "ezdxf>=1.0"

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

# Runtime-only system libs for pypotrace
RUN apt-get update && apt-get install -y --no-install-recommends \
        libpotrace0 \
        libagg2 \
        curl \
    && rm -rf /var/lib/apt/lists/*

# Copy the virtual-env from the builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Copy engine source only — no App code
WORKDIR /app
COPY engine/main.py .
COPY engine/api/ ./api/
COPY engine/pipeline/ ./pipeline/
COPY engine/output/ ./output/
COPY engine/presets/ ./presets/

EXPOSE 8000

HEALTHCHECK --interval=15s --timeout=5s --start-period=10s --retries=3 \
    CMD curl -sf http://localhost:8000/engine/health || exit 1

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