Dockerfile

# ═══════════════════════════════════════════════════════════
#  Kentro – Nigerian Draughts  |  Multi-stage Docker build
#  Stage 1: unzip source
#  Stage 2: build React frontend
#  Stage 3: compile Go backend
#  Stage 4: Python runtime (SCAN engine bridge)
# ═══════════════════════════════════════════════════════════

# ── 1. Unpack ─────────────────────────────────────────────
FROM alpine:3.19 AS unpacker
WORKDIR /src
RUN apk add --no-cache unzip
COPY kentro_src.zip .
RUN unzip -q kentro_src.zip && rm kentro_src.zip

# ── 2. Frontend (React + Vite + Tailwind) ─────────────────
FROM node:20-alpine AS frontend
WORKDIR /app
COPY --from=unpacker /src/frontend/package*.json ./
RUN npm install --silent
COPY --from=unpacker /src/frontend/ .
RUN npm run build

# ── 3. Backend (Go) ───────────────────────────────────────
FROM golang:1.22-alpine AS backend
WORKDIR /app
RUN apk add --no-cache gcc musl-dev
COPY --from=unpacker /src/backend/ .
RUN go mod tidy && go mod download
RUN CGO_ENABLED=1 GOOS=linux \
    go build -ldflags="-s -w" -o server ./cmd/server

# ── 4. Runtime ────────────────────────────────────────────
FROM python:3.11-slim
WORKDIR /app

RUN apt-get update && \
    apt-get install -y --no-install-recommends ca-certificates libgcc-s1 && \
    rm -rf /var/lib/apt/lists/*

# Go binary + frontend assets
COPY --from=backend   /app/server          ./server
COPY --from=frontend  /app/dist/           ./frontend/dist/

# Python engine bridge + board logic
COPY --from=unpacker /src/engine_bridge.py      .
COPY --from=unpacker /src/nigerian_draughts.py  .
COPY --from=unpacker /src/kivy_stub.py          .

# SCAN engine binary + config + eval weights
COPY --from=unpacker /src/scan_nigerian         ./scan_nigerian
COPY --from=unpacker /src/scan.ini              .
COPY --from=unpacker /src/data/                 ./data/

# Permissions + non-root user
RUN chmod +x ./scan_nigerian && \
    useradd -r -u 1001 -s /bin/false appuser && \
    chown -R appuser:appuser /app && \
    mkdir -p /data && chown appuser:appuser /data

USER appuser
EXPOSE 7860

ENV PORT=7860 \
    STATIC_DIR=/app/frontend/dist

CMD ["./server"]