FROM node:20-bookworm-slim
WORKDIR /app
ENV NODE_ENV=production

COPY package.json package-lock.json* ./
RUN npm install --omit=dev

COPY tools.js http-server.js ./

EXPOSE 4100

HEALTHCHECK --interval=30s --timeout=5s --retries=3 --start-period=10s \
  CMD node -e "fetch('http://localhost:4100/health').then(r => process.exit(r.ok ? 0 : 1)).catch(() => process.exit(1))"

CMD ["node", "http-server.js"]