FROM node:22-alpine

WORKDIR /app

ENV NODE_ENV=production
ENV PORT=3000
ENV STATE_FILE_PATH=/data/state.json

COPY package.json ./
COPY src ./src
COPY README.md ./README.md
COPY spec.md ./spec.md

EXPOSE 3000
VOLUME ["/data"]

HEALTHCHECK --interval=30s --timeout=5s --retries=3 CMD node -e "fetch('http://127.0.0.1:'+process.env.PORT+'/health').then((r)=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"

CMD ["node", "src/server.js"]