ARG NODE_IMAGE=node:24-alpine3.24

FROM ${NODE_IMAGE} AS deps
WORKDIR /app/backend
COPY backend/package*.json ./
RUN npm ci

FROM ${NODE_IMAGE} AS build
WORKDIR /app/backend
COPY --from=deps /app/backend/node_modules node_modules
COPY backend ./
RUN npm run build
RUN npm prune --omit=dev

FROM ${NODE_IMAGE} AS runtime
WORKDIR /app/backend
ENV NODE_ENV=production
COPY --from=build /app/backend/dist dist
COPY --from=build /app/backend/package*.json ./
COPY --from=build /app/backend/node_modules node_modules
EXPOSE 3001
HEALTHCHECK --interval=10s --timeout=3s --start-period=60s --retries=3 \
  CMD ["node", "-e", "const http=require('http');http.get('http://127.0.0.1:'+(process.env.PORT||3001)+'/api/health',r=>process.exit(r.statusCode===200?0:1)).on('error',()=>process.exit(1))"]
CMD ["node", "dist/index.js"]