# 默认使用本地镜像 local-node:20-alpine（可先执行: docker tag node:20-alpine local-node:20-alpine）
# 也可通过 --build-arg NODE_IMAGE=xxx 指定其他镜像
ARG NODE_IMAGE=node:20-alpine
FROM ${NODE_IMAGE} AS base

FROM base AS deps
# 国内构建若卡在 npm ci，可传 --build-arg NPM_REGISTRY=https://registry.npmmirror.com
ARG NPM_REGISTRY=https://registry.npmjs.org/
RUN apk add --no-cache libc6-compat
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm config set registry "$NPM_REGISTRY" \
    && npm config set fetch-timeout 300000 \
    && npm config set fetch-retries 5
# 使用 BuildKit 缓存 npm 目录，二次构建更快
RUN --mount=type=cache,target=/root/.npm \
    npm ci

# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NODE_ENV=production
RUN npm run build

FROM base AS runner
WORKDIR /app
ENV NODE_ENV=production

RUN addgroup -g 1001 -S nodejs
RUN adduser -S nextjs -u 1001

COPY --from=builder /app/public ./public
# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

ENV PORT=3000
EXPOSE 3000

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