# BookMate 前端镜像：Next.js（经典 next start 方案，最稳妥）
# 构建上下文是仓库根目录，COPY 路径相对仓库根。

# —— 构建阶段：安装依赖 + 生产构建（NEXT_PUBLIC_API_BASE 在此时内联进浏览器代码）——
FROM node:22-alpine AS builder
WORKDIR /app

# 大陆网络默认走 npmmirror 镜像；可在构建时用 --build-arg 覆盖：
#   docker compose build --build-arg NPM_REGISTRY=https://registry.npmjs.org frontend
ARG NPM_REGISTRY=https://registry.npmmirror.com
ENV npm_config_registry="$NPM_REGISTRY"

COPY frontend/package.json frontend/package-lock.json ./
RUN npm ci

COPY frontend/ .

ARG NEXT_PUBLIC_API_BASE
ENV NEXT_PUBLIC_API_BASE=$NEXT_PUBLIC_API_BASE
RUN npm run build

# —— 运行阶段：最小化拷贝出 .next / node_modules / public ——
FROM node:22-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production

COPY --from=builder /app/package.json /app/package-lock.json ./
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public
COPY --from=builder /app/next.config.ts ./

EXPOSE 3000
CMD ["npm", "run", "start"]
