# ===============================
# 1) 依赖安装 + 构建阶段
# ===============================
FROM node:16-alpine AS build

WORKDIR /app

# 只拷贝 package.json，加快缓存命中
COPY package.json ./

# 预先安装依赖（利用缓存）
RUN npm install --registry=https://registry.npmmirror.com

# 拷贝全部代码
COPY . .

# 通过构建参数传入构建环境（如 sit/test/prod）
ARG BUILD_ENV=sit
ENV BUILD_ENV=${BUILD_ENV}

# 要求 package.json 中的 script 形如：build:sit, build:test, build:prod
RUN npm run build:${BUILD_ENV}

# ===============================
# 2) 生产镜像阶段
# ===============================
FROM nginx:1.25-alpine AS runtime

# 清理默认 nginx 静态内容
RUN rm -rf /usr/share/nginx/html/*

# 拷贝 build 结果
COPY --from=build /app/dist /usr/share/nginx/html/

# 权限
RUN chmod -R 755 /usr/share/nginx/html

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]