# ============================================
# 前端镜像 — 宿主机构建 dist，Docker 打包 Nginx
# 启动时通过 BACKEND_PROXY 环境变量指定后端地址
# ============================================
FROM nginx:alpine

LABEL maintainer="ghb-base deploy"

# 安装 envsubst（gettext 包提供）
RUN apk add --no-cache gettext

COPY deploy/nginx/default.conf /etc/nginx/templates/default.conf.template

COPY dist /usr/share/nginx/html

EXPOSE 80

# envsubst 会将模板中 ${BACKEND_PROXY} 替换为实际值
# 单体模式: http://ghb-backend:8081/ghb
# Cloud 模式: http://ghb-gateway:9999/ghb
ENV BACKEND_PROXY=http://ghb-backend:8081/ghb

CMD ["/bin/sh", "-c", "envsubst '${BACKEND_PROXY}' < /etc/nginx/templates/default.conf.template > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'"]