# DNS 解析：nginx 只在启动时解析一次 upstream 主机名，admin-svr 重建换 IP 后
# /api/ 会一直 502。127.0.0.11 是 Docker 内置 DNS，resolve + zone 让运行期自动跟随。
resolver 127.0.0.11 valid=10s ipv6=off;

upstream gw_admin_svr { zone gw_admin_svr 64k; server admin-svr:8008 resolve; }

server {
    listen 80;
    root /usr/share/nginx/html;
    index index.html;

    charset utf-8;
    client_max_body_size 200m;
    access_log /var/log/nginx/access_admin-ui.log;
    error_log /var/log/nginx/error_admin-ui.log;

    # 入口 HTML 不强缓存，保证发布后立即生效
    location = /index.html {
        try_files $uri =404;
        add_header Cache-Control no-cache,no-store,must-revalidate always;
        add_header Pragma no-cache always;
        add_header Expires 0 always;
    }

    # 运行时配置文件不强缓存
    location ~* ^/(?:_app[.]config[.]js|config[.]json|menu-setting[.]json|setting[.]json)$ {
        try_files $uri =404;
        add_header Cache-Control no-cache,no-store,must-revalidate always;
        add_header Pragma no-cache always;
        add_header Expires 0 always;
    }

    # 带 hash 的静态资源长期缓存
    location ~* ^/(?:js|jse|css)/ {
        try_files $uri =404;
        add_header Cache-Control public,max-age=31536000,immutable always;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }

    # 后端 API 转发（同 compose 内服务名）
    location /api/ {
        proxy_set_header Connection upgrade;
        proxy_set_header Upgrade $http_upgrade;
        proxy_http_version 1.1;
        chunked_transfer_encoding off;
        proxy_pass http://gw_admin_svr/api/v1/;
        proxy_redirect off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # 上传文件目录（与 admin-svr 共享同一挂载卷）
    location /upload/ {
        alias /app/upload/;
    }

    location /app/upload/ {
        alias /app/upload/;
    }

    gzip on;
    gzip_types text/plain application/javascript text/css application/json;
}