worker_processes 1;

events {
  worker_connections 1024;
}

http {
  include /etc/nginx/mime.types;
  default_type application/octet-stream;

  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;
  keepalive_timeout 65;

  # Gzip 压缩
  gzip on;
  gzip_vary on;
  gzip_min_length 1024;
  gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss application/rss+xml font/truetype font/opentype application/vnd.ms-fontobject image/svg+xml;

  # 后端 API 地址（运行时环境变量）
  upstream backend {
    server ${UPSTREAM_HOST};
  }

  server {
    listen 5666;
    server_name localhost;

    # API 代理到后端服务（去除 /api 前缀后转发）
    location /api/ {
      rewrite ^/api/(.*)$ /$1 break;
      proxy_pass http://backend;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;

      # 支持WebSocket
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
    }

    location / {
      root /usr/share/nginx/html;
      try_files $uri $uri/ /index.html;
      index index.html;
    }

    error_page 500 502 503 504 /50x.html;

    location = /50x.html {
        root /usr/share/nginx/html;
    }
  }
}