# 配置工作进程数，通常设置为 CPU 核心数
worker_processes auto;

# 错误日志配置
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
  worker_connections 1024;
  # 开启多路复用
  use epoll;
}

# 文件描述符限制 - 移到这里，在http块之前
worker_rlimit_nofile 65535;

http {
  # 日志格式定义
  log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                  '$status $body_bytes_sent "$http_referer" '
                  '"$http_user_agent" "$http_x_forwarded_for"';
  
  # 访问日志配置
  access_log /var/log/nginx/access.log main;

  # 高效文件传输设置
  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;
  
  # 连接超时设置
  keepalive_timeout 65;
  keepalive_requests 100;

  # gzip 压缩优化
  gzip on;
  gzip_vary on;
  gzip_comp_level 6;
  gzip_min_length 1000;
  gzip_buffers 16 8k;
  gzip_http_version 1.1;
  # 增加更多文件类型
  gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript application/vnd.ms-fontobject application/x-font-ttf font/opentype image/svg+xml image/x-icon;

  # 全局设置
  # 合理限制请求体大小，根据实际需求调整
  client_max_body_size 10m;
  client_body_buffer_size 128k;
  client_header_timeout 60s;
  client_body_timeout 60s;
  
  server {
    listen 80;
    server_name _;
    gunzip on;
    gzip_static always;
    include /etc/nginx/mime.types;
    absolute_redirect off;
    root /usr/share/nginx/html;

    # 安全相关响应头
    add_header X-Frame-Options SAMEORIGIN;
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options nosniff;
    # 根据实际情况调整 CSP
    # add_header Content-Security-Policy "default-src 'self'";

    # 处理 SPA 应用路由
    location / {
      try_files $uri $uri/ /index.html;
      index index.html index.htm;
    }

    # HTML 和 JSON 文件 - 短缓存策略
    location ~ .*\.(html|json)$ {
      add_header Cache-Control "public, max-age=300, must-revalidate";
    }

    # 静态资源 - 长缓存策略
    location ~ .*\.(jpg|jpeg|png|gif|bmp|webp|svg|ico|ttf|woff|woff2|eot|mp4|mp3|swf)$ {
      add_header Cache-Control "public, max-age=31536000, immutable";
      expires 365d;
      access_log off;
    }

    # JS 和 CSS - 带版本号的长缓存
    location ~ .*\.(js|css)$ {
      add_header Cache-Control "public, max-age=31536000, immutable";
      expires 365d;
      access_log off;
    }

    # 接口转发 - 替换为实际后端地址
    # location ^~ /fg-api {
    #   proxy_http_version 1.1;
    #   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;
    #   proxy_set_header Host $host;

    #   # 后端是HTTPS时的必要配置
    #   proxy_ssl_server_name on;
    #   proxy_ssl_protocols TLSv1.2 TLSv1.3;
    #   proxy_ssl_session_reuse on;
      
    #   # 对于生产环境，应该尽量使用有效的证书而不是依赖``proxy_ssl_verify off;`` ，因为这会带来安全风险
    #   proxy_ssl_verify off;

    #   # TODO：替换为实际后端服务地址
    #   # 注意在URL末尾添加了斜杠，这样Nginx会去掉 /fg-api 前缀
    #   # 前端请求 http://your-domain.com/fg-api/users 转发到 https://ukw0y1.laf.run/users
    #   proxy_pass https://ukw0y1.laf.run/;

    #   # 上面一行的效果与下面2行一样的效果，都是为了去掉 /fg-api 前缀
    #   # 显式移除/fg-api前缀
    #   # rewrite ^/fg-api(.*)$ $1 break; 
    #   # 域名末尾不需要斜杠了
    #   # proxy_pass https://ukw0y1.laf.run;

    #   proxy_connect_timeout 60s;
    #   proxy_send_timeout 60s;
    #   proxy_read_timeout 60s;

    #   proxy_buffers 8 32k;
    #   proxy_buffer_size 64k;
    #   proxy_busy_buffers_size 128k;

    #   proxy_next_upstream error timeout http_500 http_502 http_503 http_504;
    # }

    # 错误页面配置
    error_page 404 /index.html;
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
      root /usr/share/nginx/html;
    }

    # 禁止访问隐藏文件
    location ~ /\. {
      deny all;
      access_log off;
      log_not_found off;
    }
  }
}