# 定义网关服务的负载均衡组
upstream gateway_load_balance {
    server 139.224.150.79:9010;  # 管理节点服务器上的网关实例
    server 139.224.149.150:9011;  # 工作节点服务器上的网关实例
}

server {
    listen 2668;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # 静态资源处理 - 必须放在最前面
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot|map)$ {
        # ✅ 关键：添加 try_files 指令
        try_files $uri =404;

        # 确保静态资源有正确的过期时间和缓存头
        expires 1y;
        add_header Cache-Control "public, immutable";

        # 为静态资源添加CORS头
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization' always;

        # 处理OPTIONS请求（CORS预检）
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Length' 0;
            add_header 'Content-Type' 'text/plain; charset=UTF-8';
            return 204;
        }
    }

    # 代理API请求到网关服务
    location /api/ {
        # 负载均衡到两个网关服务实例
        proxy_pass http://gateway_load_balance/;

        # 代理设置
        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;

        # 超时设置
        proxy_connect_timeout 30s;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;

        # 缓冲区设置
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;

        # CORS 头
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization' always;

        # 处理OPTIONS请求（CORS预检）
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Length' 0;
            add_header 'Content-Type' 'text/plain; charset=UTF-8';
            return 204;
        }
    }

    # 健康检查接口
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }

    # 前端路由处理 - 放在最后，作为兜底规则
    location / {
        try_files $uri $uri/ /index.html; # 处理Vue路由history模式

        # 为页面添加CORS头
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization' always;
    }
}