events {
    worker_connections 1024;
}

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

    # 日志格式
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log;

    # 基础配置
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

    # Gzip压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;

    # 上游服务器配置
    upstream ruoyi_backend {
        # 轮询负载均衡
        server ruoyi-admin-9900:9900 weight=1 max_fails=3 fail_timeout=30s;
        server ruoyi-admin-9901:9901 weight=1 max_fails=3 fail_timeout=30s;
        server ruoyi-admin-9902:9902 weight=1 max_fails=3 fail_timeout=30s;
        server ruoyi-admin-9903:9903 weight=1 max_fails=3 fail_timeout=30s;

        # 健康检查
        keepalive 32;
    }

    # 主服务器配置
    server {
        listen 80;
        server_name localhost;

        # 静态资源缓存
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            proxy_pass http://ruoyi_backend;
        }

        # API请求
        location / {
            proxy_pass http://ruoyi_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;

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

            # 缓冲设置
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
            proxy_busy_buffers_size 8k;
        }

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

        # 状态监控页面
        location /nginx_status {
            stub_status on;
            access_log off;
            allow 127.0.0.1;
            deny all;
        }
    }

    # 监控和日志配置
    server {
        listen 8080;
        server_name localhost;

        location / {
            return 200 "Nginx Load Balancer Status\n";
            add_header Content-Type text/plain;
        }

        location /status {
            stub_status on;
            access_log off;
        }
    }
}