user www-data;
worker_processes auto;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

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

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 20M;

    server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name _;
        server_tokens off;

        # 前端静态文件
        root /usr/share/nginx/html;
        index index.html;

        # 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;

        # API 请求代理到后端 FastAPI
        location ^~ /api/ {
            proxy_pass http://127.0.0.1:8000;
            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 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;

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

        # 前端路由 - 支持 Vue Router 的 History 模式
        location / {
            try_files $uri $uri/ /index.html;

            # 缓存策略
            location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
                expires 1y;
                add_header Cache-Control "public, immutable";
            }

            # HTML 文件不缓存
            location ~* \.html$ {
                expires -1;
                add_header Cache-Control "no-cache, no-store, must-revalidate";
            }
        }

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