server {
    listen 80;
    server_name _;

    # Gzip compression for API responses and static assets
    gzip on;
    gzip_types application/json text/plain text/css application/javascript;
    gzip_min_length 1000;
    gzip_comp_level 6;

    # 前端静态文件
    location / {
        root /usr/share/nginx/html;
        index index.html;
        try_files $uri $uri/ /index.html;

        # Cache static assets
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf)$ {
            expires 7d;
            add_header Cache-Control "public, max-age=604800, immutable";
        }
    }

    # Health check (no proxy)
    location /ping {
        resolver 127.0.0.11 valid=10s ipv6=off;
        set $api_upstream http://api:8080;
        proxy_pass $api_upstream;
        proxy_connect_timeout 5s;
        proxy_read_timeout 5s;
    }

    # API 代理（含 WebSocket）
    location /api/ {
        resolver 127.0.0.11 valid=10s ipv6=off;
        set $api_upstream http://api:8080;
        proxy_pass $api_upstream;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        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_read_timeout 300s;
        proxy_send_timeout 300s;

        # Larger buffer for big API responses
        proxy_buffer_size 16k;
        proxy_buffers 8 32k;

        # No caching for API
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }
}