server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Use Docker's internal DNS resolver with short cache
    resolver 127.0.0.11 valid=10s ipv6=off;

    # SPA routing
    location / {
        try_files $uri $uri/ /index.html;
    }

    # API proxy to gateway
    location /api/v1/ {
        set $upstream_gateway gateway;
        proxy_pass http://$upstream_gateway:8088;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # WebSocket proxy (client connects to /api/socket, gateway listens on /api/v1/socket)
    location /api/socket {
        set $upstream_gateway gateway;
        proxy_pass http://$upstream_gateway:8088/api/v1/socket;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_read_timeout 86400;
    }

    # WebSocket proxy (direct v1 path)
    location /api/v1/socket {
        set $upstream_gateway gateway;
        proxy_pass http://$upstream_gateway:8088;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_read_timeout 86400;
    }
}