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

    # Redirect root to Spanish
    location = / {
        return 301 /es/;
    }

    # Proxy API calls to the backend service
    # Exact match on /api — avoids the 301 redirect nginx emits for
    # location /api/ when the client posts to bare /api (POST→GET on 301)
    location = /api {
        proxy_pass http://backend:5000/;
        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;
    }

    # Rewrite /{lang}/result/{id} to /{lang}/result/id/index.html
    location ~ ^/([^/]+)/result/[^/]+/?$ {
        set $lang $1;
        try_files /$lang/result/id/index.html =404;
    }

    # Rewrite /result/{id} to /es/result/id/index.html
    location ~ ^/result/[^/]+/?$ {
        try_files /es/result/id/index.html =404;
    }

    location / {
        try_files $uri $uri/ =404;
    }
}