server {
    listen 80;
    server_name localhost;

    root /usr/share/nginx/html;
    index index.html;

    # Support /kifi/ subpath if forwarded with prefix by reverse proxy
    rewrite ^/kifi/(.*)$ /$1 break;
    rewrite ^/kifi$ / break;

    # Gzip compression for Flutter Web assets (JS, WASM, CSS, JSON, Fonts)
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_types
        text/plain
        text/css
        text/javascript
        application/javascript
        application/json
        application/x-javascript
        application/wasm
        image/svg+xml
        font/woff
        font/woff2;

    # Service Worker & manifest: no cache to ensure immediate updates
    location ~* (flutter_service_worker\.js|manifest\.json|version\.json)$ {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
        try_files $uri =404;
    }

    # Static assets (images, fonts, canvaskit, icons, js chunks): long cache
    location ~* \.(?:ico|png|jpg|jpeg|gif|svg|woff|woff2|ttf|eot|wasm)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # Main SPA routing: fall back to index.html for all subroutes
    location / {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        try_files $uri $uri/ /index.html;
    }

    # Error pages
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}