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

    # Allow large drawing data + body size
    client_max_body_size 50m;

    # PWA service worker — MUST not be cached by browser/proxy
    location = /sw.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Service-Worker-Allowed "/";
        add_header Content-Type "application/javascript";
        try_files $uri =404;
    }

    # PWA manifest
    location = /manifest.json {
        add_header Cache-Control "public, max-age=3600";
        add_header Content-Type "application/manifest+json";
        try_files $uri =404;
    }

    # Static assets — long cache with content hash from Vite
    location /assets/ {
        add_header Cache-Control "public, max-age=31536000, immutable";
        try_files $uri =404;
    }

    # Icons
    location ~* ^/icon-.*\.png$ {
        add_header Cache-Control "public, max-age=86400";
        try_files $uri =404;
    }

    # SPA fallback — all other routes serve index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # API proxy
    location /api/ {
        proxy_pass http://inknote-server:4000;
        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;
        proxy_connect_timeout 10;
        proxy_send_timeout 60;
        proxy_read_timeout 60;
    }

    # WebSocket proxy
    location /ws {
        proxy_pass http://inknote-server:4000;
        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_read_timeout 86400;
    }
}