server {
    listen 80;
    server_name _;

    include /etc/nginx/mime.types;
    types {
        application/javascript mjs;
        application/wasm wasm;
    }

    # Match MAX_UPLOAD_MB — raise in both this and the outer reverse proxy
    client_max_body_size 200m;

    # Security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' blob: 'wasm-unsafe-eval'; worker-src 'self' blob:; style-src 'self' 'unsafe-inline'; img-src 'self' blob: data:; font-src 'self' data:; connect-src 'self';" always;

    # SPA: serve index.html for all non-file routes (history API fallback)
    root /usr/share/nginx/html;
    index index.html;

    location / {
        try_files $uri $uri/ /index.html;
    }

    # Proxy /api/ to the backend container
    location /api/ {
        proxy_pass http://backend:8000;
        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;

        # Pass through auth cookies and CSRF header
        proxy_pass_header Set-Cookie;
        proxy_set_header Cookie $http_cookie;
        proxy_set_header X-Requested-With $http_x_requested_with;

        # Timeouts for large uploads/exports
        proxy_connect_timeout 60s;
        proxy_send_timeout 120s;
        proxy_read_timeout 120s;

        # Upload size (must match client_max_body_size)
        client_max_body_size 200m;
    }

    # Cache static assets
    location ~* \.(js|mjs|wasm|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # Disable access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
}