server {
    listen 80;
    server_name localhost;
    client_max_body_size 50M;

    # Security headers (TLS/HSTS at NPM — see docs/deployment/npm-security.md)
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(self), geolocation=(self), microphone=(self)" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'${PLAUSIBLE_CSP}; connect-src 'self'${PLAUSIBLE_CSP}; img-src 'self' data: blob: https://*.tile.openstreetmap.org; media-src 'self' blob: data:; style-src 'self' 'unsafe-inline'; font-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self';" always;

    # Service worker and app shell must revalidate so PWA updates are detected
    location ~* ^/(sw\.js|workbox-.*\.js|manifest\.webmanifest|version\.json)$ {
        root /usr/share/nginx/html;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
        add_header Permissions-Policy "camera=(self), geolocation=(self), microphone=(self)" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self'${PLAUSIBLE_CSP}; connect-src 'self'${PLAUSIBLE_CSP}; img-src 'self' data: blob: https://*.tile.openstreetmap.org; media-src 'self' blob: data:; style-src 'self' 'unsafe-inline'; font-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self';" always;
    }

    location = /index.html {
        root /usr/share/nginx/html;
        add_header Cache-Control "no-cache, must-revalidate" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
        add_header Permissions-Policy "camera=(self), geolocation=(self), microphone=(self)" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self'${PLAUSIBLE_CSP}; connect-src 'self'${PLAUSIBLE_CSP}; img-src 'self' data: blob: https://*.tile.openstreetmap.org; media-src 'self' blob: data:; style-src 'self' 'unsafe-inline'; font-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self';" always;
    }

    location / {
        root /usr/share/nginx/html;
        index index.html index.htm;
        try_files $uri $uri/ /index.html;
    }

    location /api/ {
        proxy_pass http://backend:5000/api/;
        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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_cache_bypass $http_upgrade;
    }
}
