'use client';

/**
 * Fires `place_viewed` once per location page.
 *
 * A separate client component because PlaceView is a server component and
 * cannot call into the browser. It renders nothing — its whole job is the
 * effect, which keeps the page itself server-rendered.
 *
 * Umami already counts a pageview for every one of these URLs, so this is not
 * about traffic. It is about `kind`: whether to keep investing in the location
 * layer turns on which *sort* of page earns engagement — towns, authorities,
 * London localities or postcode districts — and a pageview cannot say, because
 * all four families share the /schools/ prefix and only the registry knows
 * which is which.
 */

import { useEffect } from 'react';
import { track, getNavigationSource } from '@/lib/analytics';

interface Props {
  kind: string;
  slug: string;
  count: number;
  phase?: 'primary' | 'secondary';
}

export function TrackPlaceView({ kind, slug, count, phase }: Props) {
  useEffect(() => {
    track('place_viewed', {
      kind,
      slug,
      // "all" rather than omitting it, so the unphased page is a value in the
      // same field rather than a gap that has to be interpreted.
      phase: phase ?? 'all',
      school_count: count,
      // Internal navigation only. An arrival from Google reads as 'direct'
      // here; Umami's own pageview referrer is where external attribution
      // lives, and these pages exist to be arrived at externally.
      from: getNavigationSource(),
    });
  // Once per place, not once per render.
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [kind, slug, phase]);

  return null;
}