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<?php
namespace App\Http\Controllers;
use App\Models\Material;
use App\Models\Pathway;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Cache;
/**
* Discovery helpers for search engines and AI agents:
* GET /sitemap.xml — standard sitemaps.org index of crawlable URLs
* GET /llms.txt — Anthropic-proposed plain-text index for LLM crawlers
* (see https://llmstxt.org/)
*/
class DiscoveryController extends Controller
{
public function sitemap(): Response
{
$xml = Cache::remember('sitemap.xml', now()->addHour(), function () {
$urls = [];
// Static hubs
$urls[] = ['loc' => url('/materials'), 'changefreq' => 'daily', 'priority' => '1.0'];
$urls[] = ['loc' => url('/pathways'), 'changefreq' => 'weekly', 'priority' => '0.8'];
$urls[] = ['loc' => url('/graph'), 'changefreq' => 'weekly', 'priority' => '0.6'];
$urls[] = ['loc' => url('/similarity-map'), 'changefreq' => 'weekly', 'priority' => '0.6'];
// Every published material
Material::published()
->select('id', 'updated_at')
->orderBy('id')
->chunk(500, function ($materials) use (&$urls) {
foreach ($materials as $m) {
$urls[] = [
'loc' => url('/materials/' . $m->id),
'lastmod' => $m->updated_at?->toAtomString(),
'changefreq' => 'monthly',
'priority' => '0.7',
];
}
});
// Every published pathway + its explore view
Pathway::where('status', 'published')
->select('slug', 'updated_at')
->orderBy('id')
->get()
->each(function ($p) use (&$urls) {
$urls[] = [
'loc' => url('/pathways/' . $p->slug),
'lastmod' => $p->updated_at?->toAtomString(),
'changefreq' => 'monthly',
'priority' => '0.6',
];
$urls[] = [
'loc' => url('/pathways/' . $p->slug . '/explore'),
'lastmod' => $p->updated_at?->toAtomString(),
'changefreq' => 'monthly',
'priority' => '0.5',
];
});
// Build the XML
$xml = '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
$xml .= '<urlset xmlns="http://www.sitemaps.org/schemas/0.9">' . "\n";
foreach ($urls as $u) {
$xml .= " <url>\n";
$xml .= ' <loc>' . htmlspecialchars($u['loc'], ENT_XML1) . "</loc>\n";
if (!empty($u['lastmod'])) {
$xml .= ' <lastmod>' . $u['lastmod'] . "</lastmod>\n";
}
$xml .= ' <changefreq>' . $u['changefreq'] . "</changefreq>\n";
$xml .= ' <priority>' . $u['priority'] . "</priority>\n";
$xml .= " </url>\n";
}
$xml .= '</urlset>' . "\n";
return $xml;
});
return response($xml, 200, ['Content-Type' => 'application/xml; charset=UTF-8']);
}
public function llmsTxt(): Response
{
$text = Cache::remember('llms.txt', now()->addHour(), function () {
$lines = [];
$lines[] = '# Futures Literacy Navigator';
$lines[] = '';
$lines[] = '> A curated knowledge base for futures literacy, strategic foresight and anticipation.';
$lines[] = '';
$lines[] = 'This file lists what the site contains as a signposting index — titles, authors and URLs only. **Summaries and full content are available on the individual material pages.** Please link to those pages directly rather than reproducing their content.';
$lines[] = '';
$lines[] = 'Sister projects: [Futures Glossary](https://futuresglossary.net) · [zukuenfte.net](https://zukuenfte.net).';
$lines[] = '';
$lines[] = '## Browse';
$lines[] = '';
$lines[] = '- [All materials](' . url('/materials') . ') — filterable by language, level, focus, format, cost';
$lines[] = '- [Learning pathways](' . url('/pathways') . ') — curated step-by-step journeys';
$lines[] = '- [Knowledge graph](' . url('/graph') . ') — 3D visualisation of materials and their tag relationships';
$lines[] = '- [Similarity map](' . url('/similarity-map') . ') — 2D map of materials clustered by shared tags';
$lines[] = '';
$lines[] = '## Materials';
$lines[] = '';
Material::published()
->orderBy('id', 'desc')
->limit(300)
->get(['id', 'title', 'author'])
->each(function ($m) use (&$lines) {
$byline = $m->author ? ' — ' . $m->author : '';
$lines[] = '- [' . trim($m->title) . '](' . url('/materials/' . $m->id) . ')' . $byline;
});
$lines[] = '';
$lines[] = '## Pathways';
$lines[] = '';
Pathway::where('status', 'published')
->orderBy('id')
->get(['slug', 'title'])
->each(function ($p) use (&$lines) {
$lines[] = '- [' . $p->title . '](' . url('/pathways/' . $p->slug) . ')';
});
$lines[] = '';
$lines[] = '## Sister sites';
$lines[] = '';
$lines[] = '- [futuresglossary.net](https://futuresglossary.net) — collaborative multilingual glossary of futures-studies terms';
$lines[] = '- [zukuenfte.net](https://zukuenfte.net) — German-language futures literacy initiative';
return implode("\n", $lines) . "\n";
});
return response($text, 200, ['Content-Type' => 'text/plain; charset=UTF-8']);
}
}