<?php

namespace App\Http\Controllers\Web;

use App\Http\Controllers\Controller;
use App\Http\Middleware\SetEdition;
use App\Models\PressRelease;
use App\Scopes\PortalScope;
use App\Services\PressRelease\CanonicalAssigner;
use App\Support\StructuredData;
use App\Support\WebPortalContext;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Cache;

/**
 * Google-News-Sitemap je Spoke (Roadmap 2.2): nur Meldungen der letzten
 * 48 Stunden, höchstens 1.000, mit Publikationsname und Sprache — so wie
 * Google News sie verlangt. Der Hub (pressekonto) hat keine Meldungen und
 * liefert eine leere Liste. Kurz gecacht (15 min), damit neue Meldungen
 * schnell erscheinen; Entfernungen leeren den Cache über WebCaches.
 */
class NewsSitemapController extends Controller
{
    public const CACHE_TTL_SECONDS = 900;

    public const WINDOW_HOURS = 48;

    public const MAX_URLS = 1000;

    public function __invoke(Request $request): Response
    {
        $host = $request->getHost();
        $base = rtrim($request->getSchemeAndHttpHost(), '/');
        $isHub = str_contains($host, 'pressekonto');

        $xml = Cache::remember('web.sitemap-news.'.$host, self::CACHE_TTL_SECONDS, function () use ($base, $isHub): string {
            $entries = $isHub ? [] : $this->entries($base);

            return view('web.sitemap-news', ['entries' => $entries])->render();
        });

        return response($xml, 200, ['Content-Type' => 'application/xml; charset=UTF-8']);
    }

    /**
     * @return list<array{loc: string, publication: string, language: string, published_at: string, title: string}>
     */
    private function entries(string $base): array
    {
        $context = WebPortalContext::fromRequest();
        $publication = (string) StructuredData::publisher($base)['name'];

        // Bei Doppelveröffentlichung nur die Erstquelle (Anhang 2, 1c.8) —
        // Google News spielt ohnehin nur eine Fassung aus.
        $assigner = app(CanonicalAssigner::class);
        $releases = PressRelease::query()
            ->withoutGlobalScope(PortalScope::class)
            ->visibleInArchive()
            ->forPortalValues($context->portalValues)
            ->when($assigner->enabled(), fn ($query) => $query->whereNull('canonical_press_release_id'))
            ->where('published_at', '>=', now()->subHours(self::WINDOW_HOURS))
            ->orderByDesc('published_at')
            ->limit(self::MAX_URLS)
            ->get(['id', 'slug', 'title', 'portal', 'language', 'category_id', 'canonical_press_release_id', 'published_at']);

        $entries = [];

        foreach ($releases as $release) {
            if (! $assigner->isCanonicalOn($release, $context->portal)) {
                continue;
            }

            $edition = in_array($release->language, SetEdition::EDITIONS, true) ? $release->language : SetEdition::DEFAULT_EDITION;

            $entries[] = [
                'loc' => $base.'/'.$edition.'/press-release/'.$release->slug,
                'publication' => $publication,
                'language' => $edition,
                'published_at' => (string) $release->published_at?->toAtomString(),
                'title' => (string) $release->title,
            ];
        }

        return $entries;
    }
}