<?php

namespace App\Http\Controllers;

use App\Catalog\ProductCard;
use App\Models\StoicPage;
use Modules\Core\Catalog\DTOs\ProductFilters;
use Modules\Core\Catalog\Services\CollectionService;
use Modules\Core\Catalog\Services\ProductService;

class HomeController extends Controller
{
    /** Slug of the hero collection in the "Homepage" collection group. */
    private const HERO_COLLECTION_SLUG = 'hero';

    private const HERO_FALLBACK_COUNT = 5;

    private const CLASSICS_COUNT = 8;

    public function __construct(
        private readonly ProductService $products,
        private readonly CollectionService $collections,
    ) {}

    public function index(string $locale)
    {
        $page = StoicPage::localized('home');

        if (! $page) {
            abort(404);
        }

        // Random pool for the classics carousel, and for the hero too when the
        // hero collection is missing or empty. Oversized so hero products can be
        // excluded from it and still leave enough.
        $random = collect($this->products->random(self::HERO_FALLBACK_COUNT + self::CLASSICS_COUNT));

        $hero = collect($this->heroCollectionProducts());

        if ($hero->isEmpty()) {
            $hero = $random->take(self::HERO_FALLBACK_COUNT);
        }

        $heroIds = $hero->pluck('id')->all();

        $classics = $random
            ->reject(fn (array $product) => in_array($product['id'], $heroIds))
            ->take(self::CLASSICS_COUNT);

        return view('home', [
            'page' => $page,
            'heroProducts' => $hero->map(fn (array $product) => ProductCard::fromIndexed($product))->values(),
            'classicsProducts' => $classics->map(fn (array $product) => ProductCard::fromIndexed($product))->values(),
        ]);
    }

    /**
     * Products the store owner picked for the hero, via the Lunar collection
     * with slug "hero". Not in the owner's drag order yet: the product index
     * doesn't carry per-collection position (pending a boboko-core task).
     */
    private function heroCollectionProducts(): array
    {
        $collection = $this->collections->getBySlug(self::HERO_COLLECTION_SLUG);

        if ($collection === null) {
            return [];
        }

        return $this->products
            ->list(new ProductFilters(collectionId: $collection['id']))
            ->products
            ->items();
    }
}