<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Core\Database;
use App\Repositories\CategoryRepository;
use App\Repositories\ProductRepository;
use App\Repositories\SettingRepository;
use Throwable;

final class HomeController
{
    public function index(): void
    {
        $dbStatus = 'not_checked';
        $categories = [];
        $catalogProducts = [];
        $popularProducts = [];
        $homeCatalogSections = [];
        $settings = [];
        $notice = null;

        try {
            Database::pdo()->query('SELECT 1');
            $dbStatus = 'connected';

            $categoryRepository = new CategoryRepository();
            $categories = $categoryRepository->tree();
            $productRepository = new ProductRepository();
            $catalogProducts = $productRepository->catalogPreview(24);
            $popularProducts = $productRepository->popularPreview(10);
            $homeCatalogSections[] = [
                'key' => 'promos',
                'title' => 'Акции',
                'url' => '/promo',
                'count' => 50,
                'kind' => 'promo',
                'products' => $productRepository->promoPreview(10),
            ];
            $homeCatalogSections[] = [
                'key' => 'new',
                'title' => 'Новинки',
                'url' => '/new',
                'count' => 50,
                'kind' => 'new',
                'products' => $productRepository->newPreview(10),
            ];
            $settings = (new SettingRepository())->allKeyed();
        } catch (Throwable $exception) {
            $dbStatus = app_env('APP_DEBUG', 'false') === 'true'
                ? 'error: ' . $exception->getMessage()
                : 'error';
            $notice = 'Если таблицы еще не созданы, откройте страницу установки базы.';
        }

        view('pages/home', [
            'title' => 'Рыбсток - качественные продукты по стоковым ценам с доставкой',
            'metaDescription' => 'Рыбсток - интернет-склад качественной рыбы, морепродуктов, мяса, сыров, овощей, ягод и бакалеи по стоковым ценам. Бесплатная доставка по Москве и Московской области, самовывоз с ул. Привольная.',
            'metaKeywords' => 'Рыбсток, рыба доставка Москва, морепродукты доставка Москва, мясо доставка Москва, сыры доставка, икра доставка Москва, овощи ягоды заморозка, бакалея с доставкой, продукты по стоковым ценам, интернет склад продуктов, бесплатная доставка продуктов Москва, доставка продуктов Московская область',
            'breadcrumbs' => [
                ['title' => 'Главная'],
            ],
            'showBackButton' => false,
            'dbStatus' => $dbStatus,
            'categories' => $categories,
            'catalogProducts' => $catalogProducts,
            'popularProducts' => $popularProducts,
            'homeCatalogSections' => $homeCatalogSections,
            'settings' => $settings,
            'notice' => $notice,
            'buildVersion' => '2026-06-04-02',
        ]);
    }

    /**
     * @param array<int, array<string, mixed>> $categoryTree
     * @param array<int, string> $slugs
     * @return array{category: array<string, mixed>, showcase: array{products: array<int, array<string, mixed>>, total: int}}|null
     */
    private function homeCategoryShowcase(
        CategoryRepository $categoryRepository,
        ProductRepository $productRepository,
        array $categoryTree,
        array $slugs,
        string $title
    ): ?array {
        $candidates = [];
        $seenIds = [];

        foreach ($slugs as $slug) {
            $category = $categoryRepository->findBySlug($slug);
            if ($category !== null) {
                $categoryId = (int) $category['id'];
                $seenIds[$categoryId] = true;
                $candidates[] = $category;
            }
        }

        foreach ($this->findCategoriesByName($categoryTree, $title) as $category) {
            $categoryId = (int) $category['id'];
            if (isset($seenIds[$categoryId])) {
                continue;
            }

            $seenIds[$categoryId] = true;
            $candidates[] = $category;
        }

        $fallback = null;
        foreach ($candidates as $category) {
            $showcase = $productRepository->categoryRetailShowcase((int) $category['id'], 10);
            $match = [
                'category' => $category,
                'showcase' => $showcase,
            ];

            if ($showcase['products'] !== []) {
                return $match;
            }

            $fallback ??= $match;
        }

        return $fallback;
    }

    /**
     * @param array<int, array<string, mixed>> $categories
     * @return array<int, array<string, mixed>>
     */
    private function findCategoriesByName(array $categories, string $name): array
    {
        $matches = [];
        $normalizedName = $this->normalizeCategoryName($name);

        foreach ($categories as $category) {
            if ($this->normalizeCategoryName((string) ($category['name'] ?? '')) === $normalizedName) {
                $matches[] = $category;
            }

            $matches = array_merge(
                $matches,
                $this->findCategoriesByName($category['children'] ?? [], $name)
            );
        }

        return $matches;
    }

    private function normalizeCategoryName(string $name): string
    {
        return trim(str_replace('ё', 'е', mb_strtolower($name)));
    }
}