<?php

declare(strict_types=1);

namespace App\Repositories;

final class CategoryRepository extends BaseRepository
{
    /**
     * @return array<int, array<string, mixed>>
     */
    public function active(): array
    {
        $statement = $this->pdo()->query(
            'SELECT id, parent_id, name, slug, legacy_path, h1, seo_title, seo_description, seo_keywords, image_path, sort_order
             FROM categories
             WHERE is_active = 1
             ORDER BY parent_id IS NOT NULL, sort_order, name'
        );

        return $statement->fetchAll();
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public function tree(): array
    {
        $items = $this->active();
        $childrenByParent = [];

        foreach ($items as $item) {
            $parentKey = $item['parent_id'] === null ? 0 : (int) $item['parent_id'];
            $childrenByParent[$parentKey][] = $item;
        }

        return $this->buildTree($childrenByParent, 0);
    }

    /**
     * @param array<int, array<int, array<string, mixed>>> $childrenByParent
     * @return array<int, array<string, mixed>>
     */
    private function buildTree(array $childrenByParent, int $parentId): array
    {
        $branch = [];

        foreach ($childrenByParent[$parentId] ?? [] as $item) {
            $item['children'] = $this->buildTree($childrenByParent, (int) $item['id']);
            $branch[] = $item;
        }

        return $branch;
    }

    /**
     * @return array<string, mixed>|null
     */
    public function findBySlug(string $slug): ?array
    {
        $statement = $this->pdo()->prepare(
            'SELECT id, parent_id, name, slug, legacy_path, description, h1, seo_title, seo_description, seo_keywords, image_path
             FROM categories
             WHERE slug = :slug AND is_active = 1
             LIMIT 1'
        );
        $statement->execute(['slug' => $slug]);
        $category = $statement->fetch();

        return $category ?: null;
    }

    /**
     * @return array<int, array<string, string>>
     */
    public function breadcrumbs(int $categoryId): array
    {
        $items = [];
        $currentId = $categoryId;

        while ($currentId > 0) {
            $statement = $this->pdo()->prepare(
                'SELECT id, parent_id, name, slug
                 FROM categories
                 WHERE id = :id
                 LIMIT 1'
            );
            $statement->execute(['id' => $currentId]);
            $category = $statement->fetch();

            if (!$category) {
                break;
            }

            array_unshift($items, [
                'title' => $category['name'],
                'url' => '/catalog/' . $category['slug'],
            ]);

            $currentId = $category['parent_id'] === null ? 0 : (int) $category['parent_id'];
        }

        array_unshift($items, [
            'title' => 'Главная',
            'url' => '/',
        ]);

        return $items;
    }
}