<?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 flatActive(): array
    {
        $statement = $this->pdo()->query(
            'SELECT id, parent_id, name, slug, 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;
        }

        $childrenByParent[0] = $this->sortRootCategories($childrenByParent[0] ?? []);

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

    /**
     * @param array<int, array<string, mixed>> $categories
     * @return array<int, array<string, mixed>>
     */
    private function sortRootCategories(array $categories): array
    {
        usort($categories, function (array $left, array $right): int {
            return [
                $this->rootCategoryWeight((string) ($left['name'] ?? '')),
                (int) ($left['sort_order'] ?? 100),
                (string) ($left['name'] ?? ''),
            ] <=> [
                $this->rootCategoryWeight((string) ($right['name'] ?? '')),
                (int) ($right['sort_order'] ?? 100),
                (string) ($right['name'] ?? ''),
            ];
        });

        return $categories;
    }

    private function rootCategoryWeight(string $name): int
    {
        $lowerName = trim(mb_strtolower($name));

        return match (true) {
            str_contains($lowerName, 'рыб') => 10,
            str_contains($lowerName, 'морепроду') => 20,
            str_contains($lowerName, 'икра') => 30,
            $lowerName === 'мясо' => 40,
            str_contains($lowerName, 'сыр') => 50,
            str_contains($lowerName, 'полуфаб') => 60,
            str_contains($lowerName, 'фрукт') || str_contains($lowerName, 'овощ') || str_contains($lowerName, 'ягод') || str_contains($lowerName, 'гриб') => 70,
            str_contains($lowerName, 'бакале') => 80,
            str_contains($lowerName, 'мясная гастрономия') => 90,
            str_contains($lowerName, 'молоч') => 100,
            default => 1000,
        };
    }

    /**
     * @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;
    }

    /**
     * @return array<int, int>
     */
    public function descendantIds(int $categoryId): array
    {
        $items = $this->flatActive();
        $childrenByParent = [];

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

        $ids = [$categoryId];
        $queue = [$categoryId];

        while ($queue !== []) {
            $currentId = array_shift($queue);

            foreach ($childrenByParent[$currentId] ?? [] as $childId) {
                $ids[] = $childId;
                $queue[] = $childId;
            }
        }

        return array_values(array_unique($ids));
    }

    /**
     * @param array<string, mixed> $data
     */
    public function create(array $data): int
    {
        if (($data['name'] ?? '') === '' || ($data['slug'] ?? '') === '') {
            throw new \InvalidArgumentException('Название и slug обязательны.');
        }

        $statement = $this->pdo()->prepare(
            'INSERT INTO categories
                (parent_id, name, slug, h1, seo_title, seo_description, seo_keywords, sort_order, is_active)
             VALUES
                (:parent_id, :name, :slug, :h1, :seo_title, :seo_description, :seo_keywords, :sort_order, :is_active)'
        );

        $statement->execute([
            'parent_id' => $data['parent_id'],
            'name' => $data['name'],
            'slug' => $data['slug'],
            'h1' => $data['h1'] ?: null,
            'seo_title' => $data['seo_title'] ?: null,
            'seo_description' => $data['seo_description'] ?: null,
            'seo_keywords' => $data['seo_keywords'] ?: null,
            'sort_order' => $data['sort_order'] ?? 100,
            'is_active' => $data['is_active'] ?? 1,
        ]);

        return (int) $this->pdo()->lastInsertId();
    }
}