<?php

namespace App\Repository\Blog;

use App\Core\Repository\RepositoryQuery;
use App\Entity\Blog\Category;
use Knp\Component\Pager\PaginatorInterface;

/**
 * class PostRepositoryQuery.
 *
 * @author Simon Vieille <simon@deblan.fr>
 */
class PostRepositoryQuery extends RepositoryQuery
{
    public function __construct(PostRepository $repository, PaginatorInterface $paginator)
    {
        parent::__construct($repository, 'p', $paginator);
    }

    public function inCategory(Category $category, bool $strict = true): self
    {
        $c = 'c'.mt_rand();

        if ($strict) {
            $this
                ->innerJoin('p.categories', $c)
                ->andWhere($c.'.id = :category')
                ->setParameter(':category', $category->getId())
            ;
        } else {
            $ids = [$category->getId()];

            foreach ($category->getCategories() as $childCategory) {
                $ids[] = $childCategory->getId();
            }

            $this
                ->innerJoin('p.categories', $c)
                ->andWhere($c.'.id IN (:categories)')
                ->setParameter(':categories', $ids)
            ;
        }

        return $this;
    }

    public function published(): self
    {
        return $this
            ->andWhere('.status = 1')
            ->andWhere('.publishedAt <= :now')
            ->setParameter(':now', (new \DateTime('now'))->format('Y-m-d H:i:s'))
        ;
    }

    public function search(?string $keywords, ?string $tag)
    {
        $keywords = explode(' ', $keywords);

        $filterWords = fn ($keyword) => '' !== trim($keyword) && preg_match('/[a-zA-Z]+/', $keyword);
        $keywords = array_filter($keywords, $filterWords);

        if ($keywords) {
            $conn = $this->repository->getEm()->getConnection();

            $query = $conn->prepare(
                'SELECT
                    post.id,
                    post.title,
                    post.content,
                    post.published_at
                FROM post
                WHERE
                    post.status = 1 AND
                    post.published_at < :date
            '
            );

            $statement = $query->execute([
                ':date' => (new \DateTime())->format('Y-m-d H:i:s'),
            ]);

            $results = $statement->fetchAll();
            $ids = [];
            $matches = [];

            foreach ($results as $k => $v) {
                $initWords = explode(' ', $v['title']);
                $words = [];

                foreach ($initWords as $initWord) {
                    $words = array_merge($words, preg_split('/[:_\'-]+/', $initWord));
                }

                $words = array_filter($words, $filterWords);

                foreach ($keywords as $keyword) {
                    if (str_contains(mb_strtolower($v['content']), mb_strtolower($keyword))) {
                        $similarity = 99;

                        if (isset($matches[$v['id']])) {
                            $matches[$v['id']]['similarity'] += $similarity;
                            ++$matches[$v['id']]['count'];
                        } else {
                            $matches[$v['id']] = [
                                'id' => $v['id'],
                                'title' => $v['title'],
                                'published_at' => $v['published_at'],
                                'similarity' => $similarity,
                                'count' => 1,
                            ];
                        }
                    }

                    foreach ($words as $word) {
                        if (str_contains(mb_strtolower($word), mb_strtolower($keyword))) {
                            $similarity = 150;

                            if (isset($matches[$v['id']])) {
                                $matches[$v['id']]['similarity'] += $similarity;
                                ++$matches[$v['id']]['count'];
                            } else {
                                $matches[$v['id']] = [
                                    'id' => $v['id'],
                                    'title' => $v['title'],
                                    'published_at' => $v['published_at'],
                                    'similarity' => $similarity,
                                    'count' => 1,
                                ];
                            }
                        } else {
                            $lev = levenshtein($word, $keyword);
                            $similarity = 100 - ($lev * 100 / mb_strlen($word));

                            if ($similarity > 70) {
                                if (isset($matches[$v['id']])) {
                                    $matches[$v['id']]['similarity'] += $similarity;
                                } else {
                                    $matches[$v['id']] = [
                                        'id' => $v['id'],
                                        'title' => $v['title'],
                                        'published_at' => $v['published_at'],
                                        'similarity' => $similarity,
                                        'count' => 1,
                                    ];
                                }
                            }
                        }
                    }
                }
            }

            $matches = array_filter($matches, function($match) use ($keywords) {
                return (100 * $match['count'] / count($keywords)) > 80;
            });

            usort($matches, function ($a, $b) {
                if ($a['similarity'] > $b['similarity']) {
                    return -1;
                }

                if ($b['similarity'] > $a['similarity']) {
                    return 1;
                }

                return ($a['published_at'] != $b['published_at']) * -1;
            });

            $ids = array_column($matches, 'id');

            if (!$ids) {
                $ids = [-1];
            }

            $this
                ->orderBy('FIELD(p.id, :ids)')
                ->andWhere('.id IN(:ids)')
                ->setParameter(':ids', $ids)
            ;
        }

        if ($tag) {
            $this
                ->andWhere('.tags LIKE :tag')
                ->setParameter(':tag', '%"'.$tag.'"%')
            ;
        }

        return $this;
    }

    protected function filterHandler(string $name, $value)
    {
        if ('category' === $name) {
            $this->inCategory($value);
        }
    }
}