<?php

namespace Infrastructure\Persistence;

use Infrastructure\Config\DatabaseFactory;

class DokumentationRepository
{
    private \PDO $pdo;

    public function __construct()
    {
        $this->pdo = DatabaseFactory::dev();
    }

    public function findById(int $id): ?array
    {
        $stmt = $this->pdo->prepare('SELECT * FROM dokumentation WHERE id = :id');
        $stmt->execute(['id' => $id]);
        $result = $stmt->fetch();

        return $result !== false ? $result : null;
    }

    public function findByPath(string $path): ?array
    {
        $stmt = $this->pdo->prepare('SELECT * FROM dokumentation WHERE path = :path AND status = :status');
        $stmt->execute(['path' => $path, 'status' => 'published']);
        $result = $stmt->fetch();

        return $result !== false ? $result : null;
    }

    public function findBySlug(string $slug, ?int $parentId = null): ?array
    {
        if ($parentId === null) {
            $stmt = $this->pdo->prepare('SELECT * FROM dokumentation WHERE slug = :slug AND parent_id IS NULL AND status = :status');
            $stmt->execute(['slug' => $slug, 'status' => 'published']);
        } else {
            $stmt = $this->pdo->prepare('SELECT * FROM dokumentation WHERE slug = :slug AND parent_id = :parent_id AND status = :status');
            $stmt->execute(['slug' => $slug, 'parent_id' => $parentId, 'status' => 'published']);
        }
        $result = $stmt->fetch();

        return $result !== false ? $result : null;
    }

    public function findDocBySlug(string $slug): ?array
    {
        $stmt = $this->pdo->prepare('SELECT * FROM dokumentation WHERE slug = :slug AND status = :status LIMIT 1');
        $stmt->execute(['slug' => $slug, 'status' => 'published']);
        $result = $stmt->fetch();

        return $result !== false ? $result : null;
    }

    public function findChildren(int $parentId): array
    {
        $stmt = $this->pdo->prepare('
            SELECT * FROM dokumentation
            WHERE parent_id = :parent_id AND status = :status
            ORDER BY sort_order ASC
        ');
        $stmt->execute(['parent_id' => $parentId, 'status' => 'published']);

        return $stmt->fetchAll();
    }

    public function findRootDocuments(): array
    {
        $stmt = $this->pdo->prepare('
            SELECT * FROM dokumentation
            WHERE parent_id IS NULL AND status = :status
            ORDER BY sort_order ASC
        ');
        $stmt->execute(['status' => 'published']);

        return $stmt->fetchAll();
    }

    public function getHierarchy(): array
    {
        $roots = $this->findRootDocuments();

        return $this->buildTree($roots);
    }

    private function buildTree(array $items): array
    {
        $result = [];
        foreach ($items as $item) {
            $children = $this->findChildren((int) $item['id']);
            $item['children'] = $this->buildTree($children);
            $result[] = $item;
        }

        return $result;
    }

    public function getBreadcrumb(int $docId): array
    {
        $breadcrumb = [];
        $doc = $this->findById($docId);

        while ($doc !== null) {
            array_unshift($breadcrumb, [
                'title' => $doc['title'],
                'path' => $doc['path'],
            ]);

            if ($doc['parent_id'] !== null) {
                $doc = $this->findById((int) $doc['parent_id']);
            } else {
                $doc = null;
            }
        }

        return $breadcrumb;
    }

    public function getSiblings(int $docId): array
    {
        $doc = $this->findById($docId);
        if ($doc === null) {
            return [];
        }

        if ($doc['parent_id'] === null) {
            return $this->findRootDocuments();
        }

        return $this->findChildren((int) $doc['parent_id']);
    }

    public function getStatistics(): array
    {
        $stats = [];

        $stmt = $this->pdo->query('SELECT COUNT(*) FROM dokumentation');
        $stats['total'] = (int) $stmt->fetchColumn();

        $stmt = $this->pdo->query('SELECT depth, COUNT(*) as count FROM dokumentation GROUP BY depth ORDER BY depth');
        $stats['by_depth'] = $stmt->fetchAll();

        $stmt = $this->pdo->query('SELECT status, COUNT(*) as count FROM dokumentation GROUP BY status');
        $stats['by_status'] = $stmt->fetchAll();

        return $stats;
    }
}