<?php

namespace Espo\Custom\Hooks\CKndigung;

use Espo\Core\Hook\Hook\AfterRelate;
use Espo\Core\Hook\Hook\AfterUnrelate;
use Espo\ORM\Entity;
use Espo\ORM\Repository\Option\RelateOptions;
use Espo\ORM\Repository\Option\UnrelateOptions;

/**
 * Hook for synchronizing documents bidirectionally between Kündigung and Mietverhältnis
 * When documents are added to Kündigung, they should also be linked to the related Mietverhältnis
 */
class DocumentSync implements AfterRelate, AfterUnrelate
{
    public function __construct()
    {
    }

    /**
     * After a document is related to Kündigung, also relate it to the linked Mietverhältnis
     */
    public function afterRelate(Entity $entity, string $relationName, Entity $foreignEntity, RelateOptions $options): void
    {
        // Only process when relating documents to Kündigung
        if ($relationName !== 'dokumenteskuendigung') {
            return;
        }

        // Get the related Mietverhältnis
        $mietverhältnisList = $entity->getLinkMultipleIdList('vmhMietverhltnises');
        if (empty($mietverhältnisList)) {
            return;
        }

        // Get EntityManager from entity
        $entityManager = $entity->getEntityManager();
        
        // Link the document to the Mietverhältnis
        foreach ($mietverhältnisList as $mietverhältnisId) {
            $mietverhältnis = $entityManager->getEntityById('CVmhMietverhltnis', $mietverhältnisId);
            if (!$mietverhältnis) {
                continue;
            }

            // Link document to Mietverhältnis if not already linked
            $repository = $entityManager->getRDBRepositoryByClass('CVmhMietverhltnis');
            $isRelated = $repository->getRelation($mietverhältnis, 'dokumentesvmhMietverhltnisse')
                ->isRelatedById($foreignEntity->getId());
            
            if (!$isRelated) {
                $repository->getRelation($mietverhältnis, 'dokumentesvmhMietverhltnisse')
                    ->relateById($foreignEntity->getId());
            }
        }
    }

    /**
     * After a document is unrelated from Kündigung, optionally unrelate from Mietverhältnis
     * Note: We don't automatically unrelate from Mietverhältnis because the document might
     * have been added to Mietverhältnis independently
     */
    public function afterUnrelate(Entity $entity, string $relationName, Entity $foreignEntity, UnrelateOptions $options): void
    {
        // Only process when unrelating documents from Kündigung
        if ($relationName !== 'dokumenteskuendigung') {
            return;
        }

        // Note: We intentionally do NOT remove documents from Mietverhältnis
        // because they might have been added there independently.
        // Users must manually remove documents from Mietverhältnis if needed.
    }
}