<?php

namespace App\Service;

use App\Entity\Employee;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

/**
 * Erzeugt eine vCard (RFC 6350, Version 3.0 – breite Kompatibilität mit
 * iOS, Android, Outlook) aus einem Mitarbeiterprofil.
 */
final class VCardBuilder
{
    public function __construct(private readonly UrlGeneratorInterface $urls)
    {
    }

    public function build(Employee $e): string
    {
        $company = $e->getCompany();

        $lines = [];
        $lines[] = 'BEGIN:VCARD';
        $lines[] = 'VERSION:3.0';
        // N: Nachname;Vorname;;Präfix(Titel);
        $lines[] = 'N:'.$this->esc($e->getLastName()).';'.$this->esc($e->getFirstName()).';;'
            .$this->esc((string) $e->getTitle()).';';
        $lines[] = 'FN:'.$this->esc(trim(($e->getTitle() ? $e->getTitle().' ' : '').$e->getFirstName().' '.$e->getLastName()));

        if ($company) {
            // ORG:Firma;Abteilung
            $org = $this->esc($company->getName());
            if ($e->getDepartment()) {
                $org .= ';'.$this->esc($e->getDepartment());
            }
            $lines[] = 'ORG:'.$org;
        }
        if ($e->getPosition()) {
            $lines[] = 'TITLE:'.$this->esc($e->getPosition());
        }

        if ($e->getEmail()) {
            $lines[] = 'EMAIL;TYPE=WORK:'.$this->esc($e->getEmail());
        }
        if ($e->getEmailPrivate()) {
            $lines[] = 'EMAIL;TYPE=HOME:'.$this->esc($e->getEmailPrivate());
        }

        if ($e->getPhone()) {
            $lines[] = 'TEL;TYPE=WORK,VOICE:'.$this->esc($e->getPhone());
        }
        if ($e->getMobile()) {
            $lines[] = 'TEL;TYPE=CELL:'.$this->esc($e->getMobile());
        }
        if ($e->getPhoneCentral()) {
            $lines[] = 'TEL;TYPE=WORK:'.$this->esc($e->getPhoneCentral());
        }
        if ($e->getFax()) {
            $lines[] = 'TEL;TYPE=WORK,FAX:'.$this->esc($e->getFax());
        }

        if ($e->getWebsite()) {
            $lines[] = 'URL:'.$this->esc($e->getWebsite());
        }

        $this->addAddress($lines, 'WORK', $e->getAddressBusiness() ?? $this->fromLocation($e));
        $this->addAddress($lines, 'HOME', $e->getAddressPrivate());

        foreach ($e->getContactLinks() as $link) {
            $lines[] = 'URL:'.$this->esc($link->getUrl());
        }

        if (null !== $e->getPhotoPath()) {
            $lines[] = 'PHOTO;VALUE=URI:'.$this->urls->generate(
                'employee_photo_public',
                ['id' => (string) $e->getId()],
                UrlGeneratorInterface::ABSOLUTE_URL,
            );
        }

        if ($e->getBio()) {
            $lines[] = 'NOTE:'.$this->esc($e->getBio());
        }

        $lines[] = 'REV:'.$e->getUpdatedAt()->format('Ymd\THis\Z');
        $lines[] = 'END:VCARD';

        // vCard verlangt CRLF-Zeilenenden
        return implode("\r\n", $lines)."\r\n";
    }

    /**
     * @param string[]                  $lines
     * @param array<string, mixed>|null $a
     */
    private function addAddress(array &$lines, string $type, ?array $a): void
    {
        if (null === $a) {
            return;
        }
        $street = trim((string) ($a['street'] ?? '').' '.(string) ($a['houseNumber'] ?? ''));
        $city = (string) ($a['city'] ?? '');
        if ('' === $street && '' === $city) {
            return;
        }
        // ADR: PO;Ext;Straße;Ort;Region;PLZ;Land
        $lines[] = 'ADR;TYPE='.$type.':;'
            .$this->esc((string) ($a['addressLine2'] ?? '')).';'
            .$this->esc($street).';'
            .$this->esc($city).';'
            .$this->esc((string) ($a['state'] ?? '')).';'
            .$this->esc((string) ($a['zip'] ?? '')).';'
            .$this->esc((string) ($a['country'] ?? ''));
    }

    /**
     * Fallback: Geschäftsadresse aus dem zugeordneten Standort.
     *
     * @return array<string, mixed>|null
     */
    private function fromLocation(Employee $e): ?array
    {
        $l = $e->getLocation();
        if (null === $l || (!$l->getStreet() && !$l->getCity())) {
            return null;
        }

        return [
            'street' => (string) $l->getStreet(),
            'city' => (string) $l->getCity(),
            'zip' => (string) $l->getPostalCode(),
            'country' => (string) $l->getCountry(),
        ];
    }

    /** Escaping gemäß vCard-Spezifikation. */
    private function esc(string $value): string
    {
        return str_replace(
            ['\\', "\n", ',', ';'],
            ['\\\\', '\\n', '\\,', '\\;'],
            $value,
        );
    }
}