<?php

namespace App\Service;

use App\Entity\Employee;

/**
 * Erzeugt eine vCard (RFC 6350, Version 3.0 – breite Kompatibilität mit
 * iOS, Android, Outlook) aus einem Mitarbeiterprofil.
 */
final class VCardBuilder
{
    public function build(Employee $e): string
    {
        $company = $e->getCompany();
        $location = $e->getLocation();

        $lines = [];
        $lines[] = 'BEGIN:VCARD';
        $lines[] = 'VERSION:3.0';
        $lines[] = 'N:'.$this->esc($e->getLastName()).';'.$this->esc($e->getFirstName()).';;;';
        $lines[] = 'FN:'.$this->esc(trim($e->getFirstName().' '.$e->getLastName()));

        if ($company) {
            $lines[] = 'ORG:'.$this->esc($company->getName());
        }
        if ($e->getPosition()) {
            $lines[] = 'TITLE:'.$this->esc($e->getPosition());
        }
        if ($e->getEmail()) {
            $lines[] = 'EMAIL;TYPE=WORK:'.$this->esc($e->getEmail());
        }
        if ($e->getPhone()) {
            $lines[] = 'TEL;TYPE=WORK,VOICE:'.$this->esc($e->getPhone());
        }
        if ($e->getMobile()) {
            $lines[] = 'TEL;TYPE=CELL:'.$this->esc($e->getMobile());
        }

        if ($location && ($location->getStreet() || $location->getCity())) {
            // ADR: ;;Straße;Ort;;PLZ;Land
            $lines[] = 'ADR;TYPE=WORK:;;'
                .$this->esc((string) $location->getStreet()).';'
                .$this->esc((string) $location->getCity()).';;'
                .$this->esc((string) $location->getPostalCode()).';'
                .$this->esc((string) $location->getCountry());
        }

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

        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";
    }

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