Steuerkram/src/Controllers/UstvaController.php

<?php

declare(strict_types=1);

namespace Steuerkram\Controllers;

use Steuerkram\Models\Setting;
use Steuerkram\Database;
use Steuerkram\Services\UstvaCalculator;
use Steuerkram\Services\ElsterXmlService;
use Steuerkram\View;

class UstvaController extends BaseController
{
    public function index(array $params): void
    {
        $submissions = Database::fetchAll(
            'SELECT * FROM ustva_submissions ORDER BY year DESC, month DESC'
        );

        $years = [];
        for ($y = (int)date('Y'); $y >= 2020; $y--) $years[] = $y;

        $view = new View();
        $view->render('layout/base.php', [
            'pageTitle' => 'Umsatzsteuervoranmeldung',
            'content'   => $this->renderView('tax/ustva_index', [
                'submissions' => $submissions,
                'years'       => $years,
            ]),
        ]);
    }

    public function show(array $params): void
    {
        $year  = (int)$params['year'];
        $month = (int)$params['month'];

        if ($month < 1 || $month > 12) {
            View::redirect('/tax/ustva', 'Ungültiger Monat.', 'error');
            return;
        }

        $calc = new UstvaCalculator();
        $kz   = $calc->calculate($year, $month);

        // Load saved submission if exists
        $saved = Database::fetchOne(
            'SELECT * FROM ustva_submissions WHERE year=? AND month=?', [$year, $month]
        );

        $settings = Setting::get();
        $months   = ['Januar','Februar','März','April','Mai','Juni','Juli','August','September','Oktober','November','Dezember'];

        $view = new View();
        $view->render('layout/base.php', [
            'pageTitle'     => "UStVA {$months[$month-1]} {$year}",
            'content'       => $this->renderView('tax/ustva_show', [
                'year'     => $year,
                'month'    => $month,
                'kz'       => $kz,
                'saved'    => $saved,
                'settings' => $settings,
                'months'   => $months,
            ]),
            'topbarActions' => '<a href="/tax/ustva/' . $year . '/' . $month . '/xml" class="btn btn-secondary">ELSTER XML herunterladen</a>',
        ]);
    }

    public function save(array $params): void
    {
        $year  = (int)$params['year'];
        $month = (int)$params['month'];

        $calc = new UstvaCalculator();
        $kz   = $calc->calculate($year, $month);

        $xmlSvc = new ElsterXmlService();
        $xml    = $xmlSvc->generate($year, $month, $kz);

        // Upsert
        $existing = Database::fetchOne(
            'SELECT id FROM ustva_submissions WHERE year=? AND month=?', [$year, $month]
        );

        if ($existing) {
            Database::execute(
                'UPDATE ustva_submissions SET xml_content=?, field_values=? WHERE year=? AND month=?',
                [$xml, json_encode($kz, JSON_UNESCAPED_UNICODE), $year, $month]
            );
        } else {
            Database::execute(
                'INSERT INTO ustva_submissions (year, month, xml_content, field_values) VALUES (?,?,?,?)',
                [$year, $month, $xml, json_encode($kz, JSON_UNESCAPED_UNICODE)]
            );
        }

        View::redirect("/tax/ustva/{$year}/{$month}", 'UStVA gespeichert.');
    }

    public function showKzBookings(array $params): void
    {
        $year  = (int)$params['year'];
        $month = (int)$params['month'];
        $kz    = $params['kz'] ?? '';

        $validKz = ['81', '89', '66', '61', '83'];
        if (!in_array($kz, $validKz, true)) {
            View::redirect("/tax/ustva/{$year}/{$month}", 'Ungültige Kennzahl.', 'error');
            return;
        }

        $calc     = new UstvaCalculator();
        $kzData   = $calc->calculate($year, $month);
        $bookings = $calc->fetchBookingsForKz($year, $month, $kz);

        $months = ['Januar','Februar','März','April','Mai','Juni','Juli','August','September','Oktober','November','Dezember'];

        $view = new View();
        $view->render('layout/base.php', [
            'pageTitle' => "Kz {$kz} – {$months[$month-1]} {$year}",
            'content'   => $this->renderView('tax/ustva_kz_bookings', [
                'year'     => $year,
                'month'    => $month,
                'kz'       => $kz,
                'kzName'   => $kzData[$kz]['name'] ?? '',
                'bookings' => $bookings,
                'months'   => $months,
            ]),
        ]);
    }

    public function downloadXml(array $params): void
    {
        $year  = (int)$params['year'];
        $month = (int)$params['month'];

        // Recalculate fresh
        $calc = new UstvaCalculator();
        $kz   = $calc->calculate($year, $month);

        $xmlSvc = new ElsterXmlService();
        $xml    = $xmlSvc->generate($year, $month, $kz);

        $filename = sprintf('UStVA_%04d_%02d.xml', $year, $month);
        header('Content-Type: application/xml; charset=utf-8');
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        header('Content-Length: ' . strlen($xml));
        echo $xml;
    }
}