<?php

declare(strict_types=1);

namespace App\Controllers;

class HomeController extends Controller
{
    public function index(): void
    {
        session_start();

        // --- Helper functions ---
        $normalizeContactValue = function (string $value): string {
            return trim($value);
        };

        $escapeContactValue = function (string $value): string {
            return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
        };

        $containsHeaderInjection = function (string $value): bool {
            return (bool) preg_match('/[\r\n]/', $value);
        };

        // --- Form processing ---
        $formErrors = [];
        $formSuccess = false;
        if (!empty($_SESSION['form_success'])) {
            $formSuccess = true;
            unset($_SESSION['form_success']);
        }
        if (!empty($_SESSION['form_errors'])) {
            $formErrors = $_SESSION['form_errors'];
            unset($_SESSION['form_errors']);
        }
        if (!empty($_SESSION['form_data'])) {
            $formData = $_SESSION['form_data'];
            unset($_SESSION['form_data']);
        } else {
            $formData = ['fname' => '', 'lname' => '', 'email' => '', 'phone' => '', 'interest' => 'Besichtigung anfragen', 'message' => ''];
        }

        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $formData['fname']    = $normalizeContactValue((string) ($_POST['fname'] ?? ''));
            $formData['lname']    = $normalizeContactValue((string) ($_POST['lname'] ?? ''));
            $formData['email']    = $normalizeContactValue((string) ($_POST['email'] ?? ''));
            $formData['phone']    = $normalizeContactValue((string) ($_POST['phone'] ?? ''));
            $formData['interest'] = $normalizeContactValue((string) ($_POST['interest'] ?? ''));
            $formData['message']  = $normalizeContactValue((string) ($_POST['message'] ?? ''));

            $honeypot = $normalizeContactValue((string) ($_POST['website'] ?? ''));
            if ($honeypot !== '') {
                header('Location: /#form-result');
                $_SESSION['form_success'] = true;
                exit;
            } else {
                if ($formData['fname'] === '') {
                    $formErrors[] = 'Bitte geben Sie Ihren Vornamen an.';
                }
                if ($formData['lname'] === '') {
                    $formErrors[] = 'Bitte geben Sie Ihren Nachnamen an.';
                }
                if ($formData['email'] === '' || !filter_var($formData['email'], FILTER_VALIDATE_EMAIL)) {
                    $formErrors[] = 'Bitte geben Sie eine gültige E-Mail-Adresse an.';
                }
                if ($formData['message'] === '') {
                    $formErrors[] = 'Bitte geben Sie eine Nachricht ein.';
                }

                if ($containsHeaderInjection($formData['email']) || $containsHeaderInjection($formData['fname'] . ' ' . $formData['lname'])) {
                    $formErrors[] = 'Ungültige Zeichen in den Eingabefeldern.';
                }

                $formTime = isset($_POST['form_time']) ? (int) $_POST['form_time'] : 0;
                if ($formTime > 0 && (time() - $formTime) < 3) {
                    $formErrors[] = 'Das Formular wurde zu schnell abgeschickt. Bitte versuchen Sie es erneut.';
                }

                $lastSubmit = $_SESSION['last_contact_submit'] ?? 0;
                if ($lastSubmit && (time() - $lastSubmit) < 60) {
                    $formErrors[] = 'Bitte warten Sie einen Moment vor der nächsten Anfrage.';
                }

                if (empty($formErrors)) {
                    $to      = 'mki@kies-media.de';
                    $subject = 'Kontaktanfrage: ' . $formData['interest'];
                    $body    = "Von: {$formData['fname']} {$formData['lname']}\n"
                             . "E-Mail: {$formData['email']}\n";
                    if ($formData['phone'] !== '') {
                        $body .= "Telefon: {$formData['phone']}\n";
                    }
                    $body .= "Anliegen: {$formData['interest']}\n\n"
                             . $formData['message'];

                    $headers  = "From: {$formData['email']}\r\n";
                    $headers .= "Reply-To: {$formData['email']}\r\n";
                    $headers .= "Content-Type: text/plain; charset=UTF-8\r\n";
                    $headers .= "X-Mailer: PHP/" . phpversion();

                    $mailSent = mail($to, $subject, $body, $headers);

                    if ($mailSent) {
                        $_SESSION['last_contact_submit'] = time();
                        header('Location: /#form-result');
                        $_SESSION['form_success'] = true;
                        exit;
                    } else {
                        $formErrors[] = 'Leider konnte die E-Mail nicht gesendet werden. Bitte versuchen Sie es später erneut oder schreiben Sie uns direkt an mki@kies-media.de.';
                    }
                }
            }
            if (!empty($formErrors)) {
                header('Location: /#form-result');
                $_SESSION['form_errors'] = $formErrors;
                $_SESSION['form_data'] = $formData;
                exit;
            }
        }

        $this->render('home/index', [
            'formSuccess'        => $formSuccess,
            'formErrors'         => $formErrors,
            'formData'           => $formData,
            'escapeContactValue' => $escapeContactValue,
            'pageTitle'          => 'Einfamilienhaus mieten Schleusingen | 227 m², 6 Zimmer | 1.300 € Kaltmiete',
            'pageDescription'    => 'Einfamilienhaus zur Langzeitmiete in Schleusingen: 227 m² Wohnfläche, 6 Zimmer, 3 Etagen mit Dachterrasse. Kaltmiete 1.300 €. Bahnhofstraße 10, 98553 Schleusingen. Ab sofort verfügbar.',
            'canonical'          => 'https://haus-schleusingen.de/',
            'openGraph'          => [
                'ogTitle'       => 'Einfamilienhaus zur Miete in Schleusingen – 227 m², 6 Zimmer',
                'ogDescription' => 'Großzügiges Einfamilienhaus zur Langzeitmiete: 227 m², 6 Zimmer, 3 Etagen + Dachterrasse. Kaltmiete 1.300 €. Ab sofort verfügbar in Schleusingen.',
                'ogImage'       => 'https://haus-schleusingen.de/bilder/Außenansicht-2.png',
                'ogUrl'         => 'https://haus-schleusingen.de/',
            ],
            'structuredData'     => json_encode([
                '@context'     => 'https://schema.org',
                '@type'        => 'RealEstateListing',
                'name'         => 'Einfamilienhaus zur Miete in Schleusingen',
                'description'  => 'Großzügiges Einfamilienhaus zur Langzeitmiete: 227 m² Wohnfläche, 6 Zimmer, 3 Etagen mit Dachterrasse. Kaltmiete 1.300 €.',
                'url'          => 'https://haus-schleusingen.de/',
                'image'        => 'https://haus-schleusingen.de/bilder/Außenansicht-2.png',
                'datePosted'   => '2026-05-14',
                'address'      => [
                    '@type'           => 'PostalAddress',
                    'streetAddress'   => 'Bahnhofstraße 10',
                    'addressLocality' => 'Schleusingen',
                    'postalCode'      => '98553',
                    'addressCountry'  => 'DE',
                ],
                'offers' => [
                    '@type'            => 'Offer',
                    'price'           => '1300',
                    'priceCurrency'   => 'EUR',
                    'priceSpecification' => [
                        '@type'       => 'UnitPriceSpecification',
                        'price'       => '1300',
                        'priceCurrency' => 'EUR',
                        'unitCode'    => 'MON',
                        'description' => 'Kaltmiete pro Monat',
                    ],
                ],
                'floorSize' => [
                    '@type'    => 'QuantitativeValue',
                    'value'    => '227',
                    'unitCode' => 'MTK',
                ],
                'numberOfRooms' => [
                    '@type'  => 'QuantitativeValue',
                    'value'  => '6',
                ],
            ]),
        ]);
    }
}