<?php


function getContactSubjectMap(): array {
    return [
        'allgemeine-anfrage' => 'Allgemeine Anfrage',
        'vpc-anfrage' => 'Virtual Private Container Anfrage',
        'vps-anfrage' => 'Virtual Private Server Anfrage',
        'mail-gateway-anfrage' => 'Mail Gateway Anfrage',
        'webhosting-anfrage' => 'Webhosting Anfrage',
        'it-beratung' => 'IT-Beratung',
        'it-support' => 'IT-Support & Fehlerbehebung',
        'netzwerk-wlan' => 'Netzwerk & WLAN-Einrichtung',
        'it-sicherheit-backup' => 'IT-Sicherheit & Backup',
        'webseiten-hosting-service' => 'Webseiten- & Hosting-Service',
        'wartung-betreuung' => 'Wartung & Betreuung',
        'support' => 'Technischer Support',
        'beratung' => 'Persönliche Beratung',
        'migration' => 'Migration/Umzug',
        'sonstiges' => 'Sonstige Anfrage',
    ];
}


function isAllowedContactSubject(string $subjectKey): bool {
    return array_key_exists($subjectKey, getContactSubjectMap());
}


function getPreselectedContactSubject(): string {
    $productMap = [
        'vpc' => 'vpc-anfrage',
        'vps' => 'vps-anfrage',
        'mail-gateway' => 'mail-gateway-anfrage',
        'webhosting' => 'webhosting-anfrage',
    ];

    if (!empty($_GET['product'])) {
        $product = strtolower(preg_replace('/[^a-z0-9-]/', '', (string) $_GET['product']));
        if (isset($productMap[$product])) {
            return $productMap[$product];
        }
    }

    if (!empty($_GET['package'])) {
        $package = strtolower(preg_replace('/[^a-z0-9-]/', '', (string) $_GET['package']));
        foreach ($productMap as $productId => $subjectKey) {
            if (str_starts_with($package, $productId . '-')) {
                return $subjectKey;
            }
        }
    }

    return '';
}