function formatRole(role) {
	if (role === "branch") return "Niederlassung";
	if (role === "admin") return "Admin";
	if (role === "superadmin") return "Superadmin";
	if (role === "dev") return "Entwicklung";
	return role ? String(role) : "Unbekannt";
}

export function buildSupportMailto({ user, currentUrl, pathname, userAgent }) {
	const to = "info@attus.de";

	const roleLabel = user ? formatRole(user.role) : "Unbekannt";
	const userLabel = user?.branchId
		? `${roleLabel} (${user.branchId})`
		: roleLabel;

	const now = new Date();
	const tz =
		typeof Intl !== "undefined"
			? Intl.DateTimeFormat().resolvedOptions().timeZone
			: "";

	const timestampLocal = now.toLocaleString("de-DE");
	const timestampIso = now.toISOString();

	const routeLine = pathname ? `Route: ${pathname}` : "Route: (unbekannt)";
	const urlLine = currentUrl ? `URL: ${currentUrl}` : "URL: (bitte einfügen)";
	const uaLine = userAgent
		? `User-Agent: ${userAgent}`
		: "User-Agent: (unbekannt)";
	const timeLine = tz
		? `Zeitpunkt: ${timestampLocal} (${tz})`
		: `Zeitpunkt: ${timestampLocal}`;
	const isoLine = `ISO: ${timestampIso}`;

	const subject = user?.branchId
		? `Support – RHL Lieferscheine (${user.branchId})`
		: "Support – RHL Lieferscheine";

	const body = [
		"Hallo attus Support,",
		"",
		"bitte beschreibt hier kurz das Anliegen:",
		"",
		"- Was wollten Sie tun?",
		"- Was ist passiert?",
		"- (Optional) Screenshot / Zeitpunkt",
		"",
		"--- Kontext (bitte drin lassen) ---",
		`Benutzer: ${userLabel}`,
		routeLine,
		urlLine,
		timeLine,
		isoLine,
		uaLine,
		"----------------------------------",
		"",
		"Vielen Dank.",
	].join("\r\n");

	return `mailto:${to}?subject=${encodeURIComponent(subject)}&body=${encodeURIComponent(
		body,
	)}`;
}