// Sidebar nav collapse state — persisted in the `mxgateway_nav` cookie so it
// survives full page reloads and reconnects. Invoked from MainLayout.razor via
// JS interop (window.navState.get / .set). Pattern lifted from ScadaLink
// CentralUI's wwwroot/js/nav-state.js.
window.navState = {
    // Returns the raw cookie value (comma-separated expanded section ids), or
    // an empty string when the cookie is absent.
    get: function () {
        const match = document.cookie.match(/(?:^|;\s*)mxgateway_nav=([^;]*)/);
        return match ? decodeURIComponent(match[1]) : "";
    },
    // Writes the cookie with a one-year lifetime. SameSite=Lax; not HttpOnly
    // (JS must write it) and not sensitive.
    set: function (value) {
        const oneYearSeconds = 60 * 60 * 24 * 365;
        document.cookie = "mxgateway_nav=" + encodeURIComponent(value) +
            ";path=/;max-age=" + oneYearSeconds + ";samesite=lax";
    }
};