let telemetryPromise = null;
const pendingUxEvents = [];

export function initializeTelemetry() {
    if (['localhost', '127.0.0.1', '::1'].includes(window.location.hostname)) {
        return Promise.resolve();
    }
    if (!telemetryPromise) {
        telemetryPromise = import('/vendor/otel.js').then(() => flushPendingUxEvents()).catch(error => {
            console.warn('Не удалось инициализировать браузерную телеметрию');
        });
    }
    return telemetryPromise;
}

export function trackUxEvent(name, attributes = {}) {
    const event = {
        name: String(name || 'неизвестное_событие'),
        attributes: sanitizeAttributes(attributes),
        timestamp: new Date().toISOString()
    };
    document.dispatchEvent(new CustomEvent('magistr:ux-event', { detail: event }));
    if (typeof window.__magistrTrackUx === 'function') {
        window.__magistrTrackUx(event.name, event.attributes);
    } else {
        pendingUxEvents.push(event);
        if (pendingUxEvents.length > 100) pendingUxEvents.shift();
    }
}

export function flushPendingUxEvents() {
    if (typeof window.__magistrTrackUx !== 'function') return;
    pendingUxEvents.splice(0).forEach(event => window.__magistrTrackUx(event.name, event.attributes));
}

function sanitizeAttributes(attributes) {
    return Object.fromEntries(Object.entries(attributes || {})
        .filter(([, value]) => ['string', 'number', 'boolean'].includes(typeof value))
        .map(([key, value]) => [String(key), value]));
}