// Analytics event names — single source of truth
export const ANALYTICS_EVENTS = {
  BOOKING_STEP_SERVICE: "booking_step_service",
  BOOKING_STEP_TIME: "booking_step_time",
  BOOKING_STEP_CONTACT: "booking_step_contact",
  BOOKING_STEP_SUBMIT: "booking_step_submit",
  BOOKING_CONFIRMED: "booking_confirmed",
  BOOKING_ERROR: "booking_error",
} as const;

export type AnalyticsEventName = (typeof ANALYTICS_EVENTS)[keyof typeof ANALYTICS_EVENTS];

export type AnalyticsPayload = {
  step?: string;
  flow?: "public" | "portal";
  [key: string]: string | undefined;
};

/**
 * Fires a lightweight analytics event via window.dispatchEvent.
 * No-op safe: failures are swallowed so analytics never breaks the booking flow.
 * Designed for later Plausible/GTM integration.
 */
export function fireAnalyticsEvent(
  eventName: AnalyticsEventName,
  payload: AnalyticsPayload = {}
): void {
  try {
    window.dispatchEvent(
      new CustomEvent(eventName, {
        detail: {
          ...payload,
          timestamp: new Date().toISOString(),
        },
      })
    );
  } catch {
    // no-op: analytics must never break the booking flow
  }
}