// server/lib/metrics.ts
// Pure KPI metric definitions. All return 0 when there is no data (no divide-by-zero).

/** Cancellation rate: cancelled / total, rounded to 1 decimal (percent). */
export function cancelRate(cancelled: number, total: number): number {
  if (total <= 0) return 0;
  return Math.round((cancelled / total) * 1000) / 10;
}

/** No-show rate: noShow / total, rounded to 1 decimal (percent). */
export function noShowRate(noShow: number, total: number): number {
  if (total <= 0) return 0;
  return Math.round((noShow / total) * 1000) / 10;
}

/** Completion rate: completed / total, rounded to the nearest whole percent. */
export function completionRate(completed: number, total: number): number {
  if (total <= 0) return 0;
  return Math.round((completed / total) * 100);
}