export type EventCapacityTone = 'neutral' | 'warning' | 'danger'

export function occupiedSeatCount(bookedCount: number, reservedCapacity: number): number {
  return bookedCount + reservedCapacity
}

export function remainingSeatCount(capacity: number, bookedCount: number, reservedCapacity = 0): number {
  return Math.max(0, capacity - occupiedSeatCount(bookedCount, reservedCapacity))
}

export function isOccupancyFull(capacity: number, bookedCount: number, reservedCapacity = 0): boolean {
  return occupiedSeatCount(bookedCount, reservedCapacity) >= capacity
}

/** Badge tone from remaining / total: red <20%, orange <50%, otherwise gray. */
export function capacityToneFromRemaining(remaining: number, capacity: number): EventCapacityTone {
  if (capacity <= 0) return 'danger'

  const ratio = remaining / capacity

  if (ratio < 0.2) return 'danger'
  if (ratio < 0.5) return 'warning'

  return 'neutral'
}