/**
 * presentEventCapacityBadge — label + tone for browse/discovery capacity chips.
 *
 * Purpose
 * - Shared remaining-capacity / ended / full presentation for medium cards.
 * - Separate from host progress UI (`presentHostCapacity`).
 */

import type { EventCapacityTone } from '@/features/events/eventCapacity'
import { capacityToneFromRemaining, isOccupancyFull, remainingSeatCount } from '@/features/events/eventCapacity'
import { isEventEnded } from '@/features/events/eventEditPolicy'
import { formatNumber } from '@/helpers'
import { format, texts } from '@/texts'

export interface PresentEventCapacityBadgeInput {
  capacity: number
  bookedCount: number
  reservedCapacity?: number
  status?: string
  endsAt?: string
}

export interface PresentEventCapacityBadgeResult {
  label: string
  tone: EventCapacityTone
}

const formatRemainingCapacity = (remaining: number) => {
  if (remaining <= 0) return texts.discovery.capacityFull

  return format(texts.events.remainingCapacity, { count: formatNumber(remaining) })
}

export function presentEventCapacityBadge(input: PresentEventCapacityBadgeInput): PresentEventCapacityBadgeResult {
  const reserved = input.reservedCapacity ?? 0
  const remaining = remainingSeatCount(input.capacity, input.bookedCount, reserved)
  const isFull = isOccupancyFull(input.capacity, input.bookedCount, reserved) || input.status === 'full'

  // لغو/رد با «اتمام رویداد» فرق دارد؛ بج ظرفیت برای این وضعیت‌ها معنا ندارد.
  if (input.status === 'cancelled' || input.status === 'rejected') {
    return { label: '', tone: 'neutral' }
  }

  const isEnded = input.status != null && input.endsAt != null ? isEventEnded(input.status, input.endsAt) : false

  if (isEnded) {
    return { label: texts.events.eventEnded, tone: 'danger' }
  }

  return {
    label: formatRemainingCapacity(remaining),
    tone: isFull ? 'danger' : capacityToneFromRemaining(remaining, input.capacity),
  }
}