import type { ChatMessage, UserButtonConfig } from '@/features/chat/types'

export const GO_TO_LIST_TEXT = '상품 목록으로 가기'

// 마지막 봇 메시지의 next_input_mode 로 하단 입력 UI 구성을 결정한다.
export function deriveUserButtonConfig(
  messages: ChatMessage[],
  isLoading: boolean,
  priceErrorMessage: string,
): UserButtonConfig {
  if (isLoading) return { type: 'loading' }
  if (!messages || messages.length === 0) return { type: '', text: '' }

  const last = messages[messages.length - 1]
  const mode = last.next_input_mode
  const options = last.next_input_type

  if (last.chat_end) return { type: 'one-black', text: GO_TO_LIST_TEXT }
  if (mode === 'confirm') return { type: 'one-black', text: options?.[0] || '' }
  if (mode === 'yes_no') return { type: 'black-white', textList: options || [] }
  if (mode === 'percent') return { type: 'percent' }
  if (mode === 'price') return { type: 'price', priceErrorMessage: priceErrorMessage || undefined }
  if (mode === 'delivery_type') return { type: 'three-black', textList: options || [] }
  return { type: '', text: '' }
}