import React, { useEffect, useState } from 'react'
import { ChatAnswerAttachment } from './ChatAnswerAttchment'
import { ChatAnswerOperate } from './ChatAnswerOperate'
import { formatMarkdown } from './markdownFormatter'
import type { Answer } from '@/types/chat'
import { MarkdownDetail } from '@/components/MarkdownDetail'
import { fetchTerminateQuestion } from '@/api/chat'

interface ChatAnswerParserProps {
  answer: Answer
  isStopTyping: boolean | undefined
  isLastAnswer: boolean
  onTyping: () => void
  onComplate: () => void
  onSubmitQuestion: (question: string, productCode?: string) => void
}

export const ChatAnswerParser: React.FC<ChatAnswerParserProps> = ({ isLastAnswer, onTyping, onComplate, answer, isStopTyping, onSubmitQuestion }) => {
  const formatAnswer = formatMarkdown(answer.answer || '')
  const [displayedText, setDisplayedText] = useState('')
  const [currentIndex, setCurrentIndex] = useState(0)
  const [isTyping, setIsTyping] = useState(false)
  const [hideOperate, setHideOperate] = useState(false)

  useEffect(() => {
    if (isStopTyping) {
      return
    }
    if (!isTyping) {
      onTyping()
      setIsTyping(true)
    }
    if (currentIndex < formatAnswer.length) {
      const timer = setTimeout(() => {
        setDisplayedText(formatAnswer.slice(0, currentIndex + 1))
        setCurrentIndex(prevIndex => prevIndex + 1)
      }, 20) // 调整此值以改变打字速度

      return () => clearTimeout(timer)
    }
    else {
      if (answer.endAnswerFlag) {
        setIsTyping(false)
        onComplate()
      }
    }
  }, [answer, currentIndex])

  const handleStopTyping = async () => {
    const res = await fetchTerminateQuestion(answer)
    if (res.ok) {
      setIsTyping(false)
      onComplate()
    }
  }

  useEffect(() => {
    if (isStopTyping) {
      handleStopTyping()
    }
  }, [isStopTyping])

  useEffect(() => {
    setHideOperate((answer.attachmentList || []).some(attachment => attachment.type === 'box'))
  }, [answer.attachmentList])

  return (
    <div className="answerParser">
      {!!displayedText.length && (
        <div className={answer.attachmentList?.length ? 'mb-[20px]' : ''}>
          <MarkdownDetail>
            {displayedText}
          </MarkdownDetail>
        </div>
      )}
      {!isTyping
      && answer.attachmentList
      && answer.attachmentList?.length !== 0
      && <ChatAnswerAttachment isLastAnswer={isLastAnswer} onSubmitQuestion={onSubmitQuestion} answer={answer} />}

      {!isTyping && !hideOperate && <ChatAnswerOperate answer={answer} />}
    </div>
  )
}
