'use client'
import type { FC } from 'react'
import React, { memo, useEffect, useMemo, useState } from 'react'
import { useDebounceFn } from 'ahooks'
import { HashtagIcon } from '@heroicons/react/24/solid'
import { useTranslation } from 'react-i18next'
import { useContext } from 'use-context-selector'
import { isNil, omitBy } from 'lodash-es'
import {
  RiCloseLine,
  RiEditLine,
} from '@remixicon/react'
import { StatusItem } from '../../list'
import { DocumentContext } from '../index'
import { ProcessStatus } from '../segment-add'
import s from './style.module.css'
import InfiniteVirtualList from './InfiniteVirtualList'
import cn from '@/utils/classnames'
import { formatNumber } from '@/utils/format'
import Modal from '@/app/components/base/modal'
import Switch from '@/app/components/base/switch'
import Divider from '@/app/components/base/divider'
import Input from '@/app/components/base/input'
import { ToastContext } from '@/app/components/base/toast'
import type { Item } from '@/app/components/base/select'
import { SimpleSelect } from '@/app/components/base/select'
import { deleteSegment, disableSegment, enableSegment, fetchSegments, updateSegment } from '@/service/datasets'
import type { SegmentDetailModel, SegmentUpdater, SegmentsQuery, SegmentsResponse } from '@/models/datasets'
import { asyncRunSafe } from '@/utils'
import type { CommonResponse } from '@/models/common'
import AutoHeightTextarea from '@/app/components/base/auto-height-textarea/common'
import Button from '@/app/components/base/button'
import NewSegmentModal from '@/app/components/datasets/documents/detail/new-segment-modal'
import TagInput from '@/app/components/base/tag-input'
import { useEventEmitterContextContext } from '@/context/event-emitter'

export const SegmentIndexTag: FC<{ positionId: string | number; className?: string }> = ({ positionId, className }) => {
  const localPositionId = useMemo(() => {
    const positionIdStr = String(positionId)
    if (positionIdStr.length >= 3)
      return positionId
    return positionIdStr.padStart(3, '0')
  }, [positionId])
  return (
    <div className={`text-gray-500 border border-gray-200 box-border flex items-center rounded-md italic text-[11px] pl-1 pr-1.5 font-medium ${className ?? ''}`}>
      <HashtagIcon className='w-3 h-3 text-gray-400 fill-current mr-1 stroke-current stroke-1' />
      {localPositionId}
    </div>
  )
}

type ISegmentDetailProps = {
  embeddingAvailable: boolean
  segInfo?: Partial<SegmentDetailModel> & { id: string }
  onChangeSwitch?: (segId: string, enabled: boolean) => Promise<void>
  onUpdate: (segmentId: string, q: string, a: string, k: string[]) => void
  onCancel: () => void
  archived?: boolean
}
/**
 * Show all the contents of the segment
 */
const SegmentDetailComponent: FC<ISegmentDetailProps> = ({
  embeddingAvailable,
  segInfo,
  archived,
  onChangeSwitch,
  onUpdate,
  onCancel,
}) => {
  const { t } = useTranslation()
  const [isEditing, setIsEditing] = useState(false)
  const [question, setQuestion] = useState(segInfo?.content || '')
  const [answer, setAnswer] = useState(segInfo?.answer || '')
  const [keywords, setKeywords] = useState<string[]>(segInfo?.keywords || [])
  const { eventEmitter } = useEventEmitterContextContext()
  const [loading, setLoading] = useState(false)

  eventEmitter?.useSubscription((v) => {
    if (v === 'update-segment')
      setLoading(true)
    else
      setLoading(false)
  })

  const handleCancel = () => {
    setIsEditing(false)
    setQuestion(segInfo?.content || '')
    setAnswer(segInfo?.answer || '')
    setKeywords(segInfo?.keywords || [])
  }
  const handleSave = () => {
    onUpdate(segInfo?.id || '', question, answer, keywords)
  }

  const renderContent = () => {
    if (segInfo?.answer) {
      return (
        <>
          <div className='mb-1 text-xs font-medium text-gray-500'>QUESTION</div>
          <AutoHeightTextarea
            outerClassName='mb-4'
            className='leading-6 text-md text-gray-800'
            value={question}
            placeholder={t('datasetDocuments.segment.questionPlaceholder') || ''}
            onChange={e => setQuestion(e.target.value)}
            disabled={!isEditing}
          />
          <div className='mb-1 text-xs font-medium text-gray-500'>ANSWER</div>
          <AutoHeightTextarea
            outerClassName='mb-4'
            className='leading-6 text-md text-gray-800'
            value={answer}
            placeholder={t('datasetDocuments.segment.answerPlaceholder') || ''}
            onChange={e => setAnswer(e.target.value)}
            disabled={!isEditing}
            autoFocus
          />
        </>
      )
    }

    return (
      <AutoHeightTextarea
        className='leading-6 text-md text-gray-800'
        value={question}
        placeholder={t('datasetDocuments.segment.contentPlaceholder') || ''}
        onChange={e => setQuestion(e.target.value)}
        disabled={!isEditing}
        autoFocus
      />
    )
  }

  return (
    <div className={'flex flex-col relative'}>
      <div className='absolute right-0 top-0 flex items-center h-7'>
        {isEditing && (
          <>
            <Button
              onClick={handleCancel}>
              {t('common.operation.cancel')}
            </Button>
            <Button
              variant='primary'
              className='ml-3'
              onClick={handleSave}
              disabled={loading}
            >
              {t('common.operation.save')}
            </Button>
          </>
        )}
        {!isEditing && !archived && embeddingAvailable && (
          <>
            <div className='group relative flex justify-center items-center w-6 h-6 hover:bg-gray-100 rounded-md cursor-pointer'>
              <div className={cn(s.editTip, 'hidden items-center absolute -top-10 px-3 h-[34px] bg-white rounded-lg whitespace-nowrap text-xs font-semibold text-gray-700 group-hover:flex')}>{t('common.operation.edit')}</div>
              <RiEditLine className='w-4 h-4 text-gray-500' onClick={() => setIsEditing(true)} />
            </div>
            <div className='mx-3 w-[1px] h-3 bg-gray-200' />
          </>
        )}
        <div className='flex justify-center items-center w-6 h-6 cursor-pointer' onClick={onCancel}>
          <RiCloseLine className='w-4 h-4 text-gray-500' />
        </div>
      </div>
      <SegmentIndexTag positionId={segInfo?.position || ''} className='w-fit mt-[2px] mb-6' />
      <div className={s.segModalContent}>{renderContent()}</div>
      <div className={s.keywordTitle}>{t('datasetDocuments.segment.keywords')}</div>
      <div className={s.keywordWrapper}>
        {!segInfo?.keywords?.length
          ? '-'
          : (
            <TagInput
              items={keywords}
              onChange={newKeywords => setKeywords(newKeywords)}
              disableAdd={!isEditing}
              disableRemove={!isEditing || (keywords.length === 1)}
            />
          )
        }
      </div>
      <div className={cn(s.footer, s.numberInfo)}>
        <div className='flex items-center flex-wrap gap-y-2'>
          <div className={cn(s.commonIcon, s.typeSquareIcon)} /><span className='mr-8'>{formatNumber(segInfo?.word_count as number)} {t('datasetDocuments.segment.characters')}</span>
          <div className={cn(s.commonIcon, s.targetIcon)} /><span className='mr-8'>{formatNumber(segInfo?.hit_count as number)} {t('datasetDocuments.segment.hitCount')}</span>
          <div className={cn(s.commonIcon, s.bezierCurveIcon)} /><span className={s.hashText}>{t('datasetDocuments.segment.vectorHash')}{segInfo?.index_node_hash}</span>
        </div>
        <div className='flex items-center'>
          <StatusItem status={segInfo?.enabled ? 'enabled' : 'disabled'} reverse textCls='text-gray-500 text-xs' />
          {embeddingAvailable && (
            <>
              <Divider type='vertical' className='!h-2' />
              <Switch
                size='md'
                defaultValue={segInfo?.enabled}
                onChange={async (val) => {
                  await onChangeSwitch?.(segInfo?.id || '', val)
                }}
                disabled={archived}
              />
            </>
          )}
        </div>
      </div>
    </div>
  )
}
export const SegmentDetail = memo(SegmentDetailComponent)

export const splitArray = (arr: any[], size = 3) => {
  if (!arr || !arr.length)
    return []
  const result = []
  for (let i = 0; i < arr.length; i += size)
    result.push(arr.slice(i, i + size))
  return result
}

type ICompletedProps = {
  embeddingAvailable: boolean
  showNewSegmentModal: boolean
  onNewSegmentModalChange: (state: boolean) => void
  importStatus: ProcessStatus | string | undefined
  archived?: boolean
  // data: Array<{}> // all/part segments
}
/**
 * Embedding done, show list of all segments
 * Support search and filter
 */
const Completed: FC<ICompletedProps> = ({
  embeddingAvailable,
  showNewSegmentModal,
  onNewSegmentModalChange,
  importStatus,
  archived,
}) => {
  const { t } = useTranslation()
  const { notify } = useContext(ToastContext)
  const { datasetId = '', documentId = '', docForm } = useContext(DocumentContext)
  // the current segment id and whether to show the modal
  const [currSegment, setCurrSegment] = useState<{ segInfo?: SegmentDetailModel; showModal: boolean }>({ showModal: false })

  const [inputValue, setInputValue] = useState<string>('') // the input value
  const [searchValue, setSearchValue] = useState<string>('') // the search value
  const [selectedStatus, setSelectedStatus] = useState<boolean | 'all'>('all') // the selected status, enabled/disabled/undefined

  const [lastSegmentsRes, setLastSegmentsRes] = useState<SegmentsResponse | undefined>(undefined)
  const [allSegments, setAllSegments] = useState<Array<SegmentDetailModel[]>>([]) // all segments data
  const [loading, setLoading] = useState(false)
  const [total, setTotal] = useState<number | undefined>()
  const { eventEmitter } = useEventEmitterContextContext()

  const { run: handleSearch } = useDebounceFn(() => {
    setSearchValue(inputValue)
  }, { wait: 500 })

  const handleInputChange = (value: string) => {
    setInputValue(value)
    handleSearch()
  }

  const onChangeStatus = ({ value }: Item) => {
    setSelectedStatus(value === 'all' ? 'all' : !!value)
  }

  const getSegments = async (needLastId?: boolean) => {
    const finalLastId = lastSegmentsRes?.data?.[lastSegmentsRes.data.length - 1]?.id || ''
    setLoading(true)
    const [e, res] = await asyncRunSafe<SegmentsResponse>(fetchSegments({
      datasetId,
      documentId,
      params: omitBy({
        last_id: !needLastId ? undefined : finalLastId,
        limit: 12,
        keyword: searchValue,
        enabled: selectedStatus === 'all' ? 'all' : !!selectedStatus,
      }, isNil) as SegmentsQuery,
    }) as Promise<SegmentsResponse>)
    if (!e) {
      setAllSegments([...(!needLastId ? [] : allSegments), ...splitArray(res.data || [])])
      setLastSegmentsRes(res)
      if (!lastSegmentsRes || !needLastId)
        setTotal(res?.total || 0)
    }
    setLoading(false)
  }

  const resetList = () => {
    setLastSegmentsRes(undefined)
    setAllSegments([])
    setLoading(false)
    setTotal(undefined)
    getSegments(false)
  }

  const onClickCard = (detail: SegmentDetailModel) => {
    setCurrSegment({ segInfo: detail, showModal: true })
  }

  const onCloseModal = () => {
    setCurrSegment({ ...currSegment, showModal: false })
  }

  const onChangeSwitch = async (segId: string, enabled: boolean) => {
    const opApi = enabled ? enableSegment : disableSegment
    const [e] = await asyncRunSafe<CommonResponse>(opApi({ datasetId, segmentId: segId }) as Promise<CommonResponse>)
    if (!e) {
      notify({ type: 'success', message: t('common.actionMsg.modifiedSuccessfully') })
      for (const item of allSegments) {
        for (const seg of item) {
          if (seg.id === segId)
            seg.enabled = enabled
        }
      }
      setAllSegments([...allSegments])
    }
    else {
      notify({ type: 'error', message: t('common.actionMsg.modifiedUnsuccessfully') })
    }
  }

  const onDelete = async (segId: string) => {
    const [e] = await asyncRunSafe<CommonResponse>(deleteSegment({ datasetId, documentId, segmentId: segId }) as Promise<CommonResponse>)
    if (!e) {
      notify({ type: 'success', message: t('common.actionMsg.modifiedSuccessfully') })
      resetList()
    }
    else {
      notify({ type: 'error', message: t('common.actionMsg.modifiedUnsuccessfully') })
    }
  }

  const handleUpdateSegment = async (segmentId: string, question: string, answer: string, keywords: string[]) => {
    const params: SegmentUpdater = { content: '' }
    if (docForm === 'qa_model') {
      if (!question.trim())
        return notify({ type: 'error', message: t('datasetDocuments.segment.questionEmpty') })
      if (!answer.trim())
        return notify({ type: 'error', message: t('datasetDocuments.segment.answerEmpty') })

      params.content = question
      params.answer = answer
    }
    else {
      if (!question.trim())
        return notify({ type: 'error', message: t('datasetDocuments.segment.contentEmpty') })

      params.content = question
    }

    if (keywords.length)
      params.keywords = keywords

    try {
      eventEmitter?.emit('update-segment')
      const res = await updateSegment({ datasetId, documentId, segmentId, body: params })
      notify({ type: 'success', message: t('common.actionMsg.modifiedSuccessfully') })
      onCloseModal()
      for (const item of allSegments) {
        for (const seg of item) {
          if (seg.id === segmentId) {
            seg.answer = res.data.answer
            seg.content = res.data.content
            seg.keywords = res.data.keywords
            seg.word_count = res.data.word_count
            seg.hit_count = res.data.hit_count
            seg.index_node_hash = res.data.index_node_hash
            seg.enabled = res.data.enabled
          }
        }
      }
      setAllSegments([...allSegments])
    }
    finally {
      eventEmitter?.emit('')
    }
  }

  useEffect(() => {
    if (lastSegmentsRes !== undefined)
      getSegments(false)
  }, [selectedStatus, searchValue])

  useEffect(() => {
    if (importStatus === ProcessStatus.COMPLETED)
      resetList()
  }, [importStatus])

  return (
    <>
      <div className={s.docSearchWrapper}>
        <div className={s.totalText}>{total ? formatNumber(total) : '--'} {t('datasetDocuments.segment.paragraphs')}</div>
        <SimpleSelect
          onSelect={onChangeStatus}
          items={[
            { value: 'all', name: t('datasetDocuments.list.index.all') },
            { value: 0, name: t('datasetDocuments.list.status.disabled') },
            { value: 1, name: t('datasetDocuments.list.status.enabled') },
          ]}
          defaultValue={'all'}
          className={s.select}
          wrapperClassName='h-fit w-[120px] mr-2' />
        <Input
          showLeftIcon
          showClearIcon
          wrapperClassName='!w-52'
          value={inputValue}
          onChange={e => handleInputChange(e.target.value)}
          onClear={() => handleInputChange('')}
        />
      </div>
      <InfiniteVirtualList
        embeddingAvailable={embeddingAvailable}
        hasNextPage={lastSegmentsRes?.has_more ?? true}
        isNextPageLoading={loading}
        items={allSegments}
        loadNextPage={getSegments}
        onChangeSwitch={onChangeSwitch}
        onDelete={onDelete}
        onClick={onClickCard}
        archived={archived}
      />
      <Modal isShow={currSegment.showModal} onClose={() => { }} className='!max-w-[640px] !overflow-visible'>
        <SegmentDetail
          embeddingAvailable={embeddingAvailable}
          segInfo={currSegment.segInfo ?? { id: '' }}
          onChangeSwitch={onChangeSwitch}
          onUpdate={handleUpdateSegment}
          onCancel={onCloseModal}
          archived={archived}
        />
      </Modal>
      <NewSegmentModal
        isShow={showNewSegmentModal}
        docForm={docForm}
        onCancel={() => onNewSegmentModalChange(false)}
        onSave={resetList}
      />
    </>
  )
}

export default Completed