dify/web/app/components/base/chat/embedded-chatbot/hooks.tsx

import {
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react'
import { useTranslation } from 'react-i18next'
import useSWR from 'swr'
import { useLocalStorageState } from 'ahooks'
import produce from 'immer'
import type {
  ChatConfig,
  ChatItem,
  Feedback,
} from '../types'
import { CONVERSATION_ID_INFO } from '../constants'
import { buildChatItemTree, getProcessedInputsFromUrlParams, getProcessedSystemVariablesFromUrlParams } from '../utils'
import { getProcessedFilesFromResponse } from '../../file-uploader/utils'
import {
  fetchAppInfo,
  fetchAppMeta,
  fetchAppParams,
  fetchChatList,
  fetchConversations,
  generationConversationName,
  updateFeedback,
} from '@/service/share'
import type {
  // AppData,
  ConversationItem,
} from '@/models/share'
import { useToastContext } from '@/app/components/base/toast'
import { changeLanguage } from '@/i18n/i18next-config'
import { InputVarType } from '@/app/components/workflow/types'
import { TransferMethod } from '@/types/app'
import { addFileInfos, sortAgentSorts } from '@/app/components/tools/utils'
import { noop } from 'lodash-es'

function getFormattedChatList(messages: any[]) {
  const newChatList: ChatItem[] = []
  messages.forEach((item) => {
    const questionFiles = item.message_files?.filter((file: any) => file.belongs_to === 'user') || []
    newChatList.push({
      id: `question-${item.id}`,
      content: item.query,
      isAnswer: false,
      message_files: getProcessedFilesFromResponse(questionFiles.map((item: any) => ({ ...item, related_id: item.id }))),
      parentMessageId: item.parent_message_id || undefined,
    })
    const answerFiles = item.message_files?.filter((file: any) => file.belongs_to === 'assistant') || []
    newChatList.push({
      id: item.id,
      content: item.answer,
      agent_thoughts: addFileInfos(item.agent_thoughts ? sortAgentSorts(item.agent_thoughts) : item.agent_thoughts, item.message_files),
      feedback: item.feedback,
      isAnswer: true,
      citation: item.retriever_resources,
      message_files: getProcessedFilesFromResponse(answerFiles.map((item: any) => ({ ...item, related_id: item.id }))),
      parentMessageId: `question-${item.id}`,
    })
  })
  return newChatList
}

export const useEmbeddedChatbot = () => {
  const isInstalledApp = false
  const { data: appInfo, isLoading: appInfoLoading, error: appInfoError } = useSWR('appInfo', fetchAppInfo)

  const appData = useMemo(() => {
    return appInfo
  }, [appInfo])
  const appId = useMemo(() => appData?.app_id, [appData])

  const [userId, setUserId] = useState<string>()
  const [conversationId, setConversationId] = useState<string>()
  useEffect(() => {
    getProcessedSystemVariablesFromUrlParams().then(({ user_id, conversation_id }) => {
      setUserId(user_id)
      setConversationId(conversation_id)
    })
  }, [])

  useEffect(() => {
    const setLanguageFromParams = async () => {
      // Check URL parameters for language override
      const urlParams = new URLSearchParams(window.location.search)
      const localeParam = urlParams.get('locale')

      // Check for encoded system variables
      const systemVariables = await getProcessedSystemVariablesFromUrlParams()
      const localeFromSysVar = systemVariables.locale

      if (localeParam) {
        // If locale parameter exists in URL, use it instead of default
        changeLanguage(localeParam)
      }
      else if (localeFromSysVar) {
        // If locale is set as a system variable, use that
        changeLanguage(localeFromSysVar)
      }
      else if (appInfo?.site.default_language) {
        // Otherwise use the default from app config
        changeLanguage(appInfo.site.default_language)
      }
    }

    setLanguageFromParams()
  }, [appInfo])

  const [conversationIdInfo, setConversationIdInfo] = useLocalStorageState<Record<string, Record<string, string>>>(CONVERSATION_ID_INFO, {
    defaultValue: {},
  })
  const allowResetChat = !conversationId
  const currentConversationId = useMemo(() => conversationIdInfo?.[appId || '']?.[userId || 'DEFAULT'] || conversationId || '',
    [appId, conversationIdInfo, userId, conversationId])
  const handleConversationIdInfoChange = useCallback((changeConversationId: string) => {
    if (appId) {
      let prevValue = conversationIdInfo?.[appId || '']
      if (typeof prevValue === 'string')
        prevValue = {}
      setConversationIdInfo({
        ...conversationIdInfo,
        [appId || '']: {
          ...prevValue,
          [userId || 'DEFAULT']: changeConversationId,
        },
      })
    }
  }, [appId, conversationIdInfo, setConversationIdInfo, userId])

  const [newConversationId, setNewConversationId] = useState('')
  const chatShouldReloadKey = useMemo(() => {
    if (currentConversationId === newConversationId)
      return ''

    return currentConversationId
  }, [currentConversationId, newConversationId])

  const { data: appParams } = useSWR(['appParams', isInstalledApp, appId], () => fetchAppParams(isInstalledApp, appId))
  const { data: appMeta } = useSWR(['appMeta', isInstalledApp, appId], () => fetchAppMeta(isInstalledApp, appId))
  const { data: appPinnedConversationData } = useSWR(['appConversationData', isInstalledApp, appId, true], () => fetchConversations(isInstalledApp, appId, undefined, true, 100))
  const { data: appConversationData, isLoading: appConversationDataLoading, mutate: mutateAppConversationData } = useSWR(['appConversationData', isInstalledApp, appId, false], () => fetchConversations(isInstalledApp, appId, undefined, false, 100))
  const { data: appChatListData, isLoading: appChatListDataLoading } = useSWR(chatShouldReloadKey ? ['appChatList', chatShouldReloadKey, isInstalledApp, appId] : null, () => fetchChatList(chatShouldReloadKey, isInstalledApp, appId))

  const [clearChatList, setClearChatList] = useState(false)
  const [isResponding, setIsResponding] = useState(false)
  const appPrevChatList = useMemo(
    () => (currentConversationId && appChatListData?.data.length)
      ? buildChatItemTree(getFormattedChatList(appChatListData.data))
      : [],
    [appChatListData, currentConversationId],
  )

  const [showNewConversationItemInList, setShowNewConversationItemInList] = useState(false)

  const pinnedConversationList = useMemo(() => {
    return appPinnedConversationData?.data || []
  }, [appPinnedConversationData])
  const { t } = useTranslation()
  const newConversationInputsRef = useRef<Record<string, any>>({})
  const [newConversationInputs, setNewConversationInputs] = useState<Record<string, any>>({})
  const [initInputs, setInitInputs] = useState<Record<string, any>>({})
  const handleNewConversationInputsChange = useCallback((newInputs: Record<string, any>) => {
    newConversationInputsRef.current = newInputs
    setNewConversationInputs(newInputs)
  }, [])
  const inputsForms = useMemo(() => {
    return (appParams?.user_input_form || []).filter((item: any) => !item.external_data_tool).map((item: any) => {
      if (item.paragraph) {
        let value = initInputs[item.paragraph.variable]
        if (value && item.paragraph.max_length && value.length > item.paragraph.max_length)
          value = value.slice(0, item.paragraph.max_length)

        return {
          ...item.paragraph,
          default: value || item.default,
          type: 'paragraph',
        }
      }
      if (item.number) {
        const convertedNumber = Number(initInputs[item.number.variable]) ?? undefined
        return {
          ...item.number,
          default: convertedNumber || item.default,
          type: 'number',
        }
      }
      if (item.select) {
        const isInputInOptions = item.select.options.includes(initInputs[item.select.variable])
        return {
          ...item.select,
          default: (isInputInOptions ? initInputs[item.select.variable] : undefined) || item.default,
          type: 'select',
        }
      }

      if (item['file-list']) {
        return {
          ...item['file-list'],
          type: 'file-list',
        }
      }

      if (item.file) {
        return {
          ...item.file,
          type: 'file',
        }
      }

      let value = initInputs[item['text-input'].variable]
      if (value && item['text-input'].max_length && value.length > item['text-input'].max_length)
        value = value.slice(0, item['text-input'].max_length)

      return {
        ...item['text-input'],
        default: value || item.default,
        type: 'text-input',
      }
    })
  }, [initInputs, appParams])

  useEffect(() => {
    // init inputs from url params
    (async () => {
      const inputs = await getProcessedInputsFromUrlParams()
      setInitInputs(inputs)
    })()
  }, [])
  useEffect(() => {
    const conversationInputs: Record<string, any> = {}

    inputsForms.forEach((item: any) => {
      conversationInputs[item.variable] = item.default || null
    })
    handleNewConversationInputsChange(conversationInputs)
  }, [handleNewConversationInputsChange, inputsForms])

  const { data: newConversation } = useSWR(newConversationId ? [isInstalledApp, appId, newConversationId] : null, () => generationConversationName(isInstalledApp, appId, newConversationId), { revalidateOnFocus: false })
  const [originConversationList, setOriginConversationList] = useState<ConversationItem[]>([])
  useEffect(() => {
    if (appConversationData?.data && !appConversationDataLoading)
      setOriginConversationList(appConversationData?.data)
  }, [appConversationData, appConversationDataLoading])
  const conversationList = useMemo(() => {
    const data = originConversationList.slice()

    if (showNewConversationItemInList && data[0]?.id !== '') {
      data.unshift({
        id: '',
        name: t('share.chat.newChatDefaultName'),
        inputs: {},
        introduction: '',
      })
    }
    return data
  }, [originConversationList, showNewConversationItemInList, t])

  useEffect(() => {
    if (newConversation) {
      setOriginConversationList(produce((draft) => {
        const index = draft.findIndex(item => item.id === newConversation.id)

        if (index > -1)
          draft[index] = newConversation
        else
          draft.unshift(newConversation)
      }))
    }
  }, [newConversation])

  const currentConversationItem = useMemo(() => {
    let conversationItem = conversationList.find(item => item.id === currentConversationId)

    if (!conversationItem && pinnedConversationList.length)
      conversationItem = pinnedConversationList.find(item => item.id === currentConversationId)

    return conversationItem
  }, [conversationList, currentConversationId, pinnedConversationList])

  const currentConversationLatestInputs = useMemo(() => {
    if (!currentConversationId || !appChatListData?.data.length)
      return newConversationInputsRef.current || {}
    return appChatListData.data.slice().pop().inputs || {}
  }, [appChatListData, currentConversationId])
  const [currentConversationInputs, setCurrentConversationInputs] = useState<Record<string, any>>(currentConversationLatestInputs || {})
  useEffect(() => {
    if (currentConversationItem)
      setCurrentConversationInputs(currentConversationLatestInputs || {})
  }, [currentConversationItem, currentConversationLatestInputs])

  const { notify } = useToastContext()
  const checkInputsRequired = useCallback((silent?: boolean) => {
    let hasEmptyInput = ''
    let fileIsUploading = false
    const requiredVars = inputsForms.filter(({ required }) => required)
    if (requiredVars.length) {
      requiredVars.forEach(({ variable, label, type }) => {
        if (hasEmptyInput)
          return

        if (fileIsUploading)
          return

        if (!newConversationInputsRef.current[variable] && !silent)
          hasEmptyInput = label as string

        if ((type === InputVarType.singleFile || type === InputVarType.multiFiles) && newConversationInputsRef.current[variable] && !silent) {
          const files = newConversationInputsRef.current[variable]
          if (Array.isArray(files))
            fileIsUploading = files.find(item => item.transferMethod === TransferMethod.local_file && !item.uploadedId)
          else
            fileIsUploading = files.transferMethod === TransferMethod.local_file && !files.uploadedId
        }
      })
    }

    if (hasEmptyInput) {
      notify({ type: 'error', message: t('appDebug.errorMessage.valueOfVarRequired', { key: hasEmptyInput }) })
      return false
    }

    if (fileIsUploading) {
      notify({ type: 'info', message: t('appDebug.errorMessage.waitForFileUpload') })
      return
    }

    return true
  }, [inputsForms, notify, t])
  const handleStartChat = useCallback((callback?: any) => {
    if (checkInputsRequired()) {
      setShowNewConversationItemInList(true)
      callback?.()
    }
  }, [setShowNewConversationItemInList, checkInputsRequired])
  const currentChatInstanceRef = useRef<{ handleStop: () => void }>({ handleStop: noop })
  const handleChangeConversation = useCallback((conversationId: string) => {
    currentChatInstanceRef.current.handleStop()
    setNewConversationId('')
    handleConversationIdInfoChange(conversationId)
    if (conversationId)
      setClearChatList(false)
  }, [handleConversationIdInfoChange, setClearChatList])
  const handleNewConversation = useCallback(async () => {
    currentChatInstanceRef.current.handleStop()
    setShowNewConversationItemInList(true)
    handleChangeConversation('')
    handleNewConversationInputsChange(await getProcessedInputsFromUrlParams())
    setClearChatList(true)
  }, [handleChangeConversation, setShowNewConversationItemInList, handleNewConversationInputsChange, setClearChatList])

  const handleNewConversationCompleted = useCallback((newConversationId: string) => {
    setNewConversationId(newConversationId)
    handleConversationIdInfoChange(newConversationId)
    setShowNewConversationItemInList(false)
    mutateAppConversationData()
  }, [mutateAppConversationData, handleConversationIdInfoChange])

  const handleFeedback = useCallback(async (messageId: string, feedback: Feedback) => {
    await updateFeedback({ url: `/messages/${messageId}/feedbacks`, body: { rating: feedback.rating } }, isInstalledApp, appId)
    notify({ type: 'success', message: t('common.api.success') })
  }, [isInstalledApp, appId, t, notify])

  return {
    appInfoError,
    appInfoLoading,
    isInstalledApp,
    allowResetChat,
    appId,
    currentConversationId,
    currentConversationItem,
    handleConversationIdInfoChange,
    appData,
    appParams: appParams || {} as ChatConfig,
    appMeta,
    appPinnedConversationData,
    appConversationData,
    appConversationDataLoading,
    appChatListData,
    appChatListDataLoading,
    appPrevChatList,
    pinnedConversationList,
    conversationList,
    setShowNewConversationItemInList,
    newConversationInputs,
    newConversationInputsRef,
    handleNewConversationInputsChange,
    inputsForms,
    handleNewConversation,
    handleStartChat,
    handleChangeConversation,
    handleNewConversationCompleted,
    newConversationId,
    chatShouldReloadKey,
    handleFeedback,
    currentChatInstanceRef,
    clearChatList,
    setClearChatList,
    isResponding,
    setIsResponding,
    currentConversationInputs,
    setCurrentConversationInputs,
  }
}