ragflow/web/src/hooks/logic-hooks.ts

import { Authorization } from '@/constants/authorization';
import { MessageType } from '@/constants/chat';
import { LanguageTranslationMap } from '@/constants/common';
import { Pagination } from '@/interfaces/common';
import { ResponseType } from '@/interfaces/database/base';
import { IAnswer, Message } from '@/interfaces/database/chat';
import { IKnowledgeFile } from '@/interfaces/database/knowledge';
import { IChangeParserConfigRequestBody } from '@/interfaces/request/document';
import { IClientConversation, IMessage } from '@/pages/chat/interface';
import api from '@/utils/api';
import { getAuthorization } from '@/utils/authorization-util';
import { buildMessageUuid, getMessagePureId } from '@/utils/chat';
import { PaginationProps } from 'antd';
import { FormInstance } from 'antd/lib';
import axios from 'axios';
import { EventSourceParserStream } from 'eventsource-parser/stream';
import {
  ChangeEventHandler,
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react';
import { useTranslation } from 'react-i18next';
import { useDispatch } from 'umi';
import { v4 as uuid } from 'uuid';
import { useSetModalState, useTranslate } from './common-hooks';
import { useSetDocumentParser } from './document-hooks';
import { useSetPaginationParams } from './route-hook';
import { useOneNamespaceEffectsLoading } from './store-hooks';
import { useFetchTenantInfo, useSaveSetting } from './user-setting-hooks';

export const useChangeDocumentParser = (documentId: string) => {
  const setDocumentParser = useSetDocumentParser();

  const {
    visible: changeParserVisible,
    hideModal: hideChangeParserModal,
    showModal: showChangeParserModal,
  } = useSetModalState();
  const loading = useOneNamespaceEffectsLoading('kFModel', [
    'document_change_parser',
  ]);

  const onChangeParserOk = useCallback(
    async (parserId: string, parserConfig: IChangeParserConfigRequestBody) => {
      const ret = await setDocumentParser(parserId, documentId, parserConfig);
      if (ret === 0) {
        hideChangeParserModal();
      }
    },
    [hideChangeParserModal, setDocumentParser, documentId],
  );

  return {
    changeParserLoading: loading,
    onChangeParserOk,
    changeParserVisible,
    hideChangeParserModal,
    showChangeParserModal,
  };
};

export const useSetSelectedRecord = <T = IKnowledgeFile>() => {
  const [currentRecord, setCurrentRecord] = useState<T>({} as T);

  const setRecord = (record: T) => {
    setCurrentRecord(record);
  };

  return { currentRecord, setRecord };
};

export const useHandleSearchChange = () => {
  const [searchString, setSearchString] = useState('');

  const handleInputChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) => {
      const value = e.target.value;
      setSearchString(value);
    },
    [],
  );

  return { handleInputChange, searchString };
};

export const useChangeLanguage = () => {
  const { i18n } = useTranslation();
  const { saveSetting } = useSaveSetting();

  const changeLanguage = (lng: string) => {
    i18n.changeLanguage(
      LanguageTranslationMap[lng as keyof typeof LanguageTranslationMap],
    );
    saveSetting({ language: lng });
  };

  return changeLanguage;
};

export const useGetPaginationWithRouter = () => {
  const { t } = useTranslate('common');
  const {
    setPaginationParams,
    page,
    size: pageSize,
  } = useSetPaginationParams();

  const onPageChange: PaginationProps['onChange'] = useCallback(
    (pageNumber: number, pageSize: number) => {
      setPaginationParams(pageNumber, pageSize);
    },
    [setPaginationParams],
  );

  const setCurrentPagination = useCallback(
    (pagination: { page: number; pageSize?: number }) => {
      setPaginationParams(pagination.page, pagination.pageSize);
    },
    [setPaginationParams],
  );

  const pagination: PaginationProps = useMemo(() => {
    return {
      showQuickJumper: true,
      total: 0,
      showSizeChanger: true,
      current: page,
      pageSize: pageSize,
      pageSizeOptions: [1, 2, 10, 20, 50, 100],
      onChange: onPageChange,
      showTotal: (total) => `${t('total')} ${total}`,
    };
  }, [t, onPageChange, page, pageSize]);

  return {
    pagination,
    setPagination: setCurrentPagination,
  };
};

export const useGetPagination = () => {
  const [pagination, setPagination] = useState({ page: 1, pageSize: 10 });
  const { t } = useTranslate('common');

  const onPageChange: PaginationProps['onChange'] = useCallback(
    (pageNumber: number, pageSize: number) => {
      setPagination({ page: pageNumber, pageSize });
    },
    [],
  );

  const currentPagination: PaginationProps = useMemo(() => {
    return {
      showQuickJumper: true,
      total: 0,
      showSizeChanger: true,
      current: pagination.page,
      pageSize: pagination.pageSize,
      pageSizeOptions: [1, 2, 10, 20, 50, 100],
      onChange: onPageChange,
      showTotal: (total) => `${t('total')} ${total}`,
    };
  }, [t, onPageChange, pagination]);

  return {
    pagination: currentPagination,
  };
};

export const useSetPagination = (namespace: string) => {
  const dispatch = useDispatch();

  const setPagination = useCallback(
    (pageNumber = 1, pageSize?: number) => {
      const pagination: Pagination = {
        current: pageNumber,
      } as Pagination;
      if (pageSize) {
        pagination.pageSize = pageSize;
      }
      dispatch({
        type: `${namespace}/setPagination`,
        payload: pagination,
      });
    },
    [dispatch, namespace],
  );

  return setPagination;
};

export interface AppConf {
  appName: string;
}

export const useFetchAppConf = () => {
  const [appConf, setAppConf] = useState<AppConf>({} as AppConf);
  const fetchAppConf = useCallback(async () => {
    const ret = await axios.get('/conf.json');

    setAppConf(ret.data);
  }, []);

  useEffect(() => {
    fetchAppConf();
  }, [fetchAppConf]);

  return appConf;
};

export const useSendMessageWithSse = (
  url: string = api.completeConversation,
) => {
  const [answer, setAnswer] = useState<IAnswer>({} as IAnswer);
  const [done, setDone] = useState(true);

  const send = useCallback(
    async (
      body: any,
    ): Promise<{ response: Response; data: ResponseType } | undefined> => {
      try {
        setDone(false);
        const response = await fetch(url, {
          method: 'POST',
          headers: {
            [Authorization]: getAuthorization(),
            'Content-Type': 'application/json',
          },
          body: JSON.stringify(body),
        });

        const res = response.clone().json();

        const reader = response?.body
          ?.pipeThrough(new TextDecoderStream())
          .pipeThrough(new EventSourceParserStream())
          .getReader();

        while (true) {
          const x = await reader?.read();
          if (x) {
            const { done, value } = x;
            try {
              const val = JSON.parse(value?.data || '');
              const d = val?.data;
              if (typeof d !== 'boolean') {
                // console.info('data:', d);
                setAnswer({
                  ...d,
                  conversationId: body?.conversation_id,
                });
              }
            } catch (e) {
              console.warn(e);
            }
            if (done) {
              console.info('done');
              break;
            }
          }
        }
        console.info('done?');
        setDone(true);
        setAnswer({} as IAnswer);
        return { data: await res, response };
      } catch (e) {
        setDone(true);
        setAnswer({} as IAnswer);
        console.warn(e);
      }
    },
    [url],
  );

  return { send, answer, done, setDone };
};

//#region chat hooks

export const useScrollToBottom = (messages?: unknown) => {
  const ref = useRef<HTMLDivElement>(null);

  const scrollToBottom = useCallback(() => {
    if (messages) {
      ref.current?.scrollIntoView({ behavior: 'instant' });
    }
  }, [messages]); // If the message changes, scroll to the bottom

  useEffect(() => {
    scrollToBottom();
  }, [scrollToBottom]);

  return ref;
};

export const useHandleMessageInputChange = () => {
  const [value, setValue] = useState('');

  const handleInputChange: ChangeEventHandler<HTMLInputElement> = (e) => {
    const value = e.target.value;
    const nextValue = value.replaceAll('\\n', '\n').replaceAll('\\t', '\t');
    setValue(nextValue);
  };

  return {
    handleInputChange,
    value,
    setValue,
  };
};

export const useSelectDerivedMessages = () => {
  const [derivedMessages, setDerivedMessages] = useState<IMessage[]>([]);

  const ref = useScrollToBottom(derivedMessages);

  const addNewestQuestion = useCallback(
    (message: Message, answer: string = '') => {
      setDerivedMessages((pre) => {
        return [
          ...pre,
          {
            ...message,
            id: buildMessageUuid(message),
          },
          {
            role: MessageType.Assistant,
            content: answer,
            id: buildMessageUuid({ ...message, role: MessageType.Assistant }),
          },
        ];
      });
    },
    [],
  );

  // Add the streaming message to the last item in the message list
  const addNewestAnswer = useCallback((answer: IAnswer) => {
    setDerivedMessages((pre) => {
      return [
        ...(pre?.slice(0, -1) ?? []),
        {
          role: MessageType.Assistant,
          content: answer.answer,
          reference: answer.reference,
          id: buildMessageUuid({
            id: answer.id,
            role: MessageType.Assistant,
          }),
          prompt: answer.prompt,
        },
      ];
    });
  }, []);

  const removeLatestMessage = useCallback(() => {
    setDerivedMessages((pre) => {
      const nextMessages = pre?.slice(0, -2) ?? [];
      return nextMessages;
    });
  }, []);

  const removeMessageById = useCallback(
    (messageId: string) => {
      setDerivedMessages((pre) => {
        const nextMessages =
          pre?.filter(
            (x) => getMessagePureId(x.id) !== getMessagePureId(messageId),
          ) ?? [];
        return nextMessages;
      });
    },
    [setDerivedMessages],
  );

  const removeMessagesAfterCurrentMessage = useCallback(
    (messageId: string) => {
      setDerivedMessages((pre) => {
        const index = pre.findIndex((x) => x.id === messageId);
        if (index !== -1) {
          let nextMessages = pre.slice(0, index + 2) ?? [];
          const latestMessage = nextMessages.at(-1);
          nextMessages = latestMessage
            ? [
                ...nextMessages.slice(0, -1),
                {
                  ...latestMessage,
                  content: '',
                  reference: undefined,
                  prompt: undefined,
                },
              ]
            : nextMessages;
          return nextMessages;
        }
        return pre;
      });
    },
    [setDerivedMessages],
  );

  return {
    ref,
    derivedMessages,
    setDerivedMessages,
    addNewestQuestion,
    addNewestAnswer,
    removeLatestMessage,
    removeMessageById,
    removeMessagesAfterCurrentMessage,
  };
};

export interface IRemoveMessageById {
  removeMessageById(messageId: string): void;
}

export const useRemoveMessageById = (
  setCurrentConversation: (
    callback: (state: IClientConversation) => IClientConversation,
  ) => void,
) => {
  const removeMessageById = useCallback(
    (messageId: string) => {
      setCurrentConversation((pre) => {
        const nextMessages =
          pre.message?.filter(
            (x) => getMessagePureId(x.id) !== getMessagePureId(messageId),
          ) ?? [];
        return {
          ...pre,
          message: nextMessages,
        };
      });
    },
    [setCurrentConversation],
  );

  return { removeMessageById };
};

export const useRemoveMessagesAfterCurrentMessage = (
  setCurrentConversation: (
    callback: (state: IClientConversation) => IClientConversation,
  ) => void,
) => {
  const removeMessagesAfterCurrentMessage = useCallback(
    (messageId: string) => {
      setCurrentConversation((pre) => {
        const index = pre.message?.findIndex((x) => x.id === messageId);
        if (index !== -1) {
          let nextMessages = pre.message?.slice(0, index + 2) ?? [];
          const latestMessage = nextMessages.at(-1);
          nextMessages = latestMessage
            ? [
                ...nextMessages.slice(0, -1),
                {
                  ...latestMessage,
                  content: '',
                  reference: undefined,
                  prompt: undefined,
                },
              ]
            : nextMessages;
          return {
            ...pre,
            message: nextMessages,
          };
        }
        return pre;
      });
    },
    [setCurrentConversation],
  );

  return { removeMessagesAfterCurrentMessage };
};

export interface IRegenerateMessage {
  regenerateMessage?: (message: Message) => void;
}

export const useRegenerateMessage = ({
  removeMessagesAfterCurrentMessage,
  sendMessage,
  messages,
}: {
  removeMessagesAfterCurrentMessage(messageId: string): void;
  sendMessage({
    message,
  }: {
    message: Message;
    messages?: Message[];
  }): void | Promise<any>;
  messages: Message[];
}) => {
  const regenerateMessage = useCallback(
    async (message: Message) => {
      if (message.id) {
        removeMessagesAfterCurrentMessage(message.id);
        const index = messages.findIndex((x) => x.id === message.id);
        let nextMessages;
        if (index !== -1) {
          nextMessages = messages.slice(0, index);
        }
        sendMessage({
          message: { ...message, id: uuid() },
          messages: nextMessages,
        });
      }
    },
    [removeMessagesAfterCurrentMessage, sendMessage, messages],
  );

  return { regenerateMessage };
};

// #endregion

/**
 *
 * @param defaultId
 * used to switch between different items, similar to radio
 * @returns
 */
export const useSelectItem = (defaultId?: string) => {
  const [selectedId, setSelectedId] = useState('');

  const handleItemClick = useCallback(
    (id: string) => () => {
      setSelectedId(id);
    },
    [],
  );

  useEffect(() => {
    if (defaultId) {
      setSelectedId(defaultId);
    }
  }, [defaultId]);

  return { selectedId, handleItemClick };
};

export const useFetchModelId = () => {
  const { data: tenantInfo } = useFetchTenantInfo();

  return tenantInfo?.llm_id ?? '';
};

const ChunkTokenNumMap = {
  naive: 128,
  knowledge_graph: 8192,
};

export const useHandleChunkMethodSelectChange = (form: FormInstance) => {
  // const form = Form.useFormInstance();
  const handleChange = useCallback(
    (value: string) => {
      if (value in ChunkTokenNumMap) {
        form.setFieldValue(
          ['parser_config', 'chunk_token_num'],
          ChunkTokenNumMap[value as keyof typeof ChunkTokenNumMap],
        );
      }
    },
    [form],
  );

  return handleChange;
};