quivr/frontend/app/chat/[chatId]/hooks/useChat.ts

/* eslint-disable max-lines */
import { AxiosError } from 'axios';
import { useParams } from 'next/navigation';
import { useState } from 'react';
import { useTranslation } from 'react-i18next';

import { getChatConfigFromLocalStorage } from '@/lib/api/chat/chat.local';
import { useChatApi } from '@/lib/api/chat/useChatApi';
import { useBrainContext } from '@/lib/context/BrainProvider/hooks/useBrainContext';
import { useChatContext } from '@/lib/context/ChatProvider/hooks/useChatContext';
import { useToast } from '@/lib/hooks';
import { useEventTracking } from '@/services/analytics/useEventTracking';

import { useQuestion } from './useQuestion';
import { ChatQuestion } from '../types';

// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
export const useChat = () => {
  const { track } = useEventTracking();
  const params = useParams();
  const [chatId, setChatId] = useState<string | undefined>(
    params?.chatId as string | undefined
  );
  const [generatingAnswer, setGeneratingAnswer] = useState(false);

  const { history } = useChatContext();
  const { currentBrain } = useBrainContext();
  const { publish } = useToast();
  const { createChat } = useChatApi();

  const { addStreamQuestion } = useQuestion();
  const { t } = useTranslation(['chat']);

  const addQuestion = async (question: string, callback?: () => void) => {
    try {
      setGeneratingAnswer(true);

      let currentChatId = chatId;

      //if chatId is not set, create a new chat. Chat name is from the first question
      if (currentChatId === undefined) {
        const chatName = question.split(' ').slice(0, 3).join(' ');
        const chat = await createChat(chatName);
        currentChatId = chat.chat_id;
        setChatId(currentChatId);
      }

      void track('QUESTION_ASKED');
      const chatConfig = getChatConfigFromLocalStorage(currentChatId);

      const chatQuestion: ChatQuestion = {
        model: chatConfig?.model,
        question,
        temperature: chatConfig?.temperature,
        max_tokens: chatConfig?.maxTokens,
        brain_id: currentBrain?.id,
      };

      await addStreamQuestion(currentChatId, chatQuestion);

      callback?.();
    } catch (error) {
      console.error({ error });

      if ((error as AxiosError).response?.status === 429) {
        publish({
          variant: 'danger',
          text: t('limit_reached', { ns: 'chat' }),
        });

        return;
      }

      publish({
        variant: 'danger',
        text: t('error_occurred', { ns: 'chat' }),
      });
    } finally {
      setGeneratingAnswer(false);
    }
  };

  return {
    history,
    addQuestion,
    generatingAnswer,
    chatId,
  };
};