lib/hooks/useChatWithMedia.ts

import { useChat, type Message } from 'ai/react';
import { toast } from 'react-hot-toast';
import { useEffect, useState } from 'react';
import { MediaDetails } from '../fetch';
import { MessageWithSelectedDataset } from '../types';

const useChatWithMedia = (mediaList: MediaDetails[]) => {
  const {
    messages,
    append,
    reload,
    stop,
    isLoading,
    input,
    setInput,
    setMessages,
  } = useChat({
    sendExtraMessageFields: true,
    onResponse(response) {
      if (response.status !== 200) {
        toast.error(response.statusText);
      }
    },
    initialMessages: [
      {
        id: 'system',
        content: `For the full conversation, user have provided the following images: ${mediaList.map(media => media.name)}. Please help reply to user regarding these images`,
        dataset: mediaList,
        role: 'system',
      },
    ] as MessageWithSelectedDataset[],
  });

  const [loadingDots, setLoadingDots] = useState('');

  useEffect(() => {
    let loadingInterval: NodeJS.Timeout;

    if (isLoading) {
      loadingInterval = setInterval(() => {
        setLoadingDots(prevMessage => {
          switch (prevMessage) {
            case '':
              return '.';
            case '.':
              return '..';
            case '..':
              return '...';
            case '...':
              return '';
            default:
              return '';
          }
        });
      }, 500);
    }

    return () => {
      clearInterval(loadingInterval);
    };
  }, [isLoading]);

  const assistantLoadingMessage = {
    id: 'loading',
    content: loadingDots,
    role: 'assistant',
  };

  const messageWithLoading =
    isLoading &&
    messages.length &&
    messages[messages.length - 1].role !== 'assistant'
      ? [...messages, assistantLoadingMessage]
      : messages;

  return {
    messages: messageWithLoading as MessageWithSelectedDataset[],
    append,
    reload,
    stop,
    isLoading,
    input,
    setInput,
  };
};

export default useChatWithMedia;