import { useCallback, useState } from 'react';
import { useQueryClient } from '@tanstack/react-query';
import { QueryKeys } from 'librechat-data-provider';
import { useRecoilState, useResetRecoilState, useSetRecoilState } from 'recoil';
import { useGetMessagesByConvoId } from 'librechat-data-provider/react-query';
import type { TMessage } from 'librechat-data-provider';
import useChatFunctions from '~/hooks/Chat/useChatFunctions';
import { useAuthContext } from '~/hooks/AuthContext';
import useNewConvo from '~/hooks/useNewConvo';
import store from '~/store';

// this to be set somewhere else
export default function useChatHelpers(index = 0, paramId?: string) {
  const clearAllSubmissions = store.useClearSubmissionState();
  const [files, setFiles] = useRecoilState(store.filesByIndex(index));
  const [filesLoading, setFilesLoading] = useState(false);

  const queryClient = useQueryClient();
  const { isAuthenticated } = useAuthContext();

  const { newConversation } = useNewConvo(index);
  const { useCreateConversationAtom } = store;
  const { conversation, setConversation } = useCreateConversationAtom(index);
  const { conversationId } = conversation ?? {};

  const queryParam = paramId === 'new' ? paramId : conversationId ?? paramId ?? '';

  /* Messages: here simply to fetch, don't export and use `getMessages()` instead */
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  const { data: _messages } = useGetMessagesByConvoId(conversationId ?? '', {
    enabled: isAuthenticated,
  });

  const resetLatestMessage = useResetRecoilState(store.latestMessageFamily(index));
  const [isSubmitting, setIsSubmitting] = useRecoilState(store.isSubmittingFamily(index));
  const [latestMessage, setLatestMessage] = useRecoilState(store.latestMessageFamily(index));
  const setSiblingIdx = useSetRecoilState(
    store.messagesSiblingIdxFamily(latestMessage?.parentMessageId ?? null),
  );

  const setMessages = useCallback(
    (messages: TMessage[]) => {
      queryClient.setQueryData<TMessage[]>([QueryKeys.messages, queryParam], messages);
      if (queryParam === 'new') {
        queryClient.setQueryData<TMessage[]>([QueryKeys.messages, conversationId], messages);
      }
    },
    [queryParam, queryClient, conversationId],
  );

  const getMessages = useCallback(() => {
    return queryClient.getQueryData<TMessage[]>([QueryKeys.messages, queryParam]);
  }, [queryParam, queryClient]);

  /* Conversation */
  // const setActiveConvos = useSetRecoilState(store.activeConversations);

  // const setConversation = useCallback(
  //   (convoUpdate: TConversation) => {
  //     _setConversation(prev => {
  //       const { conversationId: convoId } = prev ?? { conversationId: null };
  //       const { conversationId: currentId } = convoUpdate;
  //       if (currentId && convoId && convoId !== 'new' && convoId !== currentId) {
  //         // for now, we delete the prev convoId from activeConversations
  //         const newActiveConvos = { [currentId]: true };
  //         setActiveConvos(newActiveConvos);
  //       }
  //       return convoUpdate;
  //     });
  //   },
  //   [_setConversation, setActiveConvos],
  // );

  const setSubmission = useSetRecoilState(store.submissionByIndex(index));

  const { ask, regenerate } = useChatFunctions({
    index,
    files,
    setFiles,
    getMessages,
    setMessages,
    isSubmitting,
    conversation,
    latestMessage,
    setSubmission,
    setLatestMessage,
  });

  const continueGeneration = () => {
    if (!latestMessage) {
      console.error('Failed to regenerate the message: latestMessage not found.');
      return;
    }

    const messages = getMessages();

    const parentMessage = messages?.find(
      (element) => element.messageId == latestMessage.parentMessageId,
    );

    if (parentMessage && parentMessage.isCreatedByUser) {
      ask({ ...parentMessage }, { isContinued: true, isRegenerate: true, isEdited: true });
    } else {
      console.error(
        'Failed to regenerate the message: parentMessage not found, or not created by user.',
      );
    }
  };

  const stopGenerating = () => clearAllSubmissions();

  const handleStopGenerating = (e: React.MouseEvent<HTMLButtonElement>) => {
    e.preventDefault();
    stopGenerating();
  };

  const handleRegenerate = (e: React.MouseEvent<HTMLButtonElement>) => {
    e.preventDefault();
    const parentMessageId = latestMessage?.parentMessageId;
    if (!parentMessageId) {
      console.error('Failed to regenerate the message: parentMessageId not found.');
      return;
    }
    regenerate({ parentMessageId });
  };

  const handleContinue = (e: React.MouseEvent<HTMLButtonElement>) => {
    e.preventDefault();
    continueGeneration();
    setSiblingIdx(0);
  };

  const [showBingToneSetting, setShowBingToneSetting] = useRecoilState(
    store.showBingToneSettingFamily(index),
  );
  const [showPopover, setShowPopover] = useRecoilState(store.showPopoverFamily(index));
  const [abortScroll, setAbortScroll] = useRecoilState(store.abortScrollFamily(index));
  const [preset, setPreset] = useRecoilState(store.presetByIndex(index));
  const [optionSettings, setOptionSettings] = useRecoilState(store.optionSettingsFamily(index));
  const [showAgentSettings, setShowAgentSettings] = useRecoilState(
    store.showAgentSettingsFamily(index),
  );

  return {
    newConversation,
    conversation,
    setConversation,
    // getConvos,
    // setConvos,
    isSubmitting,
    setIsSubmitting,
    getMessages,
    setMessages,
    setSiblingIdx,
    latestMessage,
    setLatestMessage,
    resetLatestMessage,
    ask,
    index,
    regenerate,
    stopGenerating,
    handleStopGenerating,
    handleRegenerate,
    handleContinue,
    showPopover,
    setShowPopover,
    abortScroll,
    setAbortScroll,
    showBingToneSetting,
    setShowBingToneSetting,
    preset,
    setPreset,
    optionSettings,
    setOptionSettings,
    showAgentSettings,
    setShowAgentSettings,
    files,
    setFiles,
    filesLoading,
    setFilesLoading,
  };
}