import { useCallback, useContext } from 'react';
import { useRecoilValue, useResetRecoilState, useSetRecoilState } from 'recoil';
import {
  actionState,
  askUserState,
  chatSettingsInputsState,
  chatSettingsValueState,
  currentThreadIdState,
  elementState,
  favoriteMessagesState,
  firstUserInteraction,
  loadingState,
  messagesState,
  sessionIdState,
  sessionState,
  sideViewState,
  tasklistState,
  threadIdToResumeState,
  tokenCountState
} from 'src/state';
import { IFileRef, IStep } from 'src/types';
import { addMessage } from 'src/utils/message';
import { v4 as uuidv4 } from 'uuid';

import { ChainlitContext } from './context';

type PartialBy<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;

const useChatInteract = () => {
  const client = useContext(ChainlitContext);
  const session = useRecoilValue(sessionState);
  const askUser = useRecoilValue(askUserState);
  const sessionId = useRecoilValue(sessionIdState);

  const resetChatSettings = useResetRecoilState(chatSettingsInputsState);
  const resetSessionId = useResetRecoilState(sessionIdState);
  const resetChatSettingsValue = useResetRecoilState(chatSettingsValueState);

  const setFirstUserInteraction = useSetRecoilState(firstUserInteraction);
  const setLoading = useSetRecoilState(loadingState);
  const setMessages = useSetRecoilState(messagesState);
  const setElements = useSetRecoilState(elementState);
  const setTasklists = useSetRecoilState(tasklistState);
  const setActions = useSetRecoilState(actionState);
  const setTokenCount = useSetRecoilState(tokenCountState);
  const setIdToResume = useSetRecoilState(threadIdToResumeState);
  const setSideView = useSetRecoilState(sideViewState);
  const setCurrentThreadId = useSetRecoilState(currentThreadIdState);
  const setFavoriteMessages = useSetRecoilState(favoriteMessagesState);

  const clear = useCallback(() => {
    session?.socket.emit('clear_session');
    session?.socket.disconnect();
    setIdToResume(undefined);
    resetSessionId();
    setFirstUserInteraction(undefined);
    setMessages([]);
    setElements([]);
    setTasklists([]);
    setActions([]);
    setTokenCount(0);
    resetChatSettings();
    resetChatSettingsValue();
    setSideView(undefined);
    setCurrentThreadId(undefined);
  }, [session]);

  const sendMessage = useCallback(
    (
      message: PartialBy<IStep, 'createdAt' | 'id'>,
      fileReferences: IFileRef[] = []
    ) => {
      if (!message.id) {
        message.id = uuidv4();
      }
      if (!message.createdAt) {
        message.createdAt = new Date().toISOString();
      }
      setMessages((oldMessages) => addMessage(oldMessages, message as IStep));

      session?.socket.emit('client_message', { message, fileReferences });
    },
    [session?.socket]
  );

  const editMessage = useCallback(
    (message: IStep) => {
      session?.socket.emit('edit_message', { message });
    },
    [session?.socket]
  );

  const toggleMessageFavorite = useCallback(
    (message: IStep) => {
      const favorite = !(message.metadata?.favorite ?? false);
      const updatedMetadata = {
        ...(message.metadata || {}),
        favorite
      };

      setMessages((oldMessages) =>
        oldMessages.map((item) =>
          item.id === message.id
            ? { ...item, metadata: { ...(item.metadata || {}), favorite } }
            : item
        )
      );

      const nextMessage: IStep = {
        ...message,
        metadata: updatedMetadata
      };

      setFavoriteMessages((oldFavorites) => {
        if (favorite) {
          const filtered = oldFavorites.filter(
            (step) => step.id !== message.id
          );
          return [nextMessage, ...filtered];
        }
        return oldFavorites.filter((step) => step.id !== message.id);
      });

      session?.socket.emit('message_favorite', { message: nextMessage });
    },
    [session?.socket, setFavoriteMessages, setMessages]
  );

  const windowMessage = useCallback(
    (data: any) => {
      session?.socket.emit('window_message', data);
    },
    [session?.socket]
  );

  const startAudioStream = useCallback(() => {
    session?.socket.emit('audio_start');
  }, [session?.socket]);

  const sendAudioChunk = useCallback(
    (
      isStart: boolean,
      mimeType: string,
      elapsedTime: number,
      data: Int16Array
    ) => {
      session?.socket.emit('audio_chunk', {
        isStart,
        mimeType,
        elapsedTime,
        data
      });
    },
    [session?.socket]
  );

  const endAudioStream = useCallback(() => {
    session?.socket.emit('audio_end');
  }, [session?.socket]);

  const replyMessage = useCallback(
    (message: IStep) => {
      if (askUser) {
        if (askUser.parentId) message.parentId = askUser.parentId;
        setMessages((oldMessages) => addMessage(oldMessages, message));
        askUser.callback(message);
      }
    },
    [askUser]
  );

  const updateChatSettings = useCallback(
    (values: object) => {
      session?.socket.emit('chat_settings_change', values);
    },
    [session?.socket]
  );

  const editChatSettings = useCallback(
    (values: object) => {
      session?.socket.emit('chat_settings_edit', values);
    },
    [session?.socket]
  );

  const stopTask = useCallback(() => {
    setMessages((oldMessages) =>
      oldMessages.map((m) => {
        m.streaming = false;
        return m;
      })
    );

    setLoading(false);

    session?.socket.emit('stop');
  }, [session?.socket]);

  const uploadFile = useCallback(
    (file: File, onProgress: (progress: number) => void, parentId?: string) => {
      return client.uploadFile(file, onProgress, sessionId, parentId);
    },
    [sessionId]
  );

  return {
    uploadFile,
    clear,
    replyMessage,
    sendMessage,
    editMessage,
    windowMessage,
    startAudioStream,
    sendAudioChunk,
    endAudioStream,
    stopTask,
    setIdToResume,
    updateChatSettings,
    editChatSettings,
    toggleMessageFavorite
  };
};

export { useChatInteract };