import React, { useRef } from 'react';
import { CircularProgress } from '@mui/material';
import ChatHeader from './chat-header/component';
import { layoutSelect, layoutSelectInput } from '../../layout/context';
import { Input, Layout } from '../../layout/layoutTypes';
import Styled from './styles';
import ChatMessageListContainer from './chat-message-list/component';
import ChatMessageFormContainer from './chat-message-form/component';
import ChatTypingIndicatorContainer from './chat-typing-indicator/component';
import { PANELS, ACTIONS } from '/imports/ui/components/layout/enums';
import usePendingChat from '/imports/ui/core/local-states/usePendingChat';
import useChat from '/imports/ui/core/hooks/useChat';
import { Chat as ChatType } from '/imports/ui/Types/chat';
import { layoutDispatch } from '/imports/ui/components/layout/context';
import browserInfo from '/imports/utils/browserInfo';
import { GraphqlDataHookSubscriptionResponse } from '/imports/ui/Types/hook';
import { ChatEvents } from '/imports/ui/core/enums/chat';

interface ChatProps {
  isRTL: boolean;
}

const Chat: React.FC<ChatProps> = ({ isRTL }) => {
  const { isChrome } = browserInfo;
  const isEditingMessage = useRef(false);

  React.useEffect(() => {
    const handleMouseDown = () => {
      if (window.getSelection) {
        const selection = window.getSelection();
        if (selection) {
          selection.removeAllRanges();
        }
      }
    };

    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape' && isEditingMessage.current) {
        window.dispatchEvent(
          new CustomEvent(ChatEvents.CHAT_CANCEL_EDIT_REQUEST),
        );
      }
    };

    const handleEditingMessage = (e: Event) => {
      if (e instanceof CustomEvent) {
        isEditingMessage.current = true;
      }
    };

    const handleCancelEditingMessage = (e: Event) => {
      if (e instanceof CustomEvent) {
        isEditingMessage.current = false;
      }
    };

    document.addEventListener('mousedown', handleMouseDown);
    document.addEventListener('keydown', handleKeyDown);
    window.addEventListener(ChatEvents.CHAT_EDIT_REQUEST, handleEditingMessage);
    window.addEventListener(ChatEvents.CHAT_CANCEL_EDIT_REQUEST, handleCancelEditingMessage);

    return () => {
      document.removeEventListener('mousedown', handleMouseDown);
      document.removeEventListener('keydown', handleKeyDown);
      window.removeEventListener(ChatEvents.CHAT_EDIT_REQUEST, handleEditingMessage);
      window.removeEventListener(ChatEvents.CHAT_CANCEL_EDIT_REQUEST, handleCancelEditingMessage);
    };
  }, []);

  return (
    <Styled.Chat isRTL={isRTL} isChrome={isChrome}>
      <ChatHeader />
      <ChatMessageListContainer />
      <ChatMessageFormContainer />
      <ChatTypingIndicatorContainer />
    </Styled.Chat>
  );
};
export const ChatLoading: React.FC<ChatProps> = ({ isRTL }) => {
  const { isChrome } = browserInfo;
  return (
    <Styled.Chat isRTL={isRTL} isChrome={isChrome}>
      <CircularProgress style={{ alignSelf: 'center' }} />
    </Styled.Chat>
  );
};

const ChatContainer: React.FC = () => {
  const idChatOpen = layoutSelect((i: Layout) => i.idChatOpen);
  const isRTL = layoutSelect((i: Layout) => i.isRTL);
  const sidebarContent = layoutSelectInput((i: Input) => i.sidebarContent);
  const layoutContextDispatch = layoutDispatch();
  const { data: chats } = useChat((chat) => {
    return {
      chatId: chat.chatId,
      participant: chat.participant,
    };
  }) as GraphqlDataHookSubscriptionResponse<Partial<ChatType>[]>;

  const [pendingChat, setPendingChat] = usePendingChat();

  if (pendingChat && chats) {
    const chat = chats.find((c) => {
      return c.participant?.userId === pendingChat;
    });
    if (chat) {
      setPendingChat('');
      layoutContextDispatch({
        type: ACTIONS.SET_ID_CHAT_OPEN,
        value: chat.chatId,
      });
    }
  }

  if (sidebarContent.sidebarContentPanel !== PANELS.CHAT) return null;
  if (!idChatOpen) return <ChatLoading isRTL={isRTL} />;
  return <Chat isRTL={isRTL} />;
};

export default ChatContainer;