import React, { useEffect, useRef, useState } from "react";

import ProfileHeader from "./ProfileHeader";
import ChatArea from "./ChatArea";
import InputArea from "./InputArea";
import PresetQuestions from "./PresetQuestions";

import * as S from "./ChatContainer.style";
import MessageManager from "../store/MessageManager";

const ChatContainer = ({ config, handleSendMessage }) => {
  const { initialMessages, profileConfig, presetQuestions } = config;
  const chatAreaRef = useRef(null);

  const [messages, setMessages] = useState([]);
  const messageManager = MessageManager.getInstance(initialMessages);
  const scrollToBottom = () => {
    if (chatAreaRef.current) {
      chatAreaRef.current.scrollTop = chatAreaRef.current.scrollHeight;
    }
  };

  useEffect(() => {
    scrollToBottom();
  }, []);

  useEffect(() => {
    const observer = {
      update: () => {
        setMessages([...messageManager.getMessages()]);
      },
    };
    // 컴포넌트가 마운트될 때 Observer를 구독
    messageManager.subscribe(observer);

    messageManager.initMessages(initialMessages);

    // 컴포넌트가 언마운트될 때 Observer를 구독 해제
    return () => {
      messageManager.unsubscribe(observer);
    };
  }, []);

  return (
    <S.Container theme={profileConfig.theme}>
      <ProfileHeader config={profileConfig} />
      <ChatArea
        theme={profileConfig.theme}
        initialImage={profileConfig.profileImage}
        handleThumbUp={profileConfig?.handleThumbUp}
        handleThumbDown={profileConfig?.handleThumbDown}
        useRef={chatAreaRef}
        messages={messages}
        scrollToBottom={scrollToBottom}
      />
      {presetQuestions && (
        <PresetQuestions
          theme={profileConfig.theme}
          questions={presetQuestions}
        />
      )}
      <InputArea
        theme={profileConfig.theme}
        scrollToBottom={scrollToBottom}
        handleSendMessagae={handleSendMessage}
      />
    </S.Container>
  );
};
export default ChatContainer;