frontend/src/components/ChatHistory.tsx

"use client";
import { useChatContext } from "@/lib/store/ChatContext";
import { Message as MessageType } from "@/lib/types";
import React, { useEffect, useRef } from "react";
import Message from "./Message";

interface ChatHistoryProps {
  messages: MessageType[];
  isLoading: boolean;
  connectionMode: "agent" | "workflow";
}

// Traditional prop-based component
const ChatHistory: React.FC<ChatHistoryProps> = ({ messages, isLoading, connectionMode }) => {
  const messagesEndRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
  }, [messages]);

  return (
    <div className="pb-24 overflow-auto focus-visible:outline-0" tabIndex={-1}>
      {messages.length === 0 ? (
        <div className="h-full flex flex-col items-center justify-center p-8 text-center">
          <div className="max-w-md space-y-2">
            <h2 className="text-2xl font-bold">Welcome to the KNet demo</h2>
            <p className="text-muted-foreground">Ask any research question to get started. The assistant will provide detailed answers backed by research and sources.</p>
          </div>
        </div>
      ) : (
        messages.map((message, index) => {
          const isLast = index === messages.length - 1;
          return <Message key={message.id} message={message} isLoading={isLast && isLoading} connectionMode={connectionMode} />;
        })
      )}

      <div ref={messagesEndRef} />
    </div>
  );
};

// Context-based component
export const ChatHistoryWithContext: React.FC = () => {
  const { chatState, connectionMode } = useChatContext();
  return <ChatHistory messages={chatState.messages} isLoading={chatState.isLoading} connectionMode={connectionMode} />;
};

export default ChatHistory;