frontend/src/components/interview/ChatWindow.tsx

import { useEffect, useRef } from 'react'
import type { Message } from '../../types'
import MessageBubble from './MessageBubble'

interface Props {
  messages: Message[]
  loading: boolean
}

export default function ChatWindow({ messages, loading }: Props) {
  const bottomRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    bottomRef.current?.scrollIntoView({ behavior: 'smooth' })
  }, [messages, loading])

  return (
    <div className="flex-1 overflow-y-auto px-4 py-4 space-y-3">
      {messages.map((msg, i) => (
        <MessageBubble key={i} message={msg} />
      ))}
      {loading && (
        <div className="flex justify-start">
          <div className="bg-gray-800 rounded-2xl rounded-tl-sm px-4 py-3 flex gap-1 items-center">
            <span className="w-2 h-2 bg-gray-400 rounded-full animate-bounce [animation-delay:0ms]" />
            <span className="w-2 h-2 bg-gray-400 rounded-full animate-bounce [animation-delay:150ms]" />
            <span className="w-2 h-2 bg-gray-400 rounded-full animate-bounce [animation-delay:300ms]" />
          </div>
        </div>
      )}
      <div ref={bottomRef} />
    </div>
  )
}