import { useEffect, useRef } from 'react'
import { MessageBubble } from './MessageBubble'
import type { ChatMessage } from '../../types/protocol'
import { Sparkles } from 'lucide-react'

interface MessageListProps {
  messages: ChatMessage[]
  onNavigateToSubAgent?: (taskId: string, description: string) => void
}

export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps) {
  const bottomRef = useRef<HTMLDivElement>(null)
  const containerRef = useRef<HTMLDivElement>(null)

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

  if (messages.length === 0) {
    return (
      <div className="flex h-full items-center justify-center">
        <div className="text-center animate-fade-in">
          <div className="mb-6 inline-flex h-20 w-20 items-center justify-center rounded-full bg-gradient-to-br from-[#00f0ff]/20 to-[#3b82f6]/20 shadow-2xl shadow-[#00f0ff]/20">
            <Sparkles className="h-10 w-10 text-[#00f0ff]" />
          </div>
          <h2 className="mb-2 text-2xl font-bold text-white">开始新的对话</h2>
          <p className="text-zinc-500">在下方输入消息开始与 AI 助手聊天</p>
          <div className="mt-8 flex items-center justify-center gap-4 text-sm text-zinc-600">
            <span className="px-3 py-1 rounded-full bg-zinc-800/50 border border-zinc-700">/new 创建话题</span>
            <span className="px-3 py-1 rounded-full bg-zinc-800/50 border border-zinc-700">/list 查看列表</span>
          </div>
        </div>
      </div>
    )
  }

  return (
    <div
      ref={containerRef}
      className="h-full overflow-y-auto p-6 space-y-6"
    >
      {messages.map((message) => (
        <MessageBubble key={message.id} message={message} onNavigateToSubAgent={onNavigateToSubAgent} />
      ))}
      <div ref={bottomRef} />
    </div>
  )
}