frontend/src/components/ai-tutor/ChatInterface.tsx

import React, { useState } from 'react';
import { Card, CardContent } from '@/components/ui/card';
import TutorAvatar from './TutorAvatar';
import MessageBubble from './MessageBubble';

const ChatInterface = () => {
  const [messages, setMessages] = useState([]);
  const [input, setInput] = useState('');
  const [tutorState, setTutorState] = useState('neutral');

  const handleSendMessage = async () => {
    if (!input.trim()) return;

    const newMessage = {
      role: 'user',
      content: input,
      timestamp: new Date().toISOString()
    };

    setMessages(prev => [...prev, newMessage]);
    setInput('');
    setTutorState('thinking');

    try {
      const response = await fetch('/api/chat', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: input })
      });

      const data = await response.json();
      
      setMessages(prev => [...prev, {
        role: 'assistant',
        content: data.response,
        timestamp: new Date().toISOString()
      }]);
      
      setTutorState('happy');
    } catch (error) {
      console.error('Chat error:', error);
      setTutorState('neutral');
    }
  };

  return (
    <Card className="h-[600px] flex flex-col">
      <CardContent className="flex-1 flex flex-col p-4">
        <TutorAvatar state={tutorState} />
        
        <div className="flex-1 overflow-y-auto mb-4 space-y-4">
          {messages.map((msg, idx) => (
            <MessageBubble key={idx} {...msg} />
          ))}
        </div>

        <div className="flex gap-2 mt-auto">
          <input
            type="text"
            value={input}
            onChange={(e) => setInput(e.target.value)}
            onKeyPress={(e) => e.key === 'Enter' && handleSendMessage()}
            placeholder="Ask your question..."
            className="flex-1 p-2 border rounded"
          />
          <button
            onClick={handleSendMessage}
            className="bg-blue-500 text-white px-4 py-2 rounded hover:bg-blue-600"
          >
            Send
          </button>
        </div>
      </CardContent>
    </Card>
  );
};

export default ChatInterface;