import React, { useState, useEffect } from 'react';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { Avatar } from 'lucide-react';

// AI Tutor Avatar Component
const TutorAvatar = ({ state = 'neutral', speaking = false }) => {
  const [isBlinking, setIsBlinking] = useState(false);

  useEffect(() => {
    const blinkInterval = setInterval(() => {
      setIsBlinking(true);
      setTimeout(() => setIsBlinking(false), 200);
    }, Math.random() * 4000 + 2000);
    
    return () => clearInterval(blinkInterval);
  }, []);

  return (
    <div className="flex justify-center items-center p-4">
      <svg
        viewBox="0 0 100 100"
        className="w-32 h-32 transition-transform duration-300 hover:scale-110"
      >
        {/* Avatar face */}
        <circle cx="50" cy="50" r="45" className="fill-blue-500" />
        
        {/* Eyes */}
        {isBlinking ? (
          <g>
            <line x1="30" y1="40" x2="40" y2="40" stroke="white" strokeWidth="3" />
            <line x1="60" y1="40" x2="70" y2="40" stroke="white" strokeWidth="3" />
          </g>
        ) : (
          <g>
            <circle cx="35" cy="40" r="5" fill="white" />
            <circle cx="65" cy="40" r="5" fill="white" />
          </g>
        )}
        
        {/* Mouth based on state */}
        <path
          d={
            state === 'happy'
              ? 'M 30 60 Q 50 80 70 60'
              : state === 'thinking'
              ? 'M 30 65 Q 50 65 70 65'
              : 'M 30 60 Q 50 70 70 60'
          }
          stroke="white"
          fill="none"
          strokeWidth="3"
          className={speaking ? 'animate-bounce' : ''}
        />
      </svg>
    </div>
  );
};

// Chat Message Component
const ChatMessage = ({ message, role }) => (
  <div className={`flex ${role === 'user' ? 'justify-end' : 'justify-start'} mb-4`}>
    <div className={`max-w-[80%] rounded-lg p-3 ${
      role === 'user' ? 'bg-blue-500 text-white' : 'bg-gray-100'
    }`}>
      {message}
    </div>
  </div>
);

// Learning Module Component
const LearningModule = ({ module, onComplete }) => (
  <Card className="mb-4">
    <CardHeader>
      <CardTitle>{module.name}</CardTitle>
    </CardHeader>
    <CardContent>
      <div className="prose dark:prose-invert">
        <div className="mb-4">
          <h4 className="font-semibold">Introduction</h4>
          <p>{module.content.introduction}</p>
        </div>
        
        <div className="mb-4">
          <h4 className="font-semibold">Key Points</h4>
          <ul>
            {module.content.key_points.map((point, idx) => (
              <li key={idx}>{point}</li>
            ))}
          </ul>
        </div>
        
        <div className="mb-4">
          <h4 className="font-semibold">Examples</h4>
          <ul>
            {module.content.examples.map((example, idx) => (
              <li key={idx}>{example}</li>
            ))}
          </ul>
        </div>
        
        <div className="mb-4">
          <h4 className="font-semibold">Practice Problems</h4>
          <ol>
            {module.content.practice_problems.map((problem, idx) => (
              <li key={idx}>{problem}</li>
            ))}
          </ol>
        </div>
        
        <button
          onClick={onComplete}
          className="bg-blue-500 text-white px-4 py-2 rounded hover:bg-blue-600 transition"
        >
          Mark as Complete
        </button>
      </div>
    </CardContent>
  </Card>
);

// Main App Component
const App = () => {
  const [activeTab, setActiveTab] = useState('learning');
  const [messages, setMessages] = useState([]);
  const [userInput, setUserInput] = useState('');
  const [tutorState, setTutorState] = useState('neutral');
  const [selectedPath, setSelectedPath] = useState(null);

  // Simulated learning paths data (would come from API)
  const learningPaths = {
    'physics_mechanics': {
      name: 'Classical Mechanics',
      // ... rest of the data structure
    },
    'ai_fundamentals': {
      name: 'AI Fundamentals',
      // ... rest of the data structure
    }
  };

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

    // Add user message
    setMessages(prev => [...prev, { role: 'user', content: userInput }]);
    setTutorState('thinking');

    try {
      // API call to get AI response
      const response = await fetch('/api/chat', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: userInput })
      });
      
      const data = await response.json();
      
      // Add AI response
      setMessages(prev => [...prev, { role: 'assistant', content: data.response }]);
      setTutorState('happy');
    } catch (error) {
      console.error('Error:', error);
      setTutorState('neutral');
    }

    setUserInput('');
  };

  return (
    <div className="min-h-screen bg-gray-50">
      <header className="bg-white shadow-sm">
        <div className="max-w-7xl mx-auto px-4 py-4">
          <h1 className="text-2xl font-bold text-gray-900">🎓 EduAI Platform</h1>
        </div>
      </header>

      <main className="max-w-7xl mx-auto px-4 py-6">
        <Tabs value={activeTab} onValueChange={setActiveTab}>
          <TabsList>
            <TabsTrigger value="learning">📚 Learning Paths</TabsTrigger>
            <TabsTrigger value="tutor">🤖 AI Tutor</TabsTrigger>
            <TabsTrigger value="playground">💻 Code Playground</TabsTrigger>
          </TabsList>

          <TabsContent value="learning">
            {/* Learning Paths Content */}
            <div className="grid grid-cols-1 gap-6">
              {Object.entries(learningPaths).map(([id, path]) => (
                <Card key={id}>
                  <CardHeader>
                    <CardTitle>{path.name}</CardTitle>
                  </CardHeader>
                  <CardContent>
                    {/* Add learning path content */}
                  </CardContent>
                </Card>
              ))}
            </div>
          </TabsContent>

          <TabsContent value="tutor">
            {/* AI Tutor Content */}
            <div className="flex flex-col h-[600px]">
              <TutorAvatar state={tutorState} />
              
              <div className="flex-1 overflow-y-auto mb-4 space-y-4">
                {messages.map((msg, idx) => (
                  <ChatMessage key={idx} {...msg} />
                ))}
              </div>

              <div className="flex gap-2">
                <input
                  type="text"
                  value={userInput}
                  onChange={(e) => setUserInput(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>
            </div>
          </TabsContent>

          <TabsContent value="playground">
            {/* Code Playground Content */}
            <Card>
              <CardContent>
                <textarea
                  className="w-full h-64 font-mono p-4 border rounded"
                  placeholder="Write your Python code here..."
                />
                <button className="mt-4 bg-blue-500 text-white px-4 py-2 rounded hover:bg-blue-600">
                  Run Code
                </button>
              </CardContent>
            </Card>
          </TabsContent>
        </Tabs>
      </main>
    </div>
  );
};

export default App;