'use client';

import { useAuth } from '@/contexts/AuthContext';
import { useRouter } from 'next/navigation';
import { useEffect, useState, useRef, FormEvent } from 'react';

interface Message {
  id: string;
  role: 'user' | 'assistant';
  content: string;
  timestamp: Date;
}

export default function ChatPage() {
  const { user, isLoading } = useAuth();
  const router = useRouter();
  const [messages, setMessages] = useState<Message[]>([]);
  const [input, setInput] = useState('');
  const [sending, setSending] = useState(false);
  const messagesEndRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!isLoading && !user) {
      router.push('/auth');
    }
  }, [user, isLoading, router]);

  useEffect(() => {
    // Scroll to bottom when messages change
    messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
  }, [messages]);

  if (isLoading) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-[#050316] text-white">
        <div className="animate-pulse text-2xl">Loading...</div>
      </div>
    );
  }

  if (!user) return null;

  const handleSendMessage = async (e: FormEvent) => {
    e.preventDefault();
    if (!input.trim() || sending) return;

    const userMessage: Message = {
      id: Date.now().toString(),
      role: 'user',
      content: input.trim(),
      timestamp: new Date(),
    };

    setMessages((prev) => [...prev, userMessage]);
    setInput('');
    setSending(true);

    // Simulate AI response (replace with real AI later)
    setTimeout(() => {
      const aiMessage: Message = {
        id: (Date.now() + 1).toString(),
        role: 'assistant',
        content: `Hola! I received your message: "${userMessage.content}". I'm your AI companion, ready to help! (AI integration coming soon)`,
        timestamp: new Date(),
      };
      setMessages((prev) => [...prev, aiMessage]);
      setSending(false);
    }, 1000);
  };

  return (
    <div className="h-screen flex flex-col bg-[#050316] text-white">
      {/* Navigation */}
      <nav className="border-b border-white/10 bg-white/5 backdrop-blur-sm flex-shrink-0">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div className="flex justify-between items-center h-16">
            <div className="flex items-center space-x-8">
              <h1 className="text-2xl font-bold">HolaCompi Chat</h1>
              <button
                onClick={() => router.push('/dashboard')}
                className="text-gray-400 hover:text-white transition-colors"
              >
                ← Back to Dashboard
              </button>
            </div>
            <div className="text-sm text-gray-400">
              Chatting as {user.name || user.email}
            </div>
          </div>
        </div>
      </nav>

      {/* Chat Messages */}
      <div className="flex-1 overflow-y-auto px-4 py-6">
        <div className="max-w-4xl mx-auto space-y-6">
          {messages.length === 0 ? (
            <div className="text-center py-12">
              <div className="text-6xl mb-4">👋</div>
              <h2 className="text-2xl font-bold mb-2">Welcome to HolaCompi!</h2>
              <p className="text-gray-400">
                Start a conversation with your AI companion
              </p>
            </div>
          ) : (
            messages.map((message) => (
              <div
                key={message.id}
                className={`flex ${message.role === 'user' ? 'justify-end' : 'justify-start'}`}
              >
                <div
                  className={`max-w-[70%] rounded-2xl px-6 py-4 ${
                    message.role === 'user'
                      ? 'bg-purple-500 text-white'
                      : 'bg-white/10 text-white border border-white/10'
                  }`}
                >
                  <div className="flex items-start space-x-3">
                    <div className="flex-shrink-0 text-2xl">
                      {message.role === 'user' ? '👤' : '🤖'}
                    </div>
                    <div className="flex-1">
                      <p className="text-sm mb-1 opacity-70">
                        {message.role === 'user' ? 'You' : 'HolaCompi'}
                      </p>
                      <p className="whitespace-pre-wrap">{message.content}</p>
                      <p className="text-xs opacity-50 mt-2">
                        {message.timestamp.toLocaleTimeString()}
                      </p>
                    </div>
                  </div>
                </div>
              </div>
            ))
          )}
          {sending && (
            <div className="flex justify-start">
              <div className="max-w-[70%] rounded-2xl px-6 py-4 bg-white/10 border border-white/10">
                <div className="flex items-center space-x-2">
                  <div className="text-2xl">🤖</div>
                  <div className="flex space-x-1">
                    <div className="w-2 h-2 bg-purple-400 rounded-full animate-bounce"></div>
                    <div className="w-2 h-2 bg-purple-400 rounded-full animate-bounce" style={{ animationDelay: '0.1s' }}></div>
                    <div className="w-2 h-2 bg-purple-400 rounded-full animate-bounce" style={{ animationDelay: '0.2s' }}></div>
                  </div>
                </div>
              </div>
            </div>
          )}
          <div ref={messagesEndRef} />
        </div>
      </div>

      {/* Input Area */}
      <div className="border-t border-white/10 bg-white/5 backdrop-blur-sm flex-shrink-0">
        <div className="max-w-4xl mx-auto p-4">
          <form onSubmit={handleSendMessage} className="flex space-x-4">
            <input
              type="text"
              value={input}
              onChange={(e) => setInput(e.target.value)}
              placeholder="Type your message..."
              className="flex-1 rounded-xl px-6 py-4 bg-black/30 border border-white/10 text-white placeholder-gray-500 outline-none focus:border-purple-400 transition-colors"
              disabled={sending}
            />
            <button
              type="submit"
              disabled={!input.trim() || sending}
              className="px-8 py-4 rounded-xl bg-purple-500 hover:bg-purple-600 disabled:opacity-50 disabled:cursor-not-allowed transition-colors font-medium"
            >
              Send
            </button>
          </form>
        </div>
      </div>
    </div>
  );
}