frontend/src/pages/KitchenView.jsx

import React, { useState, useEffect, useRef } from 'react';
import { db } from '../firebase/config';
import { ref, onValue, update } from 'firebase/database';
import { useAuth } from '../context/AuthContext';
import { useNavigate } from 'react-router-dom';
import { CheckCircle, Clock, UtensilsCrossed, LogOut, ExternalLink, PlayCircle, Flame } from 'lucide-react';

export default function KitchenView() {
  const { logout } = useAuth();
  const navigate = useNavigate();
  const [orders, setOrders] = useState([]);
  const lastOrderCount = useRef(0);

  useEffect(() => {
    const ordersRef = ref(db, 'orders');
    onValue(ordersRef, (snapshot) => {
      const data = snapshot.val();
      if (data) {
        const orderList = Object.keys(data).map(k => ({ id: k, ...data[k] }))
          .filter(o => o.status !== 'completed')
          .sort((a, b) => b.timestamp - a.timestamp);
        
        // Alerta de sonido si hay nuevas órdenes
        if (orderList.length > lastOrderCount.current) {
            playNotificationSound();
        }
        lastOrderCount.current = orderList.length;
        setOrders(orderList);
      } else {
        setOrders([]);
      }
    });
  }, []);

  const playNotificationSound = () => {
    const audio = new Audio('https://assets.mixkit.co/active_storage/sfx/2869/2869-preview.mp3');
    audio.play().catch(e => console.log("User interaction required for audio"));
  };

  const updateStatus = async (id, status) => {
    await update(ref(db, `orders/${id}`), { status });
  };

  const handleLogout = async () => {
    await logout();
    navigate('/login');
  };

  return (
    <div className="app-container" style={{ flexDirection: 'column', background: 'var(--bg-base)', height: '100vh', overflow: 'hidden' }}>
      <header className="glass-panel" style={{ padding: '1rem 2.5rem', display: 'flex', justifyContent: 'space-between', alignItems: 'center', borderRadius: '0', borderBottom: '1px solid var(--border-subtle)' }}>
        <h1 className="text-gradient" style={{ fontSize: '1.5rem', fontWeight: '800', display: 'flex', alignItems: 'center', gap: '0.75rem' }}>
          <UtensilsCrossed size={24} /> KDS - Centro de Cocina
        </h1>
        <div style={{ display: 'flex', alignItems: 'center', gap: '1.5rem' }}>
          <div style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', color: 'var(--success)', fontSize: '0.9rem' }}>
            <div style={{ width: '8px', height: '8px', background: 'var(--success)', borderRadius: '50%', boxShadow: '0 0 10px var(--success)' }}></div>
            En Vivo
          </div>
          <button className="btn-glass" onClick={handleLogout} style={{ padding: '0.5rem 1rem', color: 'var(--primary)' }}>
            <LogOut size={16} /> Salir
          </button>
        </div>
      </header>

      <div className="main-content" style={{ padding: '2rem', display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(320px, 1fr))', gap: '1.5rem', overflowY: 'auto' }}>
        {orders.length === 0 ? (
          <div style={{ gridColumn: '1 / -1', textAlign: 'center', paddingTop: '10vh', color: 'var(--text-muted)' }}>
             <UtensilsCrossed size={60} style={{ opacity: 0.1, marginBottom: '1rem' }} />
             <h2 style={{ fontSize: '1.5rem' }}>Cocina Despejada</h2>
             <p>No hay pedidos en espera.</p>
          </div>
        ) : (
          orders.map((order) => (
            <div key={order.id} className="glass-card animate-fade-in" style={{ 
                padding: '1.5rem', 
                borderLeft: order.status === 'preparing' ? '4px solid var(--warning)' : '4px solid var(--primary)',
                background: order.status === 'preparing' ? 'rgba(255,200,0,0.02)' : 'var(--bg-card)'
            }}>
              <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: '1.25rem', alignItems: 'center' }}>
                <span style={{ fontSize: '1.2rem', fontWeight: '800', color: order.status === 'preparing' ? 'var(--warning)' : 'var(--primary)' }}>
                    {order.table} {order.type === 'Llevar' && '🛍️'} {order.type === 'Delivery' && '🚀'}
                </span>
                <span style={{ fontSize: '0.8rem', color: 'var(--text-muted)' }}>
                  {Math.floor((Date.now() - order.timestamp) / 60000)} min atrás
                </span>
              </div>
              
              <div style={{ marginBottom: '1.5rem', minHeight: '80px' }}>
                {order.items.map((item, idx) => (
                  <div key={idx} style={{ display: 'flex', justifyContent: 'space-between', padding: '0.5rem 0', borderBottom: '1px solid rgba(255,255,255,0.05)' }}>
                    <span style={{ fontWeight: '600' }}><span style={{ color: 'var(--primary)', fontWeight: '800' }}>{item.qty}</span> {item.name}</span>
                  </div>
                ))}
              </div>

              <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '0.75rem' }}>
                {order.status !== 'preparing' ? (
                    <button 
                        className="btn-glass" 
                        onClick={() => updateStatus(order.id, 'preparing')}
                        style={{ background: 'rgba(255,160,0,0.1)', color: '#FFB000' }}
                    >
                        <Flame size={18} /> Preparar
                    </button>
                ) : (
                    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: '0.8rem', color: 'var(--warning)', fontWeight: '700' }}>
                        ENCENDIDO...
                    </div>
                )}
                <button 
                    className="btn-primary" 
                    onClick={() => updateStatus(order.id, 'completed')}
                    style={{ background: 'var(--success)', color: '#fff' }}
                >
                    <CheckCircle size={18} /> Listo
                </button>
              </div>
            </div>
          ))
        )}
      </div>
    </div>
  );
}