import React, { useState, useEffect } from 'react';
import { TrendingUp, Lock, ArrowRight, CheckCircle, AlertTriangle, Clock, ShieldCheck, MessageCircle } from 'lucide-react';

// ==========================================
// 🔧 配置区域 (请在此处修改您的信息)
// ==========================================
const CONFIG = {
  // 1. Google Analytics 4 衡量 ID (格式: G-XXXXXXXXXX)
  GA_MEASUREMENT_ID: 'G-YOUR_GA_ID_HERE', 
  
  // 2. 自定义 GA4 事件名称 (用于 Google Ads 转化回传)
  GA_EVENT_NAME: 'generate_lead_whatsapp', 
  
  // 3. WhatsApp 接收号码 (包含国家代码，不带+号，例如 8613800000000)
  WHATSAPP_NUMBER: '34600000000', 
  
  // 4. WhatsApp 预设发送消息 (URL编码会自动处理)
  WHATSAPP_MESSAGE: 'Hola, quiero obtener mi lista exclusiva de acciones 2025.',
  
  // 5. 自动跳转延迟 (毫秒)
  AUTO_REDIRECT_DELAY: 2500 
};

export default function SpanishLanding() {
  const [step, setStep] = useState(1); // 1: Info, 2: Question, 3: Success
  const [timeLeft, setTimeLeft] = useState({ minutes: 4, seconds: 59 });

  // ------------------------------------------------
  // GA4 初始化代码 (组件加载时自动执行)
  // ------------------------------------------------
  useEffect(() => {
    // 检查是否已经存在 GA 脚本，避免重复添加
    if (!document.getElementById('ga-script')) {
      const script = document.createElement('script');
      script.id = 'ga-script';
      script.async = true;
      script.src = `https://www.googletagmanager.com/gtag/js?id=${CONFIG.GA_MEASUREMENT_ID}`;
      document.head.appendChild(script);

      window.dataLayer = window.dataLayer || [];
      function gtag(){window.dataLayer.push(arguments);}
      gtag('js', new Date());
      gtag('config', CONFIG.GA_MEASUREMENT_ID);
      
      // 这里的 gtag 是挂载在 window 上的，定义一个全局引用方便后续调用
      window.gtag = gtag; 
    }
  }, []);

  // ------------------------------------------------
  // WhatsApp 跳转核心功能 + GA4 事件回传
  // ------------------------------------------------
  const handleWhatsAppRedirect = () => {
    // 1. 触发 GA4 事件
    if (window.gtag) {
      console.log(`Sending GA4 Event: ${CONFIG.GA_EVENT_NAME}`);
      window.gtag('event', CONFIG.GA_EVENT_NAME, {
        'event_category': 'conversion',
        'event_label': 'whatsapp_click',
        'value': 1
      });
    } else {
      console.warn("GA4 not initialized yet, skipping event track.");
    }

    // 2. 构建 WhatsApp URL
    const message = encodeURIComponent(CONFIG.WHATSAPP_MESSAGE);
    const whatsappUrl = `https://wa.me/${CONFIG.WHATSAPP_NUMBER}?text=${message}`;

    // 3. 执行跳转
    window.location.href = whatsappUrl;
  };

  // ------------------------------------------------
  // 倒计时逻辑
  // ------------------------------------------------
  useEffect(() => {
    const timer = setInterval(() => {
      setTimeLeft((prev) => {
        if (prev.seconds > 0) {
          return { ...prev, seconds: prev.seconds - 1 };
        } else if (prev.minutes > 0) {
          return { minutes: prev.minutes - 1, seconds: 59 };
        } else {
          clearInterval(timer);
          return { minutes: 0, seconds: 0 };
        }
      });
    }, 1000);
    return () => clearInterval(timer);
  }, []);

  // ------------------------------------------------
  // 自动跳转逻辑 (仅在 Step 3 激活)
  // ------------------------------------------------
  useEffect(() => {
    if (step === 3) {
      const redirectTimer = setTimeout(() => {
        handleWhatsAppRedirect();
      }, CONFIG.AUTO_REDIRECT_DELAY);
      return () => clearTimeout(redirectTimer);
    }
  }, [step]);

  const handleNext = () => {
    setStep(step + 1);
  };

  return (
    <div className="min-h-screen bg-gray-50 font-sans text-gray-900">
      
      {/* 顶部紧迫条 */}
      <div className="bg-red-600 text-white text-center py-2 px-4 text-sm font-bold flex justify-center items-center gap-2 animate-pulse">
        <Clock size={16} />
        <span>OFERTA LIMITADA: La lista se cierra en {timeLeft.minutes}:{timeLeft.seconds < 10 ? `0${timeLeft.seconds}` : timeLeft.seconds}</span>
      </div>

      {/* 主内容区 */}
      <div className="max-w-md mx-auto bg-white min-h-screen md:min-h-0 md:my-10 md:rounded-2xl md:shadow-2xl overflow-hidden">
        
        {/* 头部 Logo 区域 */}
        <div className="bg-slate-900 p-6 text-center border-b border-slate-800">
          <div className="flex items-center justify-center gap-2 text-emerald-400 mb-2">
            <ShieldCheck size={32} />
            <span className="text-xl font-bold tracking-wider text-white">INVEST PRO ES</span>
          </div>
          <p className="text-slate-400 text-xs uppercase tracking-widest">Informe Confidencial 2025</p>
        </div>

        {/* 核心内容 */}
        <div className="p-6 md:p-8">
          
          {step === 1 && (
            <div className="space-y-6 fade-in">
              <div className="bg-emerald-50 border border-emerald-200 rounded-xl p-4 flex items-start gap-3">
                <CheckCircle className="text-emerald-600 shrink-0 mt-1" size={24} />
                <div>
                  <h2 className="font-bold text-emerald-800 text-lg">¡Felicitaciones!</h2>
                  <p className="text-emerald-700 text-sm leading-relaxed">
                    Has sido seleccionado para acceder a la lista exclusiva de acciones de alto rendimiento.
                  </p>
                </div>
              </div>

              <div className="text-center space-y-2">
                <h1 className="text-2xl font-black text-slate-900 leading-tight">
                  Esta acción está a punto de <span className="text-red-600 underline decoration-4 decoration-yellow-400">EXPLOTAR</span>
                </h1>
                <p className="text-gray-500 text-sm">Los analistas confirman la tendencia alcista inminente.</p>
              </div>

              {/* 数据展示卡片 - 核心诱饵 */}
              <div className="bg-white border-2 border-slate-100 rounded-xl shadow-lg overflow-hidden">
                <div className="grid grid-cols-2 divide-x divide-gray-100">
                  <div className="p-4 text-center bg-gray-50">
                    <p className="text-xs text-gray-500 uppercase font-bold">Precio Actual</p>
                    <p className="text-2xl font-black text-gray-700">€0.87</p>
                  </div>
                  <div className="p-4 text-center bg-emerald-50">
                    <p className="text-xs text-emerald-600 uppercase font-bold">En 7 Días</p>
                    <p className="text-2xl font-black text-emerald-600">€26.80</p>
                    <TrendingUp size={16} className="inline text-emerald-500 ml-1" />
                  </div>
                </div>
                <div className="p-4 bg-slate-900 text-center text-white">
                  <p className="text-xs text-slate-400 uppercase font-bold mb-1">Proyección 30 Días</p>
                  <p className="text-4xl font-black text-yellow-400">€69.20</p>
                </div>
              </div>

              {/* 长期画饼 */}
              <div className="bg-gradient-to-r from-yellow-50 to-orange-50 p-4 rounded-xl border border-yellow-100 text-center">
                <p className="text-sm font-medium text-yellow-800 mb-1">Potencial a Largo Plazo (2026)</p>
                <p className="text-lg font-bold text-gray-800">
                  Compra <span className="text-red-600">200 acciones</span> hoy
                </p>
                <ArrowRight className="mx-auto text-gray-400 my-1" size={20} />
                <p className="text-2xl font-black text-emerald-600">Obtén €2,000,000</p>
              </div>

              <button 
                onClick={handleNext}
                className="w-full bg-red-600 hover:bg-red-700 text-white font-bold py-4 px-6 rounded-lg text-lg shadow-lg shadow-red-200 transition transform hover:scale-105 active:scale-95 flex items-center justify-center gap-2"
              >
                VERIFICAR DISPONIBILIDAD
                <ArrowRight size={20} />
              </button>
            </div>
          )}

          {step === 2 && (
            <div className="space-y-8 py-4 fade-in">
              <div className="text-center">
                <div className="w-16 h-16 bg-blue-100 rounded-full flex items-center justify-center mx-auto mb-4 text-blue-600">
                  <Lock size={32} />
                </div>
                <h2 className="text-xl font-bold text-gray-900">Paso Final de Seguridad</h2>
                <p className="text-gray-500 mt-2">Responde una pregunta para desbloquear el reporte.</p>
              </div>

              <div className="space-y-4">
                <h3 className="text-lg font-semibold text-center">¿Tienes una cuenta de inversión activa o experiencia previa?</h3>
                
                <button 
                  onClick={handleNext}
                  className="w-full bg-white border-2 border-slate-200 hover:border-emerald-500 hover:bg-emerald-50 p-4 rounded-xl text-left flex items-center justify-between group transition"
                >
                  <span className="font-bold text-gray-700 group-hover:text-emerald-700">Sí, tengo experiencia</span>
                  <div className="w-6 h-6 rounded-full border-2 border-gray-300 group-hover:border-emerald-500"></div>
                </button>

                <button 
                  onClick={handleNext}
                  className="w-full bg-white border-2 border-slate-200 hover:border-emerald-500 hover:bg-emerald-50 p-4 rounded-xl text-left flex items-center justify-between group transition"
                >
                  <span className="font-bold text-gray-700 group-hover:text-emerald-700">No, soy principiante</span>
                  <div className="w-6 h-6 rounded-full border-2 border-gray-300 group-hover:border-emerald-500"></div>
                </button>
              </div>
            </div>
          )}

          {step === 3 && (
            <div className="text-center py-10 space-y-6 fade-in">
              <div className="w-20 h-20 bg-emerald-100 rounded-full flex items-center justify-center mx-auto text-emerald-600 animate-bounce">
                <MessageCircle size={48} />
              </div>
              <h2 className="text-2xl font-black text-slate-900">¡Acceso Concedido!</h2>
              <p className="text-gray-600">Conectando con asesor en WhatsApp...</p>
              
              <div className="w-full bg-gray-200 rounded-full h-2.5 mb-4 dark:bg-gray-700 max-w-xs mx-auto overflow-hidden">
                <div className="bg-emerald-600 h-2.5 rounded-full animate-[loading_2s_ease-in-out_infinite]" style={{width: '80%'}}></div>
              </div>

              {/* 修改说明：
                 1. 样式: 改为大按钮，使用 WhatsApp 绿色 (#25D366)。
                 2. 动画: 添加了 animate-[float_3s_ease-in-out_infinite] 实现上下浮动。
                 3. 文案: "DESBLOQUEAR ACCIÓN AHORA" 对应 "立即解锁此股票"。
              */}
              <button 
                onClick={handleWhatsAppRedirect}
                className="w-full max-w-sm mx-auto bg-[#25D366] hover:bg-[#128C7E] text-white font-bold py-4 px-6 rounded-full text-lg shadow-xl shadow-green-200 transition flex items-center justify-center gap-3 animate-[float_3s_ease-in-out_infinite] cursor-pointer"
              >
                <MessageCircle size={24} className="animate-pulse" />
                DESBLOQUEAR ACCIÓN AHORA
              </button>
              
              <p className="text-xs text-gray-400 mt-4">
                Si no redirige automáticamente, haz clic en el botón.
              </p>
            </div>
          )}

        </div>

        {/* 底部免责声明 */}
        <div className="bg-gray-100 p-4 text-[10px] text-gray-400 text-center leading-tight">
          <p>
            DESCARGO DE RESPONSABILIDAD: El comercio de acciones implica riesgos. Los rendimientos pasados no garantizan resultados futuros. Esta proyección se basa en análisis de mercado simulados.
          </p>
          <p className="mt-2">© 2025 Invest Pro ES. Todos los derechos reservados.</p>
        </div>
      </div>

      <style jsx>{`
        @keyframes loading {
          0% { width: 0% }
          50% { width: 70% }
          100% { width: 100% }
        }
        
        /* 自定义上下浮动动画 */
        @keyframes float {
          0%, 100% { transform: translateY(0); }
          50% { transform: translateY(-10px); }
        }

        .fade-in {
          animation: fadeIn 0.5s ease-in;
        }
        @keyframes fadeIn {
          from { opacity: 0; transform: translateY(10px); }
          to { opacity: 1; transform: translateY(0); }
        }
      `}</style>
    </div>
  );
}