import React, { useState, useEffect } from 'react';
import { User, MessageSquare, Palette, Smartphone, X, ChevronRight, ExternalLink } from 'lucide-react';

// --- COMPONENTE PRINCIPAL ---
export default function App() {
  const [userData, setUserData] = useState(null);
  const [platformData, setPlatformData] = useState(null);
  const [themeData, setThemeData] = useState(null);
  const [chatData, setChatData] = useState(null);
  
  // Estado para el Modal
  const [selectedCategory, setSelectedCategory] = useState(null);

  useEffect(() => {
    const tg = window.Telegram?.WebApp;

    if (tg && tg.initDataUnsafe && Object.keys(tg.initDataUnsafe).length > 0) {
      // --- ENTORNO REAL DE TELEGRAM ---
      tg.ready();
      tg.expand();
      
      // Configurar colores de la barra de estado de Telegram
      if (tg.setHeaderColor) tg.setHeaderColor('#3d0091');
      if (tg.setBackgroundColor) tg.setBackgroundColor('#121212');

      setUserData(tg.initDataUnsafe.user);
      setChatData({
        start_param: tg.initDataUnsafe.start_param || 'N/A',
        chat_type: tg.initDataUnsafe.chat_type || 'private',
        chat_instance: tg.initDataUnsafe.chat_instance || 'N/A',
      });
      setThemeData(tg.themeParams);
      setPlatformData({
        platform: tg.platform,
        version: tg.version,
        viewportHeight: tg.viewportHeight,
        colorScheme: tg.colorScheme
      });

    } else {
      // --- MODO DESARROLLO (MOCK DATA) ---
      console.log("Modo desarrollo: Cargando datos Mock");
      setUserData({
        id: 987654321,
        first_name: "Dev",
        last_name: "Tester",
        username: "dev_tester",
        language_code: "en",
        is_premium: false,
        photo_url: null 
      });
      setChatData({
        start_param: "debug_mode_on",
        chat_type: "supergroup",
        chat_instance: "1122334455"
      });
      setChatData({
        start_param: "referral_source_ads",
        chat_type: "private",
        chat_instance: "84758473829102"
      });
      setThemeData({
        bg_color: "#121212",
        text_color: "#ffffff",
        hint_color: "#999999",
        link_color: "#7c4dff",
        button_color: "#3d0091",
        button_text_color: "#ffffff"
      });
      setPlatformData({
        platform: "ios",
        version: "7.0",
        viewportHeight: 640,
        colorScheme: "dark"
      });
    }
  }, []);

  // Función para cerrar el modal
  const closeModal = () => setSelectedCategory(null);

  // Renderizado de lista de detalles
  const renderDetails = (data) => {
    if (!data) return <p className="text-gray-400">Sin datos disponibles.</p>;
    return Object.entries(data).map(([key, value]) => (
      <div key={key} className="flex flex-col py-3 border-b border-white/10 last:border-0">
        <span className="text-xs font-semibold text-purple-300 uppercase tracking-wider mb-1">
          {key.replace(/_/g, ' ')}
        </span>
        <span className="text-white text-sm break-all font-mono bg-black/20 p-2 rounded">
          {value !== null && value !== undefined ? value.toString() : 'N/A'}
        </span>
      </div>
    ));
  };

  return (
    <div className="min-h-screen bg-[#121212] text-white font-sans selection:bg-purple-500/30">
      
      {/* --- HEADER CURVO --- */}
      <div className="relative bg-[#3d0091] pt-8 pb-12 rounded-b-[40px] shadow-2xl shadow-purple-900/20">
        <div className="flex flex-col items-center justify-center px-4">
          {/* Avatar con anillo animado */}
          <div className="relative group cursor-pointer">
            <div className="absolute -inset-1 bg-gradient-to-r from-pink-500 to-purple-600 rounded-full opacity-75 group-hover:opacity-100 blur transition duration-200"></div>
            <div className="relative w-24 h-24 rounded-full bg-[#1e1e1e] border-4 border-[#3d0091] flex items-center justify-center overflow-hidden">
               {userData?.photo_url ? (
                  <img src={userData.photo_url} alt="User" className="w-full h-full object-cover" />
               ) : (
                  <span className="text-3xl font-bold text-white">
                    {userData?.first_name ? userData.first_name[0] : 'U'}
                  </span>
               )}
            </div>
          </div>

          <h1 className="mt-4 text-2xl font-bold tracking-tight text-white">
            Hola, {userData?.first_name || 'Usuario'}
          </h1>
          
          {userData?.username && (
            <div className="mt-2 px-3 py-1 bg-white/10 backdrop-blur-md rounded-full border border-white/10 text-sm font-medium text-purple-200">
              @{userData.username}
            </div>
          )}
        </div>
      </div>

      {/* --- CONTENIDO PRINCIPAL --- */}
      <div className="px-6 -mt-6 pb-10 relative z-10">
        <div className="text-center mb-4 opacity-75 text-xs font-medium uppercase tracking-widest text-purple-200">
          Panel de Control
        </div>

        {/* GRID 2x2 - USO DE TAILWIND GRID QUE ES MUCHO MÁS ROBUSTO */}
        <div className="grid grid-cols-2 gap-4 w-full max-w-md mx-auto">
          
          {/* TARJETA 1: USUARIO */}
          <CardButton 
            icon={<User size={32} className="text-purple-400" />}
            label="USUARIO"
            color="bg-purple-500/10"
            borderColor="border-purple-500/20"
            onClick={() => setSelectedCategory({ title: 'Datos de Usuario', data: userData, icon: <User /> })}
          />

          {/* TARJETA 2: CHAT */}
          <CardButton 
            icon={<MessageSquare size={32} className="text-pink-400" />}
            label="CHAT"
            color="bg-pink-500/10"
            borderColor="border-pink-500/20"
            onClick={() => setSelectedCategory({ title: 'Contexto Chat', data: chatData, icon: <MessageSquare /> })}
          />

          {/* TARJETA 3: TEMA */}
          <CardButton 
            icon={<Palette size={32} className="text-emerald-400" />}
            label="TEMA"
            color="bg-emerald-500/10"
            borderColor="border-emerald-500/20"
            onClick={() => setSelectedCategory({ title: 'Apariencia', data: themeData, icon: <Palette /> })}
          />

          {/* TARJETA 4: SISTEMA */}
          <CardButton 
            icon={<Smartphone size={32} className="text-orange-400" />}
            label="SISTEMA"
            color="bg-orange-500/10"
            borderColor="border-orange-500/20"
            onClick={() => setSelectedCategory({ title: 'Dispositivo', data: platformData, icon: <Smartphone /> })}
          />

        </div>

        {/* Botón de documentación */}
        <div className="mt-8 text-center">
          <button 
            onClick={() => window.open('https://core.telegram.org/bots/webapps', '_blank')}
            className="inline-flex items-center gap-2 text-sm text-gray-500 hover:text-purple-400 transition-colors"
          >
            <span>Documentación API</span>
            <ExternalLink size={14} />
          </button>
        </div>
      </div>

      {/* --- MODAL PERSONALIZADO (Sin librerías pesadas) --- */}
      {selectedCategory && (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 animate-in fade-in duration-200">
          {/* Overlay oscuro */}
          <div 
            className="absolute inset-0 bg-black/80 backdrop-blur-sm" 
            onClick={closeModal}
          ></div>
          
          {/* Contenido del Modal */}
          <div className="relative w-full max-w-sm bg-[#1e1e1e] rounded-2xl shadow-2xl border border-white/10 overflow-hidden transform transition-all scale-100">
            
            {/* Cabecera del Modal */}
            <div className="flex items-center justify-between p-4 border-b border-white/10 bg-[#252525]">
              <div className="flex items-center gap-3 text-white">
                <div className="p-2 bg-white/5 rounded-lg text-purple-400">
                  {selectedCategory.icon}
                </div>
                <h3 className="font-bold text-lg">{selectedCategory.title}</h3>
              </div>
              <button 
                onClick={closeModal}
                className="p-2 text-gray-400 hover:text-white hover:bg-white/10 rounded-full transition-colors"
              >
                <X size={20} />
              </button>
            </div>

            {/* Cuerpo del Modal */}
            <div className="p-4 max-h-[60vh] overflow-y-auto">
              {renderDetails(selectedCategory.data)}
            </div>

            {/* Pie del Modal */}
            <div className="p-4 bg-[#252525] border-t border-white/10">
              <button 
                onClick={closeModal}
                className="w-full py-3 bg-[#3d0091] hover:bg-[#4d00b1] text-white font-bold rounded-xl transition-all active:scale-[0.98]"
              >
                Cerrar
              </button>
            </div>
          </div>
        </div>
      )}

    </div>
  );
}

// --- COMPONENTE DE TARJETA REUTILIZABLE ---
// Este componente garantiza la forma cuadrada con 'aspect-square'
function CardButton({ icon, label, color, borderColor, onClick }) {
  return (
    <button
      onClick={onClick}
      className={`
        relative group flex flex-col items-center justify-center 
        aspect-square w-full rounded-2xl 
        ${color} border ${borderColor}
        hover:brightness-125 active:scale-95 
        transition-all duration-200 ease-out
      `}
    >
      <div className="mb-3 transform group-hover:scale-110 transition-transform duration-200">
        {icon}
      </div>
      <span className="text-xs font-bold tracking-wider text-white/90">
        {label}
      </span>
      
      {/* Indicador sutil de flecha */}
      <div className="absolute top-3 right-3 opacity-0 group-hover:opacity-50 transition-opacity">
        <ChevronRight size={16} className="text-white" />
      </div>
    </button>
  );
}