import React, { useState, useEffect } from 'react';
import { Clipboard } from 'lucide-react';

const App: React.FC = () => {
  const [showToast, setShowToast] = useState(false);
  const [confetti, setConfetti] = useState<{ id: number; x: number; delay: number; size: number; color: string }[]>([]);
  const promoCode = 'Q7KM-9XTR-4VPL-82CW';

  // Generate confetti pieces
  useEffect(() => {
    const colors = ['#FF6B6B', '#FECA57', '#48DBFB', '#FF9FF3', '#54A0FF', '#5F27CD'];
    const pieces = Array.from({ length: 80 }, (_, i) => ({
      id: i,
      x: Math.random() * 100,
      delay: Math.random() * 3,
      size: 6 + Math.random() * 8,
      color: colors[Math.floor(Math.random() * colors.length)],
    }));
    setConfetti(pieces);
  }, []);

  // Copy to clipboard
  const handleCopy = async () => {
    try {
      await navigator.clipboard.writeText(promoCode);
      setShowToast(true);
      setTimeout(() => setShowToast(false), 2500);
    } catch (err) {
      console.error('Failed to copy: ', err);
    }
  };

  return (
    <div className="relative min-h-screen w-full overflow-hidden font-['SF_Pro_Display',-apple-system,BlinkMacSystemFont,'Segoe_UI',Roboto,sans-serif]">
      {/* Gradient Background */}
      <div className="absolute inset-0 bg-gradient-to-br from-[#0EA5E9] via-[#1A9CD1] to-[#22C1C3] will-change-transform" />

      {/* Confetti Animation - falling from top */}
      <div className="absolute inset-0 pointer-events-none overflow-hidden">
        {confetti.map((piece) => (
          <div
            key={piece.id}
            className="absolute top-0 rounded-sm animate-confetti-fall"
            style={{
              left: `${piece.x}%`,
              width: `${piece.size}px`,
              height: `${piece.size * 0.6}px`,
              backgroundColor: piece.color,
              animationDelay: `${piece.delay}s`,
              transform: `rotate(${Math.random() * 360}deg)`,
              opacity: 0.8,
            }}
          />
        ))}
      </div>

      {/* Floating confetti particles (subtle) */}
      <div className="absolute inset-0 pointer-events-none overflow-hidden">
        {Array.from({ length: 12 }).map((_, i) => (
          <div
            key={`float-${i}`}
            className="absolute rounded-full animate-float"
            style={{
              left: `${5 + Math.random() * 90}%`,
              top: `${5 + Math.random() * 90}%`,
              width: `${4 + Math.random() * 6}px`,
              height: `${4 + Math.random() * 6}px`,
              backgroundColor: ['#FFEAA7', '#DFE6E9', '#FFF', '#FDCB6E'][Math.floor(Math.random() * 4)],
              animationDelay: `${Math.random() * 5}s`,
              animationDuration: `${6 + Math.random() * 8}s`,
              opacity: 0.25,
            }}
          />
        ))}
      </div>

      {/* Main Card */}
      <div className="relative z-10 flex items-center justify-center min-h-screen w-full px-4 py-6">
        <div className="w-full max-w-sm bg-white/95 backdrop-blur-sm rounded-3xl shadow-2xl shadow-blue-900/30 p-6 animate-fade-in-scale border border-white/20">
          {/* Costco Logo (red) */}
          <div className="flex justify-center mb-2">
            <div className="text-3xl font-bold tracking-tight text-red-600 flex items-center gap-1">
              <span className="text-4xl">🛒</span>
              <span>COSTCO</span>
              <span className="text-sm font-light text-gray-500 ml-0.5">WHOLESALE</span>
            </div>
          </div>

          {/* Heading */}
          <h1 className="text-3xl font-bold text-center text-gray-800 mt-2 tracking-tight">
            Congratulations!
          </h1>

          {/* Subheading */}
          <p className="text-center text-sm text-gray-500 font-medium mt-1 tracking-wide uppercase">
            Your Exclusive Promo Code
          </p>

          {/* Promo Code Box */}
          <div className="mt-4 border-2 border-blue-400 rounded-xl p-3 bg-blue-50/50 shadow-inner">
            <div className="text-center font-mono text-xl font-bold tracking-widest text-gray-800 select-all">
              {promoCode}
            </div>
          </div>

          {/* Copy Button */}
          <button
            onClick={handleCopy}
            className="mt-5 w-full bg-green-500 hover:bg-green-600 active:scale-95 transition-all duration-200 text-white font-semibold py-4 px-6 rounded-2xl flex items-center justify-center gap-2 shadow-lg shadow-green-500/30"
          >
            <Clipboard size={20} strokeWidth={2.5} />
            <span>Copy Code</span>
          </button>

          {/* Helper text */}
          <p className="text-center text-xs text-gray-400 mt-3 tracking-wide">
            Apply this code during checkout
          </p>

          {/* Footer terms */}
          <p className="text-center text-[10px] text-gray-400 mt-5 tracking-tight">
            Offer availability, eligibility, and terms may apply.
          </p>
        </div>
      </div>

      {/* Toast Notification */}
      {showToast && (
        <div className="fixed bottom-10 left-1/2 -translate-x-1/2 z-50 bg-gray-800/90 backdrop-blur-sm text-white px-6 py-3 rounded-full shadow-xl text-sm font-medium animate-slide-up border border-white/10">
          <span className="flex items-center gap-2">
            <span className="text-green-400 text-lg">✓</span> Promo code copied!
          </span>
        </div>
      )}

      {/* Tailwind animations via style tag */}
      <style>{`
        @keyframes confetti-fall {
          0% { transform: translateY(-10vh) rotate(0deg) scale(0.8); opacity: 0.9; }
          100% { transform: translateY(110vh) rotate(720deg) scale(1.2); opacity: 0; }
        }
        @keyframes float {
          0% { transform: translate(0, 0) scale(1); }
          25% { transform: translate(15px, -20px) scale(1.1); }
          50% { transform: translate(-10px, -35px) scale(0.9); }
          75% { transform: translate(20px, -15px) scale(1.05); }
          100% { transform: translate(0, 0) scale(1); }
        }
        @keyframes fade-in-scale {
          0% { opacity: 0; transform: scale(0.92) translateY(20px); }
          100% { opacity: 1; transform: scale(1) translateY(0); }
        }
        @keyframes slide-up {
          0% { opacity: 0; transform: translate(-50%, 20px) scale(0.9); }
          100% { opacity: 1; transform: translate(-50%, 0) scale(1); }
        }
        .animate-confetti-fall {
          animation: confetti-fall 4.5s linear infinite;
        }
        .animate-float {
          animation: float 8s ease-in-out infinite;
        }
        .animate-fade-in-scale {
          animation: fade-in-scale 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
        }
        .animate-slide-up {
          animation: slide-up 0.3s ease-out forwards;
        }
        /* Prevent scrolling on iPhone */
        html, body {
          height: 100%;
          overflow: hidden;
          -webkit-overflow-scrolling: touch;
        }
        #root {
          height: 100%;
          overflow: hidden;
        }
      `}</style>
    </div>
  );
};

export default App;