'use client';

import React, { useEffect, useRef, useState } from 'react';

export default function WhyLoyalySection() {
  const [active, setActive] = useState(false);
  const [count, setCount] = useState(0);
  const panelRef = useRef<HTMLDivElement>(null);
  const rafRef = useRef<number>(0);

  useEffect(() => {
    const el = panelRef.current;
    if (!el) return;
    const obs = new MutationObserver(() => {
      const isActive = el.hasAttribute('data-active');
      setActive(isActive);
      if (isActive) {
        const start = performance.now();
        const dur = 2000;
        const tick = (now: number) => {
          const t = Math.min((now - start) / dur, 1);
          setCount(Math.round((1 - Math.pow(1 - t, 4)) * 21000000));
          if (t < 1) rafRef.current = requestAnimationFrame(tick);
        };
        rafRef.current = requestAnimationFrame(tick);
      }
    });
    obs.observe(el, { attributes: true, attributeFilter: ['data-active'] });
    return () => { obs.disconnect(); cancelAnimationFrame(rafRef.current); };
  }, []);

  const bars = [
    { label: 'Online retail loyalty', pct: 78, color: '#171512' },
    { label: 'Offline retail loyalty', pct: 2,  color: '#ef4444' },
    { label: 'Loyaly target',          pct: 60, color: '#f4be28' },
  ];

  return (
    <section ref={panelRef} className="fp-panel fp-light" style={{ background: '#ffffff' }}>

      {/* Faint grid */}
      <div className="fp-deco" style={{
        position: 'absolute', inset: 0, zIndex: 0,
        backgroundImage: 'linear-gradient(rgba(23,21,18,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(23,21,18,0.03) 1px, transparent 1px)',
        backgroundSize: '72px 72px',
      }} />

      <div className="fp-shell">
        <div style={{ marginBottom: 'clamp(40px, 6vh, 64px)' }}>
          <span className="fp-kicker fp-rise">The Gap · 01</span>
        </div>

        <div className="fp-split" style={{ gridTemplateColumns: '1fr 1fr' }}>

          {/* Giant stat */}
          <div>
            {/* "0%" as two-color giant */}
            <div style={{
              display: 'flex', alignItems: 'flex-start', gap: 0,
              opacity: active ? 1 : 0, transform: active ? 'translateY(0)' : 'translateY(50px)',
              transition: 'opacity 0.95s cubic-bezier(0.16,1,0.3,1), transform 0.95s cubic-bezier(0.16,1,0.3,1)',
            }}>
              <span style={{ fontSize: 'clamp(120px, 18vw, 260px)', fontWeight: 900, fontFamily: 'Sora, sans-serif', color: '#f4be28', letterSpacing: '-0.06em', lineHeight: 0.85 }}>0</span>
              <span style={{ fontSize: 'clamp(60px, 9vw, 130px)', fontWeight: 900, fontFamily: 'Sora, sans-serif', color: '#171512', letterSpacing: '-0.04em', lineHeight: 0.85, paddingTop: '0.12em' }}>%</span>
            </div>

            <div className="fp-rise" style={{ marginTop: 20, marginBottom: 32 }}>
              <div style={{
                display: 'inline-block', padding: '8px 16px', borderRadius: 10,
                background: '#ef4444', color: '#fff',
                fontSize: 12, fontWeight: 700, fontFamily: 'Manrope, sans-serif', letterSpacing: '0.08em', textTransform: 'uppercase',
              }}>Loyalty penetration in offline retail</div>
            </div>

            {/* Three metric chips */}
            <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
              {[
                { val: '₹2.1L Cr', label: 'Offline retail market size', accent: '#171512' },
                { val: '<2%',       label: 'Currently getting rewards',  accent: '#ef4444' },
                { val: '10Cr+',     label: 'Shoppers Loyaly can reach',  accent: '#16a34a' },
              ].map((m, i) => (
                <div key={i} className="fp-rise" style={{
                  display: 'flex', alignItems: 'center', gap: 16, padding: '14px 18px',
                  borderRadius: 14, background: '#f5f5f5', border: `1.5px solid ${m.accent}22`,
                  transitionDelay: `${0.1 + i * 0.08}s`,
                }}>
                  <div style={{ fontSize: 20, fontWeight: 900, fontFamily: 'Sora, sans-serif', color: m.accent, letterSpacing: '-0.03em', flexShrink: 0, minWidth: 72 }}>{m.val}</div>
                  <div style={{ fontSize: 12, color: 'rgba(23,21,18,0.6)', fontFamily: 'Manrope, sans-serif', lineHeight: 1.4 }}>{m.label}</div>
                </div>
              ))}
            </div>
          </div>

          {/* Content */}
          <div>
            {/* Live counter badge */}
            <div className="fp-rise" style={{
              display: 'inline-flex', alignItems: 'center', gap: 10, marginBottom: 28,
              background: '#fff7e0', border: '1.5px solid #f4be28', borderRadius: 100, padding: '10px 20px',
            }}>
              <span style={{ width: 8, height: 8, borderRadius: '50%', background: '#16a34a', display: 'block', flexShrink: 0, boxShadow: '0 0 0 3px rgba(22,163,74,0.2)', animation: 'fpPulse 1.5s ease-in-out infinite' }} />
              <span style={{ fontSize: 13, fontWeight: 700, color: '#171512', fontFamily: 'Manrope, sans-serif' }}>
                <span style={{ color: '#f4be28' }}>{count.toLocaleString()}</span> txns today · unrewarded
              </span>
            </div>

            <h2 style={{
              fontSize: 'clamp(30px, 3.6vw, 50px)', fontWeight: 900, lineHeight: 1.08,
              letterSpacing: '-0.04em', color: '#171512', margin: '0 0 20px', fontFamily: 'Sora, sans-serif',
            }}>
              <span className="fp-mask"><span>Millions shop offline.</span></span>
              <span className="fp-mask"><span style={{ color: '#ef4444' }}>Nobody rewards them.</span></span>
            </h2>

            <p className="fp-rise" style={{
              fontSize: 16, lineHeight: 1.8, color: '#4f463a', margin: '0 0 36px',
              fontFamily: 'Manrope, sans-serif', maxWidth: 440,
            }}>
              India&apos;s offline retail market is worth ₹2.1 lakh crore. Yet loyalty penetration sits at effectively zero. Loyaly exists to close that gap — permanently.
            </p>

            {/* Data bars */}
            {bars.map((b, i) => (
              <div key={i} style={{ marginBottom: 16 }}>
                <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 7 }}>
                  <span style={{ fontSize: 13, fontWeight: 600, color: '#171512', fontFamily: 'Manrope, sans-serif' }}>{b.label}</span>
                  <span style={{ fontSize: 14, fontWeight: 800, color: b.color, fontFamily: 'Sora, sans-serif' }}>{b.pct}%</span>
                </div>
                <div style={{ height: 8, background: 'rgba(23,21,18,0.07)', borderRadius: 100, overflow: 'hidden' }}>
                  <div style={{
                    height: '100%', borderRadius: 100, background: b.color,
                    width: active ? `${b.pct}%` : '0%',
                    transition: `width ${0.9 + i * 0.2}s cubic-bezier(0.22,1,0.36,1) ${0.4 + i * 0.15}s`,
                  }} />
                </div>
              </div>
            ))}
          </div>
        </div>
      </div>
    </section>
  );
}