import { useEffect, useRef } from 'react';
import { Battery, Zap, Database, Clock } from 'lucide-react';
import { Badge } from '@/components/ui/badge';
import { Card, CardHeader, CardTitle, CardContent } from '@/components/ui/card';

const calculations = [
  {
    icon: Battery,
    title: 'Energia Útil (Wh)',
    formula: 'Capacidade (Ah) × Tensão (V)',
    steps: [
      'Capacidade: 500 mAh = 0,500 Ah',
      'Tensão Nominal: 3,7 V',
      '0,500 Ah × 3,7 V = 1,85 Wh'
    ],
    result: '1,85 Wh de energia armazenada',
    color: 'orange'
  },
  {
    icon: Zap,
    title: 'Consumo por Modo',
    formula: 'Autonomia = mAh / mA',
    modes: [
      { name: 'Standby', current: '6,94 mA', autonomy: '72,0 h' },
      { name: 'Otimizado (Light)', current: '60 mA', autonomy: '8,33 h' },
      { name: 'Uso Normal', current: '125 mA', autonomy: '4,0 h' },
      { name: 'Performance', current: '260 mA', autonomy: '1,92 h' }
    ],
    color: 'teal'
  },
  {
    icon: Database,
    title: 'Armazenamento GPS',
    formula: 'Flash / Sample Size',
    steps: [
      'Flash: 4 MB (4.194.304 bytes)',
      'Sample: ~32 bytes (lat, lon, spd...)',
      'Capacidade Bruta: 131.072 amostras',
      'Realista (50% útil): ~18h @ 1Hz'
    ],
    result: 'Espaço para múltiplas sessões locais',
    color: 'blue'
  },
  {
    icon: Clock,
    title: 'Ciclo de Carga',
    formula: 'Capacidade / Corrente de Carga',
    steps: [
      'Carga Típica (0,5C): 250 mA',
      'Tempo Teórico: 2,0 h',
      'Com Overhead (CC-CV): ~2,2 h',
      'Carga Rápida (1C): ~1,2 h'
    ],
    result: '2h para carga completa segura',
    color: 'green'
  }
];

export function DeepDive() {
  const sectionRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const observer = new IntersectionObserver(
      (entries) => {
        entries.forEach((entry) => {
          if (entry.isIntersecting) {
            const elements = entry.target.querySelectorAll('.reveal-dive');
            elements.forEach((el, index) => {
              setTimeout(() => {
                el.classList.add('animate-fade-in-up');
              }, index * 100);
            });
            observer.unobserve(entry.target);
          }
        });
      },
      { threshold: 0.1 }
    );

    if (sectionRef.current) {
      observer.observe(sectionRef.current);
    }

    return () => observer.disconnect();
  }, []);

  return (
    <section id="deep-dive" ref={sectionRef} className="py-24 lg:py-32 bg-slate-900">
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="text-center mb-16 reveal-dive opacity-0">
          <Badge className="mb-4 bg-orange-500/10 text-orange-400 border-orange-500/30 hover:bg-orange-500/20 px-4 py-1.5 text-xs font-semibold tracking-wider uppercase">
            Deep Dive Técnico
          </Badge>
          <h2 className="font-display font-bold text-3xl sm:text-4xl lg:text-5xl text-white mb-4">
            Cálculos e Estimativas Reais
          </h2>
          <div className="w-16 h-1 bg-gradient-to-r from-orange-500 to-teal-500 mx-auto rounded-full mb-6" />
          <p className="text-slate-400 text-lg max-w-2xl mx-auto">
            Transparência total: veja como chegamos às cifras de autonomia, carregamento e armazenamento do RunVision Pro.
          </p>
        </div>

        <div className="grid md:grid-cols-2 gap-6 lg:gap-8">
          {calculations.map((calc, index) => {
            const Icon = calc.icon;
            return (
              <Card key={index} className="reveal-dive opacity-0 bg-slate-800/40 border-slate-700 hover:border-slate-500 transition-all duration-300">
                <CardHeader className="flex flex-row items-center gap-4 space-y-0">
                  <div className={`w-12 h-12 rounded-lg bg-slate-700/50 flex items-center justify-center`}>
                    <Icon className="w-6 h-6 text-white" />
                  </div>
                  <div>
                    <CardTitle className="text-white text-xl">{calc.title}</CardTitle>
                    <p className="text-slate-500 text-sm font-mono">{calc.formula}</p>
                  </div>
                </CardHeader>
                <CardContent>
                  {calc.modes ? (
                    <div className="space-y-3">
                      <div className="grid grid-cols-3 text-xs font-semibold text-slate-500 uppercase tracking-wider pb-2 border-b border-slate-700/50">
                        <span>Modo</span>
                        <span>Corrente</span>
                        <span className="text-right">Autonomia</span>
                      </div>
                      {calc.modes.map((mode, mIdx) => (
                        <div key={mIdx} className="grid grid-cols-3 text-sm py-1">
                          <span className="text-slate-300">{mode.name}</span>
                          <span className="text-slate-400 font-mono">{mode.current}</span>
                          <span className="text-orange-400 font-mono text-right">{mode.autonomy}</span>
                        </div>
                      ))}
                    </div>
                  ) : (
                    <div className="space-y-4">
                      <ul className="space-y-2">
                        {calc.steps?.map((step, sIdx) => (
                          <li key={sIdx} className="flex items-center gap-2 text-sm text-slate-400">
                            <div className="w-1.5 h-1.5 rounded-full bg-slate-600" />
                            {step}
                          </li>
                        ))}
                      </ul>
                      <div className="pt-4 border-t border-slate-700/50">
                        <p className="text-teal-400 font-semibold">{calc.result}</p>
                      </div>
                    </div>
                  )}
                </CardContent>
              </Card>
            );
          })}
        </div>

        <div className="mt-12 reveal-dive opacity-0">
          <div className="bg-orange-500/5 border border-orange-500/20 rounded-2xl p-6 text-center">
            <p className="text-slate-400 text-sm italic">
              * Nota: 8h em modo otimizado (GPS 1 Hz, brilho reduzido). Em sessões com GPS em alta taxa de atualização e sincronização Wi-Fi contínua, a autonomia média é de 2–4 h.
            </p>
          </div>
        </div>
      </div>
    </section>
  );
}
