"use client";

import React, { useMemo } from "react";
import { motion, AnimatePresence } from "motion/react";
import { 
  Calendar, MapPin, Briefcase, Zap, 
  Award, Users, Terminal, ChevronRight 
} from "lucide-react";
import { usePortfolioData } from "@/lib/usePortfolioData";

// --- Tipagem e Configuração (Otimização Pareto 80/20) ---
const CONFIG = {
  "innovo-tecnologia": { color: "text-blue-400", bg: "bg-blue-400/10", border: "border-blue-400/20" },
  "apolo-energia": { color: "text-emerald-400", bg: "bg-emerald-400/10", border: "border-emerald-400/20" },
  default: { color: "text-slate-400", bg: "bg-slate-400/10", border: "border-slate-400/20" }
};

export default function Experience() {
  const { data, loading, error } = usePortfolioData();

  // Memória: Evita re-processamento de regex em cada re-render (Princípio de Eficiência)
  const sortedExperiences = useMemo(() => {
    if (!data?.experiences) return [];
    return [...data.experiences]
      .filter((exp) => exp.featured)
      .sort((a, b) => {
        const yearA = parseInt(a.period.match(/\d{4}/)?.[0] || "0");
        const yearB = parseInt(b.period.match(/\d{4}/)?.[0] || "0");
        return yearB - yearA; // Da mais recente para a mais antiga (Padrão Senior)
      });
  }, [data]);

  if (loading) return <ExperienceSkeleton />;

  return (
    <section id="experience" className="relative py-32 bg-[#030712] overflow-hidden">
      <div className="max-w-6xl mx-auto px-6 relative">
        
        {/* Header com Identidade Visual */}
        <div className="mb-24">
          <motion.span 
            initial={{ opacity: 0 }}
            whileInView={{ opacity: 1 }}
            className="text-blue-500 font-mono text-sm tracking-[0.4em] uppercase"
          >
            System_History
          </motion.span>
          <h2 className="text-5xl md:text-7xl font-black text-white mt-4 tracking-tighter">
            Trajetória <br />
            <span className="text-slate-700">Profissional</span>
          </h2>
        </div>

        {/* Timeline Desktop (Linha Central) */}
        <div className="absolute left-[50%] top-[400px] bottom-0 w-[1px] bg-gradient-to-b from-blue-500/50 via-slate-800 to-transparent hidden lg:block" />

        <div className="space-y-12">
          <AnimatePresence>
            {sortedExperiences.map((exp, index) => (
              <ExperienceCard key={exp.id} exp={exp} index={index} />
            ))}
          </AnimatePresence>
        </div>
      </div>
    </section>
  );
}

// --- Sub-componente Card (Encapsulamento de Lógica de Transição) ---
function ExperienceCard({ exp, index }: { exp: any, index: number }) {
  const isEven = index % 2 === 0;
  const config = (CONFIG as any)[exp.company.toLowerCase().replace(/\s+/g, "-")] || CONFIG.default;

  return (
    <motion.div
      // CORREÇÃO DO BUG: viewport com margin e once garante que a animação termine
      initial={{ opacity: 0, y: 50 }}
      whileInView={{ opacity: 1, y: 0 }}
      viewport={{ once: true, amount: 0.3, margin: "0px 0px -100px 0px" }}
      transition={{ 
        duration: 0.8, 
        delay: index * 0.1,
        ease: [0.16, 1, 0.3, 1] // Custom Ease-Out para suavidade premium
      }}
      className={`relative flex flex-col ${isEven ? 'lg:flex-row' : 'lg:flex-row-reverse'} items-center gap-8 lg:gap-16`}
    >
      {/* Indicador de Data na Timeline */}
      <div className="hidden lg:flex flex-1 justify-end items-center">
        <div className={`${isEven ? 'text-right' : 'text-left'} flex-1`}>
          <span className="text-2xl font-mono font-bold text-slate-800 tracking-tighter group-hover:text-blue-500 transition-colors">
            {exp.period.split(' ')[0]}
          </span>
        </div>
      </div>

      {/* Card Principal */}
      <div className="flex-1 w-full">
        <motion.div 
          whileHover={{ y: -5 }} // Hover sutil sem quebrar o layout
          className={`p-8 rounded-3xl bg-slate-900/40 border ${config.border} backdrop-blur-xl relative overflow-hidden group transition-all`}
        >
          {/* Badge de Empresa */}
          <div className="flex flex-wrap justify-between items-start gap-4 mb-6">
            <div className="space-y-1">
              <h3 className="text-2xl font-bold text-white group-hover:text-blue-400 transition-colors">
                {exp.title}
              </h3>
              <div className="flex items-center gap-2">
                <span className={`text-sm font-bold uppercase tracking-widest ${config.color}`}>
                  {exp.company}
                </span>
                <span className="text-slate-600">•</span>
                <span className="text-xs text-slate-500 font-mono">{exp.type}</span>
              </div>
            </div>
            
            <div className={`px-4 py-1.5 rounded-full ${config.bg} border ${config.border} text-[10px] font-bold text-white uppercase`}>
              {exp.period}
            </div>
          </div>

          <p className="text-slate-400 leading-relaxed mb-8 text-sm">
            {exp.description}
          </p>

          {/* Conquistas (Técnica de Checklist de Engenharia) */}
          <div className="grid grid-cols-1 gap-3 mb-8">
            {exp.achievements?.map((ach: string, i: number) => (
              <div key={i} className="flex gap-3 text-sm text-slate-300 group/item">
                <ChevronRight className={`w-4 h-4 mt-0.5 flex-shrink-0 transition-transform group-hover/item:translate-x-1 ${config.color}`} />
                <span>{ach}</span>
              </div>
            ))}
          </div>

          {/* Tags de Tech (Aparência de Chip de Hardware) */}
          <div className="flex flex-wrap gap-2 pt-6 border-t border-slate-800/50">
            {exp.technologies?.map((tech: string) => (
              <span key={tech} className="px-3 py-1 bg-slate-950 border border-slate-800 text-slate-500 text-[10px] rounded-md font-mono hover:text-blue-400 hover:border-blue-400/30 transition-all">
                {tech}
              </span>
            ))}
          </div>
        </motion.div>
      </div>

      {/* Spacer para Timeline Desktop */}
      <div className="hidden lg:block flex-1" />
    </motion.div>
  );
}

function ExperienceSkeleton() {
  return <div className="h-96 flex items-center justify-center text-slate-600 font-mono animate-pulse">Loading_System_Nodes...</div>;
}