'use client';

import { useState, useEffect } from 'react';
import { motion } from 'framer-motion';
import { Container } from '@/components/ui/Container';
import { Button } from '@/components/ui/Button';
import { HoverShineOverlay } from '@/components/ui/HoverShineOverlay';
import { AnimatedGlossyBorder } from '@/components/ui/AnimatedGlossyBorder';
import { FileText, Award, Download, ShieldCheck } from 'lucide-react';
import { LogoArcs } from '@/components/ui/LogoArcs';

interface Certificate {
  title: string;
  description: string;
  pdfUrl: string;
  type: 'iso' | 'tax' | 'general';
  date?: string;
}

interface CertificatesBlockProps {
  badge?: string;
  title?: string;
  description?: string;
  certificates?: Certificate[];
  hideHeader?: boolean;
}

const defaultCertificates: Certificate[] = [
  {
    title: 'ISO 14001:2015',
    description: 'Umweltmanagementsystem',
    pdfUrl: '/assets/certificates/231214_Zertifikat ISO 14001 Umweltmanagement.pdf',
    type: 'iso',
    date: '14.12.2023',
  },
  {
    title: 'ISO 9001:2015',
    description: 'Qualitätsmanagementsystem',
    pdfUrl: '/assets/certificates/231214_Zertifikat ISO 9001 Qualitätsmanagement.pdf',
    type: 'iso',
    date: '14.12.2023',
  },
  {
    title: 'DIN EN ISO 45001:2018',
    description: 'Arbeits- und Gesundheitsschutz',
    pdfUrl: '/assets/certificates/Zertifizierung DIN EN ISO 45001 bis 05122028.pdf',
    type: 'iso',
    date: '05.12.2025', // Assuming valid till
  },
  {
    title: 'Freistellungsbescheinigung',
    description: 'Nach § 48 b EStG',
    pdfUrl: '/assets/certificates/240209_Freistellungsbescheinigung § 48 b.pdf',
    type: 'tax',
    date: '09.02.2024',
  },
  {
    title: 'Nachweis § 13b UStG',
    description: 'Steuerschuldnerschaft des Leistungsempfängers',
    pdfUrl: '/assets/certificates/240209_Nachweis § 13 b.pdf',
    type: 'tax',
    date: '09.02.2024',
  },
  {
    title: 'Bescheinigung in Steuersachen',
    description: 'Zertifikat des Finanzamtes',
    pdfUrl: '/assets/certificates/250213_Bescheinigung in Steuersachen.pdf',
    type: 'tax',
    date: '13.02.2025',
  },
];

export function CertificatesBlock({ badge, title, description, certificates = defaultCertificates, hideHeader = false }: CertificatesBlockProps) {
  const [isMounted, setIsMounted] = useState(false);

  useEffect(() => {
    setIsMounted(true);
  }, []);

  const badgeText = badge || 'Zertifizierungen & Nachweise';
  const titleText = title || 'Geprüfte Qualität und Sicherheit';
  const descriptionText = description || 'Transparenz und höchste Standards sind das Fundament unserer Arbeit. Hier finden Sie unsere aktuellen Zertifikate und Bescheinigungen als PDF-Download.';

  const containerVariants = {
    hidden: { opacity: 0 },
    show: {
      opacity: 1,
      transition: {
        staggerChildren: 0.1,
      },
    },
  };

  const itemVariants = {
    hidden: { opacity: 0, y: 20 },
    show: { opacity: 1, y: 0, transition: { duration: 0.5, ease: 'easeOut' as const } },
  };

  if (!isMounted) {
    return (
      <section className="py-24 bg-neutral-50 relative overflow-hidden">
        <Container>
          {!hideHeader && (
            <div className="text-center max-w-3xl mx-auto mb-16">
              <h2 className="text-primary font-bold tracking-wider uppercase text-sm mb-3">{badgeText}</h2>
              <h3 className="font-heading text-3xl md:text-5xl font-extrabold text-neutral-dark mb-6">{titleText}</h3>
              <p className="text-lg text-neutral-600">{descriptionText}</p>
            </div>
          )}
        </Container>
      </section>
    );
  }

  return (
    <section className="py-24 bg-neutral-50 relative overflow-hidden">
      {/* Background Accents */}
      <div className="absolute top-0 right-0 w-1/3 h-full bg-primary/5 -skew-x-12 translate-x-1/2" />
      <div className="absolute bottom-0 left-0 w-1/4 h-1/2 bg-accent/5 skew-y-12 -translate-x-1/2 blur-3xl rounded-full" />

      <Container className="relative z-10">
        {!hideHeader && (
          <div className="text-center max-w-3xl mx-auto mb-16">
            <motion.div
              initial={{ opacity: 0, y: 20 }}
              whileInView={{ opacity: 1, y: 0 }}
              viewport={{ once: true }}
              transition={{ duration: 0.5 }}
            >
              <h2 className="text-primary font-bold tracking-wider uppercase text-sm mb-3">{badgeText}</h2>
              <h3 className="font-heading text-3xl md:text-5xl font-extrabold text-neutral-dark mb-6">{titleText}</h3>
              <p className="text-lg text-neutral-600">{descriptionText}</p>
            </motion.div>
          </div>
        )}

        <motion.div 
          className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6"
          variants={containerVariants}
          initial="hidden"
          whileInView="show"
          viewport={{ once: true, margin: "-50px" }}
        >
          {certificates.map((cert, index) => {
            const isIso = cert.type === 'iso';
            
            return (
              <motion.a
                key={index}
                href={cert.pdfUrl}
                target="_blank"
                rel="noopener noreferrer"
                variants={itemVariants}
                className={`group relative rounded-2xl p-8 flex flex-col justify-between overflow-hidden transition-all duration-500 hover:shadow-xl hover:-translate-y-1 border ${
                  isIso 
                    ? 'bg-neutral-dark text-white border-neutral-800 shadow-lg' 
                    : 'bg-white text-neutral-dark border-neutral-200 shadow-md'
                }`}
              >
                {/* Background Decorative Elements */}
                <div className={`absolute top-0 right-0 w-32 h-32 blur-3xl rounded-full -mr-10 -mt-10 transition-colors duration-500 ${
                  isIso ? 'bg-primary/20 group-hover:bg-primary/40' : 'bg-primary/10 group-hover:bg-primary/20'
                }`} />

                {isIso && (
                  <div className="absolute -bottom-[20%] -right-[20%] w-[100%] h-[100%] z-0 opacity-10 group-hover:opacity-20 transition-opacity duration-1000 pointer-events-none mix-blend-overlay">
                    <LogoArcs className="w-full h-full text-white animate-[spin_60s_linear_infinite]" />
                  </div>
                )}
                
                <HoverShineOverlay shineColor={isIso ? 'via-white/20' : 'via-black/5'} />
                <AnimatedGlossyBorder color={isIso ? 'primary' : 'primary'} className="opacity-0 group-hover:opacity-100 transition-opacity duration-700" borderWidth={2} />

                <div className="relative z-10 flex flex-col h-full">
                  <div className="flex justify-between items-start mb-8">
                    <div className={`p-3 rounded-xl inline-flex ${
                      isIso ? 'bg-primary/20 text-primary-light backdrop-blur-md' : 'bg-primary/10 text-primary'
                    }`}>
                      {isIso ? <Award size={28} /> : <ShieldCheck size={28} />}
                    </div>
                    {cert.date && (
                      <span className={`text-xs font-bold uppercase tracking-wider px-3 py-1 rounded-full ${
                        isIso ? 'bg-neutral-800 text-neutral-400 border border-neutral-700' : 'bg-neutral-100 text-neutral-500 border border-neutral-200'
                      }`}>
                        {cert.date}
                      </span>
                    )}
                  </div>

                  <div>
                    <h4 className={`text-xl font-bold mb-2 ${isIso ? 'text-white' : 'text-neutral-dark'}`}>
                      {cert.title}
                    </h4>
                    <p className={`text-sm mb-6 ${isIso ? 'text-neutral-400' : 'text-neutral-600'}`}>
                      {cert.description}
                    </p>
                  </div>

                  <div className={`mt-auto inline-flex items-center text-sm font-bold uppercase tracking-wider group-hover:gap-3 transition-all ${
                    isIso ? 'text-primary-light' : 'text-primary'
                  }`}>
                    <span>Download PDF</span>
                    <Download size={16} className="ml-2 group-hover:translate-y-0.5 transition-transform" />
                  </div>
                </div>
              </motion.a>
            );
          })}
        </motion.div>
      </Container>
    </section>
  );
}