import type { ReactNode } from "react";
import Link from "next/link";
import { ChevronDown } from "lucide-react";
import Nav from "@/components/nav";
import Footer from "@/components/footer";
import RelatedTools from "@/components/related-tools";

export type FaqItem = {
  q: string;
  a: string;
};

type SubpageLayoutProps = {
  toolSlug: string;
  toolName: string;
  h1Title: string;
  introText: string;
  steps: string[];
  examples: string[];
  vorteileText: ReactNode;
  additionalContent?: ReactNode;
  faqs: FaqItem[];
  updatedDate: string;
  children: ReactNode;
};

export default function SubpageLayout({
  toolSlug,
  toolName,
  h1Title,
  introText,
  steps,
  examples,
  vorteileText,
  additionalContent,
  faqs,
  updatedDate,
  children,
}: SubpageLayoutProps) {
  const howItWorksName =
    toolSlug === "muenze-werfen" ? "der Münzwurf" : toolName;

  return (
    <>
      <Nav />
      <main className="relative flex-1 pt-16 overflow-hidden">
        {/* Full-width Viewport Background: Architektonisches Grid & Geometrie-Muster (wie im Referenzbild) mit sanftem Übergang nach unten */}
        <div
          aria-hidden
          className="pointer-events-none absolute inset-x-0 top-0 -z-10 h-[620px] w-full overflow-hidden [mask-image:linear-gradient(to_bottom,black_45%,transparent_98%)]"
        >
          {/* Weiche Aquarell-Glows (einheitlich in Salbeigrün) */}
          <div className="absolute top-8 left-[12%] h-72 w-72 rounded-full bg-[#8da399]/20 blur-3xl" />
          <div className="absolute top-48 left-[50%] h-64 w-64 rounded-full bg-[#8da399]/18 blur-3xl" />

          {/* Vektor-Muster: Feines architektonisches Raster, Kreise & Punkte */}
          <svg
            className="absolute inset-0 h-full w-full opacity-75"
            width="100%"
            height="100%"
            xmlns="http://www.w3.org/2000/svg"
          >
            <defs>
              <pattern
                id="archPattern"
                width="160"
                height="160"
                patternUnits="userSpaceOnUse"
              >
                {/* Feine Rasterlinien */}
                <line x1="0" y1="0" x2="160" y2="0" stroke="#747874" strokeWidth="0.5" strokeOpacity="0.22" />
                <line x1="0" y1="80" x2="160" y2="80" stroke="#747874" strokeWidth="0.5" strokeOpacity="0.15" strokeDasharray="4 4" />
                <line x1="0" y1="0" x2="0" y2="160" stroke="#747874" strokeWidth="0.5" strokeOpacity="0.22" />
                <line x1="80" y1="0" x2="80" y2="160" stroke="#747874" strokeWidth="0.5" strokeOpacity="0.15" strokeDasharray="4 4" />
                
                {/* Diagonale feine Hilfslinien */}
                <line x1="0" y1="0" x2="160" y2="160" stroke="#8da399" strokeWidth="0.4" strokeOpacity="0.15" />

                {/* Geometrische Bögen & Kreise */}
                <circle cx="80" cy="80" r="50" stroke="#8da399" strokeWidth="0.5" strokeOpacity="0.3" fill="none" />
                <circle cx="80" cy="80" r="75" stroke="#8da399" strokeWidth="0.4" strokeOpacity="0.2" strokeDasharray="2 4" fill="none" />
                <circle cx="0" cy="0" r="40" stroke="#8da399" strokeWidth="0.4" strokeOpacity="0.22" fill="none" />

                {/* Punkte auf den Schnittstellen */}
                <circle cx="80" cy="80" r="2" fill="#707a65" fillOpacity="0.5" />
                <circle cx="0" cy="0" r="2.2" fill="#707a65" fillOpacity="0.45" />
                <circle cx="160" cy="0" r="1.6" fill="#707a65" fillOpacity="0.4" />
                <circle cx="0" cy="160" r="1.6" fill="#707a65" fillOpacity="0.4" />
                <circle cx="160" cy="160" r="2.2" fill="#707a65" fillOpacity="0.45" />

                <circle cx="80" cy="30" r="1.6" fill="#8da399" fillOpacity="0.45" />
                <circle cx="80" cy="130" r="1.6" fill="#8da399" fillOpacity="0.45" />
                <circle cx="30" cy="80" r="1.6" fill="#8da399" fillOpacity="0.4" />
                <circle cx="130" cy="80" r="1.6" fill="#8da399" fillOpacity="0.4" />
              </pattern>
            </defs>
            <rect width="100%" height="100%" fill="url(#archPattern)" />
          </svg>
        </div>

        <div className="relative mx-auto w-full max-w-6xl px-5 py-12 sm:px-8 sm:py-16 md:py-20">
          {/* Header Section ohne Container-Box */}
          <header className="relative max-w-3xl mb-12 sm:mb-16">
            <nav
              aria-label="Breadcrumb"
              className="flex items-center gap-2 mb-3 text-xs font-semibold uppercase tracking-widest text-ink-soft"
            >
              <Link href="/" className="hover:text-[#c97d60] transition-colors">
                Entscheidomat
              </Link>
              <span className="text-line">/</span>
              <span className="text-ink font-medium">{toolName}</span>
            </nav>

            <h1 className="font-display text-4xl sm:text-5xl lg:text-6xl font-semibold leading-[1.15] tracking-tight text-ink mb-4">
              {h1Title}
            </h1>

            <p className="text-base sm:text-lg text-ink-soft leading-relaxed">
              {introText}
            </p>
          </header>

          {/* Main Interactive Tool Container */}
          <section className="mb-14 sm:mb-20 rounded-3xl border border-line bg-surface p-6 sm:p-8 md:p-10 shadow-lift relative overflow-hidden">
            {children}
          </section>

          {/* 2-Column Content Structure: Explanations & FAQ */}
          <div className="grid grid-cols-1 lg:grid-cols-12 gap-10 lg:gap-14">
            {/* Left Column: Guide & Info */}
            <div className="lg:col-span-7 space-y-10">
              <article>
                <h2 className="font-display text-2xl sm:text-3xl font-semibold text-ink mb-4">
                  So funktioniert {howItWorksName.toLowerCase().startsWith("der") || howItWorksName.toLowerCase().startsWith("das") || howItWorksName.toLowerCase().startsWith("die") ? howItWorksName : `das ${howItWorksName}`}
                </h2>
                <ol className="space-y-3 text-base text-ink-soft pl-4 border-l-2 border-[#c97d60]/40">
                  {steps.map((step, idx) => (
                    <li key={idx} className="pl-2">
                      <span className="font-semibold text-ink">{idx + 1}. </span>
                      {step}
                    </li>
                  ))}
                </ol>
              </article>

              <article>
                <h2 className="font-display text-2xl sm:text-3xl font-semibold text-ink mb-4">
                  Beispiele
                </h2>
                <ul className="space-y-2 text-base text-ink-soft list-disc pl-5">
                  {examples.map((ex, idx) => (
                    <li key={idx}>{ex}</li>
                  ))}
                </ul>
              </article>

              <article>
                <h2 className="font-display text-2xl sm:text-3xl font-semibold text-ink mb-4">
                  Vorteile und Grenzen
                </h2>
                <div className="text-base text-ink-soft leading-relaxed">
                  {vorteileText}
                </div>
              </article>

              {additionalContent}

              <article className="p-6 sm:p-7 bg-paper/90 rounded-2xl border border-line shadow-soft">
                <h2 className="font-display text-xl font-semibold text-ink mb-3">
                  Verwandte Tools
                </h2>
                <RelatedTools current={toolSlug} />
              </article>
            </div>

            {/* Right Column: FAQ Accordion */}
            <div className="lg:col-span-5">
              <h2 className="font-display text-2xl sm:text-3xl font-semibold text-ink mb-6">
                Häufige Fragen
              </h2>
              <div className="space-y-3">
                {faqs.map((faq) => (
                  <details
                    key={faq.q}
                    className="group rounded-2xl border border-line bg-surface transition-colors hover:border-[#c97d60]/40 [&_summary::-webkit-details-marker]:hidden"
                  >
                    <summary className="flex cursor-pointer items-center justify-between gap-3 p-4 sm:p-5 font-display text-base font-semibold text-ink">
                      <span>{faq.q}</span>
                      <span className="shrink-0 text-ink-soft transition-transform duration-300 group-open:rotate-180">
                        <ChevronDown className="h-5 w-5" />
                      </span>
                    </summary>
                    <div className="px-4 pb-4 sm:px-5 sm:pb-5 text-sm sm:text-base leading-relaxed text-ink-soft border-t border-line/50 pt-3 mt-1">
                      {faq.a}
                    </div>
                  </details>
                ))}
              </div>
              <p className="mt-6 text-xs text-ink-soft">
                Zuletzt aktualisiert: {updatedDate}
              </p>
            </div>
          </div>
        </div>
      </main>
      <Footer />
    </>
  );
}
