import { useNavigate } from "react-router-dom";
import { ArrowRight } from "lucide-react";
import React, { useState, useEffect, useRef, lazy, Suspense } from "react";
import { useTheme } from "next-themes";
import { useQuery } from "@tanstack/react-query";
import CountUp from "@/components/CountUp";
import { trackCtaClick } from "@/lib/analytics";
import { fetchProjects } from "@/lib/projects";

// WebGL-Effekte als eigene Chunks laden, damit der Text nicht auf three.js/ogl warten muss
const Silk = lazy(() => import("@/components/Silk"));

const SPARKLE_SVG = (
  <svg className="btn-svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden>
    <path
      strokeLinecap="round"
      strokeLinejoin="round"
      d="M9.813 15.904 9 18.75l-.813-2.846a4.5 4.5 0 0 0-3.09-3.09L2.25 12l2.846-.813a4.5 4.5 0 0 0 3.09-3.09L9 5.25l.813 2.846a4.5 4.5 0 0 0 3.09 3.09L15.75 12l-2.846.813a4.5 4.5 0 0 0-3.09 3.09ZM18.259 8.715 18 9.75l-.259-1.035a3.375 3.375 0 0 0-2.455-2.456L14.25 6l1.036-.259a3.375 3.375 0 0 0 2.455-2.456L18 2.25l.259 1.035a3.375 3.375 0 0 0 2.456 2.456L21.75 6l-1.035.259a3.375 3.375 0 0 0-2.456 2.456ZM16.894 20.567 16.5 21.75l-.394-1.183a2.25 2.25 0 0 0-1.423-1.423L13.5 18.75l1.183-.394a2.25 2.25 0 0 0 1.423-1.423l.394-1.183.394 1.183a2.25 2.25 0 0 0 1.423 1.423l1.183.394-1.183.394a2.25 2.25 0 0 0-1.423 1.423Z"
    />
  </svg>
);

function DemoButtonLetters({ text }: { text: string }) {
  const chars = text.split("");
  return (
    <>
      {chars.map((char, i) => (
        <span key={i} className={char === " " ? "btn-letter btn-letter-space" : "btn-letter"}>
          {char}
        </span>
      ))}
    </>
  );
}

const FOUNDING_DATE = new Date("2026-01-25"); // Samstag, 25. Januar 2026

const Hero = () => {
  const navigate = useNavigate();
  const { resolvedTheme } = useTheme();
  const [companyAge, setCompanyAge] = useState("");
  const secondBtnRef = useRef<HTMLButtonElement>(null);

  // Projektzähler kommt live aus Gitea – gleicher queryKey wie im Abschnitt
  // „Projekte", react-query teilt sich den einen Request.
  const { data: projectsSnapshot } = useQuery({
    queryKey: ["projects"],
    queryFn: ({ signal }) => fetchProjects(signal),
    staleTime: 5 * 60 * 1000,
    refetchOnWindowFocus: false,
    retry: 1,
  });
  const projectCount = projectsSnapshot?.total ?? 10;

  useEffect(() => {
    const calculateAge = () => {
      const now = new Date();
      const diff = now.getTime() - FOUNDING_DATE.getTime();
      
      const totalSeconds = Math.floor(diff / 1000);
      const days = Math.floor(totalSeconds / (60 * 60 * 24));
      const hours = Math.floor((totalSeconds % (60 * 60 * 24)) / (60 * 60));
      
      const years = Math.floor(days / 365);
      const remainingDays = days % 365;
      
      if (years > 0) {
        setCompanyAge(`${years}J ${remainingDays}T ${hours}h`);
      } else {
        setCompanyAge(`${days}T ${hours}h`);
      }
    };

    calculateAge();
    const interval = setInterval(calculateAge, 60 * 60 * 1000); // Update every hour (only days/hours shown)

    return () => clearInterval(interval);
  }, []);

  // ── Silk-Hintergrund Farben ──
  const isDark = resolvedTheme === "dark";
  // Silk: Hauptfarbe (Wellenspitzen)
  const silkColor = isDark ? "#6a6a6a" : "#ffffff";
  // Silk: Zweite Farbe (Wellentäler)
  const silkColor2 = isDark ? "#000000" : "#c0c0c0";
  // Silk: Rausch-Intensität
  const silkNoise = isDark ? 4 : 1.5;

  return (
    <section className="relative min-h-screen flex flex-col justify-center overflow-hidden pt-20">
      {/* Silk animated background */}
      <div className="absolute inset-0 z-0 w-full h-full">
        <Suspense fallback={null}>
          {/* sanft einblenden, weil der Hintergrund jetzt kurz nach dem Text kommt */}
          <div className="w-full h-full animate-fade-in">
            <Silk
              speed={3}
              scale={0.5}
              color={silkColor}
              color2={silkColor2}
              noiseIntensity={silkNoise}
              rotation={0}
            />
          </div>
        </Suspense>
      </div>

      <div className="container mx-auto px-6 relative z-10">
        <div className="max-w-6xl">
          {/* Label */}
          <div className="label-tag mb-8 animate-fade-in" style={{ animationDelay: '0.1s' }}>
            Digitalisierung für KMU
          </div>

          {/* Main Heading - Large Uppercase */}
          <h1 className="text-5xl sm:text-6xl md:text-7xl lg:text-8xl xl:text-9xl font-display font-medium text-foreground mb-6 leading-[0.95] tracking-tighter uppercase animate-slide-up" style={{ animationDelay: '0.2s' }}>
            Wir digitalisieren<br />
            <span className="text-muted-foreground">Ihr Unternehmen</span>
          </h1>

          {/* Subheadline */}
          <p className="text-xl md:text-2xl text-foreground/90 max-w-3xl mb-6 font-medium animate-fade-in" style={{ animationDelay: '0.3s' }}>
            Website, Automatisierung und vernetzte Prozesse – aus einer Hand. So wächst Ihr Unternehmen, ohne dass Ihr Team mehr Aufwand im Alltag hat.
          </p>

          {/* CTA Buttons */}
          <div className="flex flex-col sm:flex-row flex-nowrap items-stretch sm:items-center gap-3 sm:gap-4 mb-6 animate-fade-in" style={{ animationDelay: '0.5s' }}>
            <div className="btn-wrapper shrink-0 w-full sm:w-auto">
              <button
                type="button"
                className="btn btn-primary w-full sm:w-auto justify-center"
                onClick={() => {
                  trackCtaClick("Kostenlose Potenzialanalyse sichern", "hero");
                  navigate("/kontakt");
                }}
                aria-label="Kostenlose Potenzialanalyse sichern"
              >
                <ArrowRight className="btn-icon" size={24} strokeWidth={2} aria-hidden />
                <div className="txt-wrapper">
                  <span className="txt-width-helper" aria-hidden="true">
                    <DemoButtonLetters text="Kostenlose Potenzialanalyse sichern" />
                  </span>
                  <div className="txt-1">
                    <DemoButtonLetters text="Kostenlose Potenzialanalyse sichern" />
                  </div>
                  <div className="txt-2">
                    <DemoButtonLetters text="Wird weitergeleitet..." />
                  </div>
                </div>
              </button>
            </div>
            <div className="btn-wrapper w-full sm:w-auto">
              <button
                ref={secondBtnRef}
                type="button"
                className="btn w-full sm:w-auto justify-center"
                onClick={() => {
                  const el = document.getElementById("projects");
                  if (el) el.scrollIntoView({ behavior: "smooth" });
                  else navigate("/#projects");
                }}
                aria-label="Projekte ansehen"
              >
                {SPARKLE_SVG}
                <div className="txt-wrapper">
                  <span className="txt-width-helper" aria-hidden="true">
                    <DemoButtonLetters text="Projekte ansehen" />
                  </span>
                  <div className="txt-1">
                    <DemoButtonLetters text="Projekte ansehen" />
                  </div>
                  <div className="txt-2">
                    <DemoButtonLetters text="Wird geladen..." />
                  </div>
                </div>
              </button>
            </div>
          </div>

          {/* Trust Line */}
          <p className="text-sm text-muted-foreground/70 uppercase tracking-wider animate-fade-in" style={{ animationDelay: '0.55s' }}>
            Für Unternehmen, die nicht stehen bleiben wollen.
          </p>
        </div>
      </div>

      {/* Bottom Stats Row */}
      <div className="container mx-auto px-6 mt-auto pb-12 pt-20 relative z-10">
        <div className="divider mb-12" />
        <div className="grid grid-cols-2 md:grid-cols-4 gap-8 md:gap-12">
          <div className="animate-fade-in" style={{ animationDelay: '0.6s' }}>
            <div className="stat-number text-4xl md:text-5xl text-foreground mb-2">
              <CountUp
                from={0}
                to={projectCount}
                direction="up"
                duration={1.2}
                className="count-up-text"
                startWhen={true}
                suffix="+"
              />
            </div>
            <div className="label-tag">Projekte</div>
          </div>
          <div className="animate-fade-in" style={{ animationDelay: '0.7s' }}>
            <div className="stat-number text-4xl md:text-5xl text-foreground mb-2">{companyAge}</div>
            <div className="label-tag">Am Markt</div>
          </div>
          <div className="animate-fade-in" style={{ animationDelay: '0.8s' }}>
            <div className="stat-number text-4xl md:text-5xl text-foreground mb-2">
              <CountUp
                from={0}
                to={99.9}
                direction="up"
                duration={1.5}
                className="count-up-text"
                startWhen={true}
                suffix="%"
              />
            </div>
            <div className="label-tag">Systemverfügbarkeit</div>
          </div>
          <div className="animate-fade-in" style={{ animationDelay: '0.9s' }}>
            <div className="stat-number text-4xl md:text-5xl text-foreground mb-2">🇩🇪</div>
            <div className="label-tag">Serverstandort in Deutschland</div>
          </div>
        </div>
      </div>
    </section>
  );
};

export default Hero;