"use client";

import { useCallback, useEffect, useState } from "react";
import Link from "next/link";
import { ArrowRight } from "lucide-react";
import { site } from "@/content/site";
import { HeroGrantLine } from "@/components/home/HeroGrantLine";
import { LastYearWinnersScroll } from "@/components/home/LastYearWinnersScroll";
import { TopoCurvyExtend } from "@/components/brand/TopoCurvyExtend";
import { HeroTopographyBackground } from "@/components/home/HeroTopographyBackground";
import { HeroRiftParticles } from "@/components/home/HeroRiftParticles";
import { TopoProseSurface } from "@/components/layout/TopoProseSurface";
import { TopoSectionProvider } from "@/components/layout/TopoSectionContext";
import { ScrollReveal } from "@/components/motion/ScrollReveal";
import { Button } from "@/components/ui/button";
import { cn } from "@/lib/utils";

const INTRO_MS = 10000;

export function Hero() {
  const [reduceMotion, setReduceMotion] = useState(false);
  const [introPhase, setIntroPhase] = useState<"intro" | "settled" | "static">("intro");
  const [heroHover, setHeroHover] = useState(false);
  const [hoverPoint, setHoverPoint] = useState({ x: 50, y: 50 });

  const handleHeroPointerMove = useCallback(
    (e: React.MouseEvent<HTMLElement>) => {
      const rect = e.currentTarget.getBoundingClientRect();
      setHoverPoint({
        x: ((e.clientX - rect.left) / rect.width) * 100,
        y: ((e.clientY - rect.top) / rect.height) * 100,
      });
      setHeroHover(true);
    },
    []
  );

  const handleHeroPointerLeave = useCallback(() => {
    setHeroHover(false);
  }, []);

  useEffect(() => {
    const mq = window.matchMedia("(prefers-reduced-motion: reduce)");
    const apply = () => {
      const reduced = mq.matches;
      setReduceMotion(reduced);
      if (reduced) setIntroPhase("static");
    };
    apply();
    mq.addEventListener("change", apply);

    if (!mq.matches) {
      const t = window.setTimeout(() => setIntroPhase("settled"), INTRO_MS);
      return () => {
        clearTimeout(t);
        mq.removeEventListener("change", apply);
      };
    }
    return () => mq.removeEventListener("change", apply);
  }, []);

  return (
    <section
      id="hero"
      data-section-hero
      className="section-white relative isolate min-h-[min(100svh,900px)] overflow-x-hidden overflow-y-visible bg-white"
      onMouseMove={handleHeroPointerMove}
      onMouseLeave={handleHeroPointerLeave}
    >
      <HeroTopographyBackground
        introPhase={introPhase}
        hoverActive={heroHover && !reduceMotion}
        hoverX={hoverPoint.x}
        hoverY={hoverPoint.y}
        className="absolute inset-0"
      />
      <TopoCurvyExtend />
      <HeroRiftParticles
        active={!reduceMotion}
        className="pointer-events-none absolute inset-0 z-[15]"
      />

      <TopoSectionProvider tone="light">
      <div className="topo-content-layer topo-content-readable relative z-20 mx-auto flex min-h-[min(100svh,900px)] w-full max-w-6xl flex-col items-center justify-center px-4 py-24 text-center md:px-6">
        <TopoProseSurface className="mx-auto flex w-full max-w-4xl flex-col items-center text-center">
        <ScrollReveal immediate variant="fade-up" delay={0}>
          <p className="text-xs font-semibold uppercase tracking-[0.2em] text-[#37a47a]/80 md:text-sm">
            {site.dates.label} · {site.venue.address}
          </p>
        </ScrollReveal>

        <ScrollReveal immediate variant="fade-up" delay={200}>
          <h1
            className={cn(
              "rift-hero-heading rift-hero-title mt-6 font-display text-3xl font-bold leading-[1.05] tracking-tight text-[#30614c] sm:text-4xl md:text-5xl lg:text-6xl"
            )}
          >
            <span className="font-wordmark block uppercase tracking-wide">
              Great Rift Valley
            </span>
            <span className="mt-1 block text-[#37a47a]">Innovation Summit</span>
          </h1>
        </ScrollReveal>

        <ScrollReveal immediate variant="fade-up" delay={400}>
          <p className="mx-auto mt-6 max-w-2xl text-lg text-[#37a47a]/80 md:text-xl">
            {site.tagline} Presented by {site.presentedBy}.
          </p>
        </ScrollReveal>

        <ScrollReveal immediate variant="fade-up" delay={500}>
          <div className="mt-8 flex flex-wrap items-center justify-center gap-3">
            <Button
              className="rounded-full bg-[#37a47a] px-8 text-[#ffffff] hover:bg-[#37a47a]/90"
              asChild
            >
              <Link href={site.links.pitchApplyUrl}>
                Register <ArrowRight className="size-4" />
              </Link>
            </Button>
            <Button
              variant="outline"
              className="rounded-full border-[#37a47a]/30 bg-white/80 text-[#37a47a] backdrop-blur-sm"
              asChild
            >
              <Link href="/payment">Get tickets</Link>
            </Button>
          </div>
          <p className="mt-4 text-sm text-[#37a47a]/70">
            <HeroGrantLine />
          </p>
        </ScrollReveal>
        </TopoProseSurface>

        <LastYearWinnersScroll variant="on-light" className="w-full max-w-5xl" />
      </div>
      </TopoSectionProvider>
    </section>
  );
}