"use client";

import { useEffect, useRef, useCallback, useState } from "react";
import { Button } from "@/components/ui/Button";
import { FloatingHearts } from "@/components/ui/FloatingHearts";
import { HeroLogo } from "@/components/ui/HeroLogo";
import type { SiteContent } from "@/types/content";

const DEFAULT_VIDEOS = ["/video/ira.mp4", "/video/nadezda.mp4", "/video/nastya-2.mp4"];

interface HeroProps {
  data: SiteContent["hero"];
}

export function Hero({ data: hero }: HeroProps) {
  const sectionRef = useRef<HTMLElement>(null);
  const scrolledRef = useRef(false);
  const overlayRef = useRef<HTMLDivElement>(null);
  const readyCount = useRef(0);
  const [mounted, setMounted] = useState(false);
  const videos = hero.videos?.length ? hero.videos : DEFAULT_VIDEOS;
  const centerVideo = videos[Math.floor(videos.length / 2)] || videos[0];
  const totalVideos = videos.slice(0, 3).length + 1; // desktop (3) + mobile (1)

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

  const handleVideoReady = useCallback(() => {
    readyCount.current += 1;
    if (readyCount.current >= totalVideos && overlayRef.current) {
      overlayRef.current.style.opacity = "0";
    }
  }, [totalVideos]);

  const scrollToNext = useCallback(() => {
    const el = sectionRef.current;
    if (!el) return;
    let next = el.nextElementSibling;
    while (next && next.tagName !== "SECTION") {
      next = next.nextElementSibling;
    }
    next?.scrollIntoView({ behavior: "smooth" });
  }, []);

  useEffect(() => {
    const el = sectionRef.current;
    if (!el) return;

    function handleWheel(e: WheelEvent) {
      if (e.deltaY <= 0 || scrolledRef.current) return;
      if (window.scrollY > 10) return;
      scrolledRef.current = true;
      scrollToNext();
      setTimeout(() => { scrolledRef.current = false; }, 1000);
    }

    function handleTouchStart(e: TouchEvent) {
      (el as HTMLElement).dataset.touchY = String(e.touches[0].clientY);
    }

    function handleTouchEnd(e: TouchEvent) {
      const startY = Number((el as HTMLElement).dataset.touchY);
      const endY = e.changedTouches[0].clientY;
      if (startY - endY > 50 && !scrolledRef.current && window.scrollY < 10) {
        scrolledRef.current = true;
        scrollToNext();
        setTimeout(() => { scrolledRef.current = false; }, 1000);
      }
    }

    el.addEventListener("wheel", handleWheel, { passive: true });
    el.addEventListener("touchstart", handleTouchStart, { passive: true });
    el.addEventListener("touchend", handleTouchEnd, { passive: true });
    return () => {
      el.removeEventListener("wheel", handleWheel);
      el.removeEventListener("touchstart", handleTouchStart);
      el.removeEventListener("touchend", handleTouchEnd);
    };
  }, [scrollToNext]);

  return (
    <section id="hero" ref={sectionRef} className="relative flex min-h-svh items-center justify-center overflow-hidden bg-[#050505]">
      {/* Videos render only after hydration to avoid SSR mismatch */}
      {mounted && (
        <>
          {/* Mobile: single centered video */}
          <div className="absolute inset-0 md:hidden">
            <video
              autoPlay muted loop playsInline preload="auto"
              onCanPlayThrough={handleVideoReady}
              className="absolute inset-0 h-full w-full object-cover object-center"
            >
              <source src={centerVideo} type="video/mp4" />
            </video>
            <div className="absolute inset-0 bg-black/50" />
          </div>

          {/* Desktop: diagonal split with all videos */}
          <div className="absolute inset-0 hidden md:block">
            {videos.slice(0, 3).map((src, i) => {
              const positions = [
                { left: "0%", width: "38%" },
                { left: "31%", width: "38%" },
                { left: "62%", width: "38%" },
              ];
              const clips = [
                "polygon(0 0, 100% 0, 86% 100%, 0 100%)",
                "polygon(14% 0, 100% 0, 86% 100%, 0 100%)",
                "polygon(14% 0, 100% 0, 100% 100%, 0 100%)",
              ];
              return (
                <div
                  key={src}
                  className="absolute top-0 bottom-0 overflow-hidden"
                  style={{
                    left: positions[i].left,
                    width: positions[i].width,
                    clipPath: clips[i],
                  }}
                >
                  <video
                    autoPlay muted loop playsInline preload="auto"
                    onCanPlayThrough={handleVideoReady}
                    className="absolute inset-0 h-full w-full object-cover object-center"
                  >
                    <source src={src} type="video/mp4" />
                  </video>
                  <div className="absolute inset-0 bg-black/50" />
                </div>
              );
            })}
            {/* Gold diagonal lines between panels */}
            <svg className="absolute inset-0 h-full w-full z-10 pointer-events-none" preserveAspectRatio="none" viewBox="0 0 100 100">
              <line x1="38" y1="0" x2="33" y2="100" stroke="rgba(201,169,110,0.25)" strokeWidth="0.15" />
              <line x1="69" y1="0" x2="64" y2="100" stroke="rgba(201,169,110,0.25)" strokeWidth="0.15" />
            </svg>
          </div>
        </>
      )}

      {/* Loading overlay — covers videos but not content */}
      <div
        ref={overlayRef}
        className="absolute inset-0 z-[5] bg-[#050505] pointer-events-none transition-opacity duration-1000"
      />

      {/* Floating hearts */}
      <FloatingHearts />

      {/* Content */}
      <div className="section-container relative z-10 text-center">
        <div className="hero-logo relative mx-auto mb-10 flex items-center justify-center" style={{ width: 220, height: 181 }}>
          <div className="absolute -inset-10 rounded-full blur-[80px]" style={{ background: "radial-gradient(circle, rgba(201,169,110,0.25), transparent 70%)" }} />
          <div className="hero-logo-heartbeat relative">
            <HeroLogo
              size={220}
              className="drop-shadow-[0_0_10px_rgba(201,169,110,0.35)] drop-shadow-[0_0_40px_rgba(201,169,110,0.15)]"
            />
          </div>
        </div>

        <h1 className="hero-title font-display text-5xl font-bold tracking-tight sm:text-6xl lg:text-8xl">
          <span className="gradient-text">{hero.headline}</span>
        </h1>

        <p className="hero-subtitle mx-auto mt-6 max-w-lg text-lg text-[#b8a080] sm:text-xl">
          {hero.subheadline}
        </p>

        <div className="hero-cta mt-12">
          <Button size="lg" onClick={() => window.dispatchEvent(new Event("open-booking"))}>
            {hero.ctaText}
          </Button>
        </div>
      </div>
    </section>
  );
}
