"use client";

import Image from "next/image";
import { useCallback, useEffect, useMemo, useState } from "react";
import HoverFillButton from "./HoverFillButton";

export type HeroSlideData = {
  id: string;
  image: string;
  imagePosition?: string;
  title: string;
  subtitle: string;
  cta: { label: string; href: string };
};

const FALLBACK_SLIDES: HeroSlideData[] = [
  {
    id: "autumn",
    image: "/images/home/banners/hero.jpg",
    imagePosition: "object-[center_top]",
    title: "برای بانویی که خودش انتخاب میکند.",
    subtitle: "made for her",
    cta: { label: "کالکشن پاییزه", href: "/products?collection=autumn" },
  },
  {
    id: "new",
    image: "/images/home/banners/hero.jpg",
    imagePosition: "object-[center_top]",
    title: "جدیدترین‌های فصل همین حالا ببینید.",
    subtitle: "new arrivals",
    cta: { label: "جدیدترین‌ها", href: "/products?sort=newest" },
  },
  {
    id: "sale",
    image: "/images/home/banners/hero.jpg",
    imagePosition: "object-[center_top]",
    title: "فروش ویژه تا ۷۰٪ تخفیف",
    subtitle: "up to 70% off",
    cta: { label: "مشاهده تخفیف‌ها", href: "/products?sale=1" },
  },
];

const AUTO_MS = 10000;

type HeroSliderProps = {
  slides?: HeroSlideData[];
};

export default function HeroSlider({ slides }: HeroSliderProps) {
  const list = useMemo(
    () => (slides?.length ? slides : FALLBACK_SLIDES),
    [slides],
  );
  const [index, setIndex] = useState(0);
  const [textKey, setTextKey] = useState(0);
  const [paused, setPaused] = useState(false);
  const slide = list[index] ?? list[0];

  useEffect(() => {
    setIndex(0);
  }, [list]);

  const goTo = useCallback((next: number) => {
    setIndex(next);
    setTextKey((k) => k + 1);
  }, []);

  const goPrev = () => goTo((index - 1 + list.length) % list.length);
  const goNext = () => goTo((index + 1) % list.length);

  useEffect(() => {
    if (paused || list.length <= 1) return;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (reduce) return;
    const t = window.setInterval(() => {
      setIndex((i) => (i + 1) % list.length);
      setTextKey((k) => k + 1);
    }, AUTO_MS);
    return () => window.clearInterval(t);
  }, [index, paused, list.length]);

  if (!slide) return null;

  return (
    <section
      className="relative h-[calc(100dvh-7.5rem)] min-h-[480px] w-full overflow-hidden bg-[#ebe6df] sm:h-[calc(100dvh-8.25rem)]"
      onMouseEnter={() => setPaused(true)}
      onMouseLeave={() => setPaused(false)}
    >
      {list.map((s, i) => {
        const active = i === index;
        return (
          <div
            key={s.id}
            className={`absolute inset-0 transition-opacity duration-1000 ease-out ${
              active ? "opacity-100" : "opacity-0"
            }`}
            aria-hidden={!active}
          >
            <Image
              key={active ? `on-${s.id}-${index}` : `off-${s.id}`}
              src={s.image}
              alt=""
              fill
              priority={i === 0}
              sizes="100vw"
              className={`object-cover ${s.imagePosition ?? "object-center"} ${
                active ? "hero-ken-burns" : ""
              } ${active && paused ? "hero-ken-burns-paused" : ""}`}
            />
          </div>
        );
      })}

      <div className="absolute inset-0 bg-gradient-to-l from-white/25 via-transparent to-transparent" />

      <div className="absolute inset-y-0 right-16 z-10 flex w-[min(360px,calc(100%-6.5rem))] items-center sm:right-24 lg:right-[200px]">
        <div
          key={textKey}
          dir="rtl"
          className="hero-copy-in w-full pt-16 text-right"
        >
          <h1 className="hero-copy-item whitespace-pre-line font-doran text-right text-[clamp(1.25rem,2.2vw,2.25rem)] font-medium leading-[1.4] text-ink">
            {slide.title}
          </h1>
          {slide.subtitle ? (
            <p
              dir="ltr"
              className="hero-copy-item hero-copy-item-2 mt-3 block w-full whitespace-pre-line text-right font-montserrat text-[clamp(0.875rem,1.4vw,1.35rem)] font-light uppercase tracking-[0.28em] text-[#6d6d6d]"
            >
              {slide.subtitle}
            </p>
          ) : null}
          {slide.cta.label ? (
            <div className="hero-copy-item hero-copy-item-3">
              <HoverFillButton href={slide.cta.href || "#"} className="mt-7 w-full">
                {slide.cta.label}
              </HoverFillButton>
            </div>
          ) : null}
        </div>
      </div>

      {list.length > 1 ? (
        <>
          <div className="pointer-events-none absolute inset-y-0 left-4 z-20 flex items-center sm:left-8 lg:left-[120px]">
            <button
              type="button"
              aria-label="اسلاید قبلی"
              onClick={goPrev}
              className="pointer-events-auto flex size-10 items-center justify-center rounded-[4px] bg-white/20 backdrop-blur-sm transition hover:bg-white/40 sm:size-12"
            >
              <Image
                src="/images/home/icons/caret-left-dark.svg"
                alt=""
                width={22}
                height={22}
                unoptimized
              />
            </button>
          </div>
          <div className="pointer-events-none absolute inset-y-0 right-4 z-20 flex items-center sm:right-8 lg:right-[120px]">
            <button
              type="button"
              aria-label="اسلاید بعدی"
              onClick={goNext}
              className="pointer-events-auto flex size-10 items-center justify-center rounded-[4px] bg-white/20 backdrop-blur-sm transition hover:bg-white/40 sm:size-12"
            >
              <Image
                src="/images/home/icons/caret-right.svg"
                alt=""
                width={22}
                height={22}
                unoptimized
              />
            </button>
          </div>

          <div
            dir="ltr"
            className="absolute inset-x-0 bottom-8 z-20 flex items-center justify-center gap-2.5 sm:bottom-12"
            role="tablist"
            aria-label="اسلایدهای هیرو"
          >
            {list.map((s, i) => {
              const active = i === index;
              return (
                <button
                  key={s.id}
                  type="button"
                  role="tab"
                  aria-selected={active}
                  aria-label={`اسلاید ${i + 1}`}
                  onClick={() => goTo(i)}
                  className={`h-2 rounded-full transition-all duration-300 ${
                    active
                      ? "w-8 bg-ink"
                      : "w-2 bg-ink/30 hover:bg-ink/50"
                  }`}
                />
              );
            })}
          </div>
        </>
      ) : null}
    </section>
  );
}