"use client";

import { ChevronUp } from "lucide-react";
import React, { useState, useEffect } from "react";
import Link from "next/link";

import { cn } from "@/lib/utils";
import { useContent } from "@/components/layout/content-provider";

import type { CarouselApi } from "@/components/ui/carousel";
import {
  Carousel,
  CarouselContent,
  CarouselItem,
  CarouselNext,
  CarouselPrevious,
} from "@/components/ui/carousel";

const MOBILE_BREAKPOINT = 768;
const AUTOPLAY_DELAY_MS = 3200;

const FeatureCarousel = () => {
  const content = useContent();
  const { featureCarousel } = content.pages.home;
  const carouselItems = featureCarousel.items;

  const [openCardIndex, setOpenCardIndex] = useState<number | null>(null);
  const [isMobile, setIsMobile] = useState(false);
  const [carouselApi, setCarouselApi] = useState<CarouselApi | null>(null);

  useEffect(() => {
    const mq = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`);
    const handler = () => setIsMobile(mq.matches);
    handler();
    mq.addEventListener("change", handler);
    return () => mq.removeEventListener("change", handler);
  }, []);

  useEffect(() => {
    if (!isMobile || !carouselApi) return;
    const timer = setInterval(() => {
      carouselApi.scrollNext();
    }, AUTOPLAY_DELAY_MS);
    return () => clearInterval(timer);
  }, [isMobile, carouselApi]);

  const handleCardClick = (index: number) => {
    if (!isMobile) return;
    setOpenCardIndex((prev) => (prev === index ? null : index));
  };

  return (
    <section id="rahavarha" className="py-32">
      <div className="relative container mx-auto max-w-7xl px-6">
        <h2 className="text-heading-2 z-10 mb-10 text-center font-semibold tracking-tight text-foreground">
          {featureCarousel.heading}
        </h2>

        <Carousel
          opts={{
            align: "center",
            loop: true,
            duration: 20,
          }}
          setApi={setCarouselApi}
          className="w-full"
          dir="ltr"
        >
          <CarouselContent className="py-5">
            {carouselItems.map((item, index) => (
              <CarouselItem
                key={index}
                className="text-background select-none md:basis-1/2 lg:basis-1/3 dark:text-foreground"
              >
                <DottedDiv className="group h-150 w-full mx-auto p-4">
                  <div
                    className={cn(
                      "group/card relative h-full w-full bg-muted/50 p-4 transition-colors duration-300 ease-out group-hover:bg-muted",
                      isMobile && "cursor-pointer"
                    )}
                    data-open={openCardIndex === index}
                    onClick={() => handleCardClick(index)}
                    role={isMobile ? "button" : undefined}
                    aria-expanded={isMobile ? openCardIndex === index : undefined}
                  >
                    <div className="relative h-full w-full overflow-hidden rounded-3xl">
                      <img
                        src={item.imageSrc}
                        alt={item.title}
                        className="h-full w-full object-cover transition-transform duration-500 ease-out group-hover:scale-105 group-active:scale-105 md:group-hover:scale-105 md:group-active:scale-105"
                      />
                      {/* Overlay: hover on desktop, open state on mobile */}
                      <div
                        className={cn(
                          "absolute inset-0 bg-black/0 backdrop-blur-none transition-all duration-300 ease-out",
                          "md:group-hover:bg-black/50 md:group-hover:backdrop-blur-md md:group-active:bg-black/50 md:group-active:backdrop-blur-md",
                          "max-md:group-data-[open=true]/card:bg-black/50 max-md:group-data-[open=true]/card:backdrop-blur-md"
                        )}
                        aria-hidden
                      />

                      {/* Text overlay */}
                      <div
                        className={cn(
                          "absolute inset-4 -ml-4 flex flex-col items-center justify-between p-6 sm:p-8 opacity-0 translate-y-4 transition-all duration-300 ease-out",
                          "md:group-hover:opacity-100 md:group-hover:translate-y-0 md:group-active:opacity-100 md:group-active:translate-y-0",
                          "max-md:group-data-[open=true]/card:opacity-100 max-md:group-data-[open=true]/card:translate-y-0"
                        )}
                      >
                        <div className="flex flex-1 flex-col items-center justify-center pointer-events-none">
                          <h3 className="text-heading-3 text-center font-semibold tracking-tight text-background dark:text-foreground">
                            {item.title}
                          </h3>
                          <div className="mx-auto mt-2 h-1 w-6 rounded-full bg-background/90 dark:bg-foreground/90" />
                          <p className="text-body-sm mt-6 max-w-sm px-1 text-center leading-relaxed tracking-tight text-background/90 dark:text-foreground/90">
                            {item.description}
                          </p>
                        </div>
                        <Link
                          href={item.link}
                          onClick={(e) => e.stopPropagation()}
                          className="pointer-events-auto group/cta mb-2 flex cursor-pointer flex-col items-center justify-center transition-transform duration-300 ease-out group-hover/cta:-translate-y-1"
                        >
                          <ChevronUp
                            size={28}
                            className="text-background dark:text-foreground"
                          />
                          <p className="text-body mt-1 font-medium tracking-tight text-background dark:text-foreground">
                            {featureCarousel.viewDetails}
                          </p>
                        </Link>
                      </div>
                    </div>
                  </div>
                </DottedDiv>
              </CarouselItem>
            ))}
          </CarouselContent>

          <div className="mt-5 flex justify-end gap-3">
            <CarouselPrevious className="static size-12" />
            <CarouselNext variant="default" className="static size-12" />
          </div>
        </Carousel>
      </div>
    </section>
  );
};

export { FeatureCarousel };

const DottedDiv = ({
  children,
  className,
}: {
  children: React.ReactNode;
  className?: string;
}) => (
  <div className={cn("relative", className)}>
    <div className="absolute top-4 -left-[28px] h-[1.5px] w-[100%] bg-muted" />
    <div className="absolute bottom-4 -left-[28px] h-[1.5px] w-[100%] bg-muted" />
    <div className="absolute -top-25 left-4 h-[130%] w-[1.5px] bg-muted" />
    <div className="absolute -top-25 right-4 h-[130%] w-[1.5px] bg-muted" />
    <div className="absolute top-[12.5px] left-[12.5px] z-10 size-2 rounded-full bg-foreground" />
    <div className="absolute top-[12.5px] right-[12.5px] z-10 size-2 rounded-full bg-foreground" />
    <div className="absolute bottom-[12.5px] left-[12.5px] z-10 size-2 rounded-full bg-foreground" />
    <div className="absolute right-[12.5px] bottom-[12.5px] z-10 size-2 rounded-full bg-foreground" />
    {children}
  </div>
);