"use client";

import React, { useEffect, useRef, useState } from "react";
import {
  motion,
  useAnimationFrame,
  useMotionTemplate,
  useMotionValue,
  useTransform,
  animate,
} from "motion/react";
import { cn } from "@/lib/utils";
import { ChevronLeft, ChevronRight } from "lucide-react";
import { Button } from "@/components/ui/button";

export function AppleCardsCarousel({
  items,
  direction = "left",
  speed = "fast",
  pauseOnHover = true,
  className,
}: {
  items: {
    title: string;
    description: string;
    icon: React.ReactNode;
    src?: string;
  }[];
  direction?: "left" | "right";
  speed?: "fast" | "normal" | "slow";
  pauseOnHover?: boolean;
  className?: string;
}) {
  const containerRef = useRef<HTMLDivElement>(null);
  const scrollRef = useRef<HTMLDivElement>(null);

  const [start, setStart] = useState(false);
  useEffect(() => {
    setStart(true);
  }, []);

  const baseVelocity = {
    fast: 50,
    normal: 35,
    slow: 20,
  };

  const baseX = useMotionValue(0);
  const directionFactor = React.useRef<number>(1);
  const [hovered, setHovered] = useState(false);
  
  useAnimationFrame((t, delta) => {
    if (hovered) return;
    
    let moveBy = directionFactor.current * baseVelocity[speed] * (delta / 1000);

    if (direction === "left") {
      directionFactor.current = -1;
    } else {
      directionFactor.current = 1;
    }

    moveBy += directionFactor.current * moveBy * 0.5;

    baseX.set(baseX.get() + moveBy);
  });

  const scrollLeft = () => {
    if (scrollRef.current) {
      // Calculate responsive card width + gap
      const cardWidth = window.innerWidth < 640 ? 280 : window.innerWidth < 768 ? 320 : 350;
      const scrollAmount = cardWidth + 16; // card width + gap
      const newX = baseX.get() + scrollAmount;
      animate(baseX, newX, { duration: 0.5, ease: "easeOut" });
    }
  };

  const scrollRight = () => {
    if (scrollRef.current) {
      // Calculate responsive card width + gap
      const cardWidth = window.innerWidth < 640 ? 280 : window.innerWidth < 768 ? 320 : 350;
      const scrollAmount = cardWidth + 16; // card width + gap
      const newX = baseX.get() - scrollAmount;
      animate(baseX, newX, { duration: 0.5, ease: "easeOut" });
    }
  };

  return (
    <div className="space-y-6">
      <div
        ref={containerRef}
        className={cn(
          "relative w-full overflow-hidden [mask-image:linear-gradient(to_right,transparent_0%,white_10%,white_90%,transparent_100%)]",
          className
        )}
        onMouseEnter={() => pauseOnHover && setHovered(true)}
        onMouseLeave={() => pauseOnHover && setHovered(false)}
      >
        <div className="flex justify-center">
          <motion.div
            ref={scrollRef}
            style={{
              x: baseX,
              willChange: "transform",
            }}
            className="flex flex-nowrap gap-4 items-center"
          >
        {start &&
          items.map((item, idx) => (
            <div
              key={`item-${idx}`}
              className="relative shrink-0 w-[280px] sm:w-[320px] md:w-[350px]"
            >
              <div className="group relative h-[400px] sm:h-[420px] md:h-[450px] w-full overflow-hidden rounded-3xl p-6 sm:p-7 md:p-8">
                {item.src && (
                  <div className="absolute inset-0">
                    <img
                      src={item.src}
                      alt={item.title}
                      className="h-full w-full object-cover"
                    />
                    <div className="absolute inset-0 bg-gradient-to-br from-black/60 via-black/40 to-black/60" />
                  </div>
                )}
                <div className="absolute inset-0 bg-[linear-gradient(to_bottom_right,var(--background)_0%,rgba(255,255,255,0.08)_50%,transparent_60%)] opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
                <div className="relative z-10">
                  <div className="mb-4 flex items-center gap-4">
                    {item.icon}
                    <div>
                      <h3 className="text-heading-3 font-semibold text-overlay-foreground">
                        {item.title}
                      </h3>
                    </div>
                  </div>
                  <p className="text-body-sm text-overlay-foreground/90">
                    {item.description}
                  </p>
                </div>
              </div>
            </div>
          ))}
        {start &&
          items.map((item, idx) => (
            <div
              key={`item-duplicate-${idx}`}
              className="relative shrink-0 w-[280px] sm:w-[320px] md:w-[350px]"
            >
              <div className="group relative h-[400px] sm:h-[420px] md:h-[450px] w-full overflow-hidden rounded-3xl p-6 sm:p-7 md:p-8">
                {item.src && (
                  <div className="absolute inset-0">
                    <img
                      src={item.src}
                      alt={item.title}
                      className="h-full w-full object-cover"
                    />
                    <div className="absolute inset-0 bg-gradient-to-br from-black/60 via-black/40 to-black/60" />
                  </div>
                )}
                <div className="absolute inset-0 bg-[linear-gradient(to_bottom_right,var(--background)_0%,rgba(255,255,255,0.08)_50%,transparent_60%)] opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
                <div className="relative z-10">
                  <div className="mb-4 flex items-center gap-4">
                    {item.icon}
                    <div>
                      <h3 className="text-heading-3 font-semibold text-overlay-foreground">
                        {item.title}
                      </h3>
                    </div>
                  </div>
                  <p className="text-body-sm text-overlay-foreground/90">
                    {item.description}
                  </p>
                </div>
              </div>
            </div>
          ))}
          </motion.div>
        </div>
      </div>
      <div className="flex justify-center gap-4">
        <Button
          variant="outline"
          size="icon-lg"
          onClick={scrollRight}
          aria-label="Scroll left"
        >
          <ChevronRight className="h-5 w-5" />
        </Button>
        <Button
          variant="outline"
          size="icon-lg"
          onClick={scrollLeft}
          aria-label="Scroll right"
        >
          <ChevronLeft className="h-5 w-5" />
        </Button>
      </div>
    </div>
  );
}