import { cn } from "@/lib/utils";
import SmoothButton from "@/components/smoothui/smooth-button";
import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import { useEffect, useId, useState } from "react";

export interface ProductCardProps {
  badge?: string;
  className?: string;
  currency?: string;
  image: string;
  onAddToCart?: () => void;
  onWishlist?: () => void;
  originalPrice?: number;
  price: number;
  rating?: number;
  title: string;
}

/* ─────────────────────────────────────────────────────────
 * ANIMATION STORYBOARD
 *
 *    0ms   card enters viewport → fade up + scale
 *  250ms   badge pops in with spring
 *  hover   image zooms 1.05, wishlist heart appears
 *  click   button scale bounce + icon morph to checkmark
 * ───────────────────────────────────────────────────────── */

const SPRING = {
  bounce: 0.1,
  duration: 0.25,
  type: "spring" as const,
};

const SPRING_BOUNCY = {
  bounce: 0.2,
  duration: 0.3,
  type: "spring" as const,
};

const STAR_PATH =
  "M11.48 3.499a.562.562 0 011.04 0l2.125 5.111a.563.563 0 00.475.345l5.518.442c.499.04.701.663.321.988l-4.204 3.602a.563.563 0 00-.182.557l1.285 5.385a.562.562 0 01-.84.61l-4.725-2.885a.562.562 0 00-.586 0L6.982 20.54a.562.562 0 01-.84-.61l1.285-5.386a.562.562 0 00-.182-.557l-4.204-3.602a.562.562 0 01.321-.988l5.518-.442a.563.563 0 00.475-.345L11.48 3.5z";

function StarIcon({ filled, half }: { filled: boolean; half?: boolean }) {
  const id = useId();

  if (half) {
    const gradientId = `half-star-${id}`;
    return (
      <svg
        aria-hidden="true"
        className="h-3.5 w-3.5 text-amber-400"
        viewBox="0 0 24 24"
      >
        <defs>
          <linearGradient id={gradientId}>
            <stop offset="50%" stopColor="currentColor" />
            <stop offset="50%" stopColor="transparent" />
          </linearGradient>
        </defs>
        <path
          d={STAR_PATH}
          fill={`url(#${gradientId})`}
          stroke="currentColor"
          strokeLinecap="round"
          strokeLinejoin="round"
          strokeWidth={1.5}
        />
      </svg>
    );
  }

  return (
    <svg
      aria-hidden="true"
      className={cn(
        "h-3.5 w-3.5",
        filled ? "text-amber-400" : "text-muted-foreground/30"
      )}
      fill={filled ? "currentColor" : "none"}
      stroke="currentColor"
      strokeWidth={filled ? 0 : 1.5}
      viewBox="0 0 24 24"
    >
      <path d={STAR_PATH} strokeLinecap="round" strokeLinejoin="round" />
    </svg>
  );
}

function CheckIcon() {
  return (
    <svg
      aria-hidden="true"
      className="h-4 w-4"
      fill="none"
      stroke="currentColor"
      strokeWidth={2.5}
      viewBox="0 0 24 24"
    >
      <path d="M5 13l4 4L19 7" strokeLinecap="round" strokeLinejoin="round" />
    </svg>
  );
}

function CartIcon() {
  return (
    <svg
      aria-hidden="true"
      className="h-4 w-4"
      fill="none"
      stroke="currentColor"
      strokeWidth={2}
      viewBox="0 0 24 24"
    >
      <path
        d="M15.75 10.5V6a3.75 3.75 0 10-7.5 0v4.5m11.356-1.993l1.263 12c.07.665-.45 1.243-1.119 1.243H4.25a1.125 1.125 0 01-1.12-1.243l1.264-12A1.125 1.125 0 015.513 7.5h12.974c.576 0 1.059.435 1.119 1.007zM8.625 10.5a.375.375 0 11-.75 0 .375.375 0 01.75 0zm7.5 0a.375.375 0 11-.75 0 .375.375 0 01.75 0z"
        strokeLinecap="round"
        strokeLinejoin="round"
      />
    </svg>
  );
}

function HeartIcon({ filled }: { filled: boolean }) {
  return (
    <svg
      aria-hidden="true"
      className={cn("h-4 w-4", filled ? "text-red-500" : "text-foreground")}
      fill={filled ? "currentColor" : "none"}
      stroke="currentColor"
      strokeWidth={filled ? 0 : 2}
      viewBox="0 0 24 24"
    >
      <path
        d="M21 8.25c0-2.485-2.099-4.5-4.688-4.5-1.935 0-3.597 1.126-4.312 2.733-.715-1.607-2.377-2.733-4.313-2.733C5.1 3.75 3 5.765 3 8.25c0 7.22 9 12 9 12s9-4.78 9-12z"
        strokeLinecap="round"
        strokeLinejoin="round"
      />
    </svg>
  );
}

function RatingStars({ rating, title }: { rating: number; title: string }) {
  const fullStars = Math.floor(rating);
  const hasHalf = rating - fullStars >= 0.25 && rating - fullStars < 0.75;
  const roundedUp = rating - fullStars >= 0.75;

  return (
    <div
      aria-label={`${rating} out of 5 stars`}
      className="flex items-center gap-0.5"
    >
      {Array.from({ length: 5 }, (_, i) => {
        const isFilled = i < fullStars || (roundedUp && i === fullStars);
        const isHalf = hasHalf && i === fullStars;
        return (
          <StarIcon
            filled={isFilled}
            half={isHalf}
            key={`star-${title}-${i}`}
          />
        );
      })}
      <span className="ml-1 font-medium text-muted-foreground text-xs">
        {rating}
      </span>
    </div>
  );
}

export default function ProductCard({
  image,
  title,
  price,
  originalPrice,
  currency = "$",
  rating,
  badge,
  onAddToCart,
  onWishlist,
  className,
}: ProductCardProps) {
  const shouldReduceMotion = useReducedMotion();
  const [isHoverDevice, setIsHoverDevice] = useState(false);
  const [isAdded, setIsAdded] = useState(false);
  const [isWishlisted, setIsWishlisted] = useState(false);

  useEffect(() => {
    const mediaQuery = window.matchMedia("(hover: hover) and (pointer: fine)");
    setIsHoverDevice(mediaQuery.matches);
    const handler = (e: MediaQueryListEvent) => setIsHoverDevice(e.matches);
    mediaQuery.addEventListener("change", handler);
    return () => mediaQuery.removeEventListener("change", handler);
  }, []);

  const handleAddToCart = () => {
    setIsAdded(true);
    onAddToCart?.();
    setTimeout(() => setIsAdded(false), 2000);
  };

  const handleWishlist = () => {
    setIsWishlisted((prev) => !prev);
    onWishlist?.();
  };

  const hasDiscount = originalPrice !== undefined && originalPrice > price;
  const discountPercent = hasDiscount
    ? Math.round(((originalPrice - price) / originalPrice) * 100)
    : 0;

  return (
    <motion.div
      aria-label={`${title} - ${currency}${price}`}
      className={cn(
        "group relative flex w-full flex-col overflow-hidden rounded-2xl border bg-card shadow-sm",
        "transition-shadow duration-300",
        isHoverDevice && "hover:shadow-black/5 hover:shadow-xl",
        className
      )}
      initial={
        shouldReduceMotion
          ? { opacity: 1 }
          : { opacity: 0, transform: "translateY(20px) scale(0.97)" }
      }
      role="article"
      transition={shouldReduceMotion ? { duration: 0 } : SPRING}
      viewport={{ margin: "-50px", once: true }}
      whileInView={
        shouldReduceMotion
          ? { opacity: 1 }
          : { opacity: 1, transform: "translateY(0px) scale(1)" }
      }
    >
      {/* Image — full bleed */}
      <div className="relative aspect-square overflow-hidden bg-muted">
        <img
          alt={title}
          className={cn(
            "h-full w-full object-cover",
            !shouldReduceMotion &&
              "transition-transform duration-500 ease-[cubic-bezier(0.23,1,0.32,1)]",
            isHoverDevice && !shouldReduceMotion && "group-hover:scale-105"
          )}
          draggable={false}
          src={image}
        />

        {/* Hover overlay gradient */}
        <div
          className={cn(
            "pointer-events-none absolute inset-0 bg-gradient-to-t from-black/10 via-transparent to-transparent opacity-0 transition-opacity duration-300",
            isHoverDevice && "group-hover:opacity-100"
          )}
        />

        {/* Badge */}
        {badge ? (
          <motion.span
            animate={
              shouldReduceMotion
                ? { opacity: 1 }
                : { opacity: 1, transform: "scale(1)" }
            }
            className={cn(
              "absolute top-3 left-3 rounded-full px-2.5 py-1 font-semibold text-xs shadow-sm",
              badge.toLowerCase() === "sale"
                ? "bg-red-500 text-white"
                : badge.toLowerCase() === "new"
                  ? "bg-emerald-500 text-white"
                  : "bg-primary text-primary-foreground"
            )}
            initial={
              shouldReduceMotion
                ? { opacity: 1 }
                : { opacity: 0, transform: "scale(0.6)" }
            }
            role="status"
            transition={shouldReduceMotion ? { duration: 0 } : SPRING_BOUNCY}
          >
            {badge}
          </motion.span>
        ) : null}

        {/* Wishlist button */}
        <motion.button
          aria-label={
            isWishlisted
              ? `Remove ${title} from wishlist`
              : `Add ${title} to wishlist`
          }
          className={cn(
            "absolute top-3 right-3 flex h-8 w-8 cursor-pointer items-center justify-center rounded-full bg-background/80 backdrop-blur-sm",
            "transition-colors duration-150",
            "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring",
            isHoverDevice ? "opacity-0 group-hover:opacity-100" : "opacity-100"
          )}
          onClick={handleWishlist}
          type="button"
          whileTap={
            shouldReduceMotion
              ? undefined
              : { scale: 0.85, transition: { duration: 0.1 } }
          }
        >
          <HeartIcon filled={isWishlisted} />
        </motion.button>
      </div>

      {/* Content */}
      <div className="flex flex-1 flex-col gap-2 p-4">
        <h3 className="line-clamp-1 font-semibold text-foreground text-sm tracking-tight">
          {title}
        </h3>

        {rating !== undefined && <RatingStars rating={rating} title={title} />}

        <div className="flex items-baseline gap-2">
          <span className="font-bold text-foreground text-xl tracking-tight">
            {currency}
            {price}
          </span>
          {hasDiscount ? (
            <>
              <span className="text-muted-foreground text-sm line-through">
                {currency}
                {originalPrice}
              </span>
              <span className="rounded-md bg-red-50 px-1.5 py-0.5 font-semibold text-red-600 text-xs dark:bg-red-950/40 dark:text-red-400">
                -{discountPercent}%
              </span>
            </>
          ) : null}
        </div>

        <div className="mt-auto pt-2">
          <SmoothButton
            aria-label={`Add ${title} to cart`}
            className={cn(
              "w-full gap-2",
              isAdded && "bg-emerald-600 text-white hover:bg-emerald-600"
            )}
            disabled={isAdded}
            onClick={handleAddToCart}
            size="default"
            variant="candy"
          >
            <AnimatePresence initial={false} mode="wait">
              {isAdded ? (
                <motion.span
                  animate={{ opacity: 1, transform: "scale(1)" }}
                  className="flex items-center gap-2"
                  exit={{ opacity: 0, transform: "scale(0.8)" }}
                  initial={{ opacity: 0, transform: "scale(0.8)" }}
                  key="added"
                  transition={
                    shouldReduceMotion ? { duration: 0 } : { duration: 0.15 }
                  }
                >
                  <CheckIcon /> Added
                </motion.span>
              ) : (
                <motion.span
                  animate={{ opacity: 1, transform: "scale(1)" }}
                  className="flex items-center gap-2"
                  exit={{ opacity: 0, transform: "scale(0.8)" }}
                  initial={{ opacity: 0, transform: "scale(0.8)" }}
                  key="cart"
                  transition={
                    shouldReduceMotion ? { duration: 0 } : { duration: 0.15 }
                  }
                >
                  <CartIcon /> Add to Cart
                </motion.span>
              )}
            </AnimatePresence>
          </SmoothButton>
        </div>
      </div>
    </motion.div>
  );
}
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