"use client";

import { useCallback, useState, useEffect, useRef } from "react";
import { motion, AnimatePresence } from "framer-motion";
import { Star, MapPin, Clock, ExternalLink, Flame, Bookmark, ChevronLeft, ChevronRight } from "lucide-react";
import { Restaurant } from "@/types";
import { getUserId, isRegistered } from "@/lib/userId";
import RestaurantImage from "@/components/RestaurantImage";

interface RestaurantCardProps {
  restaurant: Restaurant;
  likeCount?: number;
}

function stopAll(e: React.SyntheticEvent) {
  e.stopPropagation();
}

function ImageGallery({ images, name }: { images: string[]; name: string }) {
  const [idx, setIdx] = useState(0);
  const [fadingOut, setFadingOut] = useState<number | null>(null);
  const [showHint, setShowHint] = useState(true);
  const count = images.length;
  const hasMultiple = count > 1;

  useEffect(() => {
    if (!hasMultiple || !showHint) return;
    const t = setTimeout(() => setShowHint(false), 2500);
    return () => clearTimeout(t);
  }, [hasMultiple, showHint]);

  const goTo = useCallback(
    (newIdx: number) => {
      if (newIdx === idx) return;
      setFadingOut(idx);
      setIdx(newIdx);
    },
    [idx],
  );

  const handleTap = useCallback(
    (e: React.MouseEvent) => {
      if (!hasMultiple) return;
      e.stopPropagation();
      e.preventDefault();
      setShowHint(false);

      const rect = e.currentTarget.getBoundingClientRect();
      const tapX = e.clientX - rect.left;
      const isRight = tapX > rect.width / 2;

      const newIdx = isRight
        ? Math.min(idx + 1, count - 1)
        : Math.max(idx - 1, 0);
      goTo(newIdx);
    },
    [hasMultiple, count, idx, goTo],
  );

  return (
    <div className="relative h-full w-full" onClick={handleTap} onPointerDown={stopAll}>
      <RestaurantImage
        src={images[idx]}
        alt={name}
        className="absolute inset-0 h-full w-full object-cover"
        draggable={false}
      />

      {fadingOut !== null && (
        <RestaurantImage
          key={fadingOut}
          src={images[fadingOut]}
          alt=""
          className="absolute inset-0 h-full w-full object-cover"
          style={{ animation: "img-fade-out 280ms ease-out forwards" }}
          onAnimationEnd={() => setFadingOut(null)}
          draggable={false}
        />
      )}

      {hasMultiple && (
        <>
          <div className="absolute left-0 right-0 top-2 flex justify-center gap-1">
            {images.map((_, i) => (
              <span
                key={i}
                className={`h-[3px] rounded-full transition-all duration-200 ${
                  i === idx
                    ? "w-4 bg-white"
                    : "w-1.5 bg-white/40"
                }`}
              />
            ))}
          </div>

          {idx > 0 && (
            <div className="pointer-events-none absolute left-2 top-1/2 -translate-y-1/2 rounded-full bg-black/25 p-1 backdrop-blur-sm">
              <ChevronLeft size={20} className="text-white/90" />
            </div>
          )}
          {idx < count - 1 && (
            <div className="pointer-events-none absolute right-2 top-1/2 -translate-y-1/2 rounded-full bg-black/25 p-1 backdrop-blur-sm">
              <ChevronRight size={20} className="text-white/90" />
            </div>
          )}

          {showHint && idx === 0 && (
            <div className="pointer-events-none absolute inset-x-0 top-1/2 -translate-y-1/2 animate-pulse text-center">
              <span className="rounded-full bg-black/40 px-3 py-1 text-[11px] font-medium text-white/90 backdrop-blur-sm">
                点击图片左右切换 · 共 {count} 张
              </span>
            </div>
          )}
        </>
      )}
    </div>
  );
}

export default function RestaurantCard({ restaurant, likeCount = 0 }: RestaurantCardProps) {
  const [favorited, setFavorited] = useState(false);
  const [likeBounce, setLikeBounce] = useState(false);
  const prevLikeRef = useRef(likeCount);

  useEffect(() => {
    if (likeCount > prevLikeRef.current) {
      setLikeBounce(true);
      const t = setTimeout(() => setLikeBounce(false), 600);
      return () => clearTimeout(t);
    }
    prevLikeRef.current = likeCount;
  }, [likeCount]);

  const images = restaurant.images?.filter(Boolean);
  const hasImage = images && images.length > 0;

  const handleFavorite = useCallback(async (e: React.MouseEvent | React.TouchEvent) => {
    e.stopPropagation();
    e.preventDefault();
    if (favorited) return;

    try {
      const res = await fetch("/api/user/favorite", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ userId: getUserId(), restaurant }),
      });
      if (res.ok) setFavorited(true);
    } catch {}
  }, [restaurant, favorited]);
  const openLink = useCallback(
    (url: string) => (e: React.MouseEvent | React.TouchEvent) => {
      e.stopPropagation();
      e.preventDefault();
      window.open(url, "_blank", "noopener,noreferrer");
    },
    [],
  );

  const amapUrl = `https://uri.amap.com/poidetail?poiid=${restaurant.id}`;
  const dianpingUrl = `https://m.dianping.com/search/keyword/0/0_${encodeURIComponent(restaurant.name)}`;

  return (
    <div className="flex h-full w-full flex-col overflow-hidden rounded-2xl bg-surface shadow-xl ring-1 ring-border">
      <div className="relative h-[58%] w-full shrink-0 overflow-hidden bg-elevated">
        {hasImage && <ImageGallery images={images} name={restaurant.name} />}
        <div className="pointer-events-none absolute inset-0 bg-linear-to-t from-black/40 via-transparent to-transparent" />

        <div className="absolute bottom-3 left-4 flex items-center gap-1.5">
          {restaurant.category && (
            <span className="rounded-full bg-white/80 px-2.5 py-0.5 text-xs font-semibold text-gray-800 shadow-sm backdrop-blur-sm">
              {restaurant.category}
            </span>
          )}
          <AnimatePresence>
            {likeCount > 0 && (
              <motion.span
                key="like-badge"
                className="flex items-center gap-0.5 rounded-full bg-rose-500/90 px-2 py-0.5 text-xs font-semibold text-white shadow-sm backdrop-blur-sm"
                initial={{ opacity: 0, scale: 0.5, x: -8 }}
                animate={{
                  opacity: 1,
                  scale: likeBounce ? [1, 1.3, 1] : 1,
                  x: 0,
                }}
                exit={{ opacity: 0, scale: 0.5 }}
                transition={likeBounce
                  ? { scale: { duration: 0.4, ease: "easeInOut" }, default: { type: "spring", stiffness: 400, damping: 20 } }
                  : { type: "spring", stiffness: 400, damping: 20 }
                }
              >
                <Flame size={11} className={likeBounce ? "animate-pulse" : ""} />
                {likeCount} 人想去
              </motion.span>
            )}
          </AnimatePresence>
        </div>
      </div>

      <div className="flex flex-1 flex-col justify-center gap-2 px-5 py-3">
        <div className="flex items-start justify-between gap-2">
          <h2 className="text-lg font-bold leading-tight text-heading">
            {restaurant.name}
          </h2>
          <div className="mt-0.5 flex shrink-0 gap-1.5">
            {isRegistered() && (
              <button
                onClick={handleFavorite}
                onPointerDown={stopAll}
                onTouchStart={stopAll}
                className={`flex items-center justify-center rounded-full p-1 transition-colors ${
                  favorited
                    ? "bg-amber-500/20 text-amber-400"
                    : "bg-elevated text-muted active:bg-amber-500/15 active:text-amber-400"
                }`}
              >
                <Bookmark size={13} className={favorited ? "fill-amber-400" : ""} />
              </button>
            )}
            <button
              onClick={openLink(amapUrl)}
              onPointerDown={stopAll}
              onTouchStart={stopAll}
              className="flex items-center gap-0.5 rounded-full bg-blue-500/15 px-2 py-0.5 text-[11px] font-medium text-blue-400 transition-colors active:bg-blue-500/25"
            >
              高德
              <ExternalLink size={10} />
            </button>
            <button
              onClick={openLink(dianpingUrl)}
              onPointerDown={stopAll}
              onTouchStart={stopAll}
              className="flex items-center gap-0.5 rounded-full bg-orange-500/15 px-2 py-0.5 text-[11px] font-medium text-orange-400 transition-colors active:bg-orange-500/25"
            >
              点评
              <ExternalLink size={10} />
            </button>
          </div>
        </div>

        <div className="flex flex-wrap items-center gap-x-3 gap-y-1">
          <div className="flex items-center gap-1">
            <Star size={14} className="fill-amber-400 text-amber-400" />
            <span className="text-sm font-semibold text-foreground">
              {restaurant.rating}
            </span>
          </div>

          <span className="text-sm font-semibold text-emerald-400">
            {restaurant.price}
          </span>

          {restaurant.distance && (
            <div className="flex items-center gap-1 text-muted">
              <MapPin size={13} />
              <span className="text-xs">{restaurant.distance}</span>
            </div>
          )}
        </div>

        {restaurant.address && (
          <p className="truncate text-xs leading-tight text-muted">
            {restaurant.address}
          </p>
        )}

        {restaurant.openTime && (
          <div className="flex items-center gap-1 text-xs text-muted">
            <Clock size={12} />
            <span>{restaurant.openTime}</span>
          </div>
        )}

        {restaurant.tag && (
          <div className="flex gap-1.5 overflow-hidden">
            {restaurant.tag
              .split(",")
              .slice(0, 3)
              .map((t) => (
                <span
                  key={t}
                  className="shrink-0 rounded bg-amber-500/10 px-1.5 py-0.5 text-[10px] font-medium text-amber-400"
                >
                  {t.trim()}
                </span>
              ))}
          </div>
        )}
      </div>
    </div>
  );
}