"use client";

import { useParams } from "next/navigation";
import { useEffect, useState } from "react";
import Image from "next/image";
import { useRouter } from "next/navigation";
import toast from "react-hot-toast";
import AddToCartModal from "@/components/AddToCartModal";
import Link from "next/link";
import { AiOutlineHome, AiOutlineShoppingCart } from "react-icons/ai";
import { FiUser } from "react-icons/fi";

export default function ProductDetail() {
  const params = useParams();
  const [product, setProduct] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [quantity, setQuantity] = useState(1);
  const router = useRouter();
  const [showModal, setShowModal] = useState(false);
  const [recommendedProducts, setRecommendedProducts] = useState([]);

  useEffect(() => {
    const fetchProduct = async () => {
      try {
        const res = await fetch(`/api/products/${params.id}`);
        if (!res.ok) {
          throw new Error("获取商品详情失败");
        }
        const data = await res.json();
        setProduct(data);
        fetchRecommendedProducts(); // 直接获取推荐商品
      } catch (err) {
        setError(err.message);
      } finally {
        setLoading(false);
      }
    };

    const fetchRecommendedProducts = async () => {
      try {
        const res = await fetch(`/api/products`); // 获取所有商品
        if (!res.ok) {
          throw new Error("获取推荐商品失败");
        }
        const data = await res.json();
        setRecommendedProducts(data.slice(0, 4)); // 取前四个商品
      } catch (err) {
        console.error(err.message);
      }
    };

    fetchProduct();
  }, [params.id]);

  const handleAddToCart = async () => {
    try {
      const token = localStorage.getItem("token");
      if (!token) {
        router.push("/login");
        return;
      }

      const res = await fetch("/api/cart", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Authorization: `Bearer ${token}`,
        },
        body: JSON.stringify({
          productId: params.id,
          quantity: quantity,
        }),
      });

      if (!res.ok) {
        throw new Error("添加购物车失败");
      }

      toast.success("添加成功");
      handleModalClose();
    } catch (error) {
      toast.error(error.message);
    }
  };

  const handleBuyNow = () => {
    const token = localStorage.getItem("token");
    if (!token) {
      router.push("/login");
      return;
    }

    router.push(`/checkout?products=${params.id}&quantity=${quantity}`);
  };

  const handleAddToCartClick = () => {
    const token = localStorage.getItem("token");
    if (!token) {
      router.push("/login");
      return;
    }
    setShowModal(true);
  };

  const handleModalClose = () => {
    setShowModal(false);
  };

  if (loading) {
    return <div className="p-4">加载中...</div>;
  }

  if (error) {
    return <div className="p-4 text-red-500">错误: {error}</div>;
  }

  if (!product) {
    return <div className="p-4">商品不存在</div>;
  }

  return (
    <div className="flex flex-col min-h-screen pb-20 bg-gray-50">
      {/* 商品图片 */}
      <div className="relative aspect-square">
        <Image
          src={product.imageUrl}
          alt={product.title}
          fill
          className="object-cover"
        />
      </div>

      {/* 商品信息 */}
      <div className="flex-1 p-4 bg-white">
        <div className="flex items-center">
          <span className="text-2xl text-red-500 font-bold">
            ¥{product.price}
          </span>
          {product.isVip && (
            <span className="ml-2 px-2 py-0.5 text-xs text-yellow-600 border border-yellow-600 rounded">
              VIP
            </span>
          )}
        </div>

        <h1 className="mt-2 text-lg font-medium">{product.title}</h1>

        <div className="mt-2 text-sm text-gray-500">
          <span>库存: {product.stock}件</span>
          <span className="ml-4">销量: {product.sales}件</span>
        </div>

        {/* 配送信息 */}
        <div className="mt-4 p-3 bg-gray-50 rounded-lg">
          <div className="flex justify-between items-center">
            <span className="text-gray-500">配送</span>
            <span>{product.delivery}</span>
          </div>
          <div className="mt-2 flex justify-between items-center">
            <span className="text-gray-500">服务</span>
            <div className="flex gap-2">
              {product.services.map((service, index) => (
                <span key={index} className="text-sm text-gray-600">
                  {service}
                </span>
              ))}
            </div>
          </div>
        </div>

        {/* 商品描述 */}
        <div className="mt-6">
          <h2 className="text-lg font-bold mb-2">商品详情</h2>
          <p className="text-gray-600">{product.description}</p>

          <h3 className="mt-4 font-bold">产品特点：</h3>
          <ul className="mt-2 space-y-2">
            {product.features.map((feature, index) => (
              <li key={index} className="flex items-center text-gray-600">
                <span className="mr-2">•</span>
                {feature}
              </li>
            ))}
          </ul>
        </div>
      </div>

      {/* 推荐商品模块 */}
      <div className="p-4 bg-white mt-4">
        <h2 className="text-lg font-bold mb-2">猜你喜欢</h2>
        <div className="grid grid-cols-2 gap-4">
          {recommendedProducts.map((item) => (
            <Link key={item._id} href={`/good/${item._id}`}>
              <div className="bg-gray-100 rounded-lg p-2 overflow-hidden">
                <Image
                  src={item.imageUrl}
                  alt={item.title}
                  width={200}
                  height={200}
                  className="object-cover rounded h-32 w-full"
                />
                <h3 className="text-sm font-medium mt-2">{item.title}</h3>
                <p className="text-red-500">¥{item.price}</p>
              </div>
            </Link>
          ))}
        </div>
      </div>

      {/* 底部购买栏 */}
      <div className="fixed gap-4 bottom-0 left-0 right-0 flex items-center p-4 bg-white border-t">
        <Link href="/tab">
          <button className="flex-1 text-gray-500 flex flex-col items-center">
            <AiOutlineHome className="mb-1 w-6 h-6" />
            <span className="text-xs">首页</span>
          </button>
        </Link>
        <Link href="/contact">
          <button className="flex-1 text-gray-500 flex flex-col items-center">
            <FiUser className="mb-1 w-6 h-6" />
            <span className="text-xs">客服</span>
          </button>
        </Link>
        <Link href="/tab/cart">
          <button className="flex-1 text-gray-500 flex flex-col items-center">
            <AiOutlineShoppingCart className="mb-1 w-6 h-6" />
            <span className="text-xs">购物车</span>
          </button>
        </Link>
        <button
          className="flex-1 bg-yellow-400 text-white py-2 rounded-full"
          onClick={handleAddToCartClick}
        >
          加入购物车
        </button>
        <button
          className="flex-1 bg-red-500 text-white py-2 rounded-full"
          onClick={handleBuyNow}
        >
          立即购买
        </button>
      </div>

      <AddToCartModal
        isOpen={showModal}
        onClose={handleModalClose}
        product={product}
        quantity={quantity}
        setQuantity={setQuantity}
        onAddToCart={handleAddToCart}
      />
    </div>
  );
}