"use client";

import { useEffect, useState, Suspense } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import Image from "next/image";
import PaymentModal from "@/components/PaymentModal";

function CheckoutContent() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const [products, setProducts] = useState([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [address, setAddress] = useState(null);
  const [showPaymentModal, setShowPaymentModal] = useState(false);

  // 获取地址的函数
  const fetchAddress = async (token) => {
    const addressRes = await fetch("/api/address", {
      headers: {
        Authorization: `Bearer ${token}`,
      },
    });

    if (addressRes.ok) {
      const addresses = await addressRes.json();
      const selectedAddress = localStorage.getItem("selectedAddress");

      if (selectedAddress) {
        const parsedSelectedAddress = JSON.parse(selectedAddress);
        // 在服务器返回的地址列表中查找选中的地址
        const matchedAddress = addresses.find(
          (addr) => addr._id === parsedSelectedAddress._id
        );
        if (matchedAddress) {
          setAddress(matchedAddress);
          localStorage.removeItem("selectedAddress");
          return;
        }
      }

      // 如果没有匹配到选中的地址，使用默认地址
      const defaultAddress = addresses.find((addr) => addr.isDefault);
      if (defaultAddress) {
        setAddress(defaultAddress);
      } else if (addresses.length > 0) {
        setAddress(addresses[0]);
      }
    }
  };

  // 获取商品信息的函数
  const fetchProducts = async () => {
    const items = searchParams.get("items");
    if (items) {
      const productPromises = items.split(",").map(async (item) => {
        const [productId, quantity] = item.split(":");
        const res = await fetch(`/api/products/${productId}`);
        if (!res.ok) {
          throw new Error("获取商品信息失败");
        }
        const product = await res.json();
        return { ...product, quantity: parseInt(quantity) };
      });

      const productsData = await Promise.all(productPromises);
      setProducts(productsData);
      return;
    }

    const productId = searchParams.get("products");
    const quantity = searchParams.get("quantity");

    if (!productId || !quantity) {
      throw new Error("商品信息不完整");
    }

    const res = await fetch(`/api/products/${productId}`);
    if (!res.ok) {
      throw new Error("获取商品信息失败");
    }

    const product = await res.json();
    setProducts([{ ...product, quantity: parseInt(quantity) }]);
  };

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

    const fetchData = async () => {
      try {
        await fetchAddress(token);
        await fetchProducts();
      } catch (err) {
        setError(err.message);
      } finally {
        setLoading(false);
      }
    };

    fetchData();
  }, []);

  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>;

  const total = products.reduce(
    (sum, item) => sum + item.price * item.quantity,
    0
  );

  const getReturnUrl = () => {
    const items = searchParams.get("items");
    const products = searchParams.get("products");
    const quantity = searchParams.get("quantity");

    let params = new URLSearchParams();
    if (items) {
      params.append("items", items);
    } else if (products && quantity) {
      params.append("products", products);
      params.append("quantity", quantity);
    }

    return `/address?returnUrl=${encodeURIComponent(
      "/checkout"
    )}&${params.toString()}`;
  };

  const handleSubmitOrder = () => {
    setShowPaymentModal(true);
  };

  return (
    <div className="min-h-screen bg-gray-50 pb-20">
      <div className="p-4">
        <h1 className="text-xl font-bold mb-4">确认订单</h1>

        {/* 收货地址 */}
        <button
          onClick={() => router.replace(getReturnUrl())}
          className="block w-full bg-white rounded-lg p-4 mb-4 text-left"
        >
          {address ? (
            <div className="flex justify-between items-center">
              <div>
                <div className="flex items-center gap-2">
                  <span className="font-medium">{address.name}</span>
                  <span>{address.phone}</span>
                </div>
                <div className="text-gray-500 text-sm mt-1">
                  {address.address}
                </div>
              </div>
              <svg
                className="w-4 h-4 text-gray-400"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M9 5l7 7-7 7"
                />
              </svg>
            </div>
          ) : (
            <div className="flex justify-between items-center text-gray-500">
              <span>请选择收货地址</span>
              <svg
                className="w-4 h-4"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M9 5l7 7-7 7"
                />
              </svg>
            </div>
          )}
        </button>

        {/* 商品列表 */}
        <div className="bg-white rounded-lg p-4 mb-4">
          {products.map((product) => (
            <div key={product._id} className="flex items-center">
              <Image
                src={product.imageUrl}
                alt={product.title}
                width={80}
                height={80}
                className="rounded"
              />
              <div className="ml-4 flex-1">
                <h3 className="font-medium">{product.title}</h3>
                <div className="flex justify-between mt-2">
                  <span className="text-red-500">¥{product.price}</span>
                  <span>x{product.quantity}</span>
                </div>
              </div>
            </div>
          ))}
        </div>

        {/* 订单总计 */}
        <div className="fixed bottom-0 left-0 right-0 bg-white p-4 border-t">
          <div className="flex justify-between items-center mb-4">
            <span>总计：</span>
            <span className="text-xl text-red-500 font-bold">¥{total}</span>
          </div>
          <button
            className="w-full bg-red-500 text-white py-3 rounded-full"
            disabled={!address}
            onClick={handleSubmitOrder}
          >
            提交订单
          </button>
        </div>

        <PaymentModal
          isOpen={showPaymentModal}
          onClose={() => setShowPaymentModal(false)}
          amount={total}
        />
      </div>
    </div>
  );
}

export default function Checkout() {
  return (
    <Suspense fallback={<div className="p-4">加载中...</div>}>
      <CheckoutContent />
    </Suspense>
  );
}