'use client'
import React, {useEffect, useMemo, useState} from 'react';
import Link from 'next/link';
import Image from 'next/image';

interface ProductMenuProps {
  products: ProductCategory[]
}

export default function CoreProducts({products}: ProductMenuProps) {

  const BASE_URL = process.env.NEXT_PUBLIC_BASE_URL as string

  const filteredProducts = useMemo(() => {
    return (products ?? []).filter((item) => item.productCategoryName !== "软件产品")
  }, [products])

  const orderedProducts = useMemo(() => {
    return [...filteredProducts].reverse()
  }, [filteredProducts])

  const tabs = useMemo(() => {
    const allTypes = (orderedProducts ?? []).flatMap((category) => category.productTypes ?? [])
    return Array.from(new Set(allTypes.map((type) => type.productTypeName)))
  }, [orderedProducts])

  const [activeTab, setActiveTab] = useState(() => tabs[0] ?? "")
  const [isPaused, setIsPaused] = useState(false)

  useEffect(() => {
    if (tabs.length === 0) return
    if (!activeTab || !tabs.includes(activeTab)) {
      setActiveTab(tabs[0])
    }
  }, [tabs, activeTab])

  useEffect(() => {
    if (tabs.length === 0 || isPaused) return

    const intervalId = setInterval(() => {
      setActiveTab((prev) => {
        const currentIndex = tabs.indexOf(prev)
        const safeIndex = currentIndex === -1 ? 0 : currentIndex
        const nextIndex = (safeIndex + 1) % tabs.length
        return tabs[nextIndex]
      })
    }, 5000)

    return () => clearInterval(intervalId)
  }, [tabs, isPaused])

  const showProducts = useMemo(() => {
    if (!activeTab) return []
    const allTypes = (orderedProducts ?? []).flatMap((category) => category.productTypes ?? [])
    const matched = allTypes
      .filter((type) => type.productTypeName === activeTab)
      .flatMap((type) => type.productCenters ?? [])

    return matched.slice(0, 4)
  }, [orderedProducts, activeTab])

  return (
    <section className="w-full max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">

      <div className="w-full border border-gray-300 rounded-md overflow-hidden">
        <div className="flex overflow-x-auto">
          {tabs.map((tab) => (
            <div
              key={tab}
              onClick={() => setActiveTab(tab)}
              className={`flex-1 min-w-36 sm:min-w-44 py-3 sm:py-4 text-center shuheiti transition-colors cursor-pointer ${
                activeTab === tab
                  ? "bg-blue-600 text-white font-semibold"
                  : "bg-white text-gray-700 hover:bg-gray-100"
              }`}
            >
              {tab}
            </div>
          ))}
        </div>
      </div>

      <div 
        className="mt-4 sm:mt-6 grid grid-cols-2 sm:grid-cols-2 lg:grid-cols-4 gap-3 sm:gap-6"
        onMouseEnter={() => setIsPaused(true)}
        onMouseLeave={() => setIsPaused(false)}
      >
        {showProducts.map((product) => (
          <Link
            key={product.productId}
            href={`/products/${product.productId}`}
            className="group rounded-xl border border-gray-200 bg-white p-4 sm:p-6 flex flex-col items-center text-center justify-between shadow-sm hover:shadow-md transition-shadow duration-300 cursor-pointer"
          >
            <h3 className="shuheiti text-sm sm:text-xl text-gray-900 line-clamp-1">
              {product.productName}
            </h3>
            <p className="mt-1 text-xs sm:text-sm text-gray-500 w-full">
              <span className="text-blue-800 font-bold line-clamp-2">{product.productIntroduction}</span>
            </p>
            <div className="mt-3 sm:mt-5 w-full overflow-hidden rounded-lg bg-gray-50">
              <Image
                src={product.productUrl ? BASE_URL + product.productUrl : "/assets/productions/2.png"}
                alt={product.productName}
                width={1000}
                height={1000}
                sizes="(max-width: 640px) 50vw, 25vw"
                className="w-full h-auto object-contain p-2 transition-transform duration-300 group-hover:scale-105"
              />
            </div>
            <div className="mt-3 sm:mt-5 w-full flex flex-col items-center gap-1">
                            <span className="text-xs sm:text-sm text-gray-700 line-clamp-1">
                                {product.productType}
                            </span>
              <span className="text-xs text-gray-400 line-clamp-1">
                                {product.productModel}
                            </span>
            </div>
          </Link>
        ))}
      </div>
    </section>
  );
};