import dynamic from 'next/dynamic'
import { useEffect, useState } from 'react'
import { useRouter } from 'next/router'
import Seo from '../../../core/components/Seo.jsx'
import Promocrumb from '../../../lib/promo/components/Promocrumb.jsx'
import { fetchPromoItemsSolr } from '../../../api/promoApi.js'
import LogoSpinner from '../../../core/components/elements/Spinner/LogoSpinner.jsx'
import ProductPromoCard from '../../../../src-migrate/modules/product-promo/components/Card.tsx'
import { IPromotion } from '../../../../src-migrate/types/promotion.ts'
import React from 'react'
import { SolrResponse } from "../../../../src-migrate/types/solr.ts";

const BasicLayout = dynamic(() => import('../../../core/components/layouts/BasicLayout.jsx'))

export default function Promo() {
  const router = useRouter()
  const { slug = '' } = router.query
  const [promoItems, setPromoItems] = useState<any[]>([])
  const [promoData, setPromoData] = useState<IPromotion[] | null>(null)
  const [loading, setLoading] = useState(true)
  const [currentPage, setCurrentPage] = useState(1)
  const [fetchingData, setFetchingData] = useState(false)

  useEffect(() => {
    const loadPromo = async () => {
      try {
        const items = await fetchPromoItemsSolr(`*:*`)
        
        
        setPromoItems(items)
        

        if (items.length === 0) {
          setPromoData([])
          setLoading(false);
          return;
        }

        const promoDataPromises = items.map(async (item) => {
          const queryParams = new URLSearchParams({ q: `id:${item.id}` })
          

          try {
            const response = await fetch(`/solr/promotion_program_lines/select?${queryParams.toString()}`)
            
            if (!response.ok) {
              throw new Error(`HTTP error! status: ${response.status}`)
            }

            const data: SolrResponse<any[]> = await response.json()
            
            
            const promotions = await map(data.response.docs)
            return promotions;
          } catch (fetchError) {
            console.error("Error fetching promotion data:", fetchError)
            return [];
          }
        });

        const promoDataArray = await Promise.all(promoDataPromises);
        const mergedPromoData = promoDataArray.reduce((accumulator, currentValue) => accumulator.concat(currentValue), []);
        setPromoData(mergedPromoData);
        setTimeout(() => setLoading(false), 120); // Menambahkan delay 200ms sebelum mengubah status loading
      } catch (loadError) {
        console.error("Error loading promo items:", loadError)
        setLoading(false);
      }
    }

    if (slug) {
      loadPromo()
    }
  }, [slug])

  const map = async (promotions: any[]): Promise<IPromotion[]> => {
    const result: IPromotion[] = []
  
    for (const promotion of promotions) {
      const data: IPromotion = {
        id: promotion.id,
        program_id: promotion.program_id_i,
        name: promotion.name_s,
        type: {
          value: promotion.type_value_s,
          label: promotion.type_label_s,
        },
        limit: promotion.package_limit_i,
        limit_user: promotion.package_limit_user_i,
        limit_trx: promotion.package_limit_trx_i,
        price: promotion.price_f,
        total_qty: promotion.total_qty_i,
        products: JSON.parse(promotion.products_s),
        free_products: JSON.parse(promotion.free_products_s),
      }
  
      result.push(data)
    }
  
    return result
  }

  
  

  useEffect(() => {
    const handleScroll = () => {
      if (
        !fetchingData &&
        window.innerHeight + document.documentElement.scrollTop >= 0.95 * document.documentElement.offsetHeight
      ) {
        // User has scrolled to 95% of page height
        
        setTimeout(() => setFetchingData(true), 120);
        setCurrentPage((prevPage) => prevPage + 1)
      }
    }

    window.addEventListener('scroll', handleScroll)
    return () => window.removeEventListener('scroll', handleScroll)
  }, [fetchingData])

  useEffect(() => {
    if (fetchingData) {
      // Fetch more data
      // You may need to adjust this logic according to your API
      fetchMoreData()
    }
  }, [fetchingData])

  const fetchMoreData = async () => {
    try {
      // Add a delay of approximately 150ms
      setTimeout(async () => {
        // Fetch more data
        // Update promoData state with the new data
      }, 150)
    } catch (error) {
      console.error('Error fetching more data:', error)
    } finally {
      setTimeout(() => setFetchingData(false), 120);
      
    }
  }

  const visiblePromotions = promoData?.slice(0, currentPage * 12)

  return (
    <BasicLayout>
      <Seo
        title={`Promo ${Array.isArray(slug) ? slug[0] : slug} Terkini`} 
        description='B2B Marketplace MRO & Industri dengan Layanan Pembayaran Tempo, Faktur Pajak, Online Quotation, Garansi Resmi & Harga Kompetitif'
      />
      {/* <Promocrumb brandName={capitalizeFirstLetter(Array.isArray(slug) ? slug[0] : slug)} />  */}
      <div className='container mx-auto mt-1 flex mb-1'>
        <div className=''>
          <h1 className='font-semibold'>Semua Promo di Indoteknik</h1>
        </div>
      </div>
      {loading ? (
        <div className='container flex justify-center my-4'>
          <LogoSpinner width={48} height={48} />
        </div>
      ) : promoData && promoItems.length >= 1 ? (
        <>
          <div className='flex flex-wrap justify-center'>
            {visiblePromotions?.map((promotion) => (
              <div key={promotion.id} className="min-w-[40px] max-w-[400px] mr-[20px] mb-[20px] sm:w-full md:w-1/2 lg:w-1/3 xl:w-1/4">
                <ProductPromoCard promotion={promotion}  />
              </div>
            ))}
          </div>
          {fetchingData && (
            <div className='container flex justify-center my-4'>
              <LogoSpinner width={48} height={48} />
            </div>
          )}
        </>
      ) : (
        <div className="text-center my-8">
          <p>Belum ada promo pada kategori ini</p>
        </div>
      )}
    </BasicLayout>
  )
}