import style from '../styles/product-detail.module.css';

import Link from 'next/link';
import { useRouter } from 'next/router';
import { useEffect, useRef, useState, UIEvent } from 'react';

// Import komponen Chakra UI
import { 
  Button, 
  Tabs, 
  TabList, 
  TabPanels, 
  Tab, 
  TabPanel, 
  Table, 
  Tbody, 
  Tr, 
  Td,
  Box,
  Spinner,
  Center,
  Text
} from '@chakra-ui/react';

// Import Icons
import {
  AlertTriangle,
  MessageCircleIcon,
  Share2Icon,
} from 'lucide-react';

import { LazyLoadComponent } from 'react-lazy-load-image-component';

import useDevice from '@/core/hooks/useDevice';
import { getAuth } from '~/libs/auth';
import { whatsappUrl } from '~/libs/whatsappUrl';
import ProductPromoSection from '~/modules/product-promo/components/Section';
import { IProductDetail } from '~/types/product';
import { useProductDetail } from '../stores/useProductDetail';
import AddToWishlist from './AddToWishlist';
import Breadcrumb from './Breadcrumb';
import ProductImage from './Image';
import Information from './Information';
import PriceAction from './PriceAction';
import SimilarBottom from './SimilarBottom';
import SimilarSide from './SimilarSide';
import dynamic from 'next/dynamic';

import { gtagProductDetail } from '@/core/utils/googleTag';

type Props = {
  product: IProductDetail;
};

const RWebShare = dynamic(
  () => import('react-web-share').then((m) => m.RWebShare),
  { ssr: false }
);

const SELF_HOST = process.env.NEXT_PUBLIC_SELF_HOST;

const ProductDetail = ({ product }: Props) => {
  const { isDesktop, isMobile } = useDevice();
  const router = useRouter();
  const [auth, setAuth] = useState<any>(null);
  
  // State Data dari Magento
  const [specs, setSpecs] = useState<{ code: string; label: string; value: string }[]>([]);
  const [upsellIds, setUpsellIds] = useState<number[]>([]);
  const [loadingSpecs, setLoadingSpecs] = useState(false);
  const [errorSpecs, setErrorSpecs] = useState(false);

  useEffect(() => {
    try {
      setAuth(getAuth() ?? null);
    } catch {}
  }, []);

  const canShare =
    typeof navigator !== 'undefined' &&
    typeof (navigator as any).share === 'function';

  const {
    setAskAdminUrl,
    askAdminUrl,
    activeVariantId,
    setIsApproval,
    isApproval,
    selectedVariant, 
    setSelectedVariant,
  } = useProductDetail();

  useEffect(() => {
    gtagProductDetail(product);
  }, [product]);

  useEffect(() => {
    const createdAskUrl = whatsappUrl({
      template: 'product',
      payload: {
        manufacture: product.manufacture.name,
        productName: product.name,
        url: process.env.NEXT_PUBLIC_SELF_HOST + router.asPath,
      },
      fallbackUrl: router.asPath,
    });

    setAskAdminUrl(createdAskUrl);
  }, [router.asPath, product.manufacture.name, product.name, setAskAdminUrl]);

  // =========================================================================
  // LOGIC INISIALISASI VARIANT (HANDLE NAVIGASI)
  // =========================================================================
  useEffect(() => {
    if (typeof auth === 'object') {
      setIsApproval(auth?.feature?.soApproval);
    }
    const variantInit =
      product?.variants?.find((variant) => variant.is_in_bu) ||
      product?.variants?.[0];
    
    setSelectedVariant(variantInit);

    // Reset data Magento saat produk berubah
    setSpecs([]);
    setUpsellIds([]);
    
  }, [product, auth]); 

  // =========================================================================
  // LOGIC FETCH: SPECS & UPSELLS
  // =========================================================================
  useEffect(() => {
    const fetchMagentoData = async () => {
      // Gunakan ID Variant (SKU Odoo)
      const idToFetch = selectedVariant?.id; 

      if (!idToFetch) return;

      setLoadingSpecs(true);
      setErrorSpecs(false);
      
      try {
        console.log("Fetching Magento data via Proxy for ID:", idToFetch);
        
        const endpoint = `/api/magento-product?sku=${encodeURIComponent(String(idToFetch))}`;

        const response = await fetch(endpoint, {
            method: 'GET',
            headers: { 'Content-Type': 'application/json' }
        });

        if (!response.ok) {
            console.warn(`Magento API status: ${response.status}`);
            setSpecs([]);
            setUpsellIds([]);
            return;
        }

        const data = await response.json();

        // 1. Simpan Data Spesifikasi
        if (data.specs && Array.isArray(data.specs)) {
           setSpecs(data.specs);
        } else {
           setSpecs([]);
        }

        // 2. Simpan Data Up-Sells (ID)
        if (data.upsell_ids && Array.isArray(data.upsell_ids)) {
            setUpsellIds(data.upsell_ids);
        } else {
            setUpsellIds([]);
        }

      } catch (error) {
        console.error("Gagal mengambil data Magento:", error);
        setErrorSpecs(true);
        setSpecs([]);
        setUpsellIds([]);
      } finally {
        setLoadingSpecs(false);
      }
    };

    fetchMagentoData();
  }, [selectedVariant, product.id]); 


  // =========================================================================
  // HELPER: RENDER SPEC VALUE (SIMPLE TEXT/HTML ONLY)
  // =========================================================================
  const renderSpecValue = (item: { code: string; label: string; value: string }) => {
    const val = item.value;
    if (!val) return '-';
    
    // Cek apakah mengandung tag HTML sederhana (<p>, <a>, <ul>, dll)
    if (val.includes('<') && val.includes('>')) {
       return (
         <div 
           className="prose prose-sm text-gray-700"
           dangerouslySetInnerHTML={{ __html: val }}
         />
       );
    }

    // Default: Teks Biasa
    return val;
  };


  const allImages = (() => {
    const arr: string[] = [];
    if (product?.image) arr.push(product.image);
    if (
      Array.isArray(product?.image_carousel) &&
      product.image_carousel.length
    ) {
      const set = new Set(arr);
      for (const img of product.image_carousel) {
        if (!set.has(img)) {
          arr.push(img);
          set.add(img);
        }
      }
    }
    return arr;
  })();

  const [mainImage, setMainImage] = useState(allImages[0] || '');
  const hasPrice = Number(product?.lowest_price?.price) > 0;

  useEffect(() => {
    if (!allImages.includes(mainImage)) {
      setMainImage(allImages[0] || '');
    }
  }, [allImages]);

  const sliderRef = useRef<HTMLDivElement | null>(null);
  const [currentIdx, setCurrentIdx] = useState(0);

  const handleMobileScroll = (e: UIEvent<HTMLDivElement>) => {
    const el = e.currentTarget;
    if (!el) return;
    const idx = Math.round(el.scrollLeft / el.clientWidth);
    if (idx !== currentIdx) {
      setCurrentIdx(idx);
      setMainImage(allImages[idx] || '');
    }
  };

  const scrollToIndex = (i: number) => {
    const el = sliderRef.current;
    if (!el) return;
    const elRef = sliderRef.current;
    elRef.scrollTo({ left: i * elRef.clientWidth, behavior: 'smooth' });
    setCurrentIdx(i);
    setMainImage(allImages[i] || '');
  };

  return (
    <>
      <div className='relative'>
        {isDesktop && !hasPrice && (
          <div className='absolute inset-0 z-[20] flex items-center justify-center pointer-events-none select-none'>
            <img
              src='/images/produk_tidak_tersedia.svg'
              alt='Produk tidak tersedia'
              className='w-[47%] opacity-50 -translate-x-[3%]  -translate-y-[-70%]'
            />
          </div>
        )}
      </div>

      <div className='relative'>
        {isMobile && !hasPrice && (
          <div className='absolute inset-0 z-[50] flex items-center justify-center pointer-events-none select-none'>
            <img
              src='/images/produk_tidak_tersedia.svg'
              alt='Produk tidak tersedia'
              className='w-[100%] opacity-[1000%] -translate-x-[0%]  -translate-y-[-197%]'
            />
          </div>
        )}
      </div>

      <div className='md:flex md:flex-wrap'>
        <div className='w-full mb-4 md:mb-0 px-4 md:px-0'>
          <Breadcrumb id={product.id} name={product.name} />
        </div>

        <div className='md:w-9/12 md:flex md:flex-col md:pr-4 md:pt-6'>
          <div className='md:flex md:flex-wrap'>
            {/* ===== Kolom kiri: gambar ===== */}
            <div className='md:w-4/12'>
              {/* === MOBILE: Slider swipeable === */}
              {isMobile ? (
                <div className='relative'>
                  <div
                    ref={sliderRef}
                    onScroll={handleMobileScroll}
                    className='flex overflow-x-auto snap-x snap-mandatory scroll-smooth no-scrollbar'
                    style={{
                      scrollBehavior: 'smooth',
                      msOverflowStyle: 'none',
                      scrollbarWidth: 'none',
                    }}
                  >
                    {allImages.length > 0 ? (
                      allImages.map((img, i) => (
                        <div
                          key={i}
                          className='w-full flex-shrink-0 snap-center flex justify-center items-center'
                        >
                          <img
                            src={img}
                            alt={`Gambar ${i + 1}`}
                            className='w-[85%] aspect-square object-contain'
                            onError={(e) => {
                              (e.target as HTMLImageElement).src =
                                '/images/noimage.jpeg';
                            }}
                          />
                        </div>
                      ))
                    ) : (
                      <div className='w-full flex-shrink-0 snap-center flex justify-center items-center'>
                        <img
                          src={mainImage || '/images/noimage.jpeg'}
                          alt='Gambar produk'
                          className='w-[85%] aspect-square object-contain'
                        />
                      </div>
                    )}
                  </div>

                  {/* Dots indicator */}
                  {allImages.length > 1 && (
                    <div className='absolute bottom-2 left-0 right-0 flex justify-center gap-2'>
                      {allImages.map((_, i) => (
                        <button
                          key={i}
                          aria-label={`Ke slide ${i + 1}`}
                          className={`w-2 h-2 rounded-full ${
                            currentIdx === i ? 'bg-gray-800' : 'bg-gray-300'
                          }`}
                          onClick={() => scrollToIndex(i)}
                        />
                      ))}
                    </div>
                  )}
                </div>
              ) : (
                <>
                  {/* === DESKTOP === */}
                  <ProductImage product={{ ...product, image: mainImage }} />
                  {allImages.length > 0 && (
                    <div className='mt-4 overflow-x-auto'>
                      <div className='flex space-x-3 pb-3'>
                        {allImages.map((img, index) => (
                          <div
                            key={index}
                            className={`flex-shrink-0 w-16 h-16 cursor-pointer border-2 rounded-md transition-colors ${
                              mainImage === img
                                ? 'border-red-500 ring-2 ring-red-200'
                                : 'border-gray-200 hover:border-gray-300'
                            }`}
                            onClick={() => setMainImage(img)}
                          >
                            <img
                              src={img}
                              alt={`Thumbnail ${index + 1}`}
                              className='w-full h-full object-cover rounded-sm'
                              loading='lazy'
                              onError={(e) => {
                                (e.target as HTMLImageElement).src =
                                  '/images/noimage.jpeg';
                              }}
                            />
                          </div>
                        ))}
                      </div>
                    </div>
                  )}
                </>
              )}
            </div>

            {/* ===== Kolom kanan: info ===== */}
            {isDesktop && (
              <div className='md:w-8/12 px-4 md:pl-6'>
                {!hasPrice && (
                  <div className='bg-red-50 p-2 py-1.5 rounded-lg border border-red-500 flex gap-1 items-center '>
                    <AlertTriangle
                      size={18}
                      className='text-red-600 shrink-0 mx-2'
                    />
                    <h1 className='text-red-600 font-normal text-h-sm'>
                      Maaf untuk saat ini Produk yang anda cari tidak tersedia
                    </h1>
                  </div>
                )}
                <div className='h-6 md:h-0' />
                <h1 className={style['title']}>{product.name}</h1>
                <div className='h-3 md:h-0' />
                <Information product={product} />
                <div className='h-6' />
              </div>
            )}
            {isMobile && (
              <div className='md:w-8/12 px-4 md:pl-6 relative'>
                {!hasPrice && (
                  <div className='bg-red-50 p-2 py-1.5 border-b border-red-500 flex gap-1 items-center w-screen relative left-1/2 right-1/2 -translate-x-1/2'>
                    <AlertTriangle
                      size={18}
                      className='text-red-600 shrink-0 mx-2'
                    />
                    <h1 className='text-red-600 font-normal text-h-sm'>
                      Maaf untuk saat ini Produk yang anda cari tidak tersedia
                    </h1>
                  </div>
                )}
                <h1 className={style['title']}>{product.name}</h1>
                <div className='h-3 md:h-0' />
                <Information product={product} />
                <div className='h-6' />
              </div>
            )}
          </div>

          <div className='h-full'>
            {isMobile && (
              <div className='px-4 pt-6'>
                <PriceAction product={product} />
              </div>
            )}

            <div className='h-4 md:h-10' />
            {!!activeVariantId && !isApproval && (
              <ProductPromoSection
                product={product}
                productId={activeVariantId}
              />
            )}

            <div className='h-0 md:h-6' />

            {/* === SECTION TABS === */}
            <div className={style['section-card']}>
              <Tabs variant="unstyled">
                <TabList borderBottom="1px solid" borderColor="gray.200">
                  <Tab 
                    _selected={{ color: 'red.600', borderColor: 'red.600', borderBottomWidth: '3px', fontWeight: 'bold', marginBottom: '-1.5px' }}
                    color="gray.500" fontWeight="medium" fontSize="sm" px={4} py={3}
                  >
                    Deskripsi
                  </Tab>
                  <Tab 
                    _selected={{ color: 'red.600', borderColor: 'red.600', borderBottomWidth: '3px', fontWeight: 'bold', marginBottom: '-1.5px' }}
                    color="gray.500" fontWeight="medium" fontSize="sm" px={4} py={3}
                  >
                    Spesifikasi
                  </Tab>
                  <Tab 
                    _selected={{ color: 'red.600', borderColor: 'red.600', borderBottomWidth: '3px', fontWeight: 'bold', marginBottom: '-1.5px' }}
                    color="gray.500" fontWeight="medium" fontSize="sm" px={4} py={3}
                  >
                    Detail Lainnya
                  </Tab>
                </TabList>

                <TabPanels>
                  {/* DESKRIPSI */}
                  <TabPanel px={0} py={6}>
                    <div className='overflow-x-auto text-sm text-gray-700'>
                      <div
                        className={style['description']}
                        dangerouslySetInnerHTML={{
                          __html:
                            !product.description || product.description === '<p><br></p>'
                              ? '<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>'
                              : product.description,
                        }}
                      />
                    </div>
                  </TabPanel>

                  {/* SPESIFIKASI */}
                  <TabPanel px={0} py={2}>
                    <Box border="1px solid" borderColor="gray.200" borderRadius="sm">
                        {loadingSpecs ? (
                            <Center py={6}><Spinner color='red.500' /></Center>
                        ) : specs.length > 0 ? (
                            <Table variant="simple" size="md">
                                <Tbody>
                                    {specs.map((item, index) => (
                                        <Tr key={index}>
                                            <Td fontWeight="bold" width="30%" verticalAlign="top" borderColor="gray.200">
                                                {item.label}
                                            </Td>
                                            <Td verticalAlign="top" borderColor="gray.200">
                                                {renderSpecValue(item)}
                                            </Td>
                                        </Tr>
                                    ))}
                                </Tbody>
                            </Table>
                        ) : (
                            <Box p={4} color="gray.500" fontSize="sm">
                                <Text>Spesifikasi teknis belum tersedia.</Text>
                            </Box>
                        )}
                    </Box>
                  </TabPanel>
                  
                   {/* DETAIL LAINNYA */}
                   <TabPanel px={0} py={6}>
                        <p className="text-gray-500 text-sm">Informasi tambahan belum tersedia.</p>
                   </TabPanel>

                </TabPanels>
              </Tabs>
            </div>
          </div>
        </div>

        {isDesktop && (
          <div className='md:w-3/12'>
            <PriceAction product={product} />
            <div className='flex gap-x-5 items-center justify-center'>
              <Button as={Link} href={askAdminUrl} variant='link' target='_blank' colorScheme='gray' leftIcon={<MessageCircleIcon size={18} />} isDisabled={!hasPrice}>Ask Admin</Button>
              <span>|</span>
              <div className={hasPrice ? '' : 'opacity-40 pointer-events-none'}>
                <AddToWishlist productId={product.id} />
              </div>
              <span>|</span>
              {canShare && (
                <RWebShare data={{ text: 'Check out this product', title: `${product.name} - Indoteknik.com`, url: (process.env.NEXT_PUBLIC_SELF_HOST || '') + (router?.asPath || '/'), }}>
                  <Button variant='link' colorScheme='gray' leftIcon={<Share2Icon size={18} />} isDisabled={!hasPrice}>Share</Button>
                </RWebShare>
              )}
            </div>

            <div className='h-6' />
            <div className={style['heading']}>Produk Serupa</div>
            <div className='h-4' />
            <SimilarSide product={product} />
          </div>
        )}

        <div className='md:w-full pt-4 md:py-10 px-4 md:px-0'>
          <div className={style['heading']}>Kamu Mungkin Juga Suka</div>
          <div className='h-6' />
          <LazyLoadComponent>
            <SimilarBottom product={product} upsellIds={upsellIds} />
          </LazyLoadComponent>
        </div>

        <div className='h-6 md:h-0' />
      </div>
    </>
  );
};

export default ProductDetail;