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 { Button } from '@chakra-ui/react';
import { 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 { TicketIcon } from '@heroicons/react/24/solid';

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

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

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

  const {
    setAskAdminUrl,
    askAdminUrl,
    activeVariantId,
    setIsApproval,
    isApproval,
    setSelectedVariant,
    setSla,
    selectedVariant,
  } = 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]);

  useEffect(() => {
    if (typeof auth === 'object') {
      setIsApproval(auth?.feature?.soApproval);
    }
    const selectedVariant =
      product?.variants?.find((variant) => variant.is_in_bu) ||
      product?.variants?.[0];
    setSelectedVariant(selectedVariant);
  }, []);

  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 [discount, setDiscount] = useState(0);
  const [voucherDiscount, setVoucherDiscount] = useState(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;
    el.scrollTo({ left: i * el.clientWidth, behavior: 'smooth' });
    setCurrentIdx(i);
    setMainImage(allImages[i] || '');
  };

  useEffect(() => {
    // ambil voucher dari PRODUCT (bukan variant)
    const voucherRaw = Array.isArray(product?.new_voucher_pasti_hemat)
      ? product.new_voucher_pasti_hemat[0]
      : product?.new_voucher_pasti_hemat;

    if (!voucherRaw) {
      setVoucherDiscount(0);
      return;
    }

    // ambil harga dari VARIANT aktif
    // kalau belum ada selectedVariant, fallback ke product.lowest_price
    const basePriceObj = selectedVariant?.price || {
      price: product?.lowest_price?.price ?? 0,
      priceDiscount: product?.lowest_price?.price_discount ?? 0,
    };

    const {
      discount_type = '',
      discount_amount = 0,
      max_discount = 0,
      min_purchase = 0,
    } = voucherRaw;

    // harga dasar dipakai priceDiscount dulu, kalau kosong pakai price
    const basePrice =
      Number(basePriceObj.priceDiscount ?? 0) ||
      Number(basePriceObj.price ?? 0);

    if (!basePrice) {
      setVoucherDiscount(0);
      return;
    }

    // cek minimum belanja
    if (Number(min_purchase) > 0 && basePrice < Number(min_purchase)) {
      setVoucherDiscount(0);
      return;
    }

    // hitung potongan
    let cut = 0;

    if (discount_type === 'percentage') {
      // contoh: 8.33 (%)
      const pct = Number(discount_amount) || 0;
      cut = basePrice * (pct / 100);
    } else {
      // fixed amount
      cut = Number(discount_amount) || 0;
    }

    // batas maksimal diskon
    if (Number(max_discount) > 0 && cut > Number(max_discount)) {
      cut = Number(max_discount);
    }

    // final clamp
    cut = cut > 0 ? Math.floor(cut) : 0;

    setVoucherDiscount(cut);
  }, [product, selectedVariant]);

  return (
    <>
      <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, tanpa thumbnail carousel === */}
              {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'
                        >
                          <img
                            src={img}
                            alt={`Gambar ${i + 1}`}
                            className='w-full aspect-square object-contain block'
                            onError={(e) => {
                              (e.target as HTMLImageElement).src =
                                '/images/noimage.jpeg';
                            }}
                          />
                        </div>
                      ))
                    ) : (
                      <div className='w-full flex-shrink-0 snap-center'>
                        <img
                          src={mainImage || '/images/noimage.jpeg'}
                          alt='Gambar produk'
                          className='w-full aspect-square object-contain block'
                        />
                      </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: Tetap seperti sebelumnya === */}
                  <ProductImage product={{ ...product, image: mainImage }} />

                  {/* Carousel horizontal (thumbnail) – hanya desktop */}
                  {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>
            {/* <<=== TUTUP kolom kiri */}

            {/* ===== Kolom kanan: info ===== */}
            <div className='md:w-8/12 px-4 md:pl-6'>
              {/* <div className='h-6 md:h-0' />
              {isMobile && voucherDiscount > 0 && (
                <div className='text text-sm font-medium'>
                  <TicketIcon className='inline text-yellow-300 w-5 h-5' />{' '}
                  Pakai{' '}
                  <span className='text-green-600 font-extrabold'>
                    {' '}
                    Voucher belanja hemat {currencyFormat(voucherDiscount)}
                  </span>{' '}
                  saat checkout
                </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' />

            <div className={style['section-card']}>
              <h2 className={style['heading']}>Informasi Produk</h2>
              <div className='h-4' />
              <div className='overflow-x-auto'>
                <div
                  className={style['description']}
                  dangerouslySetInnerHTML={{
                    __html:
                      !product.description ||
                      product.description == '<p><br></p>'
                        ? 'Belum ada deskripsi'
                        : product.description,
                  }}
                />
              </div>
            </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} />}
              >
                Ask Admin
              </Button>

              <span>|</span>

              <AddToWishlist productId={product.id} />

              <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} />}
                  >
                    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} />
          </LazyLoadComponent>
        </div>

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

export default ProductDetail;