import type { ProductDetailContentDto } from '@dukang/shared-types';
import { Link, useNavigate, useParams } from 'react-router-dom';
import { useEffect, useState } from 'react';
import AppImage from '@dukang/shared-ui/AppImage';
import ProductCarousel from '../components/ProductCarousel';
import AppToast from '../components/AppToast';
import { request } from '../lib/api';
import { track } from '../lib/analytics';
import { handleShareButtonClick } from '../lib/wechat-share';
import { getProductCarouselImages, getProductDetailImages } from '../lib/product-images';
import type { ProductImageSource } from '../lib/product-images';

type Product = ProductImageSource & {
  name: string;
  subtitle?: string;
  price: number;
  benefitAmount?: number;
  detailContent?: ProductDetailContentDto | null;
};

export default function ProductDetailPage() {
  const { id } = useParams();
  const navigate = useNavigate();
  const [product, setProduct] = useState<Product | null>(null);
  const [headerSolid, setHeaderSolid] = useState(false);
  const [toast, setToast] = useState('');

  useEffect(() => {
    if (id) request<Product>('USER_H5', `/catalog/products/${id}`).then(setProduct);
  }, [id]);

  useEffect(() => {
    if (id) {
      track('product_detail_view', { refType: 'PRODUCT', refId: id, productId: id });
    }
  }, [id]);

  useEffect(() => {
    function onScroll() {
      setHeaderSolid(window.scrollY > 100);
    }
    window.addEventListener('scroll', onScroll, { passive: true });
    return () => window.removeEventListener('scroll', onScroll);
  }, []);

  if (!product) return <div className="empty">加载中...</div>;

  const benefit = Number(product.benefitAmount ?? product.price);
  const carouselImages = getProductCarouselImages(product);
  const detailImages = getProductDetailImages(product);
  const detail = product.detailContent ?? {};
  const features = detail.features ?? [];

  return (
    <div className="product-detail-page">
      <header className={`product-detail-header${headerSolid ? ' solid' : ''}`}>
        <button
          type="button"
          className="product-detail-header-btn"
          aria-label="返回"
          onClick={() => navigate('/')}
        >
          <span className="material-symbols-outlined">arrow_back</span>
        </button>
        <h1 className={`app-page-title product-detail-header-title${headerSolid ? ' visible' : ''}`}>
          {product.name}
        </h1>
        <button
          type="button"
          className="product-detail-header-btn"
          aria-label="分享"
          onClick={() => handleShareButtonClick(setToast)}
        >
          <span className="material-symbols-outlined">share</span>
        </button>
      </header>

      <AppToast message={toast} />

      <main className="product-detail-main">
        <section className="product-detail-hero">
          <ProductCarousel images={carouselImages} alt={product.name} variant="detail" />
        </section>

        <section className="product-detail-info">
          <div className="product-detail-price">
            <span className="product-detail-price-symbol">¥</span>
            <span className="product-detail-price-value">{product.price}</span>
          </div>
          <h2 className="product-detail-name">{product.name}</h2>
          {product.subtitle && (
            <p className="product-detail-subtitle">{product.subtitle}</p>
          )}

          <div className="product-detail-promo">
            <div className="product-detail-promo-glow" aria-hidden />
            <div className="product-detail-promo-head">
              <div className="product-detail-promo-icon">
                <span className="material-symbols-outlined fill-icon">confirmation_number</span>
              </div>
              <h3 className="product-detail-promo-title">
                买杜康美酒 · 享全城好客礼遇
                <span className="product-detail-promo-amount">¥{benefit}</span>
              </h3>
            </div>
            <p className="product-detail-promo-desc">
              购酒即享本城专属好客权益，为您安排一场地道饭局。权益金可直接用于本地签约门店消费，到店享用，醇香美酒配佳肴。
            </p>
            <span className="material-symbols-outlined product-detail-promo-deco" aria-hidden>
              restaurant
            </span>
          </div>
        </section>

        <section className="product-detail-content">
          <div className="product-detail-section-head">
            <span className="product-detail-section-bar" />
            <h3>商品详情</h3>
          </div>

          {detailImages.map((src, index) => (
            <AppImage key={`${src}-${index}`} src={src} alt="" wrapperClassName="product-detail-banner" />
          ))}

          {(detail.storyTitle || detail.storyText || features.length > 0) && (
            <div className="product-detail-copy">
              {(detail.storyTitle || detail.storyText) && (
                <div className="product-detail-story">
                  {detail.storyTitle && <h4>{detail.storyTitle}</h4>}
                  {detail.storyText && <p>{detail.storyText}</p>}
                </div>
              )}

              {features.length > 0 && (
                <div className="product-detail-features">
                  {features.map((f) => (
                    <div key={`${f.title}-${f.icon}`} className="product-detail-feature">
                      <span className="material-symbols-outlined">{f.icon}</span>
                      <div className="product-detail-feature-title">{f.title}</div>
                      <div className="product-detail-feature-desc">{f.desc}</div>
                    </div>
                  ))}
                </div>
              )}
            </div>
          )}
        </section>
      </main>

      <nav className="product-detail-bar">
        <Link to="/" className="product-detail-bar-home">
          <span className="material-symbols-outlined">home</span>
          <span>首页</span>
        </Link>
        <button
          type="button"
          className="product-detail-buy-btn"
          onClick={() => {
            track('product_click', { refType: 'PRODUCT', refId: id, productId: id });
            navigate(`/order/confirm?productId=${id}&qty=2`);
          }}
        >
          立即购买
        </button>
      </nav>
    </div>
  );
}