import Image from "next/image";
import { getProductBySlug, getProducts, getProductPrice, getProductImage, getLocalizedProduct, formatPrice } from "@/lib/saleor";
import Header from "@/components/layout/Header";
import Footer from "@/components/layout/Footer";
import type { Product } from "@/types/saleor";

interface ProductPageProps {
  params: Promise<{ slug: string; locale?: string }>;
}

// Generate static params for all products
export async function generateStaticParams() {
  try {
    const products = await getProducts("SR", 100);
    const params: Array<{ slug: string; locale: string }> = [];
    
    products.forEach((product: Product) => {
      // Serbian slug
      params.push({ slug: product.slug, locale: "sr" });
      
      // English slug (if translation exists)
      if (product.translation?.slug) {
        params.push({ slug: product.translation.slug, locale: "en" });
      }
    });
    
    return params;
  } catch (e) {
    return [];
  }
}

export async function generateMetadata({ params }: ProductPageProps) {
  const { slug, locale = "sr" } = await params;
  const product = await getProductBySlug(slug, locale.toUpperCase());
  
  if (!product) {
    return {
      title: locale === "en" ? "Product Not Found" : "Proizvod nije pronađen",
    };
  }
  
  const localized = getLocalizedProduct(product, locale.toUpperCase());
  
  return {
    title: localized.name,
    description: localized.seoDescription || localized.description?.slice(0, 160),
    alternates: {
      canonical: `/products/${product.slug}`,
      languages: {
        "sr": `/products/${product.slug}`,
        "en": product.translation?.slug ? `/products/${product.translation.slug}` : `/products/${product.slug}`,
      },
    },
  };
}

export default async function ProductPage({ params }: ProductPageProps) {
  const { slug, locale = "sr" } = await params;
  const product = await getProductBySlug(slug, locale.toUpperCase());
  
  if (!product) {
    return (
      <main className="min-h-screen">
        <Header />
        <div className="pt-24 text-center">
          <h1 className="text-2xl">
            {locale === "en" ? "Product not found" : "Proizvod nije pronađen"}
          </h1>
        </div>
        <Footer />
      </main>
    );
  }

  const localized = getLocalizedProduct(product, locale.toUpperCase());
  const image = getProductImage(product);
  const price = getProductPrice(product);
  const variant = product.variants?.[0];
  const isAvailable = variant?.quantityAvailable > 0;

  // Determine language based on which slug matched
  const isEnglishSlug = slug === product.translation?.slug;
  const currentLocale = isEnglishSlug ? "en" : "sr";
  
  // URLs for language switcher
  const serbianUrl = `/products/${product.slug}`;
  const englishUrl = product.translation?.slug 
    ? `/products/${product.translation.slug}`
    : serbianUrl;

  return (
    <main className="min-h-screen">
      <Header />
      
      <section className="pt-24 pb-20 px-4">
        <div className="max-w-7xl mx-auto">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-12">
            {/* Product Image */}
            <div className="relative aspect-[4/5] bg-background-ice overflow-hidden">
              <Image 
                src={image}
                alt={localized.name}
                fill
                className="object-cover"
                priority
              />
            </div>

            {/* Product Info */}
            <div className="flex flex-col">
              <h1 className="text-4xl font-serif mb-4">{localized.name}</h1>
              
              {price && (
                <div className="text-2xl mb-6">{price}</div>
              )}
              
              {localized.description && (
                <div 
                  className="prose max-w-none mb-8" 
                  dangerouslySetInnerHTML={{ __html: localized.description }} 
                />
              )}
              
              {/* Add to Cart Button */}
              <button 
                className="inline-block bg-foreground text-white px-8 py-4 text-lg font-medium text-center hover:bg-opacity-90 transition-all disabled:opacity-50 disabled:cursor-not-allowed"
                disabled={!isAvailable}
              >
                {isAvailable 
                  ? (currentLocale === "en" ? "Add to Cart" : "Dodaj u korpu")
                  : (currentLocale === "en" ? "Out of Stock" : "Nema na stanju")
                }
              </button>

              {/* SKU */}
              {variant?.sku && (
                <p className="mt-4 text-sm text-foreground-muted">
                  SKU: {variant.sku}
                </p>
              )}

              {/* Language Switcher */}
              <div className="mt-8 pt-8 border-t">
                <p className="text-sm text-foreground-muted mb-2">
                  {currentLocale === "en" ? "Language:" : "Jezik:"}
                </p>
                <div className="flex gap-4">
                  <a 
                    href={serbianUrl} 
                    className={`text-sm font-medium ${currentLocale === "sr" ? "text-foreground" : "text-foreground-muted hover:text-foreground"}`}
                  >
                    🇷🇸 Srpski
                  </a>
                  <a 
                    href={englishUrl}
                    className={`text-sm font-medium ${currentLocale === "en" ? "text-foreground" : "text-foreground-muted hover:text-foreground"}`}
                  >
                    🇬🇧 English
                  </a>
                </div>
              </div>
            </div>
          </div>
        </div>
      </section>
      
      <Footer />
    </main>
  );
}