import type { PublicCategory, PublicProductDetail, SiteSettings } from "@imen/shared";
import { siteConfig } from "../config/site";

type Json = Record<string, unknown>;

/** Values every schema builder needs: editable settings + the absolute site URL */
export interface SeoContext {
  settings: SiteSettings;
  siteUrl: string;
}

const abs = (ctx: SeoContext, p: string) => new URL(p, ctx.siteUrl).toString();

/** Social profile links worth listing in `sameAs` (not mail/phone/own site) */
const PROFILE_TYPES = new Set(["telegram", "instagram", "linkedin", "whatsapp", "bale", "eitaa", "aparat", "youtube"]);

const clean = <T extends object>(o: T): Json =>
  JSON.parse(
    JSON.stringify(o, (_, v) =>
      v === "" || (Array.isArray(v) && !v.length) ? undefined : v,
    ),
  );

export const organizationSchema = (ctx: SeoContext) => {
  const s = ctx.settings;
  return clean({
    "@context": "https://schema.org",
    "@type": "LocalBusiness",
    "@id": `${ctx.siteUrl}/#organization`,
    name: s.name,
    alternateName: s.nameEn,
    url: abs(ctx, "/"),
    logo: abs(ctx, siteConfig.logo),
    image: abs(ctx, s.ogImage.url),
    description: s.description,
    email: s.email,
    telephone: s.phone,
    foundingDate: s.foundingDate,
    areaServed: siteConfig.areaServed,
    address: {
      "@type": "PostalAddress",
      streetAddress: s.address.street,
      addressLocality: s.address.locality,
      addressCountry: s.address.country,
    },
    openingHoursSpecification: {
      "@type": "OpeningHoursSpecification",
      dayOfWeek: s.openingHours.days,
      opens: s.openingHours.opens,
      closes: s.openingHours.closes,
    },
    sameAs: s.socials.filter((x) => PROFILE_TYPES.has(x.type)).map((x) => x.url),
  });
};

export const websiteSchema = (ctx: SeoContext) => ({
  "@context": "https://schema.org",
  "@type": "WebSite",
  "@id": `${ctx.siteUrl}/#website`,
  url: abs(ctx, "/"),
  name: ctx.settings.name,
  inLanguage: siteConfig.lang,
  publisher: { "@id": `${ctx.siteUrl}/#organization` },
});

export const serviceSchema = (
  ctx: SeoContext,
  opts: { name: string; description: string; areaServed?: string },
) =>
  clean({
    "@context": "https://schema.org",
    "@type": "Service",
    name: opts.name,
    description: opts.description,
    areaServed: opts.areaServed ?? siteConfig.areaServed,
    provider: { "@id": `${ctx.siteUrl}/#organization` },
  });

export const categoryPageSchema = (ctx: SeoContext, category: PublicCategory) =>
  clean({
    "@context": "https://schema.org",
    "@type": "CollectionPage",
    "@id": `${ctx.siteUrl}/categories/${category.slug}`,
    name: category.name,
    description: category.seoDescription || category.fullDesc,
    url: abs(ctx, `/categories/${category.slug}`),
    isPartOf: { "@id": `${ctx.siteUrl}/#website` },
    provider: { "@id": `${ctx.siteUrl}/#organization` },
    mainEntity: {
      "@type": "ItemList",
      numberOfItems: category.products.length,
      itemListElement: category.products.map((p, i) => ({
        "@type": "ListItem",
        position: i + 1,
        item: {
          "@type": "Product",
          name: p.name,
          description: p.desc,
          sku: p.code,
          url: abs(ctx, `/products/${p.slug}`),
          ...(p.image && { image: abs(ctx, p.image) }),
        },
      })),
    },
  });

export const productSchema = (ctx: SeoContext, p: PublicProductDetail) =>
  clean({
    "@context": "https://schema.org",
    "@type": "Product",
    "@id": `${ctx.siteUrl}/products/${p.slug}#product`,
    name: p.name,
    alternateName: p.nameEn,
    sku: p.code,
    mpn: p.code,
    description: p.seoDescription || p.desc || p.details.slice(0, 300),
    url: abs(ctx, `/products/${p.slug}`),
    image: p.images.map((i) => abs(ctx, i.url)),
    category: p.category.name,
    ...(p.brand && { brand: { "@type": "Brand", name: p.brand } }),
    countryOfOrigin: p.origin,
    additionalProperty: [
      ...p.attributes.map((a) => ({ "@type": "PropertyValue", name: a.name, value: a.value })),
      ...p.standards.map((s) => ({ "@type": "PropertyValue", name: "استاندارد", value: s })),
    ],
    seller: { "@id": `${ctx.siteUrl}/#organization` },
  });

export const breadcrumbSchema = (ctx: SeoContext, items: { name: string; path: string }[]) => ({
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  itemListElement: items.map((it, i) => ({
    "@type": "ListItem",
    position: i + 1,
    name: it.name,
    item: abs(ctx, it.path),
  })),
});

/** Serialize JSON-LD safely for an inline <script> (escape "<"). */
export const toJsonLd = (data: Json) =>
  JSON.stringify(data).replace(/</g, "\\u003c");