import { PLANS, PLAN_ORDER } from "@/lib/billing/plans";
import { SITE_DESCRIPTION, SITE_NAME, SITE_URL, absoluteUrl } from "@/lib/seo";

/**
 * schema.org JSON-LD builders.
 *
 * Everything is emitted into a single `@graph` per page with stable `@id`s, so
 * nodes can reference each other (e.g. the software product is `publisher`-ed by
 * the organization) instead of being repeated on every route.
 */

const ORG_ID = `${SITE_URL}/#organization`;
const SITE_ID = `${SITE_URL}/#website`;
const APP_ID = `${SITE_URL}/#software`;

export function organizationSchema() {
  return {
    "@type": "Organization",
    "@id": ORG_ID,
    name: SITE_NAME,
    url: absoluteUrl("/"),
    description: SITE_DESCRIPTION,
    logo: {
      "@type": "ImageObject",
      url: absoluteUrl("/logo-dark.png"),
      contentUrl: absoluteUrl("/logo-dark.png"),
    },
    contactPoint: [
      {
        "@type": "ContactPoint",
        contactType: "customer support",
        email: "support@podcastdistributionai.com",
        availableLanguage: ["English"],
      },
    ],
  };
}

export function websiteSchema() {
  return {
    "@type": "WebSite",
    "@id": SITE_ID,
    url: absoluteUrl("/"),
    name: SITE_NAME,
    description: SITE_DESCRIPTION,
    publisher: { "@id": ORG_ID },
    inLanguage: "en",
  };
}

/**
 * The product itself, with one Offer per plan. Prices come from the plan catalog
 * so the markup can never drift from what the pricing page actually charges.
 */
export function softwareApplicationSchema() {
  return {
    "@type": "SoftwareApplication",
    "@id": APP_ID,
    name: SITE_NAME,
    url: absoluteUrl("/"),
    description: SITE_DESCRIPTION,
    applicationCategory: "MultimediaApplication",
    applicationSubCategory: "Podcast production",
    operatingSystem: "Web browser",
    publisher: { "@id": ORG_ID },
    featureList: [
      "AI podcast script generation",
      "Realistic multi-voice text-to-speech",
      "AI-generated episode cover art",
      "Content repurposing to blog and social posts",
      "Series and season generator",
      "13+ languages",
      "Team workspace and white-label branding",
      "REST API access",
    ],
    offers: PLAN_ORDER.map((key) => {
      const plan = PLANS[key];
      return {
        "@type": "Offer",
        name: `${plan.name} plan`,
        description: plan.tagline,
        price: (plan.priceMonthly / 100).toFixed(2),
        priceCurrency: "USD",
        category: plan.priceMonthly === 0 ? "Free" : "Subscription",
        url: absoluteUrl("/pricing"),
        availability: "https://schema.org/InStock",
      };
    }),
  };
}

/** A single page node, linked to the site — gives each URL an explicit identity. */
export function webPageSchema({
  path,
  name,
  description,
}: {
  path: string;
  name: string;
  description: string;
}) {
  return {
    "@type": "WebPage",
    "@id": `${absoluteUrl(path)}#webpage`,
    url: absoluteUrl(path),
    name,
    description,
    isPartOf: { "@id": SITE_ID },
    about: { "@id": ORG_ID },
    inLanguage: "en",
  };
}

/** Breadcrumbs from Home to the current page. Pass the trail without Home. */
export function breadcrumbSchema(trail: { name: string; path: string }[]) {
  return {
    "@type": "BreadcrumbList",
    "@id": `${absoluteUrl(trail[trail.length - 1]?.path ?? "/")}#breadcrumb`,
    itemListElement: [{ name: "Home", path: "/" }, ...trail].map((item, i) => ({
      "@type": "ListItem",
      position: i + 1,
      name: item.name,
      item: absoluteUrl(item.path),
    })),
  };
}

export function faqPageSchema(items: { q: string; a: string }[]) {
  return {
    "@type": "FAQPage",
    "@id": `${absoluteUrl("/faq")}#faq`,
    mainEntity: items.map(({ q, a }) => ({
      "@type": "Question",
      name: q,
      acceptedAnswer: { "@type": "Answer", text: a },
    })),
  };
}

/** Wrap nodes into the `@graph` envelope every page emits. */
export function graph(...nodes: Record<string, unknown>[]) {
  return { "@context": "https://schema.org", "@graph": nodes };
}