mariosant.dev/src/utils/seo.ts

import type { CollectionEntry } from "astro:content";
import type { ImageMetadata } from "astro:assets";

export const SITE_URL = "https://mariosant.dev";
export const TWITTER_HANDLE = "@marios_ant";
export const AUTHOR_NAME = "Marios Antonoudiou";
export const AUTHOR_JOB_TITLE = "AI Product Engineer";

export const SOCIALS = {
  github: "https://github.com/mariosant",
  linkedin: "https://www.linkedin.com/in/mariosant/",
  bluesky: "https://bsky.app/profile/mariosant.bsky.social",
  email: "mailto:mariosant@sent.com",
  calendar: "https://cal.com/mariosant/30min",
} as const;

export const PERSON_ID = `${SITE_URL}/#person`;
export const AUTHOR_DESCRIPTION =
  "AI product engineer building AI-powered products that feel simple, useful, and ready for real users.";

export const stripMarkdown = (body: string): string =>
  body
    .replace(/```[\s\S]*?```/g, " ")
    .replace(/`[^`]*`/g, " ")
    .replace(/^#{1,6}\s+.*$/gm, "")
    .replace(/\[([^\]]+)\]\([^)]+\)/g, "$1")
    .replace(/!\[[^\]]*\]\([^)]+\)/g, "")
    .replace(/^>\s*/gm, "")
    .replace(/^\s*[-*+]\s+/gm, "")
    .replace(/^\s*\d+\.\s+/gm, "")
    .replace(/[*_~]+/g, "")
    .replace(/\s+/g, " ")
    .trim();

export const deriveDescription = (body: string, max = 155): string => {
  const plain = stripMarkdown(body);
  if (plain.length <= max) return plain;
  const cut = plain.slice(0, max);
  const lastSpace = cut.lastIndexOf(" ");
  const safeCut = lastSpace > 80 ? cut.slice(0, lastSpace) : cut;
  return `${safeCut.trimEnd()}…`;
};

type ArticleEntry = CollectionEntry<"articles">;

export const imageSrc = (img: ImageMetadata | string): string =>
  typeof img === "string" ? img : img.src;

export const personJsonLd = (): string =>
  JSON.stringify({
    "@context": "https://schema.org",
    "@type": "Person",
    "@id": PERSON_ID,
    name: AUTHOR_NAME,
    jobTitle: AUTHOR_JOB_TITLE,
    url: SITE_URL,
    image: `${SITE_URL}/mariosant.webp`,
    description: AUTHOR_DESCRIPTION,
    sameAs: [SOCIALS.github, SOCIALS.linkedin, SOCIALS.bluesky],
  });

export const articleJsonLd = (entry: ArticleEntry): string => {
  const description = entry.data.description ?? deriveDescription(entry.body ?? "");
  return JSON.stringify({
    "@context": "https://schema.org",
    "@type": "Article",
    headline: entry.data.title,
    description,
    image: imageSrc(entry.data.coverImage.url),
    datePublished: entry.data.date.toISOString(),
    author: {
      "@id": PERSON_ID,
      "@type": "Person",
      name: AUTHOR_NAME,
    },
    publisher: {
      "@id": PERSON_ID,
      "@type": "Person",
      name: AUTHOR_NAME,
    },
    mainEntityOfPage: {
      "@type": "WebPage",
      "@id": `${SITE_URL}/articles/${entry.id}`,
    },
  });
};

export const breadcrumbJsonLd = (entry: ArticleEntry): string =>
  JSON.stringify({
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    itemListElement: [
      {
        "@type": "ListItem",
        position: 1,
        name: "Home",
        item: SITE_URL,
      },
      {
        "@type": "ListItem",
        position: 2,
        name: "Articles",
        item: `${SITE_URL}/articles`,
      },
      {
        "@type": "ListItem",
        position: 3,
        name: entry.data.title,
        item: `${SITE_URL}/articles/${entry.id}`,
      },
    ],
  });

export const articleListJsonLd = (entries: readonly ArticleEntry[]): string =>
  JSON.stringify({
    "@context": "https://schema.org",
    "@type": "ItemList",
    name: "Articles by Marios Antonoudiou",
    itemListElement: entries.map((entry, index) => ({
      "@type": "ListItem",
      position: index + 1,
      url: `${SITE_URL}/articles/${entry.id}`,
      name: entry.data.title,
    })),
  });

export const renderJsonLd = (data: unknown): string => {
  if (Array.isArray(data)) {
    return data.map((item) => JSON.stringify(item)).join("\n");
  }
  return JSON.stringify(data);
};