app/src/pages/index.astro

---
import * as ArticleMod from "../content/article.mdx";

import Hero from "../components/Hero.astro";
import Footer from "../components/Footer.astro";
import ThemeToggle from "../components/ThemeToggle.astro";
import Seo from "../components/Seo.astro";
import TableOfContents from "../components/TableOfContents.astro";
// Default OG image served from public/
const ogDefaultUrl = "/thumb.auto.jpg";
import "katex/dist/katex.min.css";
import "../styles/global.css";
const articleFM = (ArticleMod as any).frontmatter ?? {};
const Article = (ArticleMod as any).default;
const docTitle = articleFM?.title ?? "Untitled article";
// Allow explicit line breaks in the title via "\n" or YAML newlines
const docTitleHtml = (articleFM?.title ?? "Untitled article")
  .replace(/\\n/g, "<br/>")
  .replace(/\n/g, "<br/>");
const subtitle = articleFM?.subtitle ?? "";
const description = articleFM?.description ?? "";
// Accept authors as string[] or array of objects { name, url, affiliations? }
const rawAuthors = (articleFM as any)?.authors ?? [];
type Affiliation = { id: number; name: string; url?: string };
type Author = { name: string; url?: string; affiliationIndices?: number[] };

// Normalize affiliations from frontmatter: supports strings or objects { id?, name, url? }
const rawAffils =
  (articleFM as any)?.affiliations ?? (articleFM as any)?.affiliation ?? [];
const normalizedAffiliations: Affiliation[] = (() => {
  const seen: Map<string, number> = new Map();
  const list: Affiliation[] = [];
  const pushUnique = (name: string, url?: string) => {
    const key = `${String(name).trim()}|${url ? String(url).trim() : ""}`;
    if (seen.has(key)) return seen.get(key)!;
    const id = list.length + 1;
    list.push({
      id,
      name: String(name).trim(),
      url: url ? String(url) : undefined,
    });
    seen.set(key, id);
    return id;
  };
  const input = Array.isArray(rawAffils)
    ? rawAffils
    : rawAffils
      ? [rawAffils]
      : [];
  for (const a of input) {
    if (typeof a === "string") {
      pushUnique(a);
    } else if (a && typeof a === "object") {
      const name = a.name ?? a.label ?? a.text ?? a.affiliation ?? "";
      if (!String(name).trim()) continue;
      const url = a.url || a.link;
      // Respect provided numeric id for display stability if present and sequential; otherwise reassign
      pushUnique(String(name), url ? String(url) : undefined);
    }
  }
  return list;
})();

// Helper: ensure an affiliation exists and return its id
const ensureAffiliation = (val: any): number | undefined => {
  if (val == null) return undefined;
  if (typeof val === "number" && Number.isFinite(val) && val > 0) {
    return Math.floor(val);
  }
  const name =
    typeof val === "string"
      ? val
      : (val?.name ?? val?.label ?? val?.text ?? val?.affiliation);
  if (!name || !String(name).trim()) return undefined;
  const existing = normalizedAffiliations.find(
    (a) => a.name === String(name).trim(),
  );
  if (existing) return existing.id;
  const id = normalizedAffiliations.length + 1;
  normalizedAffiliations.push({
    id,
    name: String(name).trim(),
    url: val?.url || val?.link,
  });
  return id;
};

// Normalize authors and map affiliations -> indices (Distill-like)
const normalizedAuthors: Author[] = (
  Array.isArray(rawAuthors) ? rawAuthors : []
)
  .map((a: any) => {
    if (typeof a === "string") {
      return { name: a } as Author;
    }
    const name = String(a?.name || "").trim();
    const url = a?.url || a?.link;
    let indices: number[] | undefined = undefined;
    const raw = a?.affiliations ?? a?.affiliation ?? a?.affils;
    if (raw != null) {
      const entries = Array.isArray(raw) ? raw : [raw];
      const ids = entries
        .map(ensureAffiliation)
        .filter((x): x is number => typeof x === "number");
      const unique = Array.from(new Set(ids)).sort((x, y) => x - y);
      if (unique.length) indices = unique;
    }
    return { name, url, affiliationIndices: indices } as Author;
  })
  .filter((a: Author) => a.name && a.name.trim().length > 0);
const authorNames: string[] = normalizedAuthors.map((a) => a.name);
const published = articleFM?.published ?? undefined;
const tags = articleFM?.tags ?? [];
// Prefer seoThumbImage from frontmatter if provided
const fmOg = articleFM?.seoThumbImage as string | undefined;
const imageAbs: string =
  fmOg && fmOg.startsWith("http")
    ? fmOg
    : Astro.site
      ? new URL(fmOg ?? ogDefaultUrl, Astro.site).toString()
      : (fmOg ?? ogDefaultUrl);

// ---- Build citation text & BibTeX from frontmatter ----
const stripHtml = (text: string) => String(text || "").replace(/<[^>]*>/g, "");
const rawTitle = articleFM?.title ?? "Untitled article";
const titleFlat = stripHtml(String(rawTitle))
  .replace(/\\n/g, " ")
  .replace(/\n/g, " ")
  .replace(/\s+/g, " ")
  .trim();
const extractYear = (val: string | undefined): number | undefined => {
  if (!val) return undefined;
  const d = new Date(val);
  if (!Number.isNaN(d.getTime())) return d.getFullYear();
  const m = String(val).match(/(19|20)\d{2}/);
  return m ? Number(m[0]) : undefined;
};

const year = extractYear(published);
const citationAuthorsText = authorNames.join(", ");
const citationText = `${citationAuthorsText}${year ? ` (${year})` : ""}. "${titleFlat}".`;

const authorsBib = authorNames.join(" and ");
const keyAuthor = (authorNames[0] || "article")
  .split(/\s+/)
  .slice(-1)[0]
  .toLowerCase();
const keyTitle = titleFlat
  .toLowerCase()
  .replace(/[^a-z0-9]+/g, "_")
  .replace(/^_|_$/g, "")
  .slice(0, 24);
const bibKey = `${keyAuthor}${year ?? ""}_${keyTitle}`;
const doi = (ArticleMod as any)?.frontmatter?.doi
  ? String((ArticleMod as any).frontmatter.doi)
  : undefined;
const bibtex = `@misc{${bibKey},\n  title={${titleFlat}},\n  author={${authorsBib}},\n  ${year ? `year={${year}},\n  ` : ""}${doi ? `doi={${doi}}` : ""}\n}`;
const envCollapse = false;
const tableOfContentAutoCollapse = Boolean(
  (articleFM as any)?.tableOfContentAutoCollapse ??
    (articleFM as any)?.tableOfContentsAutoCollapse ??
    envCollapse,
);
// Licence note (HTML allowed)
const licence =
  (articleFM as any)?.licence ??
  (articleFM as any)?.license ??
  (articleFM as any)?.licenseNote;
---

<html
  lang="en"
  data-theme="light"
  data-toc-auto-collapse={tableOfContentAutoCollapse ? "1" : "0"}
>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <Seo
      title={docTitle}
      description={description}
      authors={authorNames}
      published={published}
      tags={tags}
      image={imageAbs}
    />
    <script is:inline>
      (() => {
        try {
          const saved = localStorage.getItem("theme");
          const prefersDark =
            window.matchMedia &&
            window.matchMedia("(prefers-color-scheme: dark)").matches;
          const theme = saved || (prefersDark ? "dark" : "light");
          document.documentElement.setAttribute("data-theme", theme);
        } catch {}
      })();
    </script>
    <script type="module" src="/scripts/color-palettes.js"></script>

    <!-- TO MANAGE PROPERLY -->
    <script src="https://cdn.plot.ly/plotly-3.0.0.min.js" charset="utf-8"
    ></script>
    <script src="https://cdn.jsdelivr.net/npm/d3@7/dist/d3.min.js"></script>
    <script
      src="https://cdn.jsdelivr.net/npm/medium-zoom@1.1.0/dist/medium-zoom.min.js"
    ></script>
    <script>
      // Debug and global zoom initialization

      function initializeZoom() {
        const zoomableImages = document.querySelectorAll(
          'img[data-zoomable="1"]',
        );

        if (window.mediumZoom && zoomableImages.length > 0) {
          zoomableImages.forEach((img, index) => {
            // Check if already initialized
            if (!img.classList.contains("medium-zoom-image")) {
              try {
                const instance = window.mediumZoom(img, {
                  background: "rgba(0,0,0,.85)",
                  margin: 24,
                  scrollOffset: 0,
                });
              } catch (error) {
                console.error(
                  `Global script: Error initializing zoom for image ${index}:`,
                  error,
                );
              }
            } else {
              console.log(`Global script: Image ${index} already has zoom`);
            }
          });
        } else {
          console.log(
            "Global script: mediumZoom not available or no images found",
          );
        }
      }

      // Try to initialize immediately
      if (document.readyState === "loading") {
        document.addEventListener("DOMContentLoaded", initializeZoom);
      } else {
        initializeZoom();
      }

      // Also try after complete loading
      window.addEventListener("load", () => {
        setTimeout(initializeZoom, 100);
      });
    </script>
  </head>
  <body>
    <ThemeToggle />
    <Hero
      title={docTitleHtml}
      titleRaw={docTitle}
      description={subtitle}
      authors={normalizedAuthors as any}
      affiliations={normalizedAffiliations as any}
      affiliation={articleFM?.affiliation}
      published={articleFM?.published}
      doi={doi}
      pdfProOnly={articleFM?.pdfProOnly}
    />

    <section class="content-grid">
      <TableOfContents
        tableOfContentAutoCollapse={tableOfContentAutoCollapse}
      />
      <main>
        <Article />
      </main>
    </section>

    <Footer
      citationText={citationText}
      bibtex={bibtex}
      licence={licence}
      doi={doi}
    />

    <script>
      // Open external links in a new tab; keep internal anchors in-page
      const setExternalTargets = () => {
        const isExternal = (href) => {
          try {
            const u = new URL(href, location.href);
            return u.origin !== location.origin;
          } catch {
            return false;
          }
        };
        document.querySelectorAll("a[href]").forEach((a) => {
          const href = a.getAttribute("href");
          if (!href) return;
          if (isExternal(href)) {
            a.setAttribute("target", "_blank");
            a.setAttribute("rel", "noopener noreferrer");
          } else {
            a.removeAttribute("target");
          }
        });
      };
      if (document.readyState === "loading") {
        document.addEventListener("DOMContentLoaded", setExternalTargets, {
          once: true,
        });
      } else {
        setExternalTargets();
      }
    </script>

    <script>
      // Delegate copy clicks for code blocks injected by rehypeCodeCopy
      document.addEventListener("click", async (e) => {
        const target = e.target instanceof Element ? e.target : null;
        const btn = target ? target.closest(".code-copy") : null;
        if (!btn) return;
        const card = btn.closest(".code-card");
        const pre = card && card.querySelector("pre");
        if (!pre) return;
        const text = pre.textContent || "";
        try {
          await navigator.clipboard.writeText(text.trim());
          const old = btn.innerHTML;
          btn.innerHTML =
            '<svg viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M9 16.2l-3.5-3.5-1.4 1.4L9 19 20.3 7.7l-1.4-1.4z"/></svg>';
          setTimeout(() => (btn.innerHTML = old), 1200);
        } catch {
          btn.textContent = "Error";
          setTimeout(() => (btn.textContent = "Copy"), 1200);
        }
      });
    </script>
  </body>
</html>