app/src/components/Hero.astro

---
import HtmlEmbed from "./HtmlEmbed.astro";
import Image from "./Image.astro";
import lerobotLogo from "../content/assets/image/figures/ch1/ch1-lerobot-figure1.png";

interface Props {
  title: string; // may contain HTML (e.g., <br/>)
  titleRaw?: string; // plain title for slug/PDF (optional)
  description?: string;
  authors?: Array<
    string | { name: string; url?: string; affiliationIndices?: number[] }
  >;
  affiliations?: Array<{ id: number; name: string; url?: string }>;
  affiliation?: string; // legacy single affiliation
  published?: string;
  doi?: string;
  pdfProOnly?: boolean; // Gate PDF download to Pro users only
}

const {
  title,
  titleRaw,
  description,
  authors = [],
  affiliations = [],
  affiliation,
  published,
  doi,
  pdfProOnly = false,
} = Astro.props as Props;

type Author = { name: string; url?: string; affiliationIndices?: number[] };

function normalizeAuthors(
  input: Array<
    | string
    | {
        name?: string;
        url?: string;
        link?: string;
        affiliationIndices?: number[];
        affiliations?: number[];
      }
  >,
): Author[] {
  return (Array.isArray(input) ? input : [])
    .map((a) => {
      if (typeof a === "string") {
        return { name: a } as Author;
      }
      const name = (a?.name ?? "").toString();
      const url = (a?.url ?? a?.link) as string | undefined;
      // Support both 'affiliationIndices' and 'affiliations' as property names
      const affiliationIndices = Array.isArray((a as any)?.affiliationIndices)
        ? (a as any).affiliationIndices
        : Array.isArray((a as any)?.affiliations)
        ? (a as any).affiliations
        : undefined;
      return { name, url, affiliationIndices } as Author;
    })
    .filter((a) => a.name && a.name.trim().length > 0);
}

const normalizedAuthors: Author[] = normalizeAuthors(authors as any);

// Determine if affiliation superscripts should be shown (only when there are multiple distinct affiliations referenced by authors)
const authorAffiliationIndexSet = new Set<number>();
for (const author of normalizedAuthors) {
  const indices = Array.isArray(author.affiliationIndices)
    ? author.affiliationIndices
    : [];
  for (const idx of indices) {
    if (typeof idx === "number") {
      authorAffiliationIndexSet.add(idx);
    }
  }
}
const hasMultipleAffiliations =
  Array.isArray(affiliations) && affiliations.length > 1;
const shouldShowAffiliationSupers = hasMultipleAffiliations && authorAffiliationIndexSet.size > 0;

function stripHtml(text: string): string {
  return String(text || "").replace(/<[^>]*>/g, "");
}

function slugify(text: string): string {
  return (
    String(text || "")
      .normalize("NFKD")
      .replace(/\p{Diacritic}+/gu, "")
      .toLowerCase()
      .replace(/[^a-z0-9]+/g, "-")
      .replace(/^-+|-+$/g, "")
      .slice(0, 120) || "article"
  );
}

const pdfBase = titleRaw ? stripHtml(titleRaw) : stripHtml(title);
const pdfFilename = `${slugify(pdfBase)}.pdf`;
---

<section class="hero">
  <h1 class="hero-title" set:html={title} />
  <!-- <div class="hero-banner">
    <HtmlEmbed src="banner.html" frameless />
    <Image 
      src={lerobotLogo} 
      alt="LeRobot Logo" 
    />
    {description && <p class="hero-desc">{description}</p>}
  </div> -->
</section>

<header class="meta" aria-label="Article meta information">
  <div class="meta-container">
    {
      normalizedAuthors.length > 0 && (
        <div class="meta-container-cell">
          <h3>Author{normalizedAuthors.length > 1 ? "s" : ""}</h3>
          <ul class="authors">
            {normalizedAuthors.map((a, i) => {
              const supers =
                shouldShowAffiliationSupers &&
                Array.isArray(a.affiliationIndices) &&
                a.affiliationIndices.length ? (
                  <sup>{a.affiliationIndices.join(", ")}</sup>
                ) : null;
              return (
                <li>
                  {a.url ? <a href={a.url}>{a.name}</a> : a.name}{supers}{i < normalizedAuthors.length - 1 && <span set:html=",&nbsp;" />}
                </li>
              );
            })}
          </ul>
        </div>
      )
    }
    {
      Array.isArray(affiliations) && affiliations.length > 0 && (
        <div class="meta-container-cell meta-container-cell--affiliations">
          <h3>Affiliation{affiliations.length > 1 ? "s" : ""}</h3>
          {hasMultipleAffiliations ? (
            <ol class="affiliations">
              {affiliations.map((af) => (
                <li value={af.id}>
                  {af.url ? (
                    <a href={af.url} target="_blank" rel="noopener noreferrer">
                      {af.name}
                    </a>
                  ) : (
                    af.name
                  )}
                </li>
              ))}
            </ol>
          ) : (
            <p>
              {affiliations[0]?.url ? (
                <a
                  href={affiliations[0].url}
                  target="_blank"
                  rel="noopener noreferrer"
                >
                  {affiliations[0].name}
                </a>
              ) : (
                affiliations[0]?.name
              )}
            </p>
          )}
        </div>
      )
    }
    {
      (!affiliations || affiliations.length === 0) && affiliation && (
        <div class="meta-container-cell meta-container-cell--affiliations">
          <h3>Affiliation</h3>
          <p>{affiliation}</p>
        </div>
      )
    }
    {
      published && (
        <div class="meta-container-cell meta-container-cell--published">
          <h3>Published</h3>
          <p>{published}</p>
        </div>
      )
    }
    <!-- {doi && (
      <div class="meta-container-cell">
        <h3>DOI</h3>
        <p><a href={`https://doi.org/${doi}`} target="_blank" rel="noopener noreferrer">{doi}</a></p>
      </div>
    )} -->
    <div class="meta-container-cell meta-container-cell--pdf">
      <div class="pdf-header-wrapper">
        <h3>PDF</h3>
        <span class="pro-badge-wrapper" style="display: none;">
          <span class="pro-badge-prefix">- you are</span>
          <span class="pro-badge">PRO</span>
        </span>
        <span class="pro-only-label" style="display: none;">
          <span class="pro-only-dash">-</span>
          <span class="pro-only-text">pro only</span>
          <svg class="pro-only-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect>
            <path d="M7 11V7a5 5 0 0 1 10 0v4"></path>
          </svg>
        </span>
      </div>
      <div id="pdf-download-container" data-pdf-pro-only={pdfProOnly.toString()}>
        <p class="pdf-loading">Checking access...</p>
        <p class="pdf-pro-only" style="display: none;">
          <a
            class="button"
            href={`http://arxiv.org/pdf/2510.12403`}
            target="_blank"
            rel="noopener noreferrer"
          >
            Download PDF
          </a>
        </p>
        <div class="pdf-locked" style="display: none;">
          <a 
            class="button button-locked" 
            href="https://huggingface.co/subscribe/pro"
            target="_blank"
            rel="noopener noreferrer"
          >
            <svg class="lock-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" role="img" width="1em" height="1em" viewBox="0 0 12 12" fill="none">
              <path d="M6.48 1.26c0 1.55.67 2.58 1.5 3.24.86.68 1.9 1 2.58 1.07v.86A5.3 5.3 0 0 0 7.99 7.5a3.95 3.95 0 0 0-1.51 3.24h-.96c0-1.55-.67-2.58-1.5-3.24a5.3 5.3 0 0 0-2.58-1.07v-.86A5.3 5.3 0 0 0 4.01 4.5a3.95 3.95 0 0 0 1.51-3.24h.96Z" fill="currentColor"></path>
            </svg>
            <span class="locked-title">Subscribe to Pro</span>
          </a>
        </div>
      </div>
    </div>
  </div>
</header>

<script>
  // PDF access control for Pro users only
  
  // ⚙️ Configuration for local development
  const LOCAL_IS_PRO = false; // Set to true to test Pro access locally
  
  const FALLBACK_TIMEOUT_MS = 3000;
  let userPlanChecked = false;

  // Check if PDF Pro gating is enabled
  const pdfContainer = document.querySelector("#pdf-download-container") as HTMLElement;
  const pdfProOnly = pdfContainer?.getAttribute("data-pdf-pro-only") === "true";

  /**
   * Check if user has Pro access
   * Isolated logic for Pro user verification
   * Expected plan structure: { user: "pro", org: "enterprise" }
   */
  function isProUser(plan: any): boolean {
    if (!plan) return false;
    
    // Check if user property is "pro"
    return plan.user === "pro";
  }

  /**
   * Update UI based on user's Pro status
   */
  function updatePdfAccess(isPro: boolean) {
    const loadingEl = document.querySelector(".pdf-loading") as HTMLElement;
    const proOnlyEl = document.querySelector(".pdf-pro-only") as HTMLElement;
    const lockedEl = document.querySelector(".pdf-locked") as HTMLElement;
    const proOnlyLabel = document.querySelector(".pro-only-label") as HTMLElement;
    const proBadgeWrapper = document.querySelector(".pro-badge-wrapper") as HTMLElement;
    
    // Hide loading state
    if (loadingEl) loadingEl.style.display = "none";
    
    // If PDF Pro gating is disabled, just show the download button
    if (!pdfProOnly) {
      if (proOnlyEl) proOnlyEl.style.display = "block";
      if (proOnlyLabel) proOnlyLabel.style.display = "none";
      if (lockedEl) lockedEl.style.display = "none";
      if (proBadgeWrapper) proBadgeWrapper.style.display = "none";
      return;
    }
    
    // Show appropriate state based on Pro status
    if (isPro) {
      if (proOnlyEl) proOnlyEl.style.display = "block";
      if (proOnlyLabel) proOnlyLabel.style.display = "none";
      if (lockedEl) lockedEl.style.display = "none";
      if (proBadgeWrapper) proBadgeWrapper.style.display = "inline-flex";
    } else {
      if (proOnlyEl) proOnlyEl.style.display = "none";
      if (proOnlyLabel) proOnlyLabel.style.display = "inline-flex";
      if (lockedEl) lockedEl.style.display = "block";
      if (proBadgeWrapper) proBadgeWrapper.style.display = "none";
    }
  }

  /**
   * Handle user plan response
   */
  function handleUserPlan(plan: any) {
    userPlanChecked = true;
    const isPro = isProUser(plan);
    updatePdfAccess(isPro);
    
    // Optional: log for debugging
    console.log("[PDF Access]", { plan, isPro });
  }

  /**
   * Fallback behavior when no parent window responds
   * Uses LOCAL_IS_PRO configuration for local development
   */
  function handleFallback() {
    if (LOCAL_IS_PRO) {
      handleUserPlan({ user: "pro" });
    } else {
      handleUserPlan({ user: "free" });
    }
  }

  // If PDF Pro gating is disabled, show the download button immediately
  if (!pdfProOnly) {
    updatePdfAccess(true);
  } else {
    // Listen for messages from parent window (Hugging Face Spaces)
    window.addEventListener("message", (event) => {
      if (event.data.type === "USER_PLAN") {
        handleUserPlan(event.data.plan);
      }
    });

    // Request user plan on page load
    if (window.parent && window.parent !== window) {
      // We're in an iframe, request user plan
      window.parent.postMessage({ type: "USER_PLAN_REQUEST" }, "*");
      
      // Fallback if no response after timeout
      setTimeout(() => {
        if (!userPlanChecked) {
          handleFallback();
        }
      }, FALLBACK_TIMEOUT_MS);
    } else {
      // Not in iframe (local development), use fallback immediately
      handleFallback();
    }
  }
</script>

<style>
  /* Hero (full-width) */
  .hero {
    width: 100%;
    padding: 48px 16px 16px;
    text-align: center;
  }
  .hero-title {
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 8px;
    max-width: 100%;
    margin: auto;
  }
  .hero-banner {
    max-width: 980px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 8px;
    margin-bottom: 8px;
    overflow: hidden;
  }
  .hero-banner .ri-root {
    border-radius: 8px;
  }
  .hero-desc {
    color: var(--muted-color);
    font-style: italic;
    margin: 0 0 16px 0;
  }

  /* Meta (byline-like header) */
  .meta {
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    font-size: 0.9rem;
  }
  .meta-container {
    max-width: 760px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin: 0 auto;
    padding: 0 var(--content-padding-x);
    gap: 8px;
  }
  /* Subtle underline for links in meta; keep buttons without underline */
  .meta-container a:not(.button) {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-thickness: 0.06em;
    text-decoration-color: var(--link-underline);
    transition: text-decoration-color 0.15s ease-in-out;
  }
  .meta-container a:hover {
    text-decoration-color: var(--link-underline-hover);
  }
  .meta-container a.button,
  .meta-container .button {
    text-decoration: none;
  }
  .meta-container-cell {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    min-width: 0;
  }
  .meta-container-cell h3 {
    margin: 0;
    font-size: 12px;
    font-weight: 400;
    color: var(--muted-color);
    text-transform: uppercase;
    letter-spacing: 0.02em;
  }
  .meta-container-cell p {
    margin: 0;
  }
  .authors {
    margin: 0;
    list-style-type: none;
    padding-left: 0;
    display: flex;
    flex-wrap: wrap;
  }
  .authors li {
    white-space: nowrap;
    padding:0;
  }
  .affiliations {
    margin: 0;
    padding-left: 1.25em;
  }
  .affiliations li {
    margin: 0;
  }

  header.meta .meta-container {
    flex-wrap: wrap;
    row-gap: 12px;
  }

  @media (max-width: 768px) {
    .meta-container-cell--affiliations,
    .meta-container-cell--pdf {
      text-align: right;
    }
  }

  @media print {
    .meta-container-cell--pdf {
      display: none !important;
    }
  }

  /* PDF access control styles */
  .pdf-header-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    line-height: 1;
  }

  .pdf-header-wrapper h3 {
    line-height: 1;
  }

  .pdf-loading {
    color: var(--muted-color);
    font-size: 0.9em;
  }

  .pdf-pro-only {
    margin: 0;
  }

  .pro-badge-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-style: normal;
  }

  .pro-badge-prefix {
    font-size: 0.85em;
    opacity: 0.5;
    font-weight: 400;
    font-style: normal;
  }

  .pro-badge {
    display: inline-block;
    border: 1px solid rgba(0, 0, 0, 0.025);
    background: linear-gradient(to bottom right, #f9a8d4, #86efac, #fde047);
    color: black;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.5rem;
    font-weight: 700;
    font-style: normal;
    letter-spacing: 0.025em;
    text-transform: uppercase;
  }

  /* Dark mode pro badge */
  :global(.dark) .pro-badge,
  :global([data-theme="dark"]) .pro-badge {
    background: linear-gradient(to bottom right, #ec4899, #22c55e, #eab308);
    border-color: rgba(255, 255, 255, 0.15);
  }

  .pro-only-label {
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    gap: 5px;
    font-size: 0.85em;
    opacity: 0.5;
    font-weight: 400;
    line-height: 1;
  }

  .pro-only-dash {
    display: inline-flex;
    align-items: center;
    line-height: 1;
  }

  .pro-only-icon {
    width: 11px;
    height: 11px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
  }

  .pro-only-text {
    display: inline-flex;
    align-items: center;
    line-height: 1;
  }

  .pdf-locked {
    display: block;
  }

  .button-locked {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, 
                  var(--primary-color) 0%, 
                  oklch(from var(--primary-color) calc(l - 0.1) calc(c + 0.05) calc(h - 60)) 100%);
    border-radius: var(--button-radius);
    padding: var(--button-padding-y) var(--button-padding-x);
    font-size: var(--button-font-size);
    line-height: 1;
    color: var(--on-primary);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: normal;
    border-color: rgba(0, 0, 0, 0.15);
  }

  .button-locked:active {
    transform: translateY(0);
  }

  .lock-icon {
    font-size: 1em;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
  }

  .locked-title {
    position: relative;
    z-index: 1;
  }

  /* Dark mode locked button - inherits from light mode variables */

  @media (max-width: 768px) {
    .meta-container-cell--pdf {
      display: flex;
      flex-direction: column;
      align-items: flex-end;
    }
  }
</style>