---
import HtmlEmbed from "./HtmlEmbed.astro";

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;
}

const { title, titleRaw, description, authors = [], affiliations = [], affiliation, published, doi } = 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[] }>): 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;
      const affiliationIndices = Array.isArray((a as any)?.affiliationIndices) ? (a as any).affiliationIndices : 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 shouldShowAffiliationSupers = authorAffiliationIndexSet.size > 1;
const hasMultipleAffiliations = Array.isArray(affiliations) && affiliations.length > 1;

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}></h1>
  <div class="hero-banner">
    <HtmlEmbed src="banner.html" frameless />
    {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}
              </li>
            );
          })}
        </ul>
      </div>
    )}
    {(Array.isArray(affiliations) && affiliations.length > 0) && (
      <div class="meta-container-cell">
        <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">
        <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/${doi}`} target="_blank" rel="noopener noreferrer">{doi}</a></p>
      </div>
    )} -->
    <div class="meta-container-cell meta-container-cell--pdf">
      <h3>PDF</h3>
      <p>
        <a class="button" href={`/${pdfFilename}`} download={pdfFilename} aria-label={`Download PDF ${pdfFilename}`}>
          Download PDF
        </a>
      </p>
    </div>
  </div>
</header>


<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;
  }
  .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 {
    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 .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;
  }
  .meta-container-cell h3 {
    margin: 0;
    font-size: 12px;
    font-weight: 400;
    color: var(--muted-color);
    text-transform: uppercase;
    letter-spacing: .02em;
  }
  .meta-container-cell p {
    margin: 0;
  } 
  .authors {
    margin: 0;
    list-style-type: none;
    padding-left: 0;
  }
  .affiliations {
    margin: 0;
    padding-left: 1.25em;
  }
  .affiliations li {
    margin: 0;
  }

  header.meta .meta-container {
    flex-wrap: wrap;
    row-gap: 12px;
  }
  
  @media print {
    .meta-container-cell--pdf {
      display: none !important;
    }
  }
</style>