/**
 * Frontmatter, wiki links, and wiki image embeds (Docs-Viewer compatible).
 */

export function extractMetadata(content) {
  const lines = String(content || "").trim().split("\n");
  let metadata = {};
  let contentStart = 0;

  if (lines[0]?.trim() === "---") {
    const endMetadata = lines.findIndex((line, index) => index > 0 && line.trim() === "---");
    if (endMetadata !== -1) {
      const entries = lines
        .slice(1, endMetadata)
        .map((line) => line.match(/^([\w-]+):\s*(.*)$/))
        .filter(Boolean)
        .map(([, key, value]) => {
          if (key === "defaultOpen") {
            return [key, value.trim().toLowerCase() === "true"];
          }
          if (key === "sort") return [key, parseInt(value.trim(), 10)];
          return [key, value.trim()];
        });
      metadata = Object.fromEntries(entries);
      contentStart = endMetadata + 1;
    }
  }

  return {
    metadata,
    content: lines.slice(contentStart).join("\n").trim(),
  };
}

export function ensureTitle(content, title) {
  const stripped = String(content || "")
    .replace(/^#\s+.*$/m, "")
    .trim();
  return `# ${title}\n\n${stripped}`;
}

export function processWikiLinks(content, indexService, documents) {
  return String(content || "").replace(/\[\[(.*?)\]\]/g, (match, linkText) => {
    const [targetTitle, displayText] = linkText.split("|").map((s) => s.trim());
    if (/\.(png|jpg|jpeg|gif|webp|mp4|webm)$/i.test(targetTitle)) return match;
    const doc = indexService.findDocumentByTitle(documents, targetTitle);
    if (!doc) return match;
    return `[${displayText || doc.title}](?${doc.slug})`;
  });
}

export function processImages(content, _basePath) {
  return String(content || "").replace(/!\[\[(.*?)\]\]/g, (match, filename) => {
    const mediaPath = `./docs/images/${filename}`;
    if (filename.toLowerCase().endsWith(".mp4") || filename.toLowerCase().endsWith(".webm")) {
      return `\n\n<video src="${mediaPath}" controls playsinline></video>\n\n`;
    }
    return `\n\n![${filename}](${mediaPath})\n\n`;
  });
}