export function extractTextSnippet(source: string, maxChars = 220): string {
  const strippedHtml = source
    .replace(/<script[\s\S]*?>[\s\S]*?<\/script>/gi, ' ')
    .replace(/<style[\s\S]*?>[\s\S]*?<\/style>/gi, ' ')
    .replace(/<[^>]+>/g, ' ');

  const normalizedMarkdown = strippedHtml
    .replace(/```[\s\S]*?```/g, ' ')
    .replace(/`[^`]+`/g, ' ')
    .replace(/!\[[^\]]*?\]\([^)]+\)/g, ' ')
    .replace(/\[([^\]]+)\]\([^)]+\)/g, '$1')
    .replace(/[#>*_~]/g, ' ');

  const normalized = normalizedMarkdown
    .replace(/\r\n/g, '\n')
    .replace(/\n{3,}/g, '\n\n')
    .replace(/[ \t]{2,}/g, ' ')
    .trim();

  const paragraphs = normalized
    .split(/\n\s*\n/)
    .map((p) => p.trim())
    .filter(Boolean);
  const first = paragraphs[0] ?? normalized;

  if (first.length <= maxChars) return first;
  return `${first.slice(0, Math.max(0, maxChars - 1)).trimEnd()}…`;
}

export function extractRawTextSnippet(source: string, maxChars = 1600): string {
  const strippedHtml = source
    .replace(/<script[\s\S]*?>[\s\S]*?<\/script>/gi, '')
    .replace(/<style[\s\S]*?>[\s\S]*?<\/style>/gi, '');

  const normalized = strippedHtml.replace(/\r\n/g, '\n').trim();

  if (normalized.length <= maxChars) return normalized;
  return `${normalized.slice(0, Math.max(0, maxChars - 1)).trimEnd()}…`;
}