/**
 * Small helper for permissive imports (goView / low-code exports).
 *
 * Many widgets store their URL-ish source in slightly different shapes:
 * - string
 * - { value: string }
 * - { url: string }
 * - { src: string }
 * - { dataset: string | { value/url/src } }
 * - nested objects under `data` / `config` / `options`
 */
export function pickUrlLike(input: unknown, maxDepth = 3): string {
  return pickUrlLikeInner(input, maxDepth);
}

function pickUrlLikeInner(input: unknown, depth: number): string {
  if (typeof input === 'string') return input;
  if (!input) return '';

  if (Array.isArray(input)) {
    for (const item of input) {
      const v = pickUrlLikeInner(item, depth - 1);
      if (v) return v;
    }
    return '';
  }

  if (typeof input !== 'object') return '';

  const obj = input as Record<string, unknown>;

  // Common direct keys.
  // Keep this list generous; imports come from many low-code editors.
  for (const key of [
    'value',
    'url',
    'src',
    'href',
    'link',
    'path',
    'source',
    'address',
    // iframe-ish
    'iframeUrl',
    'iframeSrc',
    'embedUrl',
    // video-ish
    'videoUrl',
    'videoSrc',
    'mp4',
    'm3u8',
    'flv',
    // other streaming-ish keys
    'hls',
    'hlsUrl',
    'stream',
    'streamUrl',
    'rtsp',
    'rtspUrl',
  ]) {
    const v = obj[key];
    if (typeof v === 'string' && v) return v;
  }

  if (depth <= 0) return '';

  // Common nesting keys.
  for (const key of ['dataset', 'data', 'config', 'option', 'options', 'props', 'source', 'media']) {
    const v = obj[key];
    const nested = pickUrlLikeInner(v, depth - 1);
    if (nested) return nested;
  }

  return '';
}