const BaseUrl = "https://downloader.lionwebsite.xyz/";

// Remote galleries carry a raw thumbnail path; it only resolves through the
// backend proxy once the active auth code is attached.
export function ehThumbnailUrl(path, AuthCode) {
  if (!path) return "";
  return BaseUrl + "GalleryManage/ehThumbnail?" + new URLSearchParams({path, AuthCode}).toString();
}

const UNIT_SCALE = {b: 1, k: 1024, m: 1024 ** 2, g: 1024 ** 3, t: 1024 ** 4};

function sizeInBytes(text) {
  const match = String(text).match(/([\d.]+)\s*([kmgt]?)(?:i?b)/i);
  if (!match) return 0;
  const scale = UNIT_SCALE[match[2].toLowerCase()] ?? 1;
  return Number(match[1]) * scale;
}

// Prefer the original file; otherwise take whichever entry reports the most bytes.
export function pickDefaultResolution(availableResolution) {
  const entries = Object.entries(availableResolution || {});
  if (entries.length === 0) return "";
  const original = entries.find(([resolution]) => /original/i.test(resolution));
  if (original) return original[0];
  return entries.reduce((best, current) =>
    sizeInBytes(current[1]) > sizeInBytes(best[1]) ? current : best)[0];
}