export function normalizeSourceUrl(input: string): string {
  const trimmed = input.trim();
  if (!trimmed) return trimmed;

  try {
    const url = new URL(trimmed);
    if (url.hostname === "gist.github.com") {
      const [user, gistId] = url.pathname.split("/").filter(Boolean);
      if (user && gistId) {
        return `https://gist.githubusercontent.com/${user}/${gistId}/raw`;
      }
    }
    if (url.hostname === "gist.githubusercontent.com" && url.pathname.includes("/raw")) {
      return trimmed;
    }
    return trimmed;
  } catch {
    return trimmed;
  }
}

export function isProbablyUrl(input: string): boolean {
  return /^(https?:\/\/|at:\/\/)/i.test(input.trim());
}