/** Parse a GitHub remote in HTTPS, SSH URL, or scp-like form. */
export function parseGitHubRemoteUrl(raw: string): { owner: string; repo: string } | null {
  const trimmed = raw.trim();
  let path: string | undefined;
  const scpMatch = /^git@github\.com:(.+)$/i.exec(trimmed);
  if (scpMatch) {
    path = scpMatch[1];
  } else {
    try {
      const url = new URL(trimmed);
      const protocolOk =
        url.protocol === "https:" || url.protocol === "http:" || url.protocol === "ssh:";
      if (!protocolOk || url.hostname.toLowerCase() !== "github.com") {
        return null;
      }
      path = url.pathname;
    } catch {
      return null;
    }
  }
  const segments = (path ?? "").split("/").filter(Boolean);
  const owner = segments[0];
  const repo = segments[1]?.replace(/\.git$/i, "");
  if (segments.length !== 2 || !owner || !repo) {
    return null;
  }
  return { owner, repo };
}