import type { StartStep } from "@uncaged/nerve-core";

type StartMetaWithWorkdir = StartStep["meta"] & { workdir?: string | null };

/**
 * Resolve the target repo working directory.
 * Priority: start.meta.workdir → prompt second line (if absolute path) → cwd.
 */
export function resolveWorkdir(start: StartStep): string {
  const m = start.meta as StartMetaWithWorkdir;
  if (m.workdir) return m.workdir;

  // Allow prompt to carry workdir on the second line: "seed\n/abs/path"
  const lines = start.content.split(/\r?\n/);
  if (lines.length >= 2) {
    const candidate = lines[1]!.trim();
    if (candidate.startsWith("/")) return candidate;
  }

  return process.cwd();
}