import { readFile } from "node:fs/promises";
import path from "node:path";

export async function readWorkspaceFile(filePath: string, cwd: string) {
  const resolved = path.resolve(cwd, filePath);
  const relative = path.relative(cwd, resolved);

  if (relative.startsWith("..") || path.isAbsolute(relative)) {
    throw new Error(`--body-file must stay within the active workspace: ${filePath}`);
  }

  return readFile(resolved, "utf8");
}