import { readFileSync } from "node:fs";
import { join } from "node:path";

/**
 * The installed package version, read from the package manifest once per run.
 * The path is one level deeper than cli.ts's original — this module lives in
 * src/commands/ — but resolves to the same omp/package.json.
 */
function packageVersion(): string {
  const parsed = JSON.parse(
    readFileSync(join(import.meta.dir, "..", "..", "package.json"), "utf8"),
  ) as {
    version?: unknown;
  };
  if (typeof parsed.version !== "string" || parsed.version.length === 0) {
    throw new Error("installed package.json has no version");
  }
  return parsed.version;
}

/**
 * `--version`, `-V` and `version`: print the installed package version.
 *
 * Moved out of cli.ts's switch by the per-verb module split (#462); only the
 * case wrapper and the imports changed from the original body.
 */

export async function versionCommand(): Promise<void> {
  process.stdout.write(`${packageVersion()}\n`);
}