import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const DEFAULT_CONFIG_NAME = "triggershell.yml";

/** Root of the installed `triggershell` package - one level up from `src/cli/lib`. */
export function resolveAppRoot(): string {
  return path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..", "..");
}

export function resolveConfigPath(configArg?: string): string {
  return path.resolve(process.cwd(), configArg ?? DEFAULT_CONFIG_NAME);
}

/**
 * Absolute path to the script that was actually invoked (`node <this>`), with any symlink
 * (as created by a global npm/pnpm install or `npm link`) resolved away. Used to build a
 * `systemd` `ExecStart` line that keeps working regardless of how the CLI was installed.
 */
export function resolveInvokedBinPath(): string {
  return fs.realpathSync(process.argv[1]);
}