// hook-helper.mjs — Shared test helper for hook scripts.
// Spawns a hook as a child process and feeds it JSON via stdin.

import { execFile } from 'node:child_process';

/**
 * Run a hook script by spawning `node <scriptPath>` and piping `input` to stdin.
 *
 * @param {string} scriptPath - Absolute path to the hook .mjs file
 * @param {object|string} input - JSON payload (object will be stringified)
 * @returns {Promise<{ code: number, stdout: string, stderr: string }>}
 */
export function runHook(scriptPath, input) {
  return runHookWithEnv(scriptPath, input, {});
}

/**
 * Run a hook script with custom environment variables.
 *
 * @param {string} scriptPath - Absolute path to the hook .mjs file
 * @param {object|string} input - JSON payload (object will be stringified)
 * @param {Record<string, string>} envOverrides - Extra env vars to set
 * @returns {Promise<{ code: number, stdout: string, stderr: string }>}
 */
export function runHookWithEnv(scriptPath, input, envOverrides) {
  return new Promise((resolve) => {
    const env = { ...process.env, ...envOverrides };
    const child = execFile(
      'node',
      [scriptPath],
      { timeout: 5000, env },
      (err, stdout, stderr) => {
        resolve({
          code: child.exitCode ?? (err && err.code === 'ERR_CHILD_PROCESS_STDIO_FINAL' ? 0 : 1),
          stdout: stdout || '',
          stderr: stderr || '',
        });
      }
    );
    child.stdin.end(typeof input === 'string' ? input : JSON.stringify(input));
  });
}