// 每次运行把样例仓库复制一份，初始化成 git 仓库，方便看 diff。
import { cpSync, mkdirSync, rmSync } from 'node:fs';
import { execFileSync } from 'node:child_process';
import { join } from 'node:path';
import { PROJECT_ROOT } from './config.ts';

export const FIXTURE = join(PROJECT_ROOT, 'fixture', 'order-service');
export const RUNS_DIR = join(PROJECT_ROOT, '.runs');

export function prepareWorkspace(runId: string): string {
  const dir = join(RUNS_DIR, runId, 'order-service');
  rmSync(dir, { recursive: true, force: true });
  mkdirSync(dir, { recursive: true });
  cpSync(FIXTURE, dir, { recursive: true });
  const git = (...args: string[]) => execFileSync('git', args, { cwd: dir, stdio: 'ignore' });
  git('init', '-q', '-b', 'main');
  git('add', '-A');
  git('-c', 'user.name=demo', '-c', 'user.email=demo@example.com', 'commit', '-qm', 'baseline');
  return dir;
}

export function workspaceDiff(dir: string): string {
  try {
    execFileSync('git', ['add', '-A', '-N'], { cwd: dir, stdio: 'ignore' });
    return execFileSync('git', ['diff', '--no-color'], { cwd: dir, encoding: 'utf8' });
  } catch {
    return '';
  }
}