import { spawnSync } from 'child_process';
import { GITEA_SERVER_URL, GITEA_REPOSITORY, GITEA_TOKEN, PR_HEAD_BRANCH, FINDINGS_PATH } from './config.js';

function git(args, cwd) {
  const result = spawnSync('git', args, { cwd, encoding: 'utf8' });
  if (result.error) throw result.error;
  if (result.status !== 0) throw new Error(result.stderr || result.stdout);
  return (result.stdout || '').trim();
}

/**
 * Commit findings.json 並 push 到 PR 來源分支
 */
export function commitAndPush(workspace) {
  const repoDir = `${workspace}/${GITEA_REPOSITORY}`;
  const remoteUrl = GITEA_SERVER_URL.replace(/\/$/, '').replace('https://', `https://${GITEA_TOKEN}@`) + `/${GITEA_REPOSITORY}.git`;

  try {
    git(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);
    git(['config', 'user.name', 'AI Review Bot'], repoDir);
    git(['fetch', 'origin', PR_HEAD_BRANCH], repoDir);
    git(['checkout', PR_HEAD_BRANCH], repoDir);
    git(['add', FINDINGS_PATH], repoDir);

    const status = git(['status', '--porcelain'], repoDir);
    if (!status) {
      console.log('  findings.json 無變更，跳過 commit');
      return;
    }

    const out = git(['commit', '-m', 'chore: update ai-review findings [skip ci]'], repoDir);
    const commitHash = out.match(/\[.+ ([a-f0-9]+)\]/)?.[1] || 'unknown';
    git(['push', remoteUrl, PR_HEAD_BRANCH], repoDir);
    console.log(`  ✅ persisted findings  commit=${commitHash}  push=${PR_HEAD_BRANCH}`);
  } catch (e) {
    console.log(`  ⚠️  Runner failed: commit/push 失敗: ${e.message}`);
  }
}