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

function exec(cmd, cwd) {
  return execSync(cmd, { cwd, stdio: 'pipe' }).toString().trim();
}

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

  try {
    // 設定 git 身份
    exec('git config user.email "ai-review[bot]@gitea"', repoDir);
    exec('git config user.name "AI Review Bot"', repoDir);

    // 切換到來源分支
    exec(`git fetch origin ${PR_HEAD_BRANCH}`, repoDir);
    exec(`git checkout ${PR_HEAD_BRANCH}`, repoDir);

    // 確認 findings.json 存在
    exec(`git add ${FINDINGS_PATH}`, repoDir);

    // 檢查是否有變更
    const status = exec('git status --porcelain', repoDir);
    if (!status) {
      console.log('  findings.json 無變更，跳過 commit');
      return;
    }

    const commitMsg = 'chore: update ai-review findings [skip ci]';
    const commitHash = exec(`git commit -m "${commitMsg}"`, repoDir)
      .match(/\[.+ ([a-f0-9]+)\]/)?.[1] || 'unknown';

    exec(`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}`);
  }
}