/**
 * bump-version.js — 构建时自动递增 package.json 版本号
 *
 * 逻辑：
 *   检查自上次构建以来的 git commit，若仅包含工程化变更（chore/build/ci/auto bump）或没有新 commit，
 *   则跳过版本号递增，保持当前版本号。
 *   否则按指定类型（默认 patch）递增版本号。
 *
 * 用法: node scripts/bump-version.js [patch|minor|major]
 *       默认 patch，每次 npm run build 前自动执行
 */
const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const pkgPath = path.resolve(__dirname, '..', 'package.json');
const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf-8'));

const rootDir = path.resolve(__dirname, '..');
const lastBuildFile = path.join(rootDir, '.last_build_commit');

// ----- 判断是否有有效变更 -----
let hasMeaningfulChanges = true;

try {
  let fromHash = '';
  try {
    fromHash = fs.readFileSync(lastBuildFile, 'utf-8').trim();
  } catch {
    fromHash = '';
  }

  if (fromHash) {
    const range = `${fromHash}..HEAD`;
    const log = execSync(
      `git log --no-merges --pretty=format:"%s" ${range}`,
      { cwd: rootDir, encoding: 'utf-8' }
    ).trim();

    const commits = log ? log.split('\n').filter(Boolean) : [];

    if (commits.length === 0) {
      hasMeaningfulChanges = false;
      console.log('[bump-version] 没有新 commit，跳过版本号递增');
    } else {
      const allChore = commits.every(msg => {
        const s = msg.toLowerCase().trim();
        return (
          s.startsWith('chore:') ||
          s.startsWith('chore(') ||
          s.startsWith('build:') ||
          s.startsWith('build(') ||
          s.startsWith('ci:') ||
          s.startsWith('ci(') ||
          /auto ?bump/i.test(s) ||
          /工程化/.test(s) ||
          /skip ?ci/i.test(s)
        );
      });

      if (allChore) {
        hasMeaningfulChanges = false;
        console.log(`[bump-version] 仅有工程化变更（${commits.length} 条），跳过版本号递增`);
      } else {
        console.log(`[bump-version] 检测到 ${commits.length} 条提交，其中 ${commits.filter(msg => {
          const s = msg.toLowerCase().trim();
          return !(s.startsWith('chore:') || s.startsWith('chore(') ||
            s.startsWith('build:') || s.startsWith('build(') ||
            s.startsWith('ci:') || s.startsWith('ci(') ||
            /auto ?bump/i.test(s) || /工程化/.test(s) || /skip ?ci/i.test(s));
        }).length} 条有效变更`);
      }
    }
  } else {
    console.log('[bump-version] 首次构建，正常递增版本号');
  }
} catch (e) {
  console.warn(`[bump-version] 检查变更失败（${e.message}），回退到默认递增`);
  hasMeaningfulChanges = true;
}

// ----- 版本号递增 -----
if (!hasMeaningfulChanges) {
  console.log(`[bump-version] 保持版本号 ${pkg.version}`);
  process.exit(0);
}

const current = pkg.version;
const parts = current.split('.').map(Number);
if (parts.length !== 3 || parts.some(isNaN)) {
  console.error(`[bump-version] 无效版本号: ${current}`);
  process.exit(1);
}

const type = process.argv[2] || 'patch';
switch (type) {
  case 'major':
    parts[0] += 1;
    parts[1] = 0;
    parts[2] = 0;
    break;
  case 'minor':
    parts[1] += 1;
    parts[2] = 0;
    break;
  case 'patch':
  default:
    parts[2] += 1;
    break;
}

const next = parts.join('.');
pkg.version = next;
fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + '\n', 'utf-8');

console.log(`[bump-version] ${current} → ${next}`);