// ============================================================
// bump-version.mjs — 版本号管理与 CHANGELOG 模板生成
//
// 用法：
//   node build/scripts/bump-version.mjs <major|minor|patch> [--no-changelog]
//   node build/scripts/bump-version.mjs set <x.y.z>
//   node build/scripts/bump-version.mjs pre <beta|alpha>
//
// 示例：
//   node build/scripts/bump-version.mjs patch          # 0.0.28 → 0.0.29
//   node build/scripts/bump-version.mjs minor          # 0.0.28 → 0.1.0
//   node build/scripts/bump-version.mjs set 1.0.0      # 直接设置版本
//   node build/scripts/bump-version.mjs pre beta       # 0.0.29 → 0.0.29-beta.1
// ============================================================

import { readFileSync, writeFileSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = join(__dirname, '..', '..');

const args = process.argv.slice(2);
const command = args[0];
const arg1 = args[1];
const noChangelog = args.includes('--no-changelog');

if (!command) {
  console.error('用法: node build/scripts/bump-version.mjs <major|minor|patch|set|pre> [value]');
  console.error('示例: node build/scripts/bump-version.mjs patch');
  console.error('      node build/scripts/bump-version.mjs set 1.0.0');
  console.error('      node build/scripts/bump-version.mjs pre beta');
  process.exit(1);
}

const pkgPath = join(ROOT, 'package.json');
const pkg = JSON.parse(readFileSync(pkgPath, 'utf-8'));
const oldVersion = pkg.version;

// ---------- 版本计算 ----------

function parseSemver(v) {
  const match = v.match(/^(\d+)\.(\d+)\.(\d+)(?:-(.+))?$/);
  if (!match) throw new Error(`无效的版本号格式: ${v}`);
  return {
    major: parseInt(match[1]),
    minor: parseInt(match[2]),
    patch: parseInt(match[3]),
    pre: match[4] || null,
  };
}

let newVersion;

switch (command) {
  case 'major':
  case 'minor':
  case 'patch': {
    const sv = parseSemver(oldVersion);
    if (command === 'major') {
      sv.major++;
      sv.minor = 0;
      sv.patch = 0;
    } else if (command === 'minor') {
      sv.minor++;
      sv.patch = 0;
    } else {
      sv.patch++;
    }
    sv.pre = null;
    newVersion = `${sv.major}.${sv.minor}.${sv.patch}`;
    break;
  }

  case 'set': {
    if (!arg1) {
      console.error('用法: node build/scripts/bump-version.mjs set <x.y.z>');
      process.exit(1);
    }
    // 基本格式校验
    if (!/^\d+\.\d+\.\d+(-.+)?$/.test(arg1)) {
      console.error(`无效的版本号: ${arg1}`);
      process.exit(1);
    }
    newVersion = arg1;
    break;
  }

  case 'pre': {
    if (!arg1 || !['beta', 'alpha'].includes(arg1)) {
      console.error('用法: node build/scripts/bump-version.mjs pre <beta|alpha>');
      process.exit(1);
    }
    const sv = parseSemver(oldVersion);

    // 如果当前版本已有预发布后缀，递增进位号
    if (sv.pre) {
      const match = sv.pre.match(new RegExp(`^${arg1}\\.(\\d+)$`));
      if (match) {
        const num = parseInt(match[1]) + 1;
        newVersion = `${sv.major}.${sv.minor}.${sv.patch}-${arg1}.${num}`;
      } else {
        // 不同预发布类型，重新开始
        newVersion = `${sv.major}.${sv.minor}.${sv.patch}-${arg1}.1`;
      }
    } else {
      // 纯 semver → 首次预发布：自动升 patch 再加后缀
      sv.patch++;
      newVersion = `${sv.major}.${sv.minor}.${sv.patch}-${arg1}.1`;
    }
    break;
  }

  default:
    console.error(`未知命令: ${command}。支持: major | minor | patch | set <ver> | pre <beta|alpha>`);
    process.exit(1);
}

// ---------- 更新 package.json ----------

pkg.version = newVersion;
writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + '\n', 'utf-8');
console.log(`✅ package.json: ${oldVersion} → ${newVersion}`);

// ---------- 更新 shared/constants/version.ts（由 import pkg 动态读取，无需修改） ----------
console.log('   shared/constants/version.ts 自动读取 package.json，无需手动同步');

// ---------- 更新 CHANGELOG.md ----------

if (!noChangelog) {
  const changelogPath = join(ROOT, 'CHANGELOG.md');
  try {
    let changelog = readFileSync(changelogPath, 'utf-8');

    const today = new Date().toISOString().slice(0, 10);
    const entry = `## ${newVersion}（${today}）\n\n**更新内容待补充**\n\n---\n\n`;

    // 在第一个 ## 之前插入新版本条目
    const firstHeaderMatch = changelog.match(/^##\s/m);
    if (firstHeaderMatch) {
      const insertAt = firstHeaderMatch.index;
      changelog = changelog.slice(0, insertAt) + entry + changelog.slice(insertAt);
      writeFileSync(changelogPath, changelog, 'utf-8');
      console.log(`✅ CHANGELOG.md: 已添加 v${newVersion} 模板条目`);
    } else {
      console.warn('⚠️  CHANGELOG.md 格式异常，未找到 ## 版本标题');
    }
  } catch {
    console.warn('⚠️  CHANGELOG.md 不存在，跳过更新');
  }
}

console.log(`\n版本已更新: ${oldVersion} → ${newVersion}`);