/**
 * 统一改产品版本号：各端 package.json + 小程序兜底 + API health + HQ 最低版本占位。
 *
 * 用法：
 *   node scripts/set-version.mjs 4.0.19
 *   node scripts/set-version.mjs v4.0.19
 *   node scripts/set-version.mjs 4.0.19 --dry-run
 *   pnpm set-version -- 4.0.19
 *
 * 不改内部库（packages/domain、shared-types、weixin-sdk、client-logging 仍为 0.1.0）。
 * 加 --include-libs 才会一并改这些库。
 */
import { readFileSync, writeFileSync, readdirSync, statSync } from 'node:fs';
import { dirname, join, relative } from 'node:path';
import { fileURLToPath } from 'node:url';

const root = join(dirname(fileURLToPath(import.meta.url)), '..');
const LIB_PACKAGES = new Set([
  'packages/domain/package.json',
  'packages/shared-types/package.json',
  'packages/weixin-sdk/package.json',
  'packages/client-logging/package.json',
]);

const SOURCE_TARGETS = [
  {
    file: 'apps/mini-user/src/lib/client-version.ts',
    label: '小程序版本兜底',
    pattern: /(\|\| ')(\d+\.\d+\.\d+)(')/,
  },
  {
    file: 'server/dukang-api/src/modules/health/health.controller.ts',
    label: 'API /health version',
    pattern: /(version:\s*')(\d+\.\d+\.\d+)(')/,
  },
  {
    file: 'server/dukang-api/src/common/system-config/system-config.registry.ts',
    label: 'HQ 小程序最低版本占位',
    pattern: /(placeholder:\s*')(\d+\.\d+\.\d+)(')/,
  },
];

function fail(message) {
  console.error(message);
  process.exit(1);
}

function parseArgs(argv) {
  const flags = new Set();
  const rest = [];
  for (const a of argv) {
    if (a === '--dry-run' || a === '-n') flags.add('dryRun');
    else if (a === '--include-libs') flags.add('includeLibs');
    else if (a === '--help' || a === '-h') flags.add('help');
    else if (a.startsWith('-')) {
      fail(`未知参数：${a}\n用法：node scripts/set-version.mjs <version> [--dry-run] [--include-libs]`);
    } else rest.push(a);
  }
  return { flags, versionRaw: rest[0] };
}

function normalizeVersion(raw) {
  const v = String(raw || '').trim().replace(/^v/i, '');
  if (!/^\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?$/.test(v)) {
    fail(`版本号须为 semver，例如 4.0.19 或 v4.0.19，收到：${raw || '(空)'}`);
  }
  return v;
}

function walkPackageJson(dir, out = []) {
  for (const name of readdirSync(dir)) {
    if (name === 'node_modules' || name === 'dist' || name === '.git') continue;
    const full = join(dir, name);
    let st;
    try {
      st = statSync(full);
    } catch {
      continue;
    }
    if (st.isDirectory()) walkPackageJson(full, out);
    else if (name === 'package.json') out.push(full);
  }
  return out;
}

function rel(file) {
  return relative(root, file).replaceAll('\\', '/');
}

function printHelp() {
  console.log(`统一改产品版本号

用法：
  node scripts/set-version.mjs <version> [--dry-run] [--include-libs]
  pnpm set-version -- <version>

示例：
  node scripts/set-version.mjs 4.0.19
  node scripts/set-version.mjs v4.0.19 --dry-run

会改：
  - 各端 / API / shared-ui 的 package.json version
  - 小程序 client-version.ts 兜底
  - API GET /health 的 version
  - HQ「小程序最低版本」placeholder

默认不改内部库 0.1.0（domain / shared-types / weixin-sdk / client-logging）。`);
}

function main() {
  const { flags, versionRaw } = parseArgs(process.argv.slice(2));
  if (flags.has('help') || !versionRaw) {
    printHelp();
    process.exit(versionRaw ? 0 : 1);
  }

  const version = normalizeVersion(versionRaw);
  const dryRun = flags.has('dryRun');
  const includeLibs = flags.has('includeLibs');

  const changes = [];

  for (const file of walkPackageJson(root)) {
    const key = rel(file);
    if (key === 'package.json') continue;
    if (!includeLibs && LIB_PACKAGES.has(key)) continue;

    const raw = readFileSync(file, 'utf8');
    let pkg;
    try {
      pkg = JSON.parse(raw);
    } catch {
      fail(`无法解析 ${key}`);
    }
    if (typeof pkg.version !== 'string') continue;
    if (pkg.version === version) {
      changes.push({ file: key, from: pkg.version, to: version, changed: false });
      continue;
    }
    const next = { ...pkg, version };
    const text = `${JSON.stringify(next, null, 2)}\n`;
    if (!dryRun) writeFileSync(file, text);
    changes.push({ file: key, from: pkg.version, to: version, changed: true });
  }

  for (const target of SOURCE_TARGETS) {
    const file = join(root, target.file);
    const raw = readFileSync(file, 'utf8');
    const match = raw.match(target.pattern);
    if (!match) {
      changes.push({
        file: target.file,
        from: '(未匹配到 semver)',
        to: version,
        changed: false,
        note: target.label,
      });
      continue;
    }
    const from = match[2];
    if (from === version) {
      changes.push({ file: target.file, from, to: version, changed: false, note: target.label });
      continue;
    }
    const next = raw.replace(target.pattern, `$1${version}$3`);
    if (!dryRun) writeFileSync(file, next);
    changes.push({ file: target.file, from, to: version, changed: true, note: target.label });
  }

  const updated = changes.filter((c) => c.changed);
  const skipped = changes.filter((c) => !c.changed);

  console.log(`${dryRun ? '[dry-run] ' : ''}目标版本 ${version}`);
  for (const c of updated) {
    console.log(`  改 ${c.file}${c.note ? ` (${c.note})` : ''}  ${c.from} → ${c.to}`);
  }
  for (const c of skipped) {
    console.log(`  跳过 ${c.file}${c.note ? ` (${c.note})` : ''}  已是 ${c.from}`);
  }
  console.log(updated.length ? `共 ${updated.length} 处将写入。` : '没有需要修改的文件。');
}

main();