/**
 * 品牌色 utility 用量盘点（为「文本令牌 / 底色令牌」拆分提供决策依据）
 *
 * 统计 src 下所有 `(?:变体前缀:)?(属性)-brand(?:-子token)?(/透明度)?` 的出现次数与文件分布。
 * 用法：node scripts/audit/brand-usage-scan.mjs [--files]
 */

import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../..');
const EXTS = new Set(['.tsx', '.ts', '.css', '.jsx', '.js', '.mdx']);
const SKIP = new Set(['node_modules', '.next', '.git', '_archive', 'dist', 'coverage']);

function walk(dir, out = []) {
  for (const e of fs.readdirSync(dir, { withFileTypes: true })) {
    const p = path.join(dir, e.name);
    if (e.isDirectory()) { if (!SKIP.has(e.name)) walk(p, out); }
    else if (EXTS.has(path.extname(e.name))) out.push(p);
  }
  return out;
}

const VARIANTS = '(?:hover:|focus:|focus-visible:|active:|group-hover:|dark:|sm:|md:|lg:|xl:)*';
const PROPS = '(bg|text|border|from|to|via|fill|stroke|ring|divide|decoration|outline|shadow|placeholder|caret|accent)';
const re = new RegExp(`(?:^|[\\s\`"'])${VARIANTS}${PROPS}-(brand(?:-[a-z]+)?)(?:/[0-9]+)?(?=[\\s\`"':/]|$)`, 'g');

const byToken = new Map();
const byFile = new Map();
const byPropToken = new Map();

for (const f of walk(path.join(ROOT, 'src'))) {
  let s;
  try { s = fs.readFileSync(f, 'utf8'); } catch { continue; }
  let m;
  while ((m = re.exec(s))) {
    const key = `${m[1]}-${m[2]}`;
    byToken.set(key, (byToken.get(key) || 0) + 1);
    byPropToken.set(m[1], (byPropToken.get(m[1]) || 0) + 1);
    byFile.set(f, (byFile.get(f) || 0) + 1);
  }
}

const sortDesc = a => [...a.entries()].sort((x, y) => y[1] - x[1]);

console.log('=== brand utility 用量（src 全量）===');
for (const [k, n] of sortDesc(byToken)) console.log(String(n).padStart(5), k);
const total = [...byToken.values()].reduce((s, n) => s + n, 0);
console.log('总计'.padStart(5), total);

console.log('\n=== 按属性聚合 ===');
for (const [k, n] of sortDesc(byPropToken)) console.log(String(n).padStart(5), k);

if (process.argv.includes('--files')) {
  console.log('\n=== 文件分布 Top 25 ===');
  for (const [f, n] of sortDesc(byFile).slice(0, 25)) {
    console.log(String(n).padStart(5), path.relative(ROOT, f));
  }
}