#!/usr/bin/env node
/**
 * 品牌色/令牌引用完整性审计
 *
 * 检查美化治理过程中容易出现的四类回归（均为真实踩过的坑）：
 *   1) 'BrandColors.xxx' 字符串字面量 —— 字符串不是变量，作为颜色值无效
 *   2) BrandColors.xxx 使用但未 import —— 运行时 ReferenceError / undefined
 *   3) import 落在 </script> 之后 —— 模块作用域外，运行时标识符未定义
 *   4) 从 utils/brand-colors.js 具名导入不存在的导出 —— 值为 undefined
 *
 * 用法: node scripts/audit-brandcolor-integrity.js
 * 退出码: 0 通过 / 1 存在问题
 */
const fs = require('fs')
const path = require('path')

const ROOT = path.resolve(__dirname, '..')
const EXCLUDE_DIRS = new Set(['node_modules', 'dist', 'unpackage', '.git', 'scripts', 'docs', '.tmp_equiv'])
const SKIP_FILES = new Set(['components/mp-html/node/node.vue']) // mp-html 源码保持原样

function walk(dir, out = []) {
  for (const name of fs.readdirSync(dir)) {
    if (EXCLUDE_DIRS.has(name)) continue
    const p = path.join(dir, name)
    const st = fs.statSync(p)
    if (st.isDirectory()) walk(p, out)
    else if (name.endsWith('.vue')) out.push(p)
  }
  return out
}

const bcSrc = fs.readFileSync(path.join(ROOT, 'utils/brand-colors.js'), 'utf8')
const exportsSet = new Set()
for (const m of bcSrc.matchAll(/export\s+const\s+(\w+)/g)) exportsSet.add(m[1])
for (const m of bcSrc.matchAll(/^\s*([A-Za-z_][A-Za-z0-9_]*)\s*:\s*'/gm)) exportsSet.add(m[1])
exportsSet.add('default')

const issues = { stringLiteral: [], missingImport: [], strayImport: [], badNamedImport: [] }

for (const abs of walk(ROOT)) {
  const rel = path.relative(ROOT, abs).split(path.sep).join('/')
  if (SKIP_FILES.has(rel)) continue
  const src = fs.readFileSync(abs, 'utf8')
  const scriptIdx = src.search(/<script/)
  const closeIdx = src.indexOf('</script>')
  const styleIdx = src.search(/<style/)
  const head = scriptIdx === -1 ? src : src.slice(0, scriptIdx)
  const scriptBody = scriptIdx === -1 || closeIdx === -1 ? '' : src.slice(scriptIdx, closeIdx)

  if (/['"]BrandColors\.\w+['"]/.test(src)) issues.stringLiteral.push(rel)

  const usesBrandColors = /\bBrandColors\./.test(scriptBody) || /\bBrandColors\./.test(head)
  const importedBrandColors = /import\s*\{[^}]*\bBrandColors\b[^}]*\}\s*from\s*['"][^'"]*brand-colors/.test(src)
  if (usesBrandColors && !importedBrandColors) issues.missingImport.push(rel)

  if (closeIdx !== -1 && styleIdx > closeIdx) {
    const between = src.slice(closeIdx + 9, styleIdx)
    if (/^\s*import\s/m.test(between)) issues.strayImport.push(rel)
  }

  for (const m of src.matchAll(/import\s*\{([^}]*)\}\s*from\s*['"][^'"]*brand-colors(?:\.js)?['"]/g)) {
    for (const raw of m[1].split(',')) {
      const name = raw.trim()
      if (!name) continue
      if (!exportsSet.has(name)) issues.badNamedImport.push(rel + ' -> ' + name)
    }
  }
}

const labels = {
  stringLiteral: "'BrandColors.xxx' 字符串字面量（颜色值无效）",
  missingImport: 'BrandColors 已使用但未 import',
  strayImport: 'import 落在 </script> 之后',
  badNamedImport: 'brand-colors 具名导入不存在',
}

let failed = 0
for (const [key, list] of Object.entries(issues)) {
  if (list.length) failed += list.length
  console.log(labels[key] + ': ' + list.length)
  list.slice(0, 20).forEach(x => console.log('  - ' + x))
}
console.log(failed === 0 ? 'PASS' : 'FAIL(' + failed + ')')
process.exit(failed === 0 ? 0 : 1)