import { readFile } from 'node:fs/promises'
import { build } from 'esbuild'

const zh = JSON.parse(await readFile('src/i18n/locales/zh-CN.json', 'utf8'))
const en = JSON.parse(await readFile('src/i18n/locales/en.json', 'utf8'))

function flattenKeys(value, prefix = '') {
  const keys = []
  for (const [key, child] of Object.entries(value)) {
    const path = prefix ? `${prefix}.${key}` : key
    if (child && typeof child === 'object' && !Array.isArray(child)) {
      keys.push(...flattenKeys(child, path))
    } else {
      keys.push(path)
    }
  }
  return keys.sort()
}

const zhKeys = flattenKeys(zh)
const enKeys = flattenKeys(en)
const missingInEnglish = zhKeys.filter((key) => !enKeys.includes(key))
const missingInChinese = enKeys.filter((key) => !zhKeys.includes(key))
if (missingInEnglish.length || missingInChinese.length) {
  throw new Error([
    missingInEnglish.length ? `Missing in English: ${missingInEnglish.join(', ')}` : '',
    missingInChinese.length ? `Missing in Chinese: ${missingInChinese.join(', ')}` : '',
  ].filter(Boolean).join('\n'))
}

const bundled = await build({
  entryPoints: ['src/i18n/index.ts'],
  bundle: true,
  format: 'esm',
  platform: 'node',
  write: false,
  logLevel: 'silent',
})
const i18nModule = await import(
  `data:text/javascript;base64,${Buffer.from(bundled.outputFiles[0].contents).toString('base64')}`
)

const cases = [
  [null, ['zh-CN'], 'zh-CN'],
  [null, ['zh-Hant-TW'], 'zh-CN'],
  [null, ['en-US'], 'en'],
  [null, ['fr-FR'], 'en'],
  [null, ['ko-KR', 'en-US'], 'en'],
  ['en', ['zh-CN'], 'en'],
  ['zh-CN', ['en-US'], 'zh-CN'],
]
for (const [saved, browserLanguages, expected] of cases) {
  const actual = i18nModule.resolveAppLocale(saved, browserLanguages)
  if (actual !== expected) {
    throw new Error(`Locale resolution failed for ${JSON.stringify(browserLanguages)}: expected ${expected}, got ${actual}`)
  }
}

console.log(`i18n 校验通过：${zhKeys.length} 个消息键，中英语言包一致，自动语言与缓存优先级正确`)