const { loadEnv } = require('vite')

const tencentMapKeyPlaceholder = '__REPLACE_WITH_TENCENT_MAP_WEB_KEY__'
const tencentMapKeyPattern = /^[A-Z0-9]{5}(?:-[A-Z0-9]{5}){4,6}$/i

const isUsableTencentMapKey = (value) => (
  tencentMapKeyPattern.test(value)
  && value !== tencentMapKeyPlaceholder
)

const resolveH5BuildPolicy = ({
  args = [],
  projectRoot,
  environment = process.env,
  loadProductionEnv = (root) => loadEnv('production', root, '')
}) => {
  const flags = new Set(args)
  const requireTencentMapKey = flags.has('--require-tencent-map-key')
  const allowPlaceholder = flags.has('--allow-placeholder')

  if (requireTencentMapKey && allowPlaceholder) {
    throw new Error('H5 build cannot require a Tencent map key and allow its placeholder at the same time.')
  }

  if (!requireTencentMapKey) {
    return {
      allowPlaceholder,
      requireTencentMapKey,
      tencentMapKey: ''
    }
  }

  const productionEnv = loadProductionEnv(projectRoot)
  const tencentMapKey = (
    environment.VITE_TENCENT_MAP_KEY
    || productionEnv.VITE_TENCENT_MAP_KEY
    || ''
  ).trim()

  if (!isUsableTencentMapKey(tencentMapKey)) {
    throw new Error([
      'Production H5 build requires a well-formed non-placeholder VITE_TENCENT_MAP_KEY.',
      'Inject it through CI or an ignored .env.production.local file.'
    ].join(' '))
  }

  return {
    allowPlaceholder,
    requireTencentMapKey,
    tencentMapKey
  }
}

const isTextBuildFile = (filePath) => /\.(?:js|mjs|html|json|css|txt|svg|xml|map)$/i.test(filePath)

module.exports = {
  isTextBuildFile,
  isUsableTencentMapKey,
  resolveH5BuildPolicy,
  tencentMapKeyPlaceholder
}