export const environmentNames = ['development', 'test', 'production'] as const
export type AppEnvironment = typeof environmentNames[number]

export function resolveEnvironment(value: string | undefined) {
  if (!environmentNames.some((name) => name === value)) {
    throw new Error(`Invalid APP_ENV: ${value ?? '(missing)'}. Use development, test or production.`)
  }
  const name = value as AppEnvironment
  return { name, isProduction: name === 'production', dataSource: 'local' as const }
}

export function readPublicConfig(values: Record<string, string | undefined>) {
  const label = values.TARO_APP_ENV_LABEL?.trim()
  if (!label) throw new Error('TARO_APP_ENV_LABEL is required. Check the selected .env.<mode> file.')
  const debug = values.TARO_APP_ENABLE_DEBUG
  if (debug !== 'true' && debug !== 'false') {
    throw new Error('TARO_APP_ENABLE_DEBUG must be true or false.')
  }
  const apiBaseUrl = values.TARO_APP_API_BASE_URL?.trim() ?? ''
  if (apiBaseUrl) {
    let url: URL
    try { url = new URL(apiBaseUrl) } catch { throw new Error('TARO_APP_API_BASE_URL must be an absolute HTTP(S) URL or empty.') }
    if (!['http:', 'https:'].includes(url.protocol)) throw new Error('TARO_APP_API_BASE_URL must use HTTP(S).')
  }
  return { label, apiBaseUrl, enableDebug: debug === 'true' }
}

export function outputDirectory(platform: string) {
  if (platform !== 'weapp' && platform !== 'h5') throw new Error(`Unsupported platform: ${platform}`)
  return platform === 'weapp' ? 'dist' : 'dist-h5'
}