/**
 * 环境检测工具类
 * 用于检测当前运行环境：微信服务号、浏览器、小程序、App等
 */

export interface EnvironmentInfo {
  isWechat: boolean
  isMiniprogram: boolean
  isApp: boolean
  isBrowser: boolean
  userAgent: string
  platform: string
  isAlipayClient: boolean
  isDingTalk: boolean
}

/**
 * 从 UA-CH 或 UA 推断平台，避免使用已弃用的 navigator.platform
 */
function getPlatformFromClient(): string {
  // 优先使用 UA-CH（Chromium 等支持）
  const navAny = navigator as any
  const uaData = navAny && navAny.userAgentData
  const uaDataPlatform = typeof uaData?.platform === 'string' ? uaData.platform : ''

  const platform = uaDataPlatform || inferPlatformFromUserAgent(navigator.userAgent)
  return (platform || 'unknown').toLowerCase()
}

function inferPlatformFromUserAgent(userAgent: string): string {
  const ua = (userAgent || '').toLowerCase()
  if (ua.includes('windows'))
    return 'windows'
  if (ua.includes('mac os x') || ua.includes('macintosh') || ua.includes('mac os'))
    return 'macos'
  if (ua.includes('android'))
    return 'android'
  if (ua.includes('iphone') || ua.includes('ipad') || ua.includes('ipod') || ua.includes('ios'))
    return 'ios'
  if (ua.includes('cros'))
    return 'chrome os'
  if (ua.includes('linux'))
    return 'linux'
  return 'unknown'
}

/**
 * 检测当前运行环境
 */
export function detectEnvironment(): EnvironmentInfo {
  const userAgent = navigator.userAgent.toLowerCase()
  const platform = getPlatformFromClient()

  // 检测微信环境
  const isWechat = /micromessenger/i.test(userAgent)

  // 检测支付宝环境
  const isAlipayClient = /alipayclient/i.test(userAgent)

  // 检测抖音环境
  const isDingTalk = /dingtalk/i.test(userAgent)

  // 检测微信小程序环境
  const isMiniprogram = isWechat && /miniprogram/i.test(userAgent)

  // 检测App环境 - 使用括号明确优先级
  const isApp = (
    /myapp|customapp|nativeapp/.test(userAgent)
    || (Object.prototype.hasOwnProperty.call(window, 'webkit') && !!(window as any).webkit?.messageHandlers)
  )

  // 检测浏览器环境
  const isBrowser = !isWechat && !isApp

  return {
    isWechat,
    isMiniprogram,
    isApp,
    isBrowser,
    userAgent,
    platform,
    isAlipayClient,
    isDingTalk,
  }
}
/**
 * 获取当前场景类型
 */
export function getCurrentScene(): 'wechat' | 'browser' | 'miniprogram' | 'app' | 'unknown' {
  const env = detectEnvironment()

  if (env.isMiniprogram)
    return 'miniprogram'
  if (env.isWechat)
    return 'wechat'
  if (env.isApp)
    return 'app'
  if (env.isBrowser)
    return 'browser'

  return 'unknown'
}

/**
 * 检查是否支持特定功能
 */
export function checkFeatureSupport() {
  const env = detectEnvironment()

  return {
    // 摄像头支持
    camera: 'mediaDevices' in navigator && 'getUserMedia' in navigator.mediaDevices,

    // NFC支持
    nfc: 'NDEFReader' in window || 'nfc' in navigator,

    // 文件系统支持
    fileSystem: 'showOpenFilePicker' in window,

    // 振动支持
    vibration: 'vibrate' in navigator,

    // 地理位置支持
    geolocation: 'geolocation' in navigator,

    // 微信JS-SDK支持
    wechatJSSDK: env.isWechat && typeof window !== 'undefined' && 'WeixinJSBridge' in window,
  }
}