// 解析UA，判断设备类型
function getDeviceInfo() {
  const ua = navigator.userAgent.toLowerCase();
  const deviceInfo = {
    device_type: 'unknown', // 核心：设备类型（pc/mobile/tablet/wechat_mini/wechat_h5）
    os: 'unknown', // 操作系统（windows/macos/ios/android/harmonyos/unknown）
    browser: 'unknown' // 浏览器（chrome/safari/wechat/edge/firefox/unknown）
  };

  // 第一步：判断操作系统
  if (ua.includes('windows')) {
    deviceInfo.os = 'windows';
  } else if (ua.includes('mac os x') || ua.includes('macintosh')) {
    deviceInfo.os = 'macos';
  } else if (ua.includes('ios') || ua.includes('iphone') || ua.includes('ipad')) {
    deviceInfo.os = 'ios';
  } else if (ua.includes('android')) {
    deviceInfo.os = 'android';
  } else if (ua.includes('harmonyos') || ua.includes('huawei')) { // 鸿蒙
    deviceInfo.os = 'harmonyos';
  }

  // 第二步：判断设备类型（优先级：小程序 > 平板 > 移动端 > PC）
  // 微信小程序
  if (ua.includes('miniprogram') || ua.includes('mini program')) {
    deviceInfo.device_type = 'wechat_mini';
  }
  // 平板（iPad/安卓平板）
  else if (ua.includes('ipad') || (ua.includes('android') && !ua.includes('mobile'))) {
    deviceInfo.device_type = 'tablet';
  }
  // 移动端（手机：iOS/Android）
  else if (ua.includes('mobile') || ua.includes('iphone') || (ua.includes('android') && ua.includes('mobile'))) {
    deviceInfo.device_type = 'mobile';
  }
  // PC端（Windows/Mac）
  else if (ua.includes('windows') || ua.includes('macos') || ua.includes('linux')) {
    deviceInfo.device_type = 'pc';
  }
  // 微信H5（公众号/微信内置浏览器）
  if (ua.includes('micromessenger') && deviceInfo.device_type !== 'wechat_mini') {
    deviceInfo.device_type = 'wechat_h5';
  }

  // 第三步：判断浏览器
  if (ua.includes('chrome')) {
    deviceInfo.browser = 'chrome';
  } else if (ua.includes('safari') && !ua.includes('chrome')) {
    deviceInfo.browser = 'safari';
  } else if (ua.includes('micromessenger')) {
    deviceInfo.browser = 'wechat';
  } else if (ua.includes('edge')) {
    deviceInfo.browser = 'edge';
  } else if (ua.includes('firefox')) {
    deviceInfo.browser = 'firefox';
  }

  return deviceInfo;
}