/**
 * 环境检测工具
 * 检测当前运行平台（微信/支付宝/普通浏览器），映射到对应的 app_no
 */

// app_no 编码表：platform + terminalType → app_no
const APP_NO_MAP = {
  'wechat_h5': '60000001102001',
  'wechat_mp': '60000001102101',
  'alipay_h5': '60000001112001',
  'alipay_mp': '60000001112101',
};

/**
 * 检测当前运行环境
 * @returns {'wechat' | 'alipay' | 'browser'}
 */
export function detectPlatform() {
  // #ifdef H5
  const ua = navigator.userAgent;

  if (/MicroMessenger/i.test(ua)) {
    return 'wechat';
  }
  if (/AlipayClient/i.test(ua)) {
    return 'alipay';
  }
  // #endif

  // #ifdef MP-WEIXIN
  return 'wechat';
  // #endif

  // #ifdef MP-ALIPAY
  return 'alipay';
  // #endif

  return 'browser';
}

/**
 * 检测当前终端类型
 * @returns {'h5' | 'mp'}
 */
export function detectTerminalType() {
  // #ifdef H5
  return 'h5';
  // #endif

  // #ifdef MP-WEIXIN || MP-ALIPAY
  return 'mp';
  // #endif

  return 'h5';
}

/**
 * 根据平台和终端类型获取 app_no
 * @param {string} platform - 'wechat' | 'alipay' | 'browser'
 * @param {string} terminalType - 'h5' | 'mp'
 * @returns {string} app_no
 */
export function getAppNo(platform, terminalType = 'h5') {
  if (platform === 'browser') return '';
  return APP_NO_MAP[`${platform}_${terminalType}`] || '';
}

/**
 * 初始化环境检测并缓存到 storage
 * 应在 App.vue onLaunch 中调用
 */
export function initEnv() {
  const platform = detectPlatform();
  const terminalType = detectTerminalType();
  const appNo = getAppNo(platform, terminalType);

  uni.setStorageSync('platform', platform);
  uni.setStorageSync('terminal_type', terminalType);
  if (appNo) {
    uni.setStorageSync('app_no', appNo);
  }

  return { platform, terminalType, appNo };
}