const app = getApp();

function getLocation() {
  return new Promise((resolve, reject) => {
    const cached = app.globalData.location;
    if (cached) {
      resolve(cached);
      return;
    }

    wx.getLocation({
      type: 'gcj02',
      success: (res) => {
        const loc = { latitude: res.latitude, longitude: res.longitude };
        app.globalData.location = loc;
        resolve(loc);
      },
      fail: (err) => {
        // 常见错误：未授权、隐私协议未同意
        const msg = err.errMsg || '';
        if (msg.indexOf('auth deny') >= 0 || msg.indexOf('authorize') >= 0) {
          wx.showModal({
            title: '需要定位权限',
            content: '请在设置中允许小程序获取位置，或点击右上角手动选择位置',
            confirmText: '去设置',
            success: (res) => {
              if (res.confirm) wx.openSetting();
            }
          });
        }
        reject(new Error('定位失败'));
      }
    });
  });
}

module.exports = { getLocation };