/**
 * 处理扫描的二维码链接
 * @param {string} qrUrl - 扫描到的二维码链接
 * @returns {Object} 解析后的二维码信息
 */
function processQRCode(qrUrl) {
  // 解析URL参数
  const parseUrlParams = (url) => {
    try {
      const query = url.split('?')[1];
      if (!query) return {};
      
      return query.split('&').reduce((params, param) => {
        const [key, value] = param.split('=');
        if (key && value !== undefined) {
          params[key] = decodeURIComponent(value);
        }
        return params;
      }, {});
    } catch (e) {
      console.error('解析二维码链接失败:', e);
      return {};
    }
  };

  // 更新扫码次数（加1）
  const updateScanCount = (params) => {
    if (params.scanCount !== undefined) {
      params.scanCount = parseInt(params.scanCount || '0', 10) + 1;
    }
    return params;
  };

  // 确定来源类型和ID
  const determineSource = (params) => {
    if (params.employeeId) {
      return { type: 'employee', id: params.employeeId };
    } else if (params.ownerId) {
      return { type: 'owner', id: params.ownerId };
    } else if (params.partnerId) {
      return { type: 'partner', id: params.partnerId };
    }
    return { type: 'unknown', id: null };
  };

  // 主处理逻辑
  const params = parseUrlParams(qrUrl);
  if (!params.storeId) {
    throw new Error('无效的二维码：缺少店铺ID');
  }

  // 更新扫码次数
  const updatedParams = updateScanCount(params);
  
  // 确定来源
  const source = determineSource(updatedParams);

  return {
    storeId: updatedParams.storeId,
    sourceType: source.type,
    sourceId: source.id,
    scanCount: updatedParams.scanCount || 1,
    rawParams: updatedParams
  };
}

//加法
function addNum(arg1, arg2) {
  arg1 = arg1 ? arg1 : 0
  arg2 = arg2 ? arg2 : 0
  let r1, r2, m, c;
  try {
    r1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    r2 = 0;
  }
  c = Math.abs(r1 - r2);
  m = Math.pow(10, Math.max(r1, r2));
  if (c > 0) {
    let cm = Math.pow(10, c);
    if (r1 > r2) {
      arg1 = Number(arg1.toString().replace(".", ""));
      arg2 = Number(arg2.toString().replace(".", "")) * cm;
    } else {
      arg1 = Number(arg1.toString().replace(".", "")) * cm;
      arg2 = Number(arg2.toString().replace(".", ""));
    }
  } else {
    arg1 = Number(arg1.toString().replace(".", ""));
    arg2 = Number(arg2.toString().replace(".", ""));
  }
  return (arg1 + arg2) / m;
}

//减法
function subtraction(num1, num2) {
  var r1, r2, m, floatNum;
  try {
    r1 = num1.toString().split(".")[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = num2.toString().split(".")[1].length;
  } catch (e) {
    r2 = 0;
  }
  m = Math.pow(10, Math.max(r1, r2));
  return (num1 * m - num2 * m) / m;
}

//相乘
function multiply(arg1, arg2) {
  arg1 = arg1 ? arg1 : 0
  arg2 = arg2 ? arg2 : 0
  let r1, r2, m, c;
  try {
    r1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    r2 = 0;
  }
  c = Math.abs(r1 - r2);
  m = Math.pow(10, Math.max(r1, r2) * 2);
  if (c > 0) {
    let cm = Math.pow(10, c);
    if (r1 > r2) {
      arg1 = Number(arg1.toString().replace(".", ""));
      arg2 = Number(arg2.toString().replace(".", "")) * cm;
    } else {
      arg1 = Number(arg1.toString().replace(".", "")) * cm;
      arg2 = Number(arg2.toString().replace(".", ""));
    }
  } else {
    arg1 = Number(arg1.toString().replace(".", ""));
    arg2 = Number(arg2.toString().replace(".", ""));
  }
  return (arg1 * arg2) / m;
}

module.exports = {
  processQRCode,
  addNum,
  subtraction,
  multiply
};