/**
 * 整理需要加密的字段（删除schema中没有的字段，）
 * Created by zhangsong on 2018/8/6.
 */

export default function f(schemaObj, obj) {
  const fieldsArr = Object.keys(obj); // obj中的全部字段
  const encryptFieldsObj = {};
  // 判断是否全部为0
  const encryptFields = fieldsArr.filter((item) => {
    return obj[item] !== 0;
  });
  if (encryptFields.length === 0) { // 如果没有填,则加密全部
    Object.keys(schemaObj)
      .forEach((item) => {
        if (item === '_id' || item === '__v') {
          return;
        }
        if (schemaObj[item].constructor.name === 'Array') {
          encryptFieldsObj[item] = f(schemaObj[item][0], {});
        } else if (schemaObj[item].constructor.name === 'Object') {
          encryptFieldsObj[item] = f(schemaObj[item], {});
        } else if (schemaObj[item].constructor.name === '‌Schema') {
          encryptFieldsObj[item] = f(schemaObj[item].obj, {});
        } else if (schemaObj[item].constructor.name === 'Function') {
          encryptFieldsObj[item] = 1;
        }
      });
  } else {
    // TODO: 数组处理
    fieldsArr.forEach((item) => {
      if (item === '_id' || item === '__v') {
        return;
      }
      if (!schemaObj[item]) { // 如果为false,跳过
        return;
      }

      /**
       * 如果 obj[item]不等于1,那么说明 schema 中对应的类型是内嵌,或者数组,或者对象
       */
      if (Array.isArray(schemaObj[item])) {
        const schemaField = schemaObj[item][0];
        if (schemaField.constructor.name === 'Function') { // 可能的情况[{type: String}]
          encryptFieldsObj[item] = 1;
        } else if (schemaField.constructor.name === 'Object') {
          encryptFieldsObj[item] = f(schemaField, isNumberOne(obj[item]));
        }
      } else if (schemaObj[item].constructor.name === 'Object') {
        encryptFieldsObj[item] = f(schemaObj[item], isNumberOne(obj[item]));
      } else { // TODO: 这里没有处理内嵌schema
        if (obj[item] === 1) {
          encryptFieldsObj[item] = 1;
        } else {
          encryptFieldsObj[item] = f(obj[item], {});
        }
      }
    });
  }
  return encryptFieldsObj;
}

/**
 * 判断参数是否为1,如果是1则返回空对象,否则返回原值
 * @param item
 * @returns {any}
 */
function isNumberOne(item) {
  let obj = item;
  if (item === 1) {
    obj = {};
  }
  return obj;
}