import Joi from 'joi';

export default class ParametersValidate {
  // data to validate, parameters from template, param: 'new', 'change', 'null'(null values are allowed)
  static input (data, parameters, param) {
    let joiObject = {};
    parameters.forEach(parameter => {
      switch (parameter.range.type) {
        case 'number': joiObject[parameter.name] = Joi.number();
          break;
        case 'boolean': joiObject[parameter.name] = Joi.boolean();
          break;
        case 'array': joiObject[parameter.name] = Joi.array();
          break;
        case 'string': joiObject[parameter.name] = Joi.string().max(128);
          break;     //  min or max implicitly define the value to be a number
        default: if (parameter.range.hasOwnProperty('min') || parameter.range.hasOwnProperty('max')) {
          joiObject[parameter.name] = Joi.number();
          }
          else {
            joiObject[parameter.name] = Joi.string().max(128);
          }
      }
      if (parameter.range.hasOwnProperty('min')) {
        joiObject[parameter.name] = joiObject[parameter.name].min(parameter.range.min)
      }
      if (parameter.range.hasOwnProperty('max')) {
        joiObject[parameter.name] = joiObject[parameter.name].max(parameter.range.max)
      }
      if (parameter.range.hasOwnProperty('values')) {
        joiObject[parameter.name] = joiObject[parameter.name].valid(...parameter.range.values);
      }
      if (parameter.range.hasOwnProperty('required') && parameter.range.required) {
        joiObject[parameter.name] = joiObject[parameter.name].required();
      }
      if (param === 'null') {
        joiObject[parameter.name] = joiObject[parameter.name].allow(null)
      }
    });
    return Joi.object(joiObject).validate(data);
  }
}