validation

  validationRules = () => {
    const emailRegex = /^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$/;
    const numRegex = /(0){1}(7|8|9){1}(0|1){1}[2-9]{1}\d{7}$/;
    return {
      firstName: (val) => val.length < 4 ? `First name must be longer than 3 letters!` : '',
      lastName: (field) => field.length < 4 ? `Last name must be longer than 3 letters!` : '',
      secret: (val) => val.length < 6 ? `Password length  must be longer than 5!` : '',
      userEmail: (val) => !emailRegex.test(val) ? "Valid email address is required!" : '',
      phoneNumber: (val) => !numRegex.test(val) ? "Valid phone number is required!" : '',
      userLevel: (val) => !val.length ? "User level is required!" : '',
      permissionLevel: (val) => !val.length ? "Permission level is required!" : '',
    }
  }
  
  isValid = () => {
    const { formData, formatError } = this.state;
    let response = true;
   
    const firstnameErr = this.validationRules('Firstname').firstName(formData.firstName);
    if (firstnameErr) {
      formatError.firstNameError = firstnameErr;
      response = false;
    }
    
    const lastnameErr = this.validationRules('Lastname').lastName(formData.lastName);
    if (lastnameErr) {
      formatError.lastNameError = lastnameErr;
      response = false;
    }

    const emailErr = this.validationRules('Email').userEmail(formData.userEmail)
    if (emailErr) {
      formatError.userEmailError = emailErr;
      response = false;
    }

    if (this.state.formAction === 'Create') {
      const passwordErr = this.validationRules('Password').secret(formData.secret)
      if (passwordErr) {
        formatError.secretError = passwordErr;
        response = false;
      }
    }
    
    const phoneErr = this.validationRules('Phone number').phoneNumber(formData.phoneNumber)
    if (phoneErr) {
      formatError.phoneNumberError =phoneErr;
      response = false;
    }
    
    const userLevelErr = this.validationRules('User level').userLevel(formData.userLevel)
    if (userLevelErr) {
      formatError.userLevelError = userLevelErr;
      response = false;
    }

    const permissionLevelErr = this.validationRules('Permission level').permissionLevel(formData.permissions)
    if (permissionLevelErr){
      formatError.permissionError = permissionLevelErr;
      response = false;
    }
    
    this.setState({ formatError });
    return response;
  }