using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace Vidly.Models
{
    public class Min18YearsIfAMember : ValidationAttribute
    {

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var customer = (Customer)validationContext.ObjectInstance;
            if (customer.MembershipTypeId == MembershipType.Unknown ||
                customer.MembershipTypeId == MembershipType.PayAsYouGo)
                return ValidationResult.Success;
            if (customer.BirthDate == null)
                return new ValidationResult("Birthdate is required");
            var age = DateTime.Today.Year - customer.BirthDate.Value.Year;
            return (age > 18)
                ? ValidationResult.Success
                : new ValidationResult("Customer should be at least 18 years old to go on a membership.");
        }
    }
}